Fuel and Compression Test Problems. *HELP*

[Boost95]

Well my car has been gettin a CEL latley and I though it was just from the downpipe not having a cat. But I got it scanned and it came up as #1 Cyl. Misfire. After checkign thru things I came to the conclusion it is the fuel injector. While the car is running when I remove the harness for the #1 cylinder it makes no difference and runs the same way. therfore that is my problem with the misfire. Second, The car runs almost perfect except for a small misfire at idle( sounds like a subaru), but the car still runs fine thru the RPMS. No smoke no nothing. I did a compression test and the #1 cylinders PSI is only 50! other cylinders are 2-150/3-200/4-200. Is the reason my car is not smoking at all is because of that injector and not combusting enough make the car smoke? Im confused and I woudl liek to get some input on this. Thanks
Mike

 

[NOSLO2PT0]

Pour a small capful of oil in that cylinder and see if the compression goes up. If it does, you need new rings. If not, you may have a leaky valve. Not sure what caused it. Possibly too much boost, etc. The reason it runs the same is because you don't have enough compression in that cylinder to ignite the air/fuel mixture. That why nothing happens when you pull the injector harness off. Let the car run for a second, then pull the spark plug in that hole. If it's wet, that tells you it's NOT the injector.

 

[oldman]

Please complete you car profile. If your car is a turbo then the #2 cylnder is the only normal one. Tell us the conditions of your compression test, ie. car temperature, wet or dry, throttle fully open...etc.

 

[Boost95]

Sorry about the profile. I have had so many DSM's I 4get to update. Its a 97 TSI AWD- 3 inch turbo back,intercooler pipes,K&N. I poured one capful of oil in it last nigth and made no difference at all. I may have not put enough in but made no difference. If it did no make enought compression wouldnt it be running on 3 cylinders? The idle is only a little bit weird liek a subaru but revs and drives perfect. Also the boost level is set to stock. Ive checked plugs numerous times and they dont get fouled they look excellent. Im running the NGK's and they are working great. The car was to full operating temp before I pulled it into the garage and did the test, I did a wet and dry test- same results from both and it was at full throttle. Thanks for the help. Keep it coming.

 

[oldman]

Sorry about the profile. I have had so many DSM's I 4get to update. Its a 97 TSI AWD- 3 inch turbo back,intercooler pipes,K&N. I poured one capful of oil in it last nigth and made no difference at all. I may have not put enough in but made no difference. If it did no make enought compression wouldnt it be running on 3 cylinders? The idle is only a little bit weird liek a subaru but revs and drives perfect. Also the boost level is set to stock. Ive checked plugs numerous times and they dont get fouled they look excellent. Im running the NGK's and they are working great. The car was to full operating temp before I pulled it into the garage and did the test, I did a wet and dry test- same results from both and it was at full throttle. Thanks for the help. Keep it coming.

A capful is enough but doesn't make sense that it didn't make any difference, it should make some difference anyway. I would do the compression test again just to be sure and leak down test after that. Good luck.

 

[Boost95]

I tried the compression test 3 times and came up with the same results each time.

 

[oldman]

I tried the compression test 3 times and came up with the same results each time.

In that case like NOS said, it's probably the valves. It's probably not the HG but only a leak down test can be sure.

 

[Boost95]

This Fu*kin sucks

 

[Boost95]

I was wondering with it being something so major.. Why does my ca still run so damn good and smooth? It does not smoke at all either..

 

[Boost95]

We'll I sent the car out for a leakdown test and he todl me I need a HG. While he had the car I ordered the HG he installed it and runs alot better. I was going to just do a full rebuild but he told me everything else looks pretty good. I thought the car ran good b4, It runs a hell of alot better now! Thanks for the help every1