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1998 Oldsmobile 88 c3i ignition voltage

Tiny
AUTORACER
  • MEMBER
  • 1998 OLDSMOBILE 88
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 19,700 MILES
Went through all the steps for testing ignition. Last problem arrived at checking voltage at crank sensor on terminals a and c
should be 9 to 12 mines 5 volts 2nd tried voltage reading at a to ground 5 volts again supposed to be 9 to 12. Doubled check power inputs on pink/black wire 12 volts even tried direct 12 to that wire. Replaced module and coil pack same situation any help would be appreciated. Fuel pressure at 45. Steps taken were from on demand software
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Wednesday, December 10th, 2008 AT 5:25 PM

8 Replies

Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
I'm assuming the vehicle won't start. What is the problem, no spark, no fuel, no injector pulse, or all of them? Please advise.
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Wednesday, December 10th, 2008 AT 6:34 PM
Tiny
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  • 5 POSTS
Fuel pressure good, no injector pulse, no spark and won't start. Car died abrutly and never fired again. Went through steps Cranks but won't start flow chart, and ended on last page with the problem. Thanks
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Wednesday, December 10th, 2008 AT 7:24 PM
Tiny
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  • MEMBER
  • 5 POSTS
Typing to fast, car is 1989 my fault, sorry about that
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Wednesday, December 10th, 2008 AT 7:27 PM
Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
Don't worry about the mistake on the year. If that's thr worst mistake youever make, you've got it made. No pulse and no spark points to the crank position sensor CPS. Changing this is where I would go next and it should pop right off. Let me know.
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Wednesday, December 10th, 2008 AT 7:34 PM
Tiny
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  • 5 POSTS
Crank sensor changed problem's the same.
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Wednesday, December 10th, 2008 AT 7:55 PM
Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
Do you have 12 volts to ground, with key on, at the injector connectors?
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Wednesday, December 10th, 2008 AT 8:43 PM
Tiny
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Checked all injectors for 12 volts yes to all
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Wednesday, December 10th, 2008 AT 8:54 PM
Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
You've obviously done your research, but let me reiterate. The injector and ignition coils are feed hot, 12 volts The ECM "grounds" them to make them fire with the input from the crank position sensor telling it when to fire. What I see from our dialoge is:
1- The ECM is not recieveing the input from the new CPS due to a bad wire or connection somewhere OR
2- The ECM is receiveing the CPS signal and is not processing the information. Bottom line, bad wiring or bad ECM. If I'm missing something here, let me know.
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Wednesday, December 10th, 2008 AT 10:57 PM

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