QuestionQUESTION: Car does not want to start. It gets close in starting, but no cigar. I've changed egr valve and solenoid. I also put in a new throttle positioning sensor. Tune up done. Engine cleaned of carbon. Repositioned Distributor cap. I'm thinking head gasket or bad rings. Can you help?
ANSWER: Cam timing? Could it have jumped at the timing belt? Have you checked compression? What about a leak down test?
scotty
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QUESTION: Checked Compression and timing belt and cam timing. All are well. We changed Head gasket still same problem. We are now looking at possibly the distributor neck. We have spark and it is blue, but it is a weak blue. We have gas as well. Maybe spark is not strong enough to ignite fuel, possibly. In all, we have gas,compression and spark. What else could it be?
ANSWER: A flooded motor sometimes will not start until the oil is changed,and the plugs are replaced I assume the spark is roughly correct as to timing. What about plug wire resistance? What is the actual voltage at the coil? There are inexpensive testers for that.
scotty
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QUESTION: How can you tell if a fuel pressure regulator is bad?
AnswerThere's usually a port on the injector log(the transverse pipe that supplies the injectors with pressurized fuel). measure the pressure with an appropriate gauge. Usually the pressure regulator has a hose that connects to the vacuum of the intake manifold to change pressure according to engine load. Low vacuum - higher pressure, high vacuum - lower pressure. This is to ensure that the pressure difference between the manifold and the pressure supply remains constant. Just connect the gauge, run the fuel pump (crank the motor) and see if the pressure is within specs.
scotty
