A quick way to test a mas, is to disconnect it, the computer will go into limp home mode and it usually runs better if the sensor was bad with it disconnected. I agree with 57 on the fuel pressure reading. Another item that can be the cause is the coolant temp sensor. It could be signaling to the co...

You also need to verify that the noise is not coming from the timing belt system. Take off the serpentine belt and start the engine, if there is no longer a noise than it is the serpentine system and not the timing belt system. Make sure, because it is a interference engine, and a broken timing belt...

I re-read this and it is a little confusing.Here's a time line 1) service light appears, on for 120 seconds in morning or at start up. goes away after 120 seconds every time. 2-3 weeks 2) wife has alarm go off while getting in car at work. I show her how to reset the OFF by key to the right in door...

Great to hear, hopefully it is fixed for good.

Thanks for reporting back, it is so important.

DanR

Your ECT is located at the t stat housing up front at the upper radiator hose. 1996 and newer use OBii and they went to one sensor for both the gauge and the ecm. You might have a head gasket leak, but would pull the spark plugs and inspect, if it has been a while with these symptoms, then the culpr...

try replacing the dis cap and the dis button and the wires. the prob will be resolved Like your 850, there isn't a distributor or spark plug wires. The white engines of volvo are coil on spark plug, all electronic. The person with the problem needs to do a compression test to rule out a bad valve. ...

What and where are the power stages? Where is the idle speed motor? When it comes to old cars I know how to fix them but these new ones, because of all the computers they are rough to say the least. LOL. I took the throttle body off then took a towel and dried out the manifold. Cranked engine, this...

Try swapping the front and rear power stages. If is a bad power stage then it will move to a different cylinder, one with an even number. Check and make sure the pre heater valve door is set for cool intake air. It is located below the air filter. They can stick in the pre heat position and cause mi...

You may still have some water shorting out spark plugs. Take the intake duct off at the throttle body and open the throttle plate and look down and see if there is still water on the bottom of the ball shape part. Dry it off with long narrow strips of cloth. Then run the engine until it is very warm...

Yes, you can pull the engine out and leave the trans. But even the volvo books show pulling both units at once. The top bolts for the bell housing are tough to get at but I dropped the tail mount bracket on the trans to let the engine tip down for better access, be careful of the rear of the head ag...