[rick38]

When I turn the A/C on my van feels like it is going to stall. There are no secondaries (codes or Lights). I do not know if the A/C is actually causing the problem or amplifying it. I suspect it is electrical ( Ignition) or has something to do with the vacuum. I did have a problem with the A/C defaulting to defrost mold.I found a broken vacuum line and replaced it. Now it works fine. I'am hoping somebody can point me in the right direction for the rough idle.

Thank You
Rick 38

 

[johnny-77]

Lets start with the basics has the engine ben tuned up recently? Has this just started this or dont know recent purches? Does it cycle wanting to stall then pick up then try to stall with i a few seconds? Theis questions will help a corect diagnosis or at least help us point you in the right direction. :think:

 

[rick38]

I have owned for 10 years it has 140000 miles on it. Tune up was done at 110000 (2nd). I want to say it started 2 to 3 mos after Tune up. I normally do not use my A/C but its been hot lately.

And its idling as you described.... It had a problem at 110000 where it would almost stall in reverse. The Tune up fixed this, the mechanic said it could of been due to Bosch parts installed the first time. He installed dealer parts.( Cap, Rotor, Wires, Plugs ) Fuel Pump was also replaced at this time. Fuel Pump has been replaced twice. The following items have been replaced Fuel Pump ,Alternator, Serpenitine Belt, Engine Gaskets Intake, Valve Cover. Vacuum Line the one that runs under the air cleaner. Air conditoners and windshield wiper motor. Driver side window motor.

Thank You
Rick38

 

[kidhauler]

Am I reading this correct you have not done a tune up in 40000 miles and you wonder why the van doesn't idle right??? Your lucky it still runs at all. I do the plugs and lead cap and rotor every year at least the last van I had for only a year and did them 2 times as the van began to back fire. Do your plugs, leads, cap , rotor and clean out your fuel injection and put in a new aircleaner. That should get it running nicley then if you still have a bit of hesitation you can look at doing other things

 

[rick38]

Dealer recommends every 80000 with the platinum plugs. This problem started a couple months after the last tune up.I also Inspect the cap,rotor and wires every year. The car idles and drives fine. Only when the A/C is on do I I get the rough idle.They had it hooked up to the machine last month looking for the vacuum leak. I do not think the dealer would of past up the chance to sell me a tune up if that was needed. I was hoping it had something to do with the vacuum leak they found and fixed. But it did it on the way home. Their suggestion was to bring it back, but before I do that I would like to have some kind of idea what it might be so they dont lead me the wrong way.

 

[johnny-77]

An other vac leak is the likely cause,folowed by carbon build up if the tune up is sill good. As for the spark plugs regardless of the type of plug Id change them out. Iv had good brand plugs worn out at 35k to wear the gap is double where it was set at during the tune up. Hope this helps!!!