Fuel Injection repair on GMC Jimmy?

[Mary Cole]

Could be the problem I am having with a misfire. Is this an expensive repair? Only misfire on one cylinder.

 

[dick car guy]

what year is the jimmy? this is actually not that common for the tbi or throttle body injection. Have you isolated which cylinder? then pulled the spark plug? 2.00 dollar plugs go bad sometimes. What kind of fuel do you buy? If you buy the cheapest fuel available that is more than likely the problem. El cheapo gas is contaminated with all kinds of crap, including water, and it can over time let hardened deposits build up in places you do not want them, like small openings in injectors. I ran super unleaded chevron in all my vehicles, the techron inside of good clean fuel helps keep the inside of the engine clean, in the 12 plus years I have used a good quality fuel I have not had to go to my mechanic and get the injection system flushed out. Clean oil, clean air filter, and a good tune up are the best things you can do for an engine.And as expensive as a mechanics shop is now, I would rather pay a few extra cents a gallon now, than a whole lot of money later trying to clean out something, that I could have kept clean in the first place.
And at 20 cents a gallon? that is 20 dollars for every hundred gallons, or 7 gallons of gas (but good gas) the math does not lie, its cheaper to use a good quality fuel, than buy el cheapo contaminated crap with water in it.

 

[Frankie]

It would have a lot to do with the year. The following would be for a newer vehicle.

1. Faulty spark plug or wire
2. Faulty coil (pack)
3. Faulty oxygen sensor(s)
4. Faulty fuel injector
5. Burned exhaust valve
6. Faulty catalytic converter(s)
7. Running out of fuel
8. Poor compression
9. Defective computer

 

[J. D.]

if you are having a misfire, you should first check your plugs and plug wires and make sure none of them are arching out.