after1 week - no start... coil?
01-13-2002, 10:47 PM
#16
Racer
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Location: Attleboro, MA
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Steve,
I've done that coil test many times on other cars... this is the first time on the 928. I had read that doing this type of test on the newer 928's was a definite no-no but I thought it was ok on the older ones???
For sure it was running good and then just didn't start so something had gone wrong before I touched it but I sure hope I sure hope I didn't add to my problems! With my luck, i'll get new coild and find that I toasted the ctrl unit
!
Thanks for the hand holding... I'll order a new coil tomorrow and hope for the best!
I've done that coil test many times on other cars... this is the first time on the 928. I had read that doing this type of test on the newer 928's was a definite no-no but I thought it was ok on the older ones???
For sure it was running good and then just didn't start so something had gone wrong before I touched it but I sure hope I sure hope I didn't add to my problems! With my luck, i'll get new coild and find that I toasted the ctrl unit
!Thanks for the hand holding... I'll order a new coil tomorrow and hope for the best!
01-16-2002, 09:49 PM
#17
Racer
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Update:
Got the new coil today. I measured the primary and secondary resistance for kicks and to my surprise, it was the same as the old one I took out (and primary was still slightly out of factory spec. .6 ohms where .46 should be the maximum). I figured my meter might be slightly off and installed the new one anyway. The engine cranked once and fired right up!
Nothing else was changed so I'm convinced that the coil was the problem. I also noticed that the engine fires up faster than before. It used to crank over two or three revolutions before firing up. Now, it barely goes through one revolution before starting.
I know that the resistance checks only go so far and I've heard of other peoples coils checking out okay resistance wise yet, still not functioning. I'm a believer now. $45.00 well spent in my book.
Got the new coil today. I measured the primary and secondary resistance for kicks and to my surprise, it was the same as the old one I took out (and primary was still slightly out of factory spec. .6 ohms where .46 should be the maximum). I figured my meter might be slightly off and installed the new one anyway. The engine cranked once and fired right up!
Nothing else was changed so I'm convinced that the coil was the problem. I also noticed that the engine fires up faster than before. It used to crank over two or three revolutions before firing up. Now, it barely goes through one revolution before starting.
I know that the resistance checks only go so far and I've heard of other peoples coils checking out okay resistance wise yet, still not functioning. I'm a believer now. $45.00 well spent in my book.
01-16-2002, 10:41 PM
#18
John V.,
Sehr Gut!
Glad to hear the good news.
Sometimes the simplest topics get the Electron Guru's thinking and providing alternates, tests, and fixes we neophytes would seldom think of. In this case a coil and a fix did the job. Max was pretty well spot on and we have had numerous posts as to the coil testing OK only to find that it was an intermittent failure that leads up to an eventual total faiure. The coil is probably the hardest working reliable part on a car. Comes to life when you turn the key and works until you shut down. Provides spark to 8 cylinders on every revolution... now lets see say 4800rpm times eight that puppy has to charge the field and collapse to the distributor roughly 38,400 time in that particular minute. Amazing ain't it? Again thanks for the insight Max, Steve, DrBob, James and Tom. Joel have you tried the coil?
John S. and Pattycakes
Sehr Gut!
Glad to hear the good news.
Sometimes the simplest topics get the Electron Guru's thinking and providing alternates, tests, and fixes we neophytes would seldom think of. In this case a coil and a fix did the job. Max was pretty well spot on and we have had numerous posts as to the coil testing OK only to find that it was an intermittent failure that leads up to an eventual total faiure. The coil is probably the hardest working reliable part on a car. Comes to life when you turn the key and works until you shut down. Provides spark to 8 cylinders on every revolution... now lets see say 4800rpm times eight that puppy has to charge the field and collapse to the distributor roughly 38,400 time in that particular minute. Amazing ain't it? Again thanks for the insight Max, Steve, DrBob, James and Tom. Joel have you tried the coil?
John S. and Pattycakes
01-19-2002, 03:09 PM
#19
Racer
Thank you John for your kind words.
It was just a lucky guess : )
Here's a hint; some electrical devices will not show there weaknesses untill stressed. As coils age, there ability to handle these stresses becomes much lower.
Cheers
Max
It was just a lucky guess : )
Here's a hint; some electrical devices will not show there weaknesses untill stressed. As coils age, there ability to handle these stresses becomes much lower.
Cheers
Max
