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Old 08-24-2013, 11:31 AM
Ted98 Ted98 is offline
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Join Date: Sep 2012
Location: West Chester Pa
Age: 33
Posts: 16
Gender: Male
Vehicle: 1998 Dodge Ram Magnum
Trim Level: SLT
Color: Red
Engine: 1998-2001 360ci (5.9L) Magnum V8 245hp(standard), 250hp(Sport package)
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Question low idle, bogging down and backfire

I know this is a common problem with our trucks but the common fix did not work.

When I start my truck up in the morning or any time after it has been sitting long enough to cool down, it will idle at around 450 rpm and when I start to go it will bog down and backfire.

I know the common fix for this is to replace the IAC and I have done that already. I am a heavy truck mechanic so I own or have access to a lot more tools and equipment then the average driveway mechanic. I tested the compression and it is good across all cylinders. No vacuum leaks and no codes are being thrown either.

About 3 months ago I had a bent valve on the #1 cylinder. I pulled the head and replaced it. But the problem still exists. The problem existed before that too.

The real kicker is after I have been driving for 10 min or so the problem goes away. The idle comes up to about 650rpm and the truck has no issues with accelerating or idling.

Anyone have any clue what is going on here? Because I'm all out of ideas.
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