S4 low idle problem
#1
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S4 low idle problem
How do you guys find your vacuum leaks? I recently pulled the upper intake manifold on my s4 to do the omp delete and after putting it all back together my car has the symptoms of a vacuum leak. Ive already blow vapor smoke into several different lines and saw no smoke rise from anywhere. I also tried isopropyl alcohol in a spray bottle and soaked anywhere there could be a leak. And i used the propane torch method. My car does idle at about 700-1000 (Does drop down to 500 sometimes and itll bounce around and almost die) but thats with the mixture screw tuned to as rich as possible which I'm not comfortable with. The fuel pressure regulator is working just fine as is the fuel pump. The air pump is bare, no lines are attached to it and i unplugged all the connectors going to it. I havnt been able to test the tps because all the write ups are for the s5 which is a much different system, but i did unplug it which just made it die. Before i adjusted the mixture screw it would die at idle
Air pump area
Throttle body
Dynamic chamber
Engine bay. Ive rotated the afm back to oem position and its made no difference
dynamic chamber
Last edited by 86glxNA; 08-21-15 at 04:01 PM.
#3
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Its some ebay water neck. And i blocked them with the block screws from pineapple racing with thread lock. And i didnt use a new gasket but i couldnt find any leaks around the manifold using any of the methods i named
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#6
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I read many threads where people have reused the intake gaskets, and couldn't find a vacuum leak, but it was their problem. new gaskets are alway the way to go when your in there, they are over 25 years old, and they are cheap, don't be cheap with these cars, they will bite you back when you try and bite a penny
#7
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I read many threads where people have reused the intake gaskets, and couldn't find a vacuum leak, but it was their problem. new gaskets are alway the way to go when your in there, they are over 25 years old, and they are cheap, don't be cheap with these cars, they will bite you back when you try and bite a penny
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