1993 Nissan Primera

Engine Performance problem
1993 Nissan Primera 4 cyl Front Wheel Drive Automatic 300770 miles

I have a 93 primera starts normally when cold soon as it gets hot fuel seems to richen has been put on computer and will not allow scan for error codes
Dion Collie
March 24, 2010.

Probable causes of an engine running rich are as follows: 1. Fuel pressure not within specs. Can be cause by restricted fuel return line or defective fuel pressure regulator.
2. Defective Oxygen Sensors.
3. Leaking injectors.
4. Coolant temperature sensor out of calibration.
5. Restricted air intake system.

Mar 24, 2010.
Hi thanks for that
I have managed to dwnload a p10 manual

Have had another look at the problems and
The engine check light is NOT on.
Have done checks the book specifies they seem to check out (egr etc: engine seems to gradually start hunting and tries to leap forward.
Have also checked air cleaner
vaccume lines for leaks
One thing I have not checked is the 02 sensor
All of the checks have been done manually

Dion Collie
Mar 26, 2010.