1. Robbiev

    Robbiev Member

    I have an 02 Yukon with about 50k miles. The service engine soon light came on (Flashing at first then went steady). Plugged a computer in and got code P0305 (Misfire #5). I changed all the wires and #5 plug and coil. Light continued to flash after reseting computer. Originally I could not feel any difference in the truck. Then it got progressively worse(Truck shuttering and very rough idle) I brought it to my local mechanic who put his computer on it and found multiple misfires on almost all cylinders. He checked the fuel nozzles and systems and it checked good. Has anyone have any idea's on what this could be or better yet has anyone had this problem. I am thinking it's the computer or a faulty ground. Thanks for your help
  2. 84fiero123

    84fiero123 Epic Member 5+ Years 1000 Posts Platinum Contributor

    Clogged cat maybe?

    When it starts running like crap, just look underneath, if the converter is glowing that’s your problem.

    If it is, it should still be under warranty. Emitions (SP) standards have 7 years 100k miles. By the EPA.
  3. ChevyFan

    ChevyFan The Sheriff Staff Member 5+ Years 1000 Posts

    Yeah, that's a thinker because it's like it's spreading and getting worse. Over what time period did it gradually get worse?
  4. Robbiev

    Robbiev Member

    It was a total of 2 weeks from when the original "Service Engine Soon" light came on to when it was really bad. I thought the "Cat" also but my mechanic has not yet looked into that. i dropped the truck off thursday night so he only had a chance to look at it friday. Hopefully I will no more tomorrow. I will update you guys when I find out more info. Thanks
  5. ChevyFan

    ChevyFan The Sheriff Staff Member 5+ Years 1000 Posts

    ahh, you got caught over the 3 day weekend. Let us know what he finds out.
  6. Robbiev

    Robbiev Member

    Update. well I wish I had some info for you guys but my mechanic is stumped and sent it off to another garage where a GM master Tech works. He has checked everything (Coils,wires,plugs,fuel nossles,compression,wiring from the coils,crank shaft sensor) and it all checks out good. We are down to either Intake manifold, computer or engine. I really would like to contact GM about this matter when I have it resolved and express my displeasure with there truck. This is the first GM vehicle I have ever owed and right now it probably will be my last. I have heard that sometimes GM will warranty vehicles even though they are out of warranty. Has anyone ever seen or heard of this?
    Tahoe Parts
  7. Robbiev

    Robbiev Member

    Well I finally got the Yukon back from the shop after 2 weeks. It turns out that I had a soldered wire that was loose and was causing a short to ground. It ended up frying the #5 injector. They resoldered the wire connection and replaced the injector and now the truck runs perfect.
  8. ChevyFan

    ChevyFan The Sheriff Staff Member 5+ Years 1000 Posts

    Where was the loose wire at?
  9. unplugged

    unplugged Epic Member 5+ Years 1000 Posts

    You've been fleeced

    I'd fire the first mechanic. Someone who just swaps parts until the problem goes away is not a very good mechanic. Especially when they can't fix the problem and you have to take it to someone competent.

    Part of the problem is the fault of the consumer. When a service writer or mechanic writes up the service order, make sure that what you are paying for is to fix the problem, not to swap parts.

    In other words if your car is having trouble starting, make sure that is what is on the service order. If the mechanic calls you and says it needs a new starter, agree to have him replace the starter, only if it fixes the starting problem. Don't pay for a starter if you don't need one.

    If your mechanic says something like: "It's probably the starter, besides your car has 50k miles on it, so it could use a new starter anyway" tell him you'll be right down to take your car to someone who knows what they are doing.

    Don't get ripped off by so called mechanics. A good mechanic will troubleshoot and isolate your problem, not just swap parts till it's gone, or you run out of money.
    Chevy Parts
    1 person likes this.
  10. TrailLeadr

    TrailLeadr Epic Member 5+ Years 1000 Posts

    It's too bad when that kind of thing happens. I did have a similar issue but the mechanic (actually transmission repair tech) swapped parts to isolate, but never actually charged me for the parts or the labor, until he fixed the actual problem.
    It was kind of an inconvenience, since it took a few weeks. I would drive it, and let him know what was happening. But he made it his mission, and since I didn't pay for extras I didn't mind.

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