It is very difficult to diagnosis your problem because almost all of these engines have the same problem but they all have a different problem. My question would be to the dealership that changed the #7 injector twice. I would ask them what lead them to believe that it was #7 injector? If they say that the computer showed a code or their engine scanner told them so (or something like that) ask them what the DTC code number was? DTC means Diagnostic Trouble Code. A DTC will turn ON your check engine light. When this happens there is a sensor somewhere on your vehical sending a trouble code to the computer. These codes can be read by a scanner that hooks up to a data connector located within 3 feet your steering wheel. If you look under the dash below the steering wheel, just a little to the left you will see this connector.
These codes will lead you to the area where the problem is coming from. Without having the DTC code that your engine is setting off It is very difficult to tell you what is wrong.
The good news is that Autozone or a place like that will scan your engine for free and tell you what code is being set. So the next time the check engine light comes on go to Autozone and have them hook up their scan tool and get the trouble code. Let me know what it is and I will have a better answer to this problem.
The dealer that changed the #7 injector should have a record of the code they got that lead them to change the #7 injector twice. If not then I would say that you have been taken advantage of. This type of stuff realy gets under my skin because computers in cars are intended to make problems like yours easier to diagnosis and fix.
BTW- You can buy an inexpensive scan tool at Sears or any autoparts store for your vehical. For you this may be a good investment because then you could scan your own engine and have an edge on a shadey mechanic who may fix something that wasn't even the problem.
Tuesday, February 19th, 2008 AT 2:34 PM