Resetting the ECU

[Treachery]

Thanks guys. VERY informative stuff. I think i resolved the problem just as Jeff and 82 GT advised. I used a combination of the 2 methods. And yes... I shouldn't have touched that idle stop screw in the first place! I've also replaced the idle bypass valve for good measure.

After resetting the ECU, adjusted idle & TPS, the engine still sound like it was not idling correctly. But after about 85 total miles of driving to and from work, it was as if the EEC-IV "woke up" and idle was OK.

Ok... So now i got the darn thing to idle somewhat correctly.

Now i'm noticing that engine will idle at 850rpm or so... perfect. But after a few minutes, the idle will DROP to around 700-750rpm and begin to sputter as if power was cut in half. I would then have to rev the engine a little to prevent it from sputtering and eventually stalling out.

Did i miss something?

PS- I posted new message about another weird issue. Subject: "Smoke Blowing Through The Vents!" I don't know if all these issues are related.

[Jeff Chambers]

Originally Posted by Treachery

Now i'm noticing that engine will idle at 850rpm or so... perfect. But after a few minutes, the idle will DROP to around 700-750rpm and begin to sputter as if power was cut in half. I would then have to rev the engine a little to prevent it from sputtering and eventually stalling out.

As I mentioned, the engine is trying to achieve its programmed idle setting which is 672 in nuetral while sitting still (no vehicle speed). See the attached image for the idle settings. These are just a few of the scalars, there are multiple tables and even more scalars that determine idle quality.

The computer will ALWAYS strive to reach these settings. If these settings don't provide the driveability that you're after, then you need to have a qualified tuner set you up with a custom program that does provide the idle quality, driveability and performance that you want.

[Treachery]

Very good Jeff and thank you.

During my last dynotune, i told the [SCT] tuner to set idle at 850rpm which he said that he did.

He got an extra 44hp out of the engine but the idle was still bad. He said that he set it for 850rpm but i think he did not know how to tune the idle correctly.

Assuming i'm correct, to who can i send the chip to? All i need is the idle tuned correctly. The 44hp gained from the SCT tuner chip is impressive.