I have just finished putting a 91 motor into my 86GT. The motor is bone stock save for longtube headers. Now the problem is that I have a bad miss on cylinders 1, 2, 6 and 8, it is so bad that the paint on the new headers on these cylinders is still black and has turned light gray on cylinders 3, 4, 5 and 7. I hooked a timing light to each individual plug wire and you can visibly see that there is a very bad miss, sometimes it will only fire once every few seconds. I have tried changing TFI modules, distributors, cap, rotor and still nothing. I am very puzzled because of how dramatic the difference is between the cylinders that are firing and those that are missing. After running for a few minutes you can grab the header tubes that are missing while those that are firing are burning hot.
Also there is a random orange wire near the back of the intake, where should it be going?
The car still has the stock wiring harness, computer and speed density setup.
Can someone please help? I am thinking that the next step may be to change the computer? Bad ground somewhere? ANY suggestions would be greatly appreciated!
Also there is a random orange wire near the back of the intake, where should it be going?
The car still has the stock wiring harness, computer and speed density setup.
Can someone please help? I am thinking that the next step may be to change the computer? Bad ground somewhere? ANY suggestions would be greatly appreciated!