Mr. 9Frank

Hi all. Recently Ive acquired my first Porsche, specifically an 86 944 turbo. Unfortunately I went about removing some of the dust from the engine bay with a pressure washer. Although I was very **** about what areas got attention, I somehow manage to dislodge something relatively important.

Once I started the vehicle after washing the bay, ran smoothly for a few minutes then shut off without a sputter. I then went to restart the engine and it starts on the first attempt WITHOUT ISSUE, but if given any gas, will sputter until it shuts off.

After getting her back home to hunt a little deeper, the idle became rough as if there was a pretty sever vacuum leak. I then went about removing the fuel rail and intake manifold in order to hunt down the issue, to find nothing out of place.

After re-installing the plenum/fuel rail the car will no longer hold an idle AT ALL. The engine immediately shuts down after cranking, but it does fire up. Any help with further diagnostics would be highly appreciated.

BTW the car is running the Quad-M 85mm MAF which could be the culprit to my issue But I have yet to test.

Fintro11

Check your vacuum lines
And check your connection plugs

Mr. 9Frank

yea, Ive checked all the obvious possibilities. It has to be something which resulted from the water or pressurized water because prior to this I have yet to have ANY problems what so ever. It hasnt run since (been about a week)

Mr. 9Frank

Dang, I need to move this to the Turbo and Turbo S forum

catamount

Throttle position sensor possibly? It's right there where a pressure washer my play havoc with it.

Mr. 9Frank

I do believe that could possibly be the reason for the stalling on accell but now I must determine the issue with the instant shut off after the engine fires. I would call it a fuel issue from the way it fires then just dies. DME relay is good.

ZR8ED

Water in engine bay..bad idea. All you can do now is unplug every connector you can find, and make sure it is clean and dry. Everything may look ok..but something got wet. Open the hood and let it dry out. Yes there is a chance something may have "moved" due to the pressure washer spray hitting it, but most of the time, it is "simply" a matter of an electronic part getting wet, and hopefully not fried...

Goodluck.

Mr. 9Frank

What components under the manifold (most likely to have been in a lil puddle for a little while) could have possibly fried. Ive only been under my manifold once and didnt see anythin major other than the Idle control. Should I consider replacing it first because it no longer idles at all.

Campbelljj

Pressure Washers are Bad for cars, especially around engines, trim, etc. maybe not so bad to clean undercarriage. My guess is the harness connection to the AFM got wet. Remove and clean. Good point on vacumn lines also.

Mr. 9Frank

Ill check back after I inspect a few areas, Thanks

Cole

Eh, not really. Improperly using one could be bad.

I've pressure washed engines for decades without issues.

xsboost90

dry out your distributor cap and pull the plug wires and check around them. Compressed air is your friend.

Cole

For the most part if something was loose enough to come off with your basic home pressure washer, that part needed replaced anyway.

944hal

Any water in the passenger footwell. These cars are know for rusting through the battery compartment and leaking water on the ECU.

Cole

First time I've heard this in years and years of dealing with these cars


????? WTF????? These cars are known for NOT rusting except n rare cases