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Old 03-12-2010, 08:36 PM
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Need an expert! will pay

i've got a 97 prelude with a jdm h22a swap. ok so ive been having misfire codes on every cylinder usually when the car is in open loop in the morning or when cold. thought it was an ignition related problem so i swapped the ignition coil and the coil wire, blah blah.

after looking further into it at work, i hooked up a scanner to it. at idle, my short term fuel trim starts to increase from 0 to about 46%. i figure this may be related to the misfire codes i get, which throw a CEL and do not allow me to pass inspection. if i hit the throttle, the trim goes down to a low number again, but it keeps rising at idle. the funny thing is, that both sensors show the same reading, which leads me to believe it's not a faulty 02, shows more like the symptoms of a MASSIVE vacuum leak. yet my long term fuel trim stays at 0. if i try to unplug the upstream o2, all the fuel trims go to 0. by the way, i have no catalytic converter, ive got a straight pipe with a spark plug de-fouler on the post cat. o2.

i had originally done the coolant bypass on the fast idle valve, but i blocked off the ports properly soo that can't be giving me a vacuum leak. swapped out my IAC, checked for vacuum leaks, and nothing.

i do have a walboro 255 fuel pump that the original owner had put in because of the turbo setup it used to have. the motor is back to stock now with stock injectors, stock fuel rail and regulator. when i pull the hose off the fuel pressure regulator, nothing happens, is this normal? is anyone running the same pump with a stock injector and no problems?

i'm truly stumped and have run out of ideas.... any help would be greatly appreciated! if someone can figure this out i will send them a payment through paypal to show my gratitude.
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Old 03-12-2010, 08:41 PM
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Re: Need an expert! will pay

No clue if this is related to your problem. But i was getting lots of misfire codes for a while. I had my valves adjusted and it fixed it all. No misfire or any CEL since then. Good luck on your problem.
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Old 03-13-2010, 12:19 AM
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Re: Need an expert! will pay

what codes exaxctly are you getting?
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Old 03-14-2010, 06:10 PM
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Re: Need an expert! will pay

Did you do a pressure test on each cylinder? Also how consistent is this issue. if you clear the code does it come back immediately? It sounds like your head
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Old 03-14-2010, 07:07 PM
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Re: Need an expert! will pay

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Did you do a pressure test on each cylinder? Also how consistent is this issue. if you clear the code does it come back immediately? It sounds like your head
huh?
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Old 03-14-2010, 10:08 PM
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Re: Need an expert! will pay

how does a bad head give me a high fuel trim?

and the car idles and runs fine except for those damn codes. throws

p0301
p0302
p0303
p0304
p1399
p1300

and i believe i had a pending p0170
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Old 03-14-2010, 10:21 PM
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Re: Need an expert! will pay

hmmm... everything except the last 3... 1399 1300 and 0170 i know and the manual gives description to diagnose. all the 300s are misfire codes....if your getting it on all cylinders.... then your icm is going bad. your cap and rotor are shot. or the h23 distributor is wired incorrectly.
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Old 03-14-2010, 10:25 PM
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Re: Need an expert! will pay

the 4 colored wires that went to the oil pump match your writeup perfectly. the only difference were i think 3 wires that were the original distributor wires on the remanufactured dist. i wired
black- white
yellow green- yellow green
yellow- orange
green- green

car runs fine just throws these damn codes. going to try and swap my ICM tomorrow and see if it fixes anything.

also, i am having a high short term fuel problem that i can't diagnose for the life of me. dont see any vacuum leaks anywhere and the car just keeps dumping fuel. thinking it may be related to the misfires but not sure. what a nightmare!
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Old 03-14-2010, 10:42 PM
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Re: Need an expert! will pay

You tried comparing the fuel trim to another car?
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Old 03-14-2010, 10:45 PM
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Re: Need an expert! will pay

i don't have another prelude to compare it to.

every car i have ever seen the fuel trim stays around 0. anything over 10 there's a problem. mine climbs to 46
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Old 03-14-2010, 11:12 PM
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Re: Need an expert! will pay

Can't be this simple but, any chance the O2 sensor is so far off the car is dumping fuel and causing it to miss? Will it flood out? Smell like gas? Does it do this when the car is hot or just when you first start it. Do you have a wideband?
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Old 03-14-2010, 11:16 PM
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Re: Need an expert! will pay

well, i would suspect a bad o2 if BOTH o2's werent reading the same percentage on the scanner. doesnt flood out, does smell a lot out of the tailpipe, but then again i have no CAT, i have no idea if it's throwing codes when it's hot or cold because i cant feel it miss. when i check the freeze frame data on the scanner it tells me the fuel system is in open loop. nope no wideband
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Old 03-15-2010, 06:25 AM
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Re: Need an expert! will pay

I had all those codes except the 1300 or the 0170 and valve clerances fixed it. My mechanic said 1399 is caused by bad clerances or bad egr ports/valve.
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Old 03-16-2010, 02:07 AM
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Re: Need an expert! will pay

I had a pretty bad miss issue when I got my lude a couple of months ago. Changed plugs, wires, cap, rotor, and ignitor. Car was (and still does) run pretty rich. The bulk to my DTC's were at the sub 1000rpm range.

Fuel and spark were good so I started to look into air. My EGR had about 27lbs of **** in it. 1 can of brake cleaner was all it took to fix my missfire issue. If I remember right the P0170 was taken care of by this as well.

Good luck.
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Old 03-16-2010, 06:08 AM
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Re: Need an expert! will pay

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I had a pretty bad miss issue when I got my lude a couple of months ago. Changed plugs, wires, cap, rotor, and ignitor. Car was (and still does) run pretty rich. The bulk to my DTC's were at the sub 1000rpm range.

Fuel and spark were good so I started to look into air. My EGR had about 27lbs of **** in it. 1 can of brake cleaner was all it took to fix my missfire issue. If I remember right the P0170 was taken care of by this as well.

Good luck.
yea i cleaned my egr valve in the search for my misfire problem. i replaced plugs wires and dizzy cap before i cleaned it. then i finally did the valves
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Old 03-16-2010, 06:22 PM
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Re: Need an expert! will pay

these problems sounded just like my friends 01 sh, he did same thing changed everything OEM cost him $3000k didnt work. finally did a pressure test and saw that one cylinder was off and had the head rebuilt and problems are all gone.

EGR ports should be cleaned also, my friends ports were cleaned, and everything you can think of
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Old 03-16-2010, 08:13 PM
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Re: Need an expert! will pay

Exhaust leak at all possible? Making the 02s think the car is lean?
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Old 03-16-2010, 10:58 PM
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Re: Need an expert! will pay

i skimmed through this so im not 100% sure if you replaced your 02-sensor but that could be your possibility bang 1 and/or bang 2 my friends having the same issues on his gsr and he has no vtec and it feel like he has no powerband its an obd2 just like you but i believe his distributor is misfireing along with his 02-sensor going bad giving flase readings bc he goes through gas like a track v8 man its terriable but if he fixs the problem ill let ya know what his was until then its still a mstery to him/me as well let me know if you figure it out also. thanks
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Old 03-17-2010, 08:24 AM
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Re: Need an expert! will pay

i replaced my distributor yesterday, crossing my fingers. what makes no sense to me is that both sensor 1 and 2 read the same fuel trim, even though the second o2 is in a spark plug defoule
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Old 03-17-2010, 06:54 PM
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Re: Need an expert! will pay

he replaced his distributor today the misfires are gone and hes still running very rich so hes converting to obd1 he already converted the distributor to obd1 then hes getting an obd1 ecu now and hes already got the harness for it just needs the ecu bc all obd1's use are 1 o2-sensor (his ecu was messing up everys so often it would go in limp mode and the rev limit would set in a 5k and we put another ecu in and never did it, so hes getting the obd1 conversion, ecu, and o2-sensor in by monday ill let you know what happens
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Old 03-19-2010, 06:36 PM
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Re: Need an expert! will pay

i replaced the distributor and it looks like the misfire codes are gone.

now im getting a p0171 code for system too lean. i have yet to figure this problem out
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Old 03-20-2010, 01:41 AM
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Re: Need an expert! will pay

what all aftermarket do you have done to your lude? i know i saw jdm h22a, walbro fuel pump, but what all else do you have? gonna guess its probably running obd1?
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Old 03-20-2010, 01:49 AM
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Re: Need an expert! will pay

nope, obd2... it's pretty much stock except for 2.5 custom exhaust with no cat, ebay header, and a custom CAI

starting to think maybe its something to do with the TPS or MAP, but im not getting any codes for them. going to have to look up the wiring schematics and go through everything. the guy that had the car before me hacked some wiring, think ive got it all sorted out back to normal though.... i'm pretty stumped, never seen a short term fuel trim reach 46%!
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Old 03-20-2010, 02:09 AM
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Re: Need an expert! will pay

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nope, obd2... it's pretty much stock except for 2.5 custom exhaust with no cat, ebay header, and a custom CAI

starting to think maybe its something to do with the TPS or MAP, but im not getting any codes for them. going to have to look up the wiring schematics and go through everything. the guy that had the car before me hacked some wiring, think ive got it all sorted out back to normal though.... i'm pretty stumped, never seen a short term fuel trim reach 46%!
really? are fuckin serious your not running a cat, and your confused why you have a cel..

ya if you really dont want to run a cat(pointless, unless your boosted and racing the car), switch to obd1 and have it tuned, other wise your gonna have to put a cat back on the car to get rid of the cel
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Old 03-20-2010, 01:49 PM
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Re: Need an expert! will pay

alright, first of all no need to curse.

second of all, if that was the problem, it would throw a p0420 code for catalyst efficiency. the computer reads the emissions post CAT and compares it to the pre CAT o2 to determine how well the CAT is working, in case you didn't know.

i on the other hand, have a p0171 which is a SYSTEM LEAN code. besides, i have the spark plug defouler mod done on the second o2, which plenty of people are running on here with no CEL's. so THANKS for your constructive advice/criticism.

I am tired of diagnosing bad CATs and o2 sensors at work, and this car shows symptoms of neither, which is why i posted on here to see if anyone else had the same issue.
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Old 03-20-2010, 01:51 PM
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Re: Need an expert! will pay

OH and i forgot to mention, i just welded my exhaust in last week, before that it DID have a CAT and guess what? same codes.
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Old 03-20-2010, 03:16 PM
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Re: Need an expert! will pay

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i've got a 97 prelude with a jdm h22a swap. ok so ive been having misfire codes on every cylinder usually when the car is in open loop in the morning or when cold. thought it was an ignition related problem so i swapped the ignition coil and the coil wire, blah blah.

after looking further into it at work, i hooked up a scanner to it. at idle, my short term fuel trim starts to increase from 0 to about 46%. i figure this may be related to the misfire codes i get, which throw a CEL and do not allow me to pass inspection. if i hit the throttle, the trim goes down to a low number again, but it keeps rising at idle. the funny thing is, that both sensors show the same reading, which leads me to believe it's not a faulty 02, shows more like the symptoms of a MASSIVE vacuum leak. yet my long term fuel trim stays at 0. if i try to unplug the upstream o2, all the fuel trims go to 0. by the way, i have no catalytic converter, ive got a straight pipe with a spark plug de-fouler on the post cat. o2.

i had originally done the coolant bypass on the fast idle valve, but i blocked off the ports properly soo that can't be giving me a vacuum leak. swapped out my IAC, checked for vacuum leaks, and nothing.

i do have a walboro 255 fuel pump that the original owner had put in because of the turbo setup it used to have. the motor is back to stock now with stock injectors, stock fuel rail and regulator. when i pull the hose off the fuel pressure regulator, nothing happens, is this normal? is anyone running the same pump with a stock injector and no problems?

i'm truly stumped and have run out of ideas.... any help would be greatly appreciated! if someone can figure this out i will send them a payment through paypal to show my gratitude.
Your out of my league, hope you find a fix
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