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Question
2002 Chrysler PT Cruiser-Turn HVAC Blower on and engine develops a pronounced miss.First thing in the morning while vehicle is warming up the engine RPM surges up and down almost acting that engine wants to cut off. Any IDEAS!!
Submitted: 370 days and 16 hours ago.
Category: Dodge
Value: $9
Status: AWAITING EXPERT REPLY
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Posted by
Petek
370 days and 15 hours ago.
Info Request
now, question, are you engaging the compressior when you are turning the a/c on? or just the blower?
369 days and 14 hours ago.
Reply
This problem started during the summer when the AC was being used. Now that the cooler weather is here and I'm only using the heat this problem still exist when turning the blower switch on. The vehicle has 125K on the clock. No ck engine lites and is running ok except for this miss at idle and the 200-300 RPM surge when warming up.I hope this info helps.Thanks!
Posted by
Petek
369 days and 11 hours ago.
Answer
The hvac system in that car is for the most part very self contained, I would examine the ground to the system it is an 14 guage wire, it's black with a violet tracer, It connects to the back of the heater control switch in the dash panel. I would check the resistance of the wire. Let me know what you find.
367 days and 16 hours ago.
Reply
Hi I'll try to ck the wire resistance this weekend.Let you know what I find!
Posted by
Petek
367 days and 11 hours ago.
Info Request
ok great
362 days and 13 hours ago.
Reply
Pulled it apart and found the grd wire you spoke about.I and the connector appeared in good shape. Unfortunately all but 6inches disappeared into the dash wire harness. I checked the wire to that point and it ohm'd ok. Any idea where the other end of this wire ends at? Unfortunately auto elect isn't one of my strong suites. Thanks
Accepted Answer
It's in the connector, lower right hand kick panel lower right hand corner. Here is a picture for you.
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Expert:
Petek
Pos. Feedback:
100.0 %
Accepts:
Answered:
11/25/2008
Dodge Technician
I have over 10 years of experience, Im a master ase tech as well as a chrysler tech
360 days and 17 hours ago.
Reply
Thanks I'll dig into it this weekend again! I'll let you know!
355 days and 8 hours ago.
Reply
Hi I checked it out between those two connectors and didn't find any high resistence.
Posted by
Petek
355 days and 4 hours ago.
Info Request
O.k. we have ruled out that it may be a ground issue, you have now checked that. Please just for verification, can you make absolutely sure that the engine misfire is unrelated to compressor engagement before we continue any further.
340 days and 18 hours ago.
Reply
Hi I found out that the AC Compressor was cycling during the defrost operation.With the added drag of the compressor operation at low RPM loading down the engine I looked at the IAC Sensor in the throttle body and associated passages.I serviced the throttle body and cleaned the IAC sensor/passage and the problem went totally away. Thanks for your help
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