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Old October 15th, 2002, 20:12   #7
Join Date: Jan 2002
Location: West Lafayette, Ohio
Default Re: Hard starting when WARM!

Voltage drop test and amp draw test does not show a failure on this starter problem, the best way to prove it is with the VAG-COMM software. Disconnect the fuel solenoid and check the cranking RPM. You need at least 300 rpm, a good starter with good battery will get around 350 rpm, a bad starter is around 250 rpm.

I know this sounds a little odd, and the starter will sound like it is fine, but if the RPM's are not there it will not start right. The difference on the cold start is the glow plugs are activated and there is an enrichment valve in the pump that gives it more fuel on cold starts, also the timing is advanced .

Another thing to try is disconnect the ECT sensor on the warm engine and see if it starts eaisier.
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