Question about 1994 Volvo 850
Some times the car wont start and when it does start you might be able to run it foe about a week and than you go to start it and it wont go leave it for a few days and it will start cranks over good but wont fire up changed fuel pressure sensor am position sensor had fuel pressure checked can the crank sensor cause this
Not sure on a volvo but it did on my pontiac bonniville
Posted on Jan 04, 2013
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Posted on Jan 02, 2017
SOURCE: my 95 850 t5 wont always start
have you tried testing the coil on the ignition side of things? sometimes coils can have coil windings break and reconnect. have a technician check the primary and secondary coil winding resistance to make sure it is good.
Posted on Jun 17, 2009
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
Posted on Jan 22, 2010
you may want to check the noise suppression relay under the bonnet. A black relay with 4 wires either in front of the coolant tank or by driver side strut.
Posted on Apr 27, 2010
Most likely there is an issue in the fuel delivery system. Probably a fuel pump, however i would check out things like fuel filters, pressure regulators, or pinched or damaged fuel lines before going to the expense and awkward and timly task of replacing the fuel pump which more than likely involves removing the fuel tank. About a 10 hour job if your a DIY, a mechanic in a professional atmosphere can do the job in about 3 hours. Hope this helped!
Posted on May 12, 2010
Hi, if the car suddenly sounds different when cranking, suspect the timing belt has slipped or broken. Possibly your crankshaft sensor was loose or packing up which led to a backfire, which reversed the crank direction and caused the belt to jump. I have pasted directions below from autozone.com on how to remove your timing belt cover if you want to check the belt yourself. The last picture below shows the timing marks on the gears. If the belt is still intact, use a socket on your crankshaft pulley bolt to rotate the engine until the camshaft gears align with their marks. Then check the crankshaft gear at the bottom to see if it is aligned to it's mark. If not, your timing has slipped and you need a new belt. If the belt is bad, I can also supply directions for replacing it. Please let me know if you have questions and thanks for using FixYa. Fig. Fig. 2: Unplug the connector, disconnect the hose and remove the expansion tank Fig. Fig. 3: Remove the belt and the tensioner Fig. Fig. 4: Remove the spark plug cover to ... Fig. Fig. 5: ... access the fuel line clips Fig. Fig. 6: Unfasten the retaining bolts and remove the fuel line clips Fig. Fig. 7: Remove the fenderwell trim Fig. Fig. 8: Remove the water pump pulley; it is retained by a shoulder bolt (shown) Fig. Fig. 9: Remove the retaining bolts and carefully remove the timing belt cover timing marks:
2.3L and 2.4L 5-Cylinder Engines
See Figures 2, 3, 4, 5, 6, 7, 8 and 9
Fig. Fig. 2: Unplug the connector, disconnect the hose and remove the expansion tank
Fig. Fig. 3: Remove the belt and the tensioner
Fig. Fig. 4: Remove the spark plug cover to ...
Fig. Fig. 5: ... access the fuel line clips
Fig. Fig. 6: Unfasten the retaining bolts and remove the fuel line clips
Fig. Fig. 7: Remove the fenderwell trim
Fig. Fig. 8: Remove the water pump pulley; it is retained by a shoulder bolt (shown)
Fig. Fig. 9: Remove the retaining bolts and carefully remove the timing belt cover
Posted on Jan 02, 2011
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