Grand Prix Cranks but wont Start
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Grand Prix Cranks but wont Start
My 1988 Pontiac Grand Prix 2.8 V6cranks but wont start. I checked for spark at the spark plug wire and dont have any. It sounds like the fuel pump kicks in fine when the key is turned to ON and there is gasoline spewing out from the "fuel injector service port" when the needle is pressed in.
Whats the best way to troubleshoot a no-spark condition on these cars? Is it most likely the coil (there are 3), the module or the crankshaft position sensor? Thanks!!
Whats the best way to troubleshoot a no-spark condition on these cars? Is it most likely the coil (there are 3), the module or the crankshaft position sensor? Thanks!!
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most likely cause would be crank position sensor, but you should check and make sure you are getting power to your ignition module first this is the 2 wire connector on the drivers side of the module you should have power at one terminal with the key on and ground at the other terminal.
the coils realy isnt even a possibility cause there is no way all 3 coils would of went bad at once.
the coils realy isnt even a possibility cause there is no way all 3 coils would of went bad at once.
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I cant even find the crank sensor... I guess I have to keep looking. The manual says its pretty easy to replace though. Any ideas?
I pulled one of the coils already cause i wanted to test the module... 2 more to go; its real tight getting to the bottom screws though so i might have to drop the starter?? this is ridiculous!!
I might just replace the crank sensor for $20 and see what happens... ahhhhh.
any comments or ideas would be appreciated!!
I pulled one of the coils already cause i wanted to test the module... 2 more to go; its real tight getting to the bottom screws though so i might have to drop the starter?? this is ridiculous!!
I might just replace the crank sensor for $20 and see what happens... ahhhhh.
any comments or ideas would be appreciated!!
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the crank sensor is on the other side of the block you kinda have to reach between the engine and transmission from underneath the car to get to it just one bolt holds it in just be carefull and try not to break the old one off removing it.
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Joes link to autolibrary has the testing info for the crank sensor.Check for spark on all 3 coils not just one.Also borrow or buy a noid light for your car and see if you have a flashing light during cranking.
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there probably is a resistance for the crank sensor but i didnt see it listed on auto library, a shop would use a lab scope to check for a signal but this is an expensive piece of equipment, another thing you might check is for oil inside the connector of the crank sensor which would mean the sensor is junk and should be replaced, also if you remove the sensor any cracking in the plastic casing and it should get a new one, cracks will allow oil into the sensor.
you might also check the wiring running from the crank sensor to the module for rubbed through spots that would ground out the signal causing a no start all though not a common problem ive seen a few.
you might also check the wiring running from the crank sensor to the module for rubbed through spots that would ground out the signal causing a no start all though not a common problem ive seen a few.
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Thanks, guys... i put in a new crank sensor and it fired right up!
While I was at it, I replaced the spark plugs, wires and air filter. I just have to dress the plug wires neatly now and replace the fuel filter too.
While I was at it, I replaced the spark plugs, wires and air filter. I just have to dress the plug wires neatly now and replace the fuel filter too.