- Aug 24, 2012
- 1,098
I'm not sure if any of you saw my post in the full-size forum about a GMC C1500 4.3 I sold that had misfire issues when the humidity was high or not, but my TB has been doing it, too. It isn't always the same cylinder. The first time I noticed, Torque showed Cylinder 2 not playing well with the others. The next time it was either 2 or 4, and this time (we had a 3 day rainy period) it was #4 that was basically not firing at all. In a 3 mile trip, there were almost 10,000 misfires. It will set the code just about every time I drive it on these short trips to work or family visits. Today, it is less humid, so I should have no issue driving it (haven't even started it, but basing it on past experience).
Since these have individual coils, I'm planning on starting with a plug/wire change and use dielectric grease in everything when I put it back together and see what happens. On the C1500, the fix was to replace the coil. Since this one is moving, I don't think it is one particular item, but maybe more of a sealing fix. We'll see...
Since these have individual coils, I'm planning on starting with a plug/wire change and use dielectric grease in everything when I put it back together and see what happens. On the C1500, the fix was to replace the coil. Since this one is moving, I don't think it is one particular item, but maybe more of a sealing fix. We'll see...