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H22A4 1999 Prelude - Engine Trouble

 
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Old 09-28-2010, 12:21 AM
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Icon5 H22A4 1999 Prelude - Engine Trouble

This last week I have been goggling and reading on Honda tech about the mysterious random misfire code that I have, I am still stuck on it and now am requesting advice.

Info on car:
Oil - Mobile 1 10W30 High Mileage (used since bought car at 109,000)
Oil is changed every 3000 miles
Gas - (Chevron premium 91 since bought car)
Current Mileage - 170,000
No previous problems except minor oil coming from timing and trans side of engine.

Recently rebuilt power steering pump and replaced all fluids in vehicle.

What I've Done/Replaced:
Roter
Cap
Plugs
Wiresets
Octane booster (I usually use 91 but ever since I filled up at a Chevron I don't normally go to this has been my nightmare)

Tested:
Fuel pressure test (was 7-10psi higher then service manual states)
Compression test all cylinders (WOT & fuses removed - all ranged from 235-240)
Tested EGR valve solenoid (service manual says to replace - ohm is not in specs)
Tested almost all lines for EGR system - everything passed except valve above
Ignition coil tested (out of specs according to service manual - ohms too low @ a&c terminals)

I plan on checking my valve clearance tonight or tomorrow. Any suggestions on what else I should check? I don't want to pay $300 for a new EGR, Coil, etc if these aren't actually the culprits.


September 27, 2010:
I finished the valve clearance, took me 2 freaking hours with only a bent wrench I could find.

A few where off but other then that they were ok. When I started the car it did sound better however it still throws a random misfire code when I am idling. While driving i have not received a code since the valve adjustment.

While in the engine I noticed my timing belt can move left to right with my bare hands, shouldn't it be taught?

I went to auto zone after the valve adjustment and an employee said to use syefoam in the gas and vacuum lines, well i tried it in front of the store and a huge cloud of smoke eventually came spewing out of the tail pipe. Still getting the code at idle though.

Also checked the coil with a new one and for some reason terminals A & C never have continuity like the service manual states, even on the new one!

Employee at autozone says my spark-plug wires shouldn't touch at all, but they've always touched because there is no room to space them out!

Come on guys...where are all the responses honda-tech has failed me so far...
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Old 09-28-2010, 08:39 AM
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Re: H22A4 1999 Prelude - Engine Trouble

plugwires are ok to be touching, just make sure they're not arcing off of each other. pull your plugs and look at the coloring on them, you might be running a little too lean or rich. which code are you pulling, what's the number?
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Old 09-28-2010, 11:51 AM
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Re: H22A4 1999 Prelude - Engine Trouble

Code P1399 - Random Mulitple Misfire

Plugs look weird even being new but I think it's because of the misfire problem. They are orangish in the middle where the electrode is and brown/black on the me grounding part.
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Old 09-28-2010, 12:27 PM
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Re: H22A4 1999 Prelude - Engine Trouble

Clean your EGR and ports. Maybe then you don't need to replace it. While its out you can test and see if its working properly. Also get a new FPR, since the fuel pressure is too high. They're about $65 I think.

Idk, thats what I'd start with.


EDIT- If ohms are out of spec and it says to replace when its out of spec, do so. Especially for the ignition coil, its its not working properly that'll give you a misfire. Once you get all that replaced and its fixed, replace your plugs.
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Old 09-28-2010, 03:22 PM
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Re: H22A4 1999 Prelude - Engine Trouble

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Originally Posted by havikprelude View Post
Clean your EGR and ports. Maybe then you don't need to replace it. While its out you can test and see if its working properly. Also get a new FPR, since the fuel pressure is too high. They're about $65 I think.

Idk, thats what I'd start with.


EDIT- If ohms are out of spec and it says to replace when its out of spec, do so. Especially for the ignition coil, its its not working properly that'll give you a misfire. Once you get all that replaced and its fixed, replace your plugs.
My coils ohms matched a brand new coils, I even when as far as putting the new coil on and it still misfired. I will try removing the EGR, cleaning it and re-testing ohms. While it's off is there any other test I should perform?

With the fuel pressure regulator should I order OEM or does it not matter?
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Old 09-28-2010, 03:59 PM
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Re: H22A4 1999 Prelude - Engine Trouble

i dont think that regulator is your problem. your plugs arent all black sooted up so i doubt its running too rich.

which one of these does your plugs look like? NGK Spark Plugs USA
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Old 09-28-2010, 05:03 PM
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Re: H22A4 1999 Prelude - Engine Trouble

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Originally Posted by 1BadBB6 View Post
i dont think that regulator is your problem. your plugs arent all black sooted up so i doubt its running too rich.

which one of these does your plugs look like? NGK Spark Plugs USA
Plugs resemble "Lead Fouling" however they are not NGK anymore. When I started diagnosing the problem i took my old ones out and put in 2 Prong Boash ones. Unfortunately I do not remember what the NGKs looked when I pulled them, I think they were normal with gray haze on the ground. Maybe that octane booster had lead in the formula...
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Last edited by dr2day; 09-28-2010 at 05:06 PM.
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Old 09-28-2010, 07:29 PM
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Re: H22A4 1999 Prelude - Engine Trouble

I would never run any of that octane booster crap in my car. There is no 93 octane up by you?
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Old 09-28-2010, 10:26 PM
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Re: H22A4 1999 Prelude - Engine Trouble

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Originally Posted by Vipers4Life View Post
I would never run any of that octane booster crap in my car. There is no 93 octane up by you?
I have NEVER used that crap but thought I got some bad gas and thought it would help. What sucks the most, was I did it on a full tank so I have to either pump the gas out now or use it up...

There is some racing fuel a few miles away but highest octane around here is 91.

I'm going to try pulling the EGR off to clean it, any suggestions on what to use to clean it, once its off do I just do the ohm test or are there others I can perform?

Last edited by dr2day; 09-28-2010 at 10:29 PM.
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Old 09-29-2010, 02:14 AM
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Re: H22A4 1999 Prelude - Engine Trouble

Took her on an hr drive to get rid of possible contaminated fuel. Didn't throw a code at all until I got home and let it idle down. I let her idle for about 5 mins and here is the information.

Freeze Frame Data:
DTC for which Freeze Frame was Stored P0302
Fuel System 1 Status Closed Loop
Fuel System 2 Status Not Supported
Calculated LOAD Value 34.12 %
Engine Coolant Temp 208.40 F
Short Term Fuel Trim - Bank 1 -21.88 %
Long Term Fuel Trim - Bank 1 -2.34 %
Intake Manifold Absolute Pressure 10.36 inHg
Engine RPM 686.25 rpm
Vehicle Speed Sensor 0.00 mph
Intake Air Temperature 127.40 F
Absolute Throttle Position 9.80 %

Monitors Running:
Misfire Monitor Complete
Fuel System Monitor Complete
CCM Monitor Complete
Catalyst Monitor Not Complete
Heated Catalyst Monitor Not Supported
EVAP Monitor Not Complete
O2 Sensor Monitor Not Complete
O2 Sensor Heater Monitor Complete
EGR Monitor Complete

Codes Thrown - In order detected
P0302 - Cylinder 2 Misfire
P0301 - Cylinder 1 Misfire
P0300 - Random Misfire
P1399 - Random/Multiple Misfire

Looks like Cylinders 1 & 2 are misfiring again if I let it idle long enough. Whats your thoughts guys?

Last edited by dr2day; 09-29-2010 at 02:45 AM.
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Old 10-02-2010, 11:24 PM
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Re: H22A4 1999 Prelude - Engine Trouble

No more misfire after cleaning the egr ports. They were pretty dirty too, pictures attached.

Now she sounds really quiet and seems to run pretty good, except now I am throwing codes P0740 & P0700 for the tranny.
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Old 10-02-2010, 11:35 PM
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Re: H22A4 1999 Prelude - Engine Trouble

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Originally Posted by dr2day View Post
My coils ohms matched a brand new coils, I even when as far as putting the new coil on and it still misfired. I will try removing the EGR, cleaning it and re-testing ohms. While it's off is there any other test I should perform?

With the fuel pressure regulator should I order OEM or does it not matter?
ONe test you can do is unplug the EGR valve the electrical wires if the misfire clears then its the EGR valve, is not then keep looking. I just did a seafoam treatment to the intake and it cleared my misfire code.
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Old 10-02-2010, 11:43 PM
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Re: H22A4 1999 Prelude - Engine Trouble

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Originally Posted by Rob View Post
ONe test you can do is unplug the EGR valve the electrical wires if the misfire clears then its the EGR valve, is not then keep looking. I just did a seafoam treatment to the intake and it cleared my misfire code.
Yea that seafoam is some interesting stuff. the misfire was solved. but new codes came up for the tranny.
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Old 10-26-2010, 01:41 AM
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Re: H22A4 1999 Prelude - Engine Trouble

I am too experiencing random misfires in all 4 cyclinders.
I have been diagnosing the problem, and have learned some interesting facts.

-If you have an aftermarket air intake, the vacuum hoses may not be installed correctly and/or the ECU is not getting it's desired, predetermined amount of air, causing it to misfire.
I haven't solved my engine light misfire issue yet, but feel it is not critical and do plan to get it 100% soon. More to come.
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Old 10-26-2010, 02:16 AM
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Re: H22A4 1999 Prelude - Engine Trouble

Mine was cleared up by cleaning the EGR & EGR ports...

Also did a valve adjustment to be on the safe side.
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Old 10-26-2010, 11:16 AM
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Re: H22A4 1999 Prelude - Engine Trouble

I was also getting Cyl. 1 & 2 random misfire codes, so i am in the process of overhauling my intake manifold. when i pulled the ports, there was MASSIVE amounts of carb build-up... i found that (only if you actually have the manifold OFF the car) DOllar General brand $1.50 Oven Cleaner does a SPECTACULAR job of cleaning the ports and passages out. Eats that carbon RIGHT UP.
Now that the EGR port cleaning is done, since i have the manifold off the car, I'm painting it Gunmetal for a nice custom look...
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