mikeh
Well-Known Member
- Joined
- August 2, 2001
- Messages
- 262
- Reaction score
- 0
- City, State
- St. Louis, MO
- Year, Model & Trim Level
- 98 XLT SOHC V6
I'll start one more idle problem thread .
I've been having problems with my idle when I start after the truck has sat overnight and the tempeture is cold out. Here is what happens. I don't touch the accelerator at anytime while starting the truck. I crank it over and it starts right up and the idle jumps to about 2K. Then it starts idleing back to about 500RPM then it jumps down to about 300rpm and almost dies and then it settles down to about 400rpm and stays there almost dieing the whole time. If I throw it into gear then the truck sometime will die and other time will kick the idle up a bit and I can back out.
Once the truck is warm everything works perfect.
I have 80K miles on this 98 SOHC 4.0 Liter X.
I've read all of the threads on the IAC valve and thought that was it but I was wrong. Here is what I've done so far.
Replaced the battery.
Replaced Plugs and wires with new Motocraft parts.
Replaced the IAC Valve.
Cleaned my MAF thingy.
From all of the posts I've read I have a small list of things it still might be I'll list them for discussion.
1. Lower intake manifold gasket?
2. Reflash PCM?
3. Clean Throttle body?
4. Throttle position sensor?
5. Cam Tensioners?
I've had the truck since new and I had too many miles to get the plastic chain guides replaced under recall.
Any thoughts on this are greatly appreciated. And I think I have read every thread on the subject in this forum.
Thanks,
MikeH
=Post 33 has the solution =
I've been having problems with my idle when I start after the truck has sat overnight and the tempeture is cold out. Here is what happens. I don't touch the accelerator at anytime while starting the truck. I crank it over and it starts right up and the idle jumps to about 2K. Then it starts idleing back to about 500RPM then it jumps down to about 300rpm and almost dies and then it settles down to about 400rpm and stays there almost dieing the whole time. If I throw it into gear then the truck sometime will die and other time will kick the idle up a bit and I can back out.
Once the truck is warm everything works perfect.
I have 80K miles on this 98 SOHC 4.0 Liter X.
I've read all of the threads on the IAC valve and thought that was it but I was wrong. Here is what I've done so far.
Replaced the battery.
Replaced Plugs and wires with new Motocraft parts.
Replaced the IAC Valve.
Cleaned my MAF thingy.
From all of the posts I've read I have a small list of things it still might be I'll list them for discussion.
1. Lower intake manifold gasket?
2. Reflash PCM?
3. Clean Throttle body?
4. Throttle position sensor?
5. Cam Tensioners?
I've had the truck since new and I had too many miles to get the plastic chain guides replaced under recall.
Any thoughts on this are greatly appreciated. And I think I have read every thread on the subject in this forum.
Thanks,
MikeH
=Post 33 has the solution =