1991 Other Audi Models Trouble starting

1991 AUDI
167,000 MILES • V8 • AWD • AUTOMATIC
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SIMMS2424
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My 1991 Audi v8 Quattro is having trouble starting after the car has been running for a little while. I replaced the ignition coil and i also replaced the caps & rotors but it did not solve the problem. Any suggestions?
May 30, 2010 at 11:59 AM
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RASMATAZ
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Do below to determine if its fuel or spark problem

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, 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
May 30, 2010 at 3:15 PM