volvo 760 2.8 gle engine problems

[Laird Scooby]

Originally Posted by gordyctill

hi my problem is I start the engine from cold it just idles and when I try to rev it it splutters and when it worms up its just the same I have got a new maf it is not a bosch it is a lucas I don't know if that makes a difference and that's my problems.

Does the new MAF make any difference? Also have you checked the idle mixture? It may need adjusting but when was the fuel filter last changed?

[gordyctill]

I have changed the fuel filter how do you adjust the fuel idle I have no idea thanks

[Laird Scooby]

Originally Posted by gordyctill

I have changed the fuel filter how do you adjust the fuel idle I have no idea thanks

You need to have an exhaust gas analyser of some description, engine up to temperature and idling. By rights all the other things should be correct as well (TPS idle switch made, base idle speed correct etc) and then set the mixture to 1%CO +1/-0.5% but ideally around 1% using the mixture adjustment screw on the MAF.

Have you checked the CTS is working correctly? It's the one just below the 'stat housing :



Disconnect the plug, use your multimeter on resistance and check the resistance of each pin in the sensor to earth ('stat housing) which at 20C should be ~2500 Ohms +/- 8% roughly. As a final check, measure between the pins where you should get the sum of the two resistances previously noted.
Given the current ambient temperature, i'd expect to see somewhere in the region of 3-3.5k per leg on the sensor.