1999 Pontiac Grand Prix

Tiny
MDLADY3
  • MEMBER
  • 1999 PONTIAC GRAND PRIX
Electrical problem
1999 Pontiac Grand Prix 6 cyl Two Wheel Drive Automatic

car wont stay running change fuel pump and crankshaft sensor and had ign module tested
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Wednesday, November 11th, 2009 AT 6:24 PM

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Tiny
SERVICE WRITER
  • EXPERT
Were any of those parts mentioned bad?

Did you change the fuel filter when you did the pump?

What is the fuel pressure when the symptoms happen?

What is common when the symptoms start?
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Wednesday, November 11th, 2009 AT 6:35 PM
Tiny
MDLADY3
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Fuel filter was change with new fuel pump and crank shaft sensor just change it put factory gm crank sensor back in fuel pressure test is 52lbs had ign module tested 3 times it is good it just cuts off wont start back up for day and then start up next day and runs runs for a day or runs a block and shuts off no signs that it is going to shut off
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Wednesday, November 11th, 2009 AT 7:27 PM
Tiny
SERVICE WRITER
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This one can be a bugger, but here are my thoughts and some things to consider.

I assume this is the 3.8 engine, otherwise the fuel pressure is too high.

You'll need to do testing when the no start is happening.
Was the module tested when the failure was present?

When the no start is present, check for spark and for injector pulse. Check the wiring from the crank sensor to the ignition module. It might be chafing against the block or evap lines. Wiring can not only chaff but coolant, Oil, etc. Can break down the insulation under the tape. Pull them out of the tape and check them. Maybe when it dies you might be able to determine if the spark and injector pulse both fail then it might be in the crank sensor, module area. If injector pulse only fails, then it might steer you towards ecm. I know you replaced the crank sensor with a GM one and it is probably fine. All too often I have found the new parts do not always mean good parts.

Also, check ground connection underneath ign coil assy & ign connectors for loose connections. Check positive cable connection at the power distribution center to be clean & tight. Check ground connection below pdc.

I have run into Ignition switch intermittent issues on these.

Sometimes a Mass Air Flow sensor will also do this but it would usually show up in a tap/wiggle test. You can do this test with or wthout the symtom present.
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Thursday, November 12th, 2009 AT 4:39 AM

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