Schmidi

Help needed!

A few years ago i swapt the tbi on my 88 camaro to a tpi of the same age. since there everything worked fine and the engine runs perfect.
Since a few weeks idle rpm's are to high. I did all necessary steps to base-set them. after a short drive idle is high again. i checked the settings with winaldl and it seems that the computer goes not into closed loop. the readings with winaldl for the temperature, o2 sensor etc. look fine, for me. I attached pics from the readings of winaldl!

Change the ecm? or the prom? or anything else?

every help is apriciated

stefan

RBob

iTrader: (1)

the O2 sensor needs to be active for the ECM to go into closed loop fueling. In both screen shots the O2 is around 450 mv, which is inactive.

If the engine is just sitting there idling get more heat into the sensor. Hold it at a higher idle and even some light blipping of the throttle to get the O2 sensor voltage to move.

As for the high idle, the TPS value and IAC steps at idle is critical on the MAF TPI setups. Even the PCV system enters into the idle.

RBob.

Schmidi

Hello RBob

thanks for your advice! I had that in mind that the problem could be the O2 Sensor. But i had no Idea what the readings should look like. Found some different posts in the web about that....
Hope that would be the right solution

thanks

stefan