jim928
11-28-2011, 01:29 AM
Hi everyone, first time posting here.
Two years ago I bought a DeLorean with 17,000 miles, that was sitting for about 6 years and it had some hesitation and starting issues. Last summer I dropped the fuel tank and installed a new fuel pump, fuel accumulator, fuel filter and new fuel injectors. This fixed the hard starting problems but there still was the popping and hesitation issues if I pressed the accelerator too much. If driven easy it would not pop. The car also idled fine too. I put about 1500 miles on it this way. This past month I decided to finally tackle the hesitation issue and popping. I found that the plunger on the fuel distributor did not move freely and would get hung up so I swapped it out with rebuilt unit from Python injection. The rebuilt unit moves as smooth as silk. I also replaced all the fuel lines with stainless steel braided ones that are available on Special T Auto. To rule out any vacuum leaks I replaced all vacuum lines, gaskets, rubber seals and o rings on the intake manifold and mixture control unit. So after all this work done my new problem is the sensor plate on the mixture control unit does not move! The vacuum of the engine can't suck the plate down. It feels like the fuel pressure inside the fuel distributor is pushing the plunger down which keeps the sensor plate from dropping when rpms increase. Car will not hold an idle on its own but when the sensor plate is manually moved in conjunction to the position of the throttle the engine runs amazing and is super responsive. To me it feels like there too much pressure inside the fuel distributor. Has anyone come across this issue before?
Two years ago I bought a DeLorean with 17,000 miles, that was sitting for about 6 years and it had some hesitation and starting issues. Last summer I dropped the fuel tank and installed a new fuel pump, fuel accumulator, fuel filter and new fuel injectors. This fixed the hard starting problems but there still was the popping and hesitation issues if I pressed the accelerator too much. If driven easy it would not pop. The car also idled fine too. I put about 1500 miles on it this way. This past month I decided to finally tackle the hesitation issue and popping. I found that the plunger on the fuel distributor did not move freely and would get hung up so I swapped it out with rebuilt unit from Python injection. The rebuilt unit moves as smooth as silk. I also replaced all the fuel lines with stainless steel braided ones that are available on Special T Auto. To rule out any vacuum leaks I replaced all vacuum lines, gaskets, rubber seals and o rings on the intake manifold and mixture control unit. So after all this work done my new problem is the sensor plate on the mixture control unit does not move! The vacuum of the engine can't suck the plate down. It feels like the fuel pressure inside the fuel distributor is pushing the plunger down which keeps the sensor plate from dropping when rpms increase. Car will not hold an idle on its own but when the sensor plate is manually moved in conjunction to the position of the throttle the engine runs amazing and is super responsive. To me it feels like there too much pressure inside the fuel distributor. Has anyone come across this issue before?