Mechanics

4TH CYLINDER WON'T FIRE

1987 Toyota MR2

Engine problem
1987 Toyota MR2 4 cyl Two Wheel Drive Manual 150000 miles

I cannot get the 4th cylinder to fire. It has good compretion, and there was a leak at the intake, but I have fixed that, but still cannot get that cylinder to fire. When I remove the spark plug wire the engine continues to run, with no noticable change. The car has no power at all, I have to push the pedal all the way to the floor to make the car move at all. The spark plug works, I have moved it and tested it and it works fine, I have also checked the wire, and tested it, the fuel rail is also functioning, and is expressing fuel, so I am at a loss as to what else could be wrong.
Avatar
Skplatinum
January 18, 2008.



Hi there,

Attach a vacuum gauge to the engine and take a reading at idle, post your findings.

Mark (mhpautos)

Mhpautos
Jan 19, 2008.