I recently purchased a stock 89 5.0 LX that according to the owner would not stay on due to some minor air leaks. When I would turn the key on it would start but shut off sounding as if too much fuel was being delivered. I asked if the fuel pump was bad, he said it had a new 90lb. I replaced all the upper intake gaskets and hoses, nothing. Cleaned the IAC, removed the plugs which were black and covered in gas. The other night I tried starting it again and with the petal to the floor It would not go further than 1000rpm, but when I removed the sensor for the mass air it would go past that and still try to shut off. As long as I was pumping the gas it tried to stay on, did this for about 5 min. The strange thing was the headers were cold. He mentioned that he had a GT40 upper and lower intake, could they have put the lower intake on wrong. Anyone have any suggestions?
Mustang won't run.....
- Thread starter Diablo89
- Start date
TO me it sounds like you might be getting way too much fuel. Were all the plugs covered in gas or was it just some of them? When I put my GT 40 intake on I accidentally pinched some of the wiring harnesses to the injectors on the drivers side under the upper intake. Basically it turned the injectors on all the time and loaded the car up with fuel. You might want to take a look at that. On mine the injectors weren't rotated back to the fuel rail and were pinched by the vacuum manifold on the underside of the upper intake. I would also put some new plugs in there as well and take a look at the fuel pressure. Most of this advice just comes from personal experience hope that it helps
Similar threads
