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2000 Mercury Mystique Repair Question


Topics covered: Fuel pump, Spark, Engine.
Mileage: No information provided.

Asked on December 11, 2011

2000 mercury mystique turns over but will not start. seem to have this problem only on colder nights. why is that?

Have had trouble recently with car not starting on cooler days. it will turn over but not start. have had starter, alternator and battery tested. all came back good. do not want to put in shop because it is my only means of transportation. need quick and inexpensive fix.
Avatar Asked by momma_shelton74

Answer

Replied on December 11, 2011

Rain or Shine do below

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if okay-check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs,coil's resistances,cap and rotor,distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it and keep testing

Tiny Answered by rasmataz
68 questions asked
Replied on December 11, 2011

it doesnt appear to be fuel pump. can hear a slight hum. have reason to believe it is indeed the ignition module. on warmer days it does crank. it seems as if it has a mind of its own

Tiny Response from momma_shelton74
1 question asked
Replied on December 11, 2011

If its the ICM don't matter cooler or hotter days it will not start

Tiny Answered by rasmataz
68 questions asked