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p0505 HELP plz!!!!!

 
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Old 11-14-2013, 10:26 PM
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p0505 HELP plz!!!!!

I have a 2001 Honda Prelude SH. I have the dreaded p0505 check engine code. When I first got the code a few months ago i took the car to Honda and paid a lot of money. They changed the Idle Air Control Valve and the problem was solved. A few months later i got the terrifying p0505 code again. I once again went to Honda and paid a lot of money. They told me my throttle body had a bad screw that threw off the timing of the throttle body and i needed a new throttle body. In the mean time they adjusted the idle high and the code and all of its symptoms were gone. I bought a 70MM Skunk2 Alpha Series racing throttle body and had the shop that I bought the part from install the throttle body (and a new throttle body gasket). As they changed the throttle body some antifreeze fell out so they replaced the antifreeze that was lost and rebled the system and reset the idle on the ecu. I had the throttle body changed thinking my nightmare would be over but it turns out it wasn't. Whatever Honda did only masked the problem, it didn't solve it. After the new throttle body was installed, the depressing p0505 code and all of its symptoms returned. The shop checked all my connections related to the ecu, idle air control valve and my throttle body and found nothing wrong. The shop wants me to try to use another ecu but I don't have another ecu and they don't either. I went to pepboys and had the engine smoked out. Nothing out of the ordinary was found. I myself searched for vacuum leaks and found nothing. At this point I don't know what to do and I'm fed up. The last things on my mind that could possibly be causing this problem is the intake manifold gasket, or my ecu cant read the idle level and I need a new ecu. I'm tired of spending a lot of money and I don't want to spend anymore. I'm sure plenty of you guys have had this common problem and solved it. Hopefully someone on this forum can end my nightmare. By the way, I also have the p1457 code evap cannister. I know it has nothing to do with p0505 and its symptoms but I thought I would just put that out there so everyone has enough information about my car to try and help. The symptoms from the p0505 are a high idle, constant up and down idle, and the car jerking while driving. I saw someone on youtube had the same problem as me. I will post the link to his video for you all to take a look at one of the many symptoms this problem causes.

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Old 11-15-2013, 08:48 AM
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Re: p0505 HELP plz!!!!!

Check the FICV it's attached to the throttle bodie, could just need to be cleaned and adjusted. Happened to mine, I followed these exact steps on adjusting the FICV and issue went away

the FINAL idle problem thread!!!!!

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Old 11-15-2013, 09:53 AM
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Re: p0505 HELP plz!!!!!

The skunk2 throttle body doesn't have an FICV.
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Old 11-15-2013, 01:50 PM
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Re: p0505 HELP plz!!!!!

Quote:
Originally Posted by MrAlejandro1218 View Post
The skunk2 throttle body doesn't have an FICV.
that might be the issue then. did you loop the lines to the FICV so there are no leaks?
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Old 11-15-2013, 03:56 PM
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Re: p0505 HELP plz!!!!!

How's that cruise control vacuum line?

Is it plugged to you throttle body?

Get ya a service manual from the diy section and study your vacuum system.
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Old 11-16-2013, 01:01 PM
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Re: p0505 HELP plz!!!!!

Made for television movie.... Any reason why you didn't come to us first?
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Old 11-17-2013, 05:11 AM
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Re: p0505 HELP plz!!!!!

I had major issues with my idle many years ago with my 5th gen and it amazed me how little mechanics actually know about trouble-shooting idle related issues. One mechanic even told me it was "probably time for a new car". Its most likely going to be something simple but you'll have to methodically step through and trouble shoot.

Also one quick question, does this issue happen when the car is cold, warm, or all the time?

Here's some things to note:
- get yourself the Helm's manual and find the chapter that deals with idle adjustment and trouble-shooting, you can find them online, possibly even on this site, it'll tell you how to test your IACV and FITV
- going with an aftermarket throttle body was a bad idea, you're further complicating things if you're not mechanically inclined as you've just made this harder to trouble-shoot, hopefully you held onto your original TB as it's probably fine, but definitely replace the gasket(s) and it wouldn't hurt to clean it while its out, what did they mean it had a "bad screw"??
- you don't set the idle through the ECU, its done by adjusting the screw on the side of the throttle body, you're actually not supposed to adjust this screw to trouble-shoot a bad idle, it should be left at the factory setting, adjusting it would only compensate for an issue elsewhere, you may need to adjust it if its already been tampered with though, after verifying everything else is fine
- your old IACV was probably fine if replacing it with the new one didn't solve the issue, I hope you held onto it because that's an expensive ass part
- you should search for the FITV (fast idle valve) fix, the FITV is responsible for your car's idle while it's cold, HOWEVER, there is a common issue with them which can lead to a vacuum leak (white plastic screw inside becomes loose) forcing a high idle while warm
- you'll definitely want to check for vacuum leaks again, a high idle most likely means there is a vacuum leak somewhere, my guess is probably the FITV is the source

Good luck!

Last edited by flyingv; 11-17-2013 at 05:14 AM.
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Old 11-17-2013, 12:22 PM
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Re: p0505 HELP plz!!!!!

The FITV connections seem fine. Here are some pics of my throttle body, cold air intake and intake manifold connections.
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Old 11-17-2013, 12:40 PM
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Re: p0505 HELP plz!!!!!

The FITV connections seem fine. Here are some pics of my throttle body, cold air intake and intake manifold connections.
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Old 11-17-2013, 12:53 PM
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Re: p0505 HELP plz!!!!!

FlyingV, the issue occurs when the car warms up just like in the youtube video. I did hold on to my original throttle body but I don't think getting an aftermarket throttle body made things more complex. I went with the skunk2 throttle body for the extra 5mm of air and the extra horse power. I know I'm not the only person in the world with a sexy aftermarket throttle body. When I had Honda diagnose the car, I was told the throttle body had "a bad screw" and that made the throttle body unbalanced so I needed a new one. They said a screw was broken. The skunk2 throttle body idle screw has NOT been tampered with. Only the original throttle body screw was tampered with by Honda. They raised the idle on that throttle body. No I don't have the old IACV. The FITV connections seem fine.
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Old 11-17-2013, 01:01 PM
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Re: p0505 HELP plz!!!!!

Here are some pics of my old throttle body (if this helps at all)
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Old 11-18-2013, 08:34 AM
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Re: p0505 HELP plz!!!!!

I don't know what the differences are between the skunk2 and oem throttle body. I've had lots of bad experiences with aftermarket parts that are seemingly no different and just stopped using them for significant parts as it usually complicates my trouble-shooting when things head south. If there is no major difference than you should be able to use the Helm's manual to trouble shoot, assuming it follows the same configuration. Using the manual and understanding how everything works is the best place to start, otherwise you are shooting in the dark.

The FITV issue I'm referring to doesn't have to do with the outer connections, it has to do with a part located inside that you have to open up to get to and readjust. But this issue usually pertains to the car's idle before reaching normal operating temp.

You said the issue happens when the car is warming up, meaning on a cold start while it's trying to reach normal operating temperature? Does it go away later after the car has reached normal operating temperature? Or always persist?

I would also suspect something up with the ECU's connections but you've stated that those have been checked. Do you know anyone else with a 5th gen that could meet up with you to swap parts/test? Where are you located? Our cars are pretty old, you should check with local parts yards to see if there are any 5th gens.

Last edited by flyingv; 11-18-2013 at 08:39 AM.
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Old 11-18-2013, 12:46 PM
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Re: p0505 HELP plz!!!!!

FlyingV, my problem is AFTER the car warms up, NOT on a cold start. In the morning when i start the car its fine. As i keep driving the idle starts jumping up and down at red lights. Then eventually when the car is warm it reacts the way the car in the youtube video reacts. If i restart the car it goes away TEMPORARILY but eventually comes right back minutes later. Unfortunately, everyone I know either has a Civic or an Accord. My Accord friends swapped to H22's tho. I tried my friends Accord IACV and nothing changed so I know for a fact the IACV is fine (just in case Honda gave me a brand new defective IACV). Unfortunately I can't try any of their ECU's because they have OBD1 ECU's. I need a step-down harness to try using their ECU's. The shop won't let me try troubleshooting with the step-down harness they sell without buying it. I don't want to buy it cause if I buy it and try my friends OBD1 ECU and find out my ECU isn't the problem, they will not give me back my money.
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Old 11-19-2013, 01:29 AM
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Re: p0505 HELP plz!!!!!

Quote:
Originally Posted by MrAlejandro1218 View Post
FlyingV, the issue occurs when the car warms up just like in the youtube video. I did hold on to my original throttle body but I don't think getting an aftermarket throttle body made things more complex. I went with the skunk2 throttle body for the extra 5mm of air and the extra horse power. I know I'm not the only person in the world with a sexy aftermarket throttle body. When I had Honda diagnose the car, I was told the throttle body had "a bad screw" and that made the throttle body unbalanced so I needed a new one. They said a screw was broken. The skunk2 throttle body idle screw has NOT been tampered with. Only the original throttle body screw was tampered with by Honda. They raised the idle on that throttle body. No I don't have the old IACV. The FITV connections seem fine.
Without port matching the intake manifold to the 70MM throttle body, you did absolutely nothing to gain extra HP.
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Old 11-22-2013, 01:13 AM
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Re: p0505 HELP plz!!!!!

Today i noticed i had 2 new engine codes. P01508 (basically same as p0505 I think, idle air control valve) and P0108 map sensor. Could the map sensor be the cause of all my problems? Has my map sensor gone defective on me?
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Old 11-25-2013, 11:41 PM
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Re: p0505 HELP plz!!!!!

My map sensor isn't bad. The map sensor code only came up because I disconnected it while the car was running. Unfortunately I still have the p0505 code and I'm still dealing with an erratic idle after warm up. I've been searching for information on other people who have the Skunk2 throttle body with no FITV to see if they had a similar problem but haven't found much. My FITV bypass seems fine, but I'm no expert. I'm guessing my issue could be my ECU, incorrect FITV bypass, or wrong adjusted idle level (on the throttle body).
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Old 01-02-2014, 01:23 AM
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Re: p0505 HELP plz!!!!!

I bought a step down harness and switched ECU's to test if my ECU was the problem. My friend let me barrow his P13. The check engine code comes on sometimes but not every time I drive the car. At times I still have a surging idle. The problem is a lot better, but still persist. Now I'm completely lost. I don't know where to go from here. I've basically tried everything :-(.
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Old 01-06-2014, 06:19 AM
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Re: p0505 HELP plz!!!!!

From the research I did it doesn't seem like the Skunk2 throttle-body is a straight swap for the OEM at all. There are workarounds that have to be done such as adjusting the TPS. If you don't get it installed properly then you will most likely have issues. Check out this video:

If you read the comments in that video, people seem to have issues similar to what you're describing. I'm not sure you've accepted the fact that going with aftermarket parts can complicate things. Whoever did the install may have gotten it done, but it may not have been done right. Lots of techs will get things installed and just send you on your way.

This is why I encourage you to try to revert back to a stock setup so that you can effectively trouble-shoot the issue using the Helm's manual. OR you have to find a tech who actually know what they're doing, but that isn't easy.

I'm actually very surprised that the Honda dealership would install a Skunk2 throttle-body on your car. They're hesitant to even work on cars that have aftermarket air intakes. You should go back to them and make them figure out what is wrong, you paid them to solve this problem. If they have to, they should purchase and install an OEM throttle-body for you if they can't get the Skunk2 working right.

**I would also double-check the connections to your ECU.

Last edited by flyingv; 01-06-2014 at 06:22 AM.
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Old 01-06-2014, 11:42 AM
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Re: p0505 HELP plz!!!!!

Hi I'm new and have a similar problem but I cant read some threads until I make a comment, thought this would be a good one to do so. My car wont idle but it is totally fine when applying a little bit of gas (consistently). The second I release the gas pedal it drops down and stalls as if not getting gas (even when I'm on neutral), it will struggle to keep going though. The other problem is if i do end up driving, if my revs get too high it starts sounding like it it REALLY trying and getting flooded. Any advice?
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Old 01-06-2014, 12:23 PM
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Re: p0505 HELP plz!!!!!

At victorious:
Check engine light on?
Could be a number of things.

Most do their first post in the new member section. But, your cherry is popped, so here we go.
You stock or modified?

Go to diy and get ya a service manual. Check troubleshoot stuff and if it's not a help, tell us more.
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Old 01-07-2014, 12:56 AM
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Re: p0505 HELP plz!!!!!

just a stock se 2001 prelude. yes the check engine light is on and when i start or try driving it starts to blink when it gets to that "struggling" point. the troubleshooting advice didnt help. from what ive been seeing it could be the fuel injection, fuel pump, or fuel filter?
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Old 01-07-2014, 02:45 AM
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Re: p0505 HELP plz!!!!!

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Originally Posted by VictoriousEsco View Post
just a stock se 2001 prelude. yes the check engine light is on and when i start or try driving it starts to blink when it gets to that "struggling" point. the troubleshooting advice didnt help. from what ive been seeing it could be the fuel injection, fuel pump, or fuel filter?
Find out what the CEL code is and go from there, they're meant to help with the trouble-shooting process. Some auto parts stores will scan your car for free (autozone).
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Old 01-07-2014, 06:48 PM
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Re: p0505 HELP plz!!!!!

i dont think i can make it to a shop since the second you go on idle it will shut down. any way i can do it without going to a shop?
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Old 01-07-2014, 07:29 PM
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Re: p0505 HELP plz!!!!!

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Originally Posted by VictoriousEsco View Post
i dont think i can make it to a shop since the second you go on idle it will shut down. any way i can do it without going to a shop?
Oh wow its that bad?? My guess would be a bad IACV itself although I've rarely seen them go bad or a bad O2 sensor.

Yup there is thankfully a way to get the code manually: How-to: Retrieve CEL, ATTS, ABS and 4WS DTC's - Honda-Tech

Last edited by flyingv; 01-07-2014 at 07:36 PM.
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Old 01-07-2014, 09:20 PM
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Re: p0505 HELP plz!!!!!

When the cel flashes at ya... not good.

It flashes to say 'hey, fix me now or I could die from this'.
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I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

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Old 01-09-2014, 02:31 AM
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Re: p0505 HELP plz!!!!!

i dont want my baby to die D:
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Old 02-03-2014, 07:52 AM
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Re: p0505 HELP plz!!!!!

Fellas fellas FELLAS! After months and MONTHS of dealing w/ the dreaded erratic idle, my problems are SOLVED... If you havent been following, read all my previous post and u will c where i am now... You guys wont believe what was causing the p0505 CEL... I only had 2 out of 4 screws attached to my skunk2 throttle body -___-... Smfh... I've screwed in all 4 screws now & no more surging idle or p0505 CEL :-)... I did however get a blinking CEL b4 i found out my TB wasn't fully screwed in... Cylinder 2 fuel injector is going bad :-(... After changing, i should b good to go :-)... Check out my youtube show where i rant a rave about sports, cars, video games & fitness... In this ep, i go over some of my car parts... Thanks 4 EVERYONE's hlp... I highly appreciate it... Now IM gunna go Idle in peace :-D

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Old 02-05-2014, 09:07 PM
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Re: p0505 HELP plz!!!!!

I knew something was up with that Skunk2 throttle-body, even suggested it may have been installed improperly - but I never would have guessed it wasn't screwed in!

Glad to hear you've made progress on this. I love when people follow through on their issues after gaining resolution. It adds a lot of value to the thread.
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Old 02-05-2014, 10:51 PM
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Re: p0505 HELP plz!!!!!

Yes you guessed rite flyingV... The shop only screwed the 2 screws on the bottom and forgot the 2 screws on the top... Thk u vry much 4 the hlp!
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Old 12-14-2016, 11:49 AM
MY FIRST POST YEAH!
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blue_myriddn is on a distinguished road
Re: p0505 HELP plz!!!!!

stumbled across this as I have the same engine code. Thanks to all who have replied.
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