fernleybjk
Registered
I have an intermittent idle problem. The problem occurs when the engine turns over. It either idles perfectly or gives a rough idle but only on initial start-up.
I have it in a repair shop now, NAPA repair center. They have had it for a week and a half and have done nothing to fix the problem. I went in with a rough idle and a cylinder 7 misfire code; they told me that all I needed was a tune-up so I OKed that. Later on they told me that the misfire was caused by something else. They stated that the misfire was caused because two wires leading to the coil shorted together. They proceeded to cut away the coil pack harness and splice the leads. The problem still remained. They told me then that the problem was further down the harness and that they repaired that damage. They stated problem fixed and I can pick up the car. I start a cold engine and immediately the idle problem is back.
I pick up the car yesterday. I start it up and the idle is very smooth. I make 3 stops and the third time I start it, the idle problem is back.
I return the car and tell them that the problem is not in the harness but something to do with the initial start-up sequence. I told them that is why you call and tell me that the problem is repaired but when I pick it up and start it, the problem returns. Once it's running smoothly, the car does not develop the problem.
They tell me that it is caused by vibration. I told them that if it is vibration then all you have to do is move the harness until you create or fix the problem and that would prove the harness. The tech told me that he did that and couldn't find any place that it affects the idle. Then they tried to tell me that it is a heat related problem. I told them if that were true then explain why the car immediately went into the idle fault when I started it up after the car sat for two days.
I tried to suggest all of the things that could cause that from the posts on this site but they tell me that if it were any sensor it wouldn't cause a misfire on cylinder 7 alone but would affect an entire coil pack.
I did read something funny on one of the posts. It stated that you should diagnose the problem and repair based from a solid analysis. It stated not to guess and throw things at the problem or at least make sure the things thrown are in the right direction.
Oh, it is a 98 Mark VIII, Pearlescent.
I have it in a repair shop now, NAPA repair center. They have had it for a week and a half and have done nothing to fix the problem. I went in with a rough idle and a cylinder 7 misfire code; they told me that all I needed was a tune-up so I OKed that. Later on they told me that the misfire was caused by something else. They stated that the misfire was caused because two wires leading to the coil shorted together. They proceeded to cut away the coil pack harness and splice the leads. The problem still remained. They told me then that the problem was further down the harness and that they repaired that damage. They stated problem fixed and I can pick up the car. I start a cold engine and immediately the idle problem is back.
I pick up the car yesterday. I start it up and the idle is very smooth. I make 3 stops and the third time I start it, the idle problem is back.
I return the car and tell them that the problem is not in the harness but something to do with the initial start-up sequence. I told them that is why you call and tell me that the problem is repaired but when I pick it up and start it, the problem returns. Once it's running smoothly, the car does not develop the problem.
They tell me that it is caused by vibration. I told them that if it is vibration then all you have to do is move the harness until you create or fix the problem and that would prove the harness. The tech told me that he did that and couldn't find any place that it affects the idle. Then they tried to tell me that it is a heat related problem. I told them if that were true then explain why the car immediately went into the idle fault when I started it up after the car sat for two days.
I tried to suggest all of the things that could cause that from the posts on this site but they tell me that if it were any sensor it wouldn't cause a misfire on cylinder 7 alone but would affect an entire coil pack.
I did read something funny on one of the posts. It stated that you should diagnose the problem and repair based from a solid analysis. It stated not to guess and throw things at the problem or at least make sure the things thrown are in the right direction.
Oh, it is a 98 Mark VIII, Pearlescent.