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hard start and pwm ground??
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Posted by Smeter [Email] (more from Smeter) on Mon, 2 Jul 2007 17:02:19 Share Post by Email
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I have a 2000 9-5 lpt with a 2.3l 4 cylinder auto which I recently did a head job on.

Lately, the car is a hard start when the engine is cold. When starting it cold, the car will start up and then die. Then, I have to start it 2-3 more times before idle will be established. Even on the 4th start, the engine rpm is low as the car is sputtering and then finally the idle stabilizes and the car runs. The weird thing is - once the coolant temperature is warmed up (i.e. the car is warmed up) the car runs fine. You can bring it to red line and there are no perfermance issues as you throttle on and off the gas at any speed/rpm.

Seeing that I did the head job, I thought maybe I did something wrong (as the car ran properly before the head job with no cold start issues). Trying to re-trace my steps during the head job, I remembered that I forgot to take the ground wire off the intake manifold (yes...I believe in taking the intake manifold off with the head... I hate getting at the lower bolts of the intake while the intake is in the car) and gave it a tug as the head was coming out. Today I tried to confirm that the ground screwed to the intake manifold was okay. However, putting a test light and multimeter on black ground wire (fyi - I isolated the ground wire by unscrewing it from the intake) gave me no light on the test light and didn't give me any DC volt reading on my multimeter. However, the other ground (attached to the lifting eye by cylinder #4) gave light on the test light as well as a voltage reading. So the question I have is - did I rip the ground wire so bad that it no longer can function as a ground wire? Or, do I need some type of LED light (like you need when you are trying to determine if wiring to a fuel injector is working) to test this ground because it is part of a pulse width modulation (PWM) circuit?

As always.. any thoughts would be appreciated.



posted by 72.138.93...

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