Question about 1994 Volvo 850

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1994 volvo 850 wont start

I have a 1994 volvo 850 sportwagon non-turbo. I can only use this car if i either bump start it by parking it on a hill or tow starting it.
The engine turns over with the starter motor and is spinning fast enough for it to start. I have fitted 5 New spark plugs, changed the fuel filter and cleaned the mass air flow sensor with brake cleaner. The MAF is giving me a reading of 110 ohms over a coulpe of the the terminals. But i cant find out if this is the correct resistance, have tried to search on the net but no joy.

I am 100% sure that the fuel pump is fully functional and that im getting enough pressure to the injector rail, and that all of the injectors are working correctly.

Once the car starts it goes like a dream its just getting it started.

Any help would be much appreciated

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  • icedragon240 Feb 06, 2010

    Thanks, You have just made something click, this car has done 360kms, plus prob. Could the cylnders just be a bit tiered?


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Well if the engine is turning over while trying to start but won't, going to have to start with the basics. If the engine light is on when she does run check for codes and see what they are and repost or have someone look at it with a scan tool at a garage. If no codes are present or none that are relavent then Start by checking the spark to the plugs with a spark tester, the adjustable gap kind are best but inline would be ok. if you got spark, check for fuel while cranking of course, (you could smell it out the tail pipe), or remove plugs and see a small spray coming out as the engine is cranking (be careful with this as these are not appropriate tests and you are dealing with fuel, explosive and dangerous to breathe). Don't crank too much as this can wash the cylinders down. if the cylinders get washed down you will need to put some oil in each cylinder just a little, to rebuild compression. If fuel is present in the cylinders while cranking, and you say you have good fuel pressure then will need to ensure compression and timing, and if all these are good, you will have to check for problems with wiring and electronically controlled grounds, etc. You may want to seek some help on these if you are unsure how to continue on with voltage drop tests, and resistance, but maybe you can. I hope this helps and if you have anymore info on the vehicle like test values etc, or need more help, just post back. good luck

Posted on Feb 06, 2010

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