Mechanics

I HAVE A 96 AND RECENTLY I STARTED THE ENGINE AND THERE WAS A LOT OF SMOKE COMING FROM THE EXHAUST, WHEN I READ THE CODE IT SAID A MISFIRE IN NUMBER 3 CYLINDER. I ALSO HAD FUEL LEAKING FROM BEHIND THE EXHAUST MANIFOLD LANDING ON THE OIL PAN. CO

1996 Saturn SL2 • 140,000 miles

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Polish prince
October 30, 2011.



What is the exact code number?It will be a P and a four digit number?Also what color is the smoke?Is the smoke only after starting it?Or does it smoke all the time?

Saturntech9
Oct 30, 2011.
The code isP0303- cyl 3 misfire, smoke appears white and fuel is coming out of the tailpipe and pooling on my garage floor plus still running out from behind exhaust manifold.

Tiny
Polish prince
Oct 30, 2011.
White smoke usually indicates coolant is getting into the combustion chamber. Check compression to that cylinder and check for coolant usage.

I think I got it figured out. I may have a bad coil pack that is causing that cylinder not to fire so the fuel has no place to go but out the exhaust manifold. Gonna pick up an ohm meter and check resistance

Tiny
Polish prince
Oct 30, 2011.
With car idling carefully pull off the number 3 plug wire off the spark plug see if you have a nice blue spark. Let me know what you find.

Saturntech9
Oct 30, 2011.
Changed the coil pack and getting spark but code still reads misfire cylinder 3. My fuel is getting into the exhaust manifold and its leaking out where the manifold and lead pipe are connected. Its seems like I have something wrong internally with that cylinder causing fule to leak through. Was going to take off valve cover but not sure if I will find anything wrong. Any ideal what it could be?

Tiny
Polish prince
Oct 31, 2011.
Low compression on cyl number 3 go to auto zone and rent a compression tester. Let me know when you have it and I willgive you directions on doing the compression test.

Saturntech9
Nov 1, 2011.
Checked compression got about 150 on first 7 cranks according to my haynes manual. Cranked again and got 225 psi. The plug in that cylinder has strong gas odor. The other cylinders checked compression at 175psi. 180 for service is normal according to haynes. Now I am starting to think the fuel injector on 3 cylinder is malfunctioning flooding the cylinder. When I took the electrical connection off that injector it looked like there was oil in the connection. Tomorrow I am going to qtip the oil out and try starting the engine with the electrical connection undone to see if fuel still comes through exhaust

Tiny
Polish prince
Nov 2, 2011.
Try switching the injector with a different one to see if the problem follows the injector.

I have seen a few of those injectors flood a cylinder out pretty bad. If you had a fuel pressure gauge and a injector pluse tool I could tell you how to do a injector flow test to see if the injector was pumping too much fuel.

Saturntech9
Nov 2, 2011.
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