1997 Audi A4 won't start at times

1997 AUDI A4
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BART BLUE
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Engine Mechanical problem
1997 Audi A4 6 cyl All Wheel Drive Automatic 90k miles

engine turns over but won't start on occasion. come back a couple hrs later and it starts, runs fine. changed fuel filter and plugs...runs good but then wouldn't start again a couple days later. same thing, give it a couple hrs and no problem.
Mar 1, 2010 at 11:22 AM
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RASMATAZ
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Do below to determine if it's fuel or spark problem.

Cranks but no start condition:

Fuel and Spark:
Get a helper disconnect a sparkplug wire or 2 and ground it to the engine at least 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, 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,distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it.
Mar 1, 2010 at 5:35 PM
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