Question about 1994 Volvo 850

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Volvo crank sensor. Car gets spark, gass, and air but will not start. turns over but not even s sputer pop or backfire. if i ground out a pulled pug while still wired to the distibutor there is a spark , not hug but a small blueish white spark. how can I test the many sensors i have buoght a the junk yards.

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If you are getting fuel air and spark to the combustion Chambers then the crank sensor is doing it's job.possible fuel washed cylinders not allowing enough internal compression to ignite the fuel.Remove about 4 plugs and squirt a little oil down in each cylinder and let sit for a moment.Turn the engine over several times with the plugs out,clean the spark plugs,re-install and see what happens.
Hope this helps your concern,
Kenneth R.

Posted on Oct 08, 2010


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Hi Fiat palio 1.2mpi car backfire on crank but start what can it be please can Anyone help

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Check your fuel pressure to ensure proper pressure to the block, also did you replace the fuel filter.

On a side note: 3 things a automobile needs to run

AIR-make sure you have a clean air filter and your MAF (mass air flow sensor is plugged in) if you pulled your breather to innspect anything, there is a possibility that it came unplugged or you unpluged it and forgot to hook it back up, a car wont start without it being plugged in if equiped

SPARK-Make sure your car has juice to the plugs, if the plug doesnt fire the car wont run, if you have to pull each plug and ground them to the engine block to see if they arch. If not trace the problem down (if you changed the fuel pump you have some mechanical skill and should be able to troubleshoot a spark issue)

FUEL-Check for proper pressure, dirty fuel filter(s) and if your system has a return line, make sure your hoses didnt get crossed cause this will damage the engine and regulator.

Hope this helps Thanks for using

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