Hey Guys,>

I'm in conversation with a detailing outfit that used high pressure hot > water to clean my 1997 E420 engine.> Well, a rough idle developed the same day I picked up the car. I had a > scheduled servicing done a week later (I basically parked the car > during most of that time; especially after the CHECK ENGINE light came > on a couple of days later) and the mechanic had to change the COP (coil > on plug) for #8 cylinder. He said it was all wet when he went to > change the spark plug. #4 cylinder COP wasn't that wet and he dried it > off and reinstalled the COP.> Fortunately for me, the #4 COP failed during the test run and it had to > be changed, too. Now, the car runs great!!! Including the price of 2 > COPs.>

The detail guy claims I should have brought the car back to them right > away to allow him to try to correct the problem - basically, blow it > out with air and/or spray it with WD-40. He claims to never had any > problems with cleaning engines and said any problems were usually > solved by blowing out and spraying with WD-40 (a contradiction in the > same sentence).>

MY QUESTION:> Are COPs fixable by blowing out and flushing with WD-40? Or, do these > units short out and become inoperable? Can a COP be bench tested?> I have one of the COPs as exhibit #1.>

Any similar experiences or horror stories anyone have that I may learn from?

Hey Guys,>

I'm in conversation with a detailing outfit that used high pressure hot > water to clean my 1997 E420 engine.> Well, a rough idle developed the same day I picked up the car. I had a > scheduled servicing done a week later (I basically parked the car during > most of that time; especially after the CHECK ENGINE light came on a > couple of days later) and the mechanic had to change the COP (coil on > plug) for #8 cylinder. He said it was all wet when he went to change > the spark plug. #4 cylinder COP wasn't that wet and he dried it off and > reinstalled the COP.> Fortunately for me, the #4 COP failed during the test run and it had to > be changed, too. Now, the car runs great!!! Including the price of 2 > COPs.>

The detail guy claims I should have brought the car back to them right > away to allow him to try to correct the problem - basically, blow it out > with air and/or spray it with WD-40. He claims to never had any > problems with cleaning engines and said any problems were usually solved > by blowing out and spraying with WD-40 (a contradiction in the same > sentence).>

MY QUESTION:> Are COPs fixable by blowing out and flushing with WD-40? Or, do these > units short out and become inoperable? Can a COP be bench tested?> I have one of the COPs as exhibit #1.>

Any similar experiences or horror stories anyone have that I may learn > from?>

Thanks in advance.>

Hez of the Pacific NW

However, if you continue to drive the car with water shorting out the coils, > it will ruin it. >

Hey Guys,>

I'm in conversation with a detailing outfit that used high pressure hot >water to clean my 1997 E420 engine.>Well, a rough idle developed the same day I picked up the car. I had a >scheduled servicing done a week later (I basically parked the car during >most of that time; especially after the CHECK ENGINE light came on a >couple of days later) and the mechanic had to change the COP (coil on >plug) for #8 cylinder. He said it was all wet when he went to change >the spark plug. #4 cylinder COP wasn't that wet and he dried it off and >reinstalled the COP.>Fortunately for me, the #4 COP failed during the test run and it had to >be changed, too. Now, the car runs great!!! Including the price of 2 COPs.>

The detail guy claims I should have brought the car back to them right >away to allow him to try to correct the problem - basically, blow it out >with air and/or spray it with WD-40. He claims to never had any >problems with cleaning engines and said any problems were usually solved >by blowing out and spraying with WD-40 (a contradiction in the same >sentence).>

MY QUESTION:>Are COPs fixable by blowing out and flushing with WD-40? Or, do these >units short out and become inoperable? Can a COP be bench tested?>I have one of the COPs as exhibit #1.>

Any similar experiences or horror stories anyone have that I may learn from?>

Thanks in advance.>

Hez of the Pacific NW