ok i have a b18c swapped 98 hatch

it running a rather high compression ratio and built head + cams

anyway the car is rom tuned and was running really well for quite sometime but last night passed some traffic last night and as soon as i let off the throttle the car started backfiring and ran like poo at anything less then 60% throttle

anytime i came to stop it either stalled or came close to stalling

eventually the check engine light came on and the car started running fine, with a slightly higher idle then normal.
problem is, once i got to my destination and turned the car off the check engine light reset and the car is running like *** again.

anyone ever have a similar problem?
will an obdII diagnostic tool tell me whats wrong without the check engine light on?

please get back to me asap
and thanks in advance

mike

 

any ideas?

 

helllloooooo

well ok answer me this
i was told by friend to disconnect and reconnect my ecu

im willing to try this but i need to know if this can potentially F up my tune?

any one????

 

No ideas, but the engine runs OK in open loop (CEL on). That would lead me to believe you've got sensor or wiring issues to investigate.

 

thank you very much for responding

im thinking more and more that is my o2 censor

as its running overly rich now, its been raining for the past few days so i havent had a chance to inspect it