Bad Idle after warmup (Page 2/2)
fierosound MAY 10, 07:29 PM

quote
Originally posted by Markeeise:

But get this, sometimes while I am driving and the engine is hot and I come to a stop it idles perfect right at 900, then il accelerate again and the next stop I come to its rough idle again, it is so mind-boggling.



OK... and intermittent. Yup... those are frustrating.
Did you change PCV valve?

It seems that ECM isn't happy with something, or is getting a false reading from something.
Erratic power and ground can cause this.

Check that engine has both ground straps to frame in place and good clean connections at both ends.
http://www.fiero.nl/forum/A...090907-2-085268.html

Also make sure all power connections are clean and tight.
The Power Distribution Block is next to the battery.
http://www.fiero.nl/forum/Forum2/HTML/134593.html

And any connectors that plug onto engine sensors.

You may try disconnecting MAP when idle is rough as described here:

[This message has been edited by fierosound (edited 05-10-2020).]

Markeeise MAY 10, 11:14 PM

quote
Originally posted by Patrick:


Have you read over this thread in regards to the importance of good grounds?

EVERYONE with a V6 please Read



I will take a look at that tomorrow and get back to you on the results, thanks for your help
Markeeise MAY 10, 11:16 PM

quote
Originally posted by fierosound:


OK... and intermittent. Yup... those are frustrating.
Did you change PCV valve?

It seems that ECM isn't happy with something, or is getting a false reading from something.
Erratic power and ground can cause this.

Check that engine has both ground straps to frame in place and good clean connections at both ends.
http://www.fiero.nl/forum/A...090907-2-085268.html

Also make sure all power connections are clean and tight.
The Power Distribution Block is next to the battery.
http://www.fiero.nl/forum/Forum2/HTML/134593.html

And any connectors that plug onto engine sensors.

You may try disconnecting MAP when idle is rough as described here:






Wow a lot of great information, I guess tomorrow I have a lot of things to check, il get back to you on any results. thanks so much for helping me out!
fierosound MAY 11, 11:58 AM
oops

[This message has been edited by fierosound (edited 05-11-2020).]