will not stop
Thread Starter
Racer
Joined: Dec 2004
Posts: 276
Likes: 1
will not stop
This is an odd one, have a 2003 totally stock about 10% or the time when I pull off the highway and prepare to stop the engine is still turning 1,500 rpm. After I jam on the breaks for about 2 seconds the engine finally responds and the RPM's drop to normal. Any ideas as to what is causing this, Thanks.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Unless you are having an accelerator peddle sticking issue, the only other issue that I can see that would cause a high idle would be a vacuum leak. Other than a an actual vacuum line/fitting or manifold leak, your Brake Booster could be malfunctioning and venting, causing a vacuum leak (unmetered air entering the engine)
Check ALL the vacuum lines and fittings.
You could also scan the PCM and see what your LONG TERM FUEL TRIMS are doing. That would tell you if the engine is having to compensate for that unmetered air. Long Term Trims should be close to zero % if everything is functioning properly and would be high or maxed out (25%) if the leak is large.
Check ALL the vacuum lines and fittings.
You could also scan the PCM and see what your LONG TERM FUEL TRIMS are doing. That would tell you if the engine is having to compensate for that unmetered air. Long Term Trims should be close to zero % if everything is functioning properly and would be high or maxed out (25%) if the leak is large.
Last edited by Bill Curlee; Oct 28, 2020 at 04:18 PM.
