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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21875
Experience:  BEng hons Mech engineering, in auto industry 22 years
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my car will not fire, engine turns over but not start?

Customer Question

my car will not fire, engine turns over but not start?
Submitted: 2 years ago.
Category: Car
Expert:  Matt replied 2 years ago.
Hello

1st check for spark by removing one of the spark plugs and plug it back into its coil and rest it on the metal of the engine ( DO NOT hold it on place by hand) then have your assistant turn the engine over whilst you watch the plug. It should give a fat blue spark at regular intervals.

If not then check that there's power to the coil pack using a meter. If there’s 12V at the pack but no spark then check the ECU power supply (fuse and relay) and also the connections to the crankshaft speed sensor.

If there is a spark and its still not starting then its likely that the ECU isn't opening the fuel injectors, if the injectors are working you can hear them click - its difficult to hear them with background noise so use a long screwdriver like a stethoscope, placing the handle end in your ear and the metal tip against the body of the injector whilst your assistant turns the engine over.

If you can't hear anything check the ECU power is present by measuring voltage at the fusebox and on its relay socket if OK then check the connections to the crank speed sensor and consider replacing this sensor if the wiring / connections look OK

If the car will start using a squirt of quick/ easi start into the intake then this confirms the problem is lack of fuel