torque lock issues
#12
01-03-2012, 05:56 PM
Originally Posted by Captain Hook
...Have you checked fuel pressure and leakdown? Have you checked camshaft retard? Did you perform the crankshaft position sensor relearn? This is mandatory with an engine change. If it's not done, the PCM uses data from the old engine.
What are the results of these suggestions?
#13
01-03-2012, 06:12 PM
Originally Posted by Captain Hook
What are the results of these suggestions?
#14
01-03-2012, 06:41 PM
Could be any number of things; poor or loose connection, weak or failing pump or pump motor, check valve sticking in the pump at times, etc etc.
Key on, engine off, fuel pump running, pressure must be 60psi to 66psi and must remain above 55psi for 10 minutes after the pump shuts off.
Key on, engine off, fuel pump running, pressure must be 60psi to 66psi and must remain above 55psi for 10 minutes after the pump shuts off.
#16
01-03-2012, 08:29 PM
At this point we don't know what it is. Throwing parts at it without proper diagnosis gets expensive, (unless you're a good guesser) 
Fuel delivery is critical on these engines and checking the fuel pressure and leakdown rate are quick, simple and free tests, (if you have a tester). The results will either eliminate several possibilities, or point to a problem.
Fuel delivery is critical on these engines and checking the fuel pressure and leakdown rate are quick, simple and free tests, (if you have a tester). The results will either eliminate several possibilities, or point to a problem.
#17
01-03-2012, 09:09 PM
Originally Posted by Captain Hook
At this point we don't know what it is. Throwing parts at it without proper diagnosis gets expensive, (unless you're a good guesser) Fuel delivery is critical on these engines and checking the fuel pressure and leakdown rate are quick, simple and free tests, (if you have a tester). The results will either eliminate several possibilities, or point to a problem.
Fuel delivery is critical on these engines and checking the fuel pressure and leakdown rate are quick, simple and free tests, (if you have a tester). The results will either eliminate several possibilities, or point to a problem.
#18
01-05-2012, 09:57 PM
Alright so I got word from the shop.. There is a multiple cylinder misfire going on. Mainly cylinder 4 and also 1 and 3. I am thinking now its the distributor. All ignition parts have been done with the exception of that.
the fuel pressure test was good they said and held good pressure. not sure what it was.
the fuel pressure test was good they said and held good pressure. not sure what it was.
#19
01-06-2012, 04:51 PM
Worn bushings can definitely cause random misfires, (P0300). If the shop has an oscilloscope, they can spot worn bushings immediately. Secondary ignition, roster, it sticks out like a sore thumb! If the distributor housing is black plastic, it's very possible that the bushings are worn, very common problem. Several aftermarket manufacturers now use aluminum housings, a much better design. Most all of them come with the CMP sensor and distributor cap and rotor. Use your AC Delco cap & rotor though.
#20
01-06-2012, 07:24 PM
Originally Posted by Captain Hook
Worn bushings can definitely cause random misfires, (P0300). If the shop has an oscilloscope, they can spot worn bushings immediately. Secondary ignition, roster, it sticks out like a sore thumb! If the distributor housing is black plastic, it's very possible that the bushings are worn, very common problem. Several aftermarket manufacturers now use aluminum housings, a much better design. Most all of them come with the CMP sensor and distributor cap and rotor. Use your AC Delco cap & rotor though.
Alright i will let them know! Thanks for all the info on this youve been a huge help. will keep you updated
