Running Rich
Thread Starter
|
Registered User
Joined: Apr 2024
Posts: 17
Likes: 0
Running Rich
Howdy all,
I’ve been battling a rich condition for a long time. The engine starts prematurely when cranking (the RPMs don’t surge like normal) and idles rough. WOT is no problem with plenty of power but idle is terrible. I have an OBD-1 scan tool for my ‘95 with a 5.9 Magnum and all values are within range. Whenever I accelerate the engine sounds like it’s wheezing because the IAC valve doesn’t open enough. I did replace it with a Mopar IAC valve. New O2 sensor NTK, new catalytic converter from Magnaflow.
Any suggestions?
I’ve been battling a rich condition for a long time. The engine starts prematurely when cranking (the RPMs don’t surge like normal) and idles rough. WOT is no problem with plenty of power but idle is terrible. I have an OBD-1 scan tool for my ‘95 with a 5.9 Magnum and all values are within range. Whenever I accelerate the engine sounds like it’s wheezing because the IAC valve doesn’t open enough. I did replace it with a Mopar IAC valve. New O2 sensor NTK, new catalytic converter from Magnaflow.
Any suggestions?
Administrator
Joined: Apr 2010
Posts: 87,267
Likes: 4,197
From: Clayton MI
IAC is only active at idle. When you crack open the throttle, IAC should close up.
Have a look at your plugs. See what they look like. If it's just a couple cylinders running rich, it's a different problem from ALL of them running rich.
Have a look at your plugs. See what they look like. If it's just a couple cylinders running rich, it's a different problem from ALL of them running rich.