Pontiac Repair Questions? Ask a Mechanic for Answers ASAP
My name is XXXXX XXXXX I will be happy to try and assist you.
When you crank the engine can you tell me if the tachometer bounces a little only while cranking?
No problem, once you return I have a feeling its going to be a bad crank sensor so will await your reply.
Can you also explain how you found that you do not have power to the fuel pump?
The pump should not matter what have a 3 sec prime when the key is turned on then no power....... Until you crank or delay with key off then key on 3 sec prime again, when are you showing no power at pump, key on engine off or key on engine cranking?
It could be that either system is already under the prime and delay for reset has not been reset yet to allow new 3 sec prime, or could be that the event takes place so fast that the voltage is applied and removed so fast that the meter does not show it, at the same time it could actually be a problem with the system, the lack of tach signal is telling me that there is a problem usually resulting from the crank sensor being faulty, when complete functional system is working during cranking you should be able to see the tach slightly bounce indicating a tach signal, while this is not always conclusive so long as the tach is correctly working then it is usually a good indication of such.
The best thing to do in this situation to aid in the diganosis is connecting a full scan tool to it, not one that just does codes, you need to connect a full diagnostic scan tool to it, this way you can evaluate the peramiters and you can also check for crank signal which comes from the crank sensor.....
At such time evaluate the power to the fuel pump as well.....
I explained that the car needs to be connected to a diagnositc scan tool to diagnose the problem, I also explained that there is a lack of crank signal since the tach does not move such as if the tach works, this could mean in that wiring circuit or ecu related as well this is the entire reason the car needs to be connected to a diagnostic tool.
There are lots of diagnostic tools to use and thus far I don't see any that have been used, you have explained that there is no fuel pressure yet you have not indicated if you used a fuel pressure tester or if you just opened a line, you havent told me if you have used a voltmeter at the pump either. Theres a very strong chance that you are not getting fuel due to other things...... A scan tool again needs to be connected to the vehicle, no matter how much people don't want to take their car to a shop it needs to be done for proper diagnosis otherwise people guess and just throw parts at something they don't need. Theres no reason to replace any crank sensor either until they where tested and evaluated with the tool. Electronic parts are non-returnable......