hatchboy93

ok when i put a gsr ecu (p72) in my car theres no check engine light but when i floor it when vtec kicks in the car bogs down bad and wont rev any higher but the check engine light still doesnt come on but when the car goes over about 50 miles per hour then the ceck engine light comes on. when i put a chipped p28 in my car theres no check engine light and vtec works perfectly and there are no check engine lights at all. well i want to check my ecu code for the CEL on the gsr ecu but when ever i turn my car off the ecu light goes away the only way i can get it to come back on is if i drive my car about 50 mph then it comes on but i cant check it while the car is idling i dont know what to do....

smnowell

Have you tried jumping the ECU, even though the light doesn't come on when you restart the car? It should still be stored in there... It might be a knock sensor issue, cause i know the P28 doesn't look for a knock sensor. If you get code 23 then that is your problem (I believe thats the code for KS)

hatchboy93

yea i tried jumping it and the check engine light just stayed on it never blinked all it did was just stay on... im hoping its the knock sensor but i cant tell. i did wire the KS up so i dont know why it would be bad... i just need some advice on what to do i cant read the code because the light always goes away after i turn the car off

hatchboy93

does anybody know what im talkin about?

hatchboy93

ok when i use a chipped p28 ecu that doesnt look for knock sensor my car runs fine vtec works perfectly and no bogging down. but when i use a gsr ecu p72 or a chipped p30(delsol) ecu that both look for knock sensor then my car starts boggin down when vtec kicks in and wont rev any higher... but i am confused because my friend that uses his p30 ecu does not have knock sensor hooked up at all and his runs fine. if i could just check my ecu i could figure this out but i cant becasue teh light keeps going away everytime i turn the car off.... any one have any clues???

hatchboy93

if the knowck sensor is the problem wouldnt the check engine light come on right when i started my car?

hatchboy93

some one has to know this

eg_nezay

Check for the code when its on, I've done it , nothing happens.
Your car goes into safe mode when it boggs, so just check it.

hatchboy93

so your saying when my check engine light comes on while im driving i can pull over on the side of the road or parking lot and while the car is still running put the paper clip in teh little plug and check the code???? i heard from a lot of people that u can fry yor ecu this way... are u sure?

eg_nezay

Thats the only way youll be able to read it, cause every time u turn off the car, u reset the ecu.
Like I said, its happened to me, that I get a code, and then I cant read it after I turn off the car. So, what I do, is pull over right away and check for codes if the engine light came on.
Done it alot of times and my ecu is fine....

slo4door

iTrader: (10)

Are you running a GSR P72 with a B16? If so, i had the same problem. Im running a p72 with my b16 and it use to throw a knock sensor code when i went over like 90 mph for some reason. Then i could turn the car off, turn it on and it would be gone. I put a V-AFC in the car and it never comes on now. Dont know if that will help ya but it might be a suggestion. I know the B16 hates VTEC hitting at 4500 like the GSR's do.

hatchboy93

im running a jdm type r b18c with a p72 gsr ecu.

slo4door

iTrader: (10)

Hmmm.....well i dont know if i can be of much help there. But like i said, if you have the money or can borrow one, you may wanna try a vtec controller of some sort. don't know if that will help you, but it did me. good luck man!

slo4door

iTrader: (10)

one more thing. Is it a JDM p72 or a USDM p72?

redcivic

Just get a Type-R ECU. WTF?