Question about Cars & Trucks
Check wirering to crank sensor and all plugs check ignition modual if it is fitted with coil ballast's check starter relay
Posted on Dec 30, 2013
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Posted on Jan 02, 2017
SOURCE: 1985 Volvo 240 no fuel no spark
well first the fuel pump relay is bad, that is easily replaced. next you have no spark. the first thing you do is take the cap off the distributerand crank the engine. if it spins that tell syou thyat at least the tang or gear on the shaft of the distributor is ok and not broken. next thing is remove the #1 plug and use a 1/4 drive extension 6" long and turn the crank by hand until the #1 cylinder is top dead center(put the extension in the hole of head where the plug was and you should feel the top of the piston also make sure you can feel the top of the piston with half the extension this way you don't drop it in the cylinder with the piston at TDC(top dead center) the rotor of the distributor should be pointed at the #1 firing position. IF it does not that means your timing is off and you need to retime it by taking off timing cover and either replacing the belt/chain or gears. now if you do not have a distributor and you have a coil pack there could be only 2 things that won't give spark. either a bad coil or your altenater is bad(the battery is responsible for starting not running the vehicle like alot of people assume. the altenator energizes the coil which inturngives spark. hope this helps you please rate this thanks
Posted on Sep 07, 2008
check your crank angle sensor when they go bad you will get no spark.at first when they go bad it will be intermittent.its a heat related problem,when the car warms up the sensor will cause a open circuite,then when it cools down it will start again.remove it from the car and hook your volt meter to ohms and place the leads on the end of the sensor it will show continuity,while the meter is on hit the sensor with a heat gun till warm if bad it will show an open loop when hot if so replace.
Posted on Aug 25, 2009
SOURCE: I have a 2004 Mercedes
A common cause of this problem is a defective fuel pump check valve, hook up a fuel pressure gauge to the fuel rail test port and verify there are no leaks, start the engine and let it run until the fuel pressure is steady, then shut it off the fuel pressure should remain within 5 PSI of the running reading, if not then the fuel pumps built in check valve is defective. The reason this causes hard starting is the fuel drains out of the line due to the defective check valve, when you start you get air to the injectors for a second, this causes rough running and a stall in some cases, 2nd restart in most cases is ok. Do the leak down test and let me know the test results.
Posted on Aug 15, 2011
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