I cant figure it out, everytime i put the a/c on and im sittin at idle she will just fall flat on her face. Even if its on low or full makes no difference. but when im driving shes fine, but the second i slow up or come to a stop, bang shes stalled again. Anybody else have these issues? Could it be because of the cam or the pulleys? On a day when its 95 out i didnt pay 600 bucks to have the a/c fixed for nothing. 
She stalls everytime i have the A/C on
- Thread starter WICKED50LTR
- Start date
Idle air solenoid, aka idle air bypass. Clean it out with Gummout. When working right, it should be capable of raising your idle to 1200 or even 1400 RPM, and that means plenty of room to adjust for the ac compressor kicking on. Gunk in it not only reduces the airflow, lowering the top number, but it also slows the thing down, so it can't react quick to the compressor. It is even one of the self tests performed by the computer when you read the codes, and there is a code saying that the solenoid can't raise the idle enough, a sure sign that the idle is either mis-set or, more likley, the solenoid is gummed up.
Properly cleaned and adjusted, you should barely notice the idle move as the ac compressor cycles on and off. I'm running GT40 heads and an E303 cam, which means a lumpier idle than stock, but when the bypass is clean, the idle hardly moves when the ac kicks on. It does get a bit sensitive and raggity when air temps go above 95, but even then it works OK.
Properly cleaned and adjusted, you should barely notice the idle move as the ac compressor cycles on and off. I'm running GT40 heads and an E303 cam, which means a lumpier idle than stock, but when the bypass is clean, the idle hardly moves when the ac kicks on. It does get a bit sensitive and raggity when air temps go above 95, but even then it works OK.
Just to confirm, you do have the idle setting adjusted so that on a warm idle, with no accessories on, the car will idle with the IAC disconnected, right?
Or perhaps the pintle in the IAC is too filty and needs more vigorous cleaning?
Good luck.
Or perhaps the pintle in the IAC is too filty and needs more vigorous cleaning?
Good luck.
Or let it soak. Or just get a new IAC.
Did you happen to disconnect the battery after doing all that the first time? It would seem coincidental that this would crop up after 3-4 hours - perhaps how long it takes to fully adapt to learned settings with the A/C on.
How is the cold idle? If that sucks too, The IAC is not up to par. Some folks have had luck with the bypass plate (there is more info on all of this in Jrichker's sticky at the top of the sub-forum page).
My two cents.
Good luck bud.
Did you happen to disconnect the battery after doing all that the first time? It would seem coincidental that this would crop up after 3-4 hours - perhaps how long it takes to fully adapt to learned settings with the A/C on.
How is the cold idle? If that sucks too, The IAC is not up to par. Some folks have had luck with the bypass plate (there is more info on all of this in Jrichker's sticky at the top of the sub-forum page).
My two cents.
Good luck bud.
86T-Top
Founding Member
Did you take the IAC apart when you cleaned it? There are two screws that hold the two halfs of the IAC together, you must take it apart to get it completly clean and use q-tips to get the carbon out. I only ask b/c that site with instructions to clean the IAC doesn't mention this.
Also what do you have your idle set at when the car is warm and no accesories on? I found that I need to keep mine around 800 RPM, b/c of the E cam. Also, when was the last time you gave her a tune up? As dumb as that may sound a worn cap, rotor, or plugs can cause a crappy idle, but I doubt that is your problem.
Mario
Also what do you have your idle set at when the car is warm and no accesories on? I found that I need to keep mine around 800 RPM, b/c of the E cam. Also, when was the last time you gave her a tune up? As dumb as that may sound a worn cap, rotor, or plugs can cause a crappy idle, but I doubt that is your problem.
Mario
amplifier28
Member
- Apr 16, 2005
- 222
- 1
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Is it o.k. to clean the mass air meter with a q-tip and carb cleaner? Or do I have to use some type of electrical spray cleaner?
To clean the MAF, remove the MAF element and gently spray it with electrical contact cleaner. You can also use non-flammable brake parts cleaner (same chemical in a bigger can & cheaper too). Let it dry and put it back in.
Dbeck002
New Member
Dude it could be your voltage being so low, when you turn the AC on it probably uses up all your electrical power and the car cant run... Check for corroded cables and charge at idle w/o AC.
I'm having a problem just like this all of a sudden. The car does an engine breaking type sensation when I come to a stop after being in neutral (or pushing in the clutch) the car dies on me Makes me pretty upset. I cleaned the IAC/disconnected the battery...and it is doing a bit better but it is still surging
After a couple more drives I'll see what happens.
It is a bit worse when the a/c is on...
Idle is at 750rpm.
After a couple more drives I'll see what happens.It is a bit worse when the a/c is on...
Idle is at 750rpm.
Dbeck002
New Member
You guys probably have some killer vacuum leaks somewhere... Mine used to do that.
Do this test though. Take the belt off and turn the key on engine off with the AC on. youll hear the clutch on the AC compressor engage, try to rotate the pump. If its impossible or really hard than thats the problem.
Do this test though. Take the belt off and turn the key on engine off with the AC on. youll hear the clutch on the AC compressor engage, try to rotate the pump. If its impossible or really hard than thats the problem.
ok tried it again, took everything off, cleaned it all. IAC and the TB. unplugged the battery for 30 min, put it back together with the plug off the IAC. Ran her for a bit and she was ok, put the plug back on the IAC, went for a ride with the A/C on with no other acc. on. got about 10 miles and then she stalled at a light. Im goin to buy a new IAC today and try that. Im really starting to give up.
crazypete
All my crevices are greased.
Go to the back of the throttle body where the throttle cable hooks to the paddle and look for the adjustment screw. Start the motor and turn the screw in till it idles 1000-1100. This is the endall fix for idle problems. You'll never be bothered by silly AC and worn out PS pumps dragging again or gummed IAC. Plus it takes all of 1 minute and you can undo it just as easy if it doesnt work for you.
fivespeedsteed
20+ Year Stangneter 
AmMscl said:
same thing happened to my car and that fixed it. i made this pic a while ago of my engine when someone asked the same thing so here it is.
the two red dots are the bolts that hold it on, so unscrew those, then pull off the cylender looking thing and clean it all out with throttle body cleaner. hope i helped. oh and the red dot on top is the throttle postion sensor. this made my car run great, it idled higher with the ac on and cold startups are a joke.
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