2000 Dodge Truck

BONA1977

MEMBER
2000 DODGE TRUCK
V8
4WD
AUTOMATIC
153,000 MILES

Replaced ac evaparator after 2 years without ac truck does not run right when ac is turned on it surges and stalls when I come to a stop or when sitting and reving engine and taking foot off gas when ac off truck runs fine engine light out untill I turn ac on engine light comes on also replaced the tps and iac sensors. I unplug the compressor and still does not run right. Could it be vacuum?

3 Replies

CARADIODOC

MECHANIC
33,757 POSTS

Did you disconnect the battery? TPS and AIS motor didn't become defective by replacing the compressor so replacing them doesn't make sense. Since the "Check Engine" light comes on intermittently, there's a diagnostic fault code in memory in the engine computer. Read out that code; it will direct you to the circuit or system with the problem.

If the battery was disconnected, you need to relearn minimum throttle. Drive at highway speed, then coast for at least seven seconds without touching the brake or gas pedals. After that, the computer will know when it needs to be in control of idle speed.

Caradiodoc

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Tuesday, June 16th, 2009 AT 3:53 PM

BONA1977

MEMBER
2 POSTS

I replaced evaporator not compressor. Now when I turn on ac engine light comes on code 0123 comes up, I replaced tps didnt work. When I unplug compressor and cycling switch on the compressor and turn on ac engine light does not come on when I leave compressor unplugged and plug the cycling switch back in and turn on ac the engine light comes back on. I clear code before trying different things. Truck runs great when ac is not on. Had service done they said it was not tps. I did disconnect battery when replacing evaporator. Tried running at highway speed and letting go of gas for several seconds that didnt work what now?

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Tuesday, July 7th, 2009 AT 4:57 PM

CARADIODOC

MECHANIC
33,757 POSTS

Just to be clear, it's not "several" seconds; it's a minimum of seven seconds to relearn minimum throttle. That is not related to the Check Engine light though. You might have to consult a Dodge mechanic for that issue.

Caradiodoc

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Wednesday, July 8th, 2009 AT 1:01 AM