P0420, P0302, P0303, P0304, P0171

jeff87xp · **Joined:** Sun Nov 18, 2007 4:47 pm **Posts:** 2

I have a 1996 Ford Contour, 4 cylinder DOHC with the following issues. Each of the error codes seems to have a different fix, and I am not sure where to go from here.

• Rough idling
• Sitting several hours in cold weather, all while car is parked not in gear: held gas pedal at 50% - RPM drops from ~5000-6000 down to idle, then engine dies. Took 5+ cranks before it would start again - running dry / no fuel.
• Worse in cold weather. When engine warm, problems almost non-existent
• Fuel pressure WAS 4lbs under min before the pump and regulator were replaced. I do not have a gauge, so I am not sure if that is back up, but the symptoms did not change.

REPLACED:
Fuel pump
Fuel filter
Fuel pressure regulator
Fuel injectors
Air filter
O2 sensors
Spark plugs

TROUBLE CODES:
P0420
Catalyst System Efficiency Below Threshold (Bank 1)
P0302
Cylinder #2 Misfire Detected
P0303
Cylinder #3 Misfire Detected
P0304
Cylinder #4 Misfire Detected
P0171
System Too Lean (Bank 1)

Sponsored Links · **Joined:** 29 Jun 2004 08:12 pm **Posts:** N/A

jeff compton · **Posted:** Mon Nov 19, 2007 8:40 am

need to verify fuel pressure and 02 operation, vaccum leaks etc!, egr, MAF reading etc!

bear · **Joined:** Sat Oct 20, 2007 6:50 pm **Posts:** 46

be sure to check your exhaust backpressure, sounds like it could be all related.

jeff compton · **Posted:** Tue Nov 20, 2007 6:55 am

wrong forum by the way!

jeff87xp · **Joined:** Sun Nov 18, 2007 4:47 pm **Posts:** 2

Thanks for the help. I bought a new car today since the Ford was a money pit.

jeff compton · **Posted:** Wed Nov 21, 2007 5:53 pm

aren't they all!

P0420, P0302, P0303, P0304, P0171

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