Engine Performance problem
2002 Chevy Silverado V8 Four Wheel Drive Automatic 54,000 miles
I looked through the Repair Question Forums and do not see anything specific that helps answer what might be wrong with my vehicle so now I am sending my question to you and very much hope that you may be able to help. I have a 2002 Chevy Silverado Pick-up Truck. V8, 6.0 liter engine, K2500. 4 Wheel Drive. Automatic. 54,000 miles. Check Engine Soon light is blinking. Code P0300 Random misfire. Light does not come on at all while driving around town. Only comes on when on the highway at over 60 mph. The light blinks for several minutes and then eventually goes out. Then several minutes later it comes back on blinking again. When the light comes on, the truck continues to run smoothly and there is no indication that something is wrong.
I brought the truck to be serviced. They replaced Intake manifold gasket with new design. (They said there is a bulletin out from GM that if the gasket is the color green then it could become defective. They said my truck had the green one.) The garage seemed to assume that because of this bulletin that this must be what was wrong. They also did an oil and filter change and changed all eight Spark Plugs. ( My truck had 100,000 mile spark plugs so I’m not sure why they needed to change the spark plugs now).
The next day, I went on the highway with the truck and once again the light was blinking. I called the garage and they said to bring it back and they would check every thing again. At this time they rechecked the connections to intake and cleaned engine grounds and also replaced the fuel filter. When I picked up the truck, they said everything should be fine now. I took it on the highway and again the light was still blinking. I called the garage again and they said to bring it back. When I picked up the truck they said they once again checked everything and it now definitely should be fine. I went on the highway and the light is blinking on again.
I’m very frustrated and aggravated. It cost me almost $540.00 and I am feeling that bringing my truck to this garage might have been a waste of time and money because they did not solve the engine light problem. I’m thinking that they are not following diagnostics thoroughly to solve the problem. The second time I brought the truck back, I felt like I was being brushed off. They don’t seem to be doing anything more about it. I don’t know what to do next.
Also, prior to having this service engine light problem, I had this vehicle at the dealer and was told the Engine Oil Cooler Lines are starting to leak. They said they would need to replace the hose. The garage that I brought the truck to for the engine light said that this would not affect the light coming on and it is a separate problem. True?
One other thing I can think of mentioning: When I first start driving the vehicle I can hear a engine tapping type of noise but again I think this might be a separate problem. (I told the garage this as well.)
I am hoping you could give me some insight on what might be wrong. I would really appreciate any suggestions. I’m really discouraged! Please help!
Thursday, March 19th, 2009 AT 10:39 AM