Engine 4.7, recently tuned-up, IAC valve has been changed, fuel pressure at idle (50psi), no check engine light.
May 9, 2012 at 8:43 PM
What could be causing my vehicle to surge and stall out at idle
2003 DODGE DAKOTA
BOOPER2893
- MEMBER
- 3 POSTS
Advertisement
FIXITMR
- ✓ASE Certified Mechanic
- 9,990 POSTS
is it completely stock?
May 9, 2012 at 10:07 PM
Yes completely stock
May 10, 2012 at 11:04 AM
FIXITMR
- ✓ASE Certified Mechanic
- 9,990 POSTS
haven't seen a definitive answer for this problem. lots of people out there have spent big money with no solution. clean your MAF and maybe replace pre cat OX sensor(s).
May 10, 2012 at 7:11 PM
Thanks, it turned out to be a bad TPS.
May 12, 2012 at 12:53 PM
CARADIODOC
- ✓ASE Certified Mechanic
- 34,321 POSTS
Hi guys. I don't mean to argue with success, but a throttle position sensor can't be bad without setting a diagnostic fault code and turning on the Check Engine light. The symptoms you described are a very common result of disconnecting the battery. Until the Engine Computer relearns "minimum throttle", it won't maintain proper idle speed. The additional clue is you usually will not get the nice "idle flare-up" to 1500 rpm for a couple of seconds when you start the engine. Is it possible your mechanic just went out and drove it to do the relearn, but perhaps charged you for the TPS that he tried first? Many of them aren't aware of the conditions that must be met for the relearn to take place, and when they do that without knowing it, they assume the parts they just put in are what solved the problem.
May 13, 2012 at 12:39 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.