missing at idle ?
 

Ok, here we go,I cleaned my throttle body with some intake and throttle body cleaner the other day,it was on the car when I did this,now when I run the car it misses at cold start up pretty bad,and also misses a little after it warms up. When it comes to power it runs real good, I've got Jacobs wires,accel coil and a 6 month old cap and rotor, I keep leaning towards the AAV to be the culpret,but I don't know,I ran two tank fulls of 93 oct. with fuel injector cleaner in each tank,did'nt help. Will a AAV cause it to miss at idle? My car dosn't fluxuate(sp) rpm at idle, it just misses. Could I have clogged the AAV up when cleaning the throttle body? Everything was real nasty inside there too. 83' 944 THANKS

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Drive it like you stole it........Justin

i'd definitely check the AAV, and the electrical connections that go to it, along with the hoses that lead to i too.

good luck!

obin

Well the hoses are fine and so is the electrical connection,I guess it would be inside the AAV where the problem lays,any other ideas Obin, or anybody else?

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Drive it like you stole it........Justin

bump

The '83-'85 have an auxilarly air valve and the '85.5 and newer have a idle control valve. Both do about the same thing, let a little more air in for the more fuel the DME shoots in on a cold start. If your valve is stuck open it will idle at about 1500 rpm's and if stuck closed you will have a low rich rough idle at start up and run fine after about 1 minute of warm up. Neither condition should cause an actual miss. If stuck open you will be too lean all the time like a vacumn leak but not a miss. Now the low rpm rough idle at startup could act like a miss but that should stop when marmed up.

Is your idle low and rough on start up and then cleans out after a couple minutes?

I wonder if the cleaner killed the throttle positon sensor? I am not sure if it will hurt it or not. Does anyone else know???
It would be pouible if the throttle position sensor died from the solvent the DME would be getting a bad signal.
Did it start after the throttle body cleaning?

Yes, it started right after the throttle body cleaning,I should have left it dirty.

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Drive it like you stole it........Justin

actually I have been having the same problem as you are having and come to think of it I cleaned my throttle body with spray cleaner on the car last fall and had the problem you are talking about ever sense.

Hmmmmm, we need to figure this one out. TPS sensor?

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Drive it like you stole it........Justin

I don't know if throttle body cleaner will hurt a TPS or not.

Anyone know?

Justin,
missing at idle? oh man. i answer this post once a week. and the answer is ALWAYS the same. Sell it and buy a 951. Sure its possible to fix that problem for 150 bucks, but then what are you gonna do when something else breaks? Do it the right way and buy a 951 for $15,000. after all, who DOESNT have that kind of cash laying around, right?
-your friend 'who has a knife'
Paul
86 Normally Aspirated, multi-colored 944

He,he...... http://www.pelicanparts.com/ultimate/biggrin.gif

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Drive it like you stole it........Justin