My 1993 300D 2.5 ran fine Friday. Got in Monday morning and turned the key and noticed the gp light never came on - uh oh! Tried to crank it and it turns over fine but did not fire. White smoke is trickling out the exhaust after a bit of cranking. I replaced all the gp's about 4 months ago so I suspect they are fine. I am suspecting the relay is bad. Is this a reasonable suspicion and if so would that prevent the rig from starting on a reasonably warm morning? Now, if so how do I test this thing. I know the older ones have a strip fuse but when I changed the gp's I noticed my box didn't have any externally (with cover off of course) visible fuse. Is there anything else that would cause these symptoms. Thoughts please!!!! Many thanks in advance.

Time to take out the multimeter. Check the voltage at the plugs and at the relay, its a good place to start. I would suspect the GPR as well since it is unlikely that all the new plugs would go bad at once. If you want to pull one of the plugs and hook it up to the battery directly it should glow bright orange, verifying that the plugs are okay.

I have heard from others on this forum that a common symptom of the GPR can be correct voltage but not enough current to glow, so the voltmeter setting would be accurate but not enough juice to toast up the plugs.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth