Hello all
I am reviving an 81 Monte Carlo T-Top Turbo with automatic tranny. It didn't run when I got it (barn find), opened up top of engine and everything looked great, turbo is tight and spins freely, only bad parts I found were the EGR solenoid (anyone have one?) and the knock sensor (connection was broken off sensor, replaced it with a shiny new $104 replacement). New gaskets, wires, plugs, caps, rotors, rebuild on carb. Now the problem:
If I disconnect the 4 wire connecter from the distributor, it starts great, timing is right on 15 degrees, and it runs weak but it runs down the road. Plumbed a test vacuum/pressure guage into the passenger compartment and its getting up to around 0psi but no real boost - attributed that to the lack of computer control and spark advance.
But if I hook up the 4 wire connector it immediately retards the timing fully (off the scale, can't even see the mark) and it bucks, snorts, even backfires through carb occasionally. Takes a lot of nursing of throttle to even keep it running. Scared to try to even get it into drive with it running this bad!
ECM is not throwing any codes - repeats "12" over and over as long as test connector is jumpered.
I started another thread looking for where the ESC is so I can ohm out the connection to the knock sensor and run through the diagnostic procedure in the shop manual.
I don't know if the car ran when parked, but its in great shape - the interior cleaned up great and the paint even took a shine.
Any ideas? Anyone see this before?
thanks
Dave
I am reviving an 81 Monte Carlo T-Top Turbo with automatic tranny. It didn't run when I got it (barn find), opened up top of engine and everything looked great, turbo is tight and spins freely, only bad parts I found were the EGR solenoid (anyone have one?) and the knock sensor (connection was broken off sensor, replaced it with a shiny new $104 replacement). New gaskets, wires, plugs, caps, rotors, rebuild on carb. Now the problem:
If I disconnect the 4 wire connecter from the distributor, it starts great, timing is right on 15 degrees, and it runs weak but it runs down the road. Plumbed a test vacuum/pressure guage into the passenger compartment and its getting up to around 0psi but no real boost - attributed that to the lack of computer control and spark advance.
But if I hook up the 4 wire connector it immediately retards the timing fully (off the scale, can't even see the mark) and it bucks, snorts, even backfires through carb occasionally. Takes a lot of nursing of throttle to even keep it running. Scared to try to even get it into drive with it running this bad!
ECM is not throwing any codes - repeats "12" over and over as long as test connector is jumpered.
I started another thread looking for where the ESC is so I can ohm out the connection to the knock sensor and run through the diagnostic procedure in the shop manual.
I don't know if the car ran when parked, but its in great shape - the interior cleaned up great and the paint even took a shine.
Any ideas? Anyone see this before?
thanks
Dave