I have been having issues with bucking and backfiring above 2,000 RPMs at cruising speed in my 88 Comanche 4.0l. After replacing and fixing a number of parts I've narrowed the problem down to the ignition. I test the coil and stator and both seemed fine. I wasn't confident in the stator test because it didn't have a range of spec values, so I disconnected the stator and took the truck for a drive. It ran the the same way it did with it connected. Is it safe to assume that is is bad?
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Stator? Bucking and Backfiring
- Thread starter Carone
- Start date
joe_peters
NAXJA Forum User
- Location
- Grants Pass, OryGun
Well, without the stator connected the ECU is not receiving a signal to synchronize the injectors.
The question is, is it the sensor itself or the wiring?
The question is, is it the sensor itself or the wiring?
birchlakeXJ
NAXJA Forum User
- Location
- Melrose, MN
How did you eliminate fuel delivery as a possible root cause? Comprehensive fuel testing I think would be in order here....
JJacobs
NAXJA Forum User
- Location
- Fort Collins CO
Have you tried to turn the rotor by hand? Should only be a couple degrees of movement. Sometimes the roll pin holding the gear to the shaft will come apart and give these symptoms.
JJacobs
NAXJA Forum User
- Location
- Fort Collins CO
Not much at all. The rotor is mechanically locked to the drive gear down at the bottom, so you'll only have the tolerance stackup of the rotor/shaft interface plus the freeplay between the cam gear and distributor gear. It should not be able to move anywhere near as much as an old school mechanical advance distributor.
tugalo
NAXJA Forum User
- Location
- easley, sc
Check your manifold air temp sensor..if it leans out the mixture, it will do just as yours is.
