2000 GMC Jimmy No spark

Tiny
FIREFIGHTER241154
  • MEMBER
  • 2000 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 213,000 MILES
Just replaced intake manifod gasket on jimmy Pu all back togather and wont start. No spark at bank 1 or at coil. We have replaced coil, cap, rotor, duistributor, ignition control module tested as good any suggestion would be greatly appreciated thanks
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Tuesday, December 9th, 2008 AT 2:55 PM

3 Replies

Tiny
JDL
  • EXPERT
I'd check the small primary wire circuits that go to the coil. Two wire connector, Pink wire goes hot when you turn on the key, the other is ground, should be a pulse on the ground with the engine cranking. You can take the connector loose, use an led testlite between the two terminals, crank the engine, see how the testlite reacts.

I can't tell if your repair work might have caused a problem? Is there an rpm signal? Any codes? With the engine cranking is there good fuel pressure and injector pulse?
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Tuesday, December 9th, 2008 AT 3:35 PM
Tiny
FIREFIGHTER241154
  • MEMBER
What do you mean by RPM signal? No codes when cranking. The fuel pressure was fine before rpairs, and how would I check for the impulse? Thanks
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Tuesday, December 9th, 2008 AT 5:24 PM
Tiny
JDL
  • EXPERT
Did you check the primary circuits going to the coil? What did you find?

The rpm signal comes from the crank sensor. If your using scanner that will show live engine data, it should show an rpm signal, with the engine cranking. Without that signal you get no injector pulse, the fuel pump relay won't energize other than the initial prime, and I don't believe you'll have any spark. Don't replace the crank sensor without doing some basic tests on the other systems.

I can't tell if some of your repair work might have caused a problem?
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Wednesday, December 10th, 2008 AT 4:54 PM

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