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


Backfires usually caused either by timing or spark jumping issue, or, lean fuel mix. Might try starting at night with helper cranking and you look under hood (dark) for stray spark. Lean could be several things--coolant sensor, IAC stuck, bad converter or muffler, vacuum leaks, even leaking injector allowing excess fuel to drip into cylinder (I know, I said lean, but this can do it also)

Feb 02, 2015 | Fiat Cars & Trucks

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Car not starting


Fuel, spark and air. You are missing one of them you need to test for spark ,and fuel crank the engine then go to the fuel injector rail on the rail is a cap remove the cap and you will see a shrader valve just like your tire valve stem use a pointy object like a screw driver and press does fuel come out if it just dribble out well you need to test for fuel pressure. Better yet have someone crank the vehicle and you should be able to hear the fuel pump get activated you you do trouble shoot for spark. Your system uses a crank sensor it that crank sensor fails you get no spark. or even the ignition module may have failed pull one of the plug wires let it touch body ground about 1/4 inches away have some one crank it you should see spark jump out. if you dont troubleshoot for no spark condition

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Floods. Won't start. Cranks fine. Small popping (maybe backfiring) heard. Only happens when engine is cold (ie staying out all night).


pickup coil in the distibitor bad or if tbi or multiport
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Feb 24, 2010 | 1992 Oldsmobile Cutlass Ciera

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93 volvo 850 glt changed the fuel pump now car wont start. Engine cranks, fuel pump working, fuel getting to the motor but it wont start. The car had trouble starting sometimes so i changed the fuel...


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 Fixya.com

Jan 22, 2010 | 1994 Volvo 850

2 Answers

Engine just turns and turns. I let it sit for a


do a code search it can be found on yahoo for your car failing that borow a code reader from local rentel shop they are usually 10 = 30 per day and worth the money

Jan 16, 2010 | 1992 Oldsmobile Cutlass Ciera

1 Answer

Engine will turn over but will not start running


start with the basics check for fuel fire and air check fuel peressure with a gauge should be 50 - 65psi
pull spark plug wire and place near ground if no spark in crank sensor or coil pack ensure air filter is cleaned

on fuel pressure if low check fuel filter pump may be working and cant get to fuel rail but could have damaged pump the fuel pump is controlled via crank sensor signal so no crank sensor signal no fuel

Jan 15, 2010 | 1999 Plymouth Breeze

1 Answer

I have a 1991 740 volvo, was driving down he street and it died,after i pulled over it wouldn't start


Check if you still getting fuel and sparks, two items need to keep the car running. Check fuses and fuel pump relay, if needing new relays go to the junk yard and get couple of them for nothing. Checking making sure you getting fuel and fuel pump working properly, unplug the the main coil wire to distributor so the car wont start we just want the engine just to turn over. under the hood, locate fuel filter, disconnect the line to or from it, wrap the bottom of the hose with old clothe firmly and to remember to point the house downward away from your face so it wont splash at you. and have a friend turn ignition over just like starting, see if the fuel come out with good pressure. if fuses and relay check out, your crank sensor may be bad, being 91' strong possibility. crank sensor send info to computer telling to send fuel to your injectors. For sparks, make sure you plug the main wire to distributor back. pull one plug wire and get spare plug, plug it and ground the plug and have a friend turn the engine over and see if you getting sparks, do not touch the plug, big shock. No sparks, check the coil if you getting 12v, if yes, than your cam sensor is faulty. The cam sensor work just like the crank sensor but telling the computer to send sparks to the distributor. Common for older European cars, crank and cam sensor tend to become faulty after years of service due to age and heat abuse.

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89 honda civic swap car wont start


Backfires usually mean it's still out of time, either engine wise, spark wise, or injector wise. I'd pull the cap and inspect the ignition coil if it's that style. Hondas are the easiest cars to get spark plug wires mixed up, even the pros do it every so often. I'd also make sure all your injector connectors aren't swapped around, & definitely check all of your engine grounds. you could also have a bad timing belt tensioner or just be a few teeth off. I always triple check the simple stuff over and over again cuz thats what it usually ends up being... hope this info helps...(subytech1)...

Aug 07, 2009 | 1995 Honda Civic

2 Answers

No start


Usually is the crank sensor. If you need to be sure, you should have 5V signal wire, ground wire, and a 5V supply wire. Make sure you have 5V, and ground. If you do, replace the sensor.

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