Suicide!!!
09-14-2011, 03:47 PM
#46
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They are serious if you used to drive a bicycle
09-14-2011, 08:59 PM
#48
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Snapping the drive shaft due to one or both of these problems is not an immediate certainty. It's an increasing probability proportional to the operating hours with the problem(s). What is certain is that the operating life of the shaft is shortened. What is uncertain is how much life your drive shaft has left in it.
Never mind the drive shaft though. If your 928 is running on 4-cylinder mode and has vacuum leaks, driving it that way is a) no fun anyway and b) hard on other parts besides the shaft.
If it is the IMS triggering the bad running whatever you do don't just bypass the IMS because ...
... no one has yet mentioned that driving an auto 928 with unburned fuel going out the exhaust can lead to a cat fire that may then spread to the ATF lines that run over the heat shields. ATF is flammable. And THAT is why the IMS system was added in '89 - to prevent crispy 928s.
Yeah - this is the scared straight post.
But, you CAN sort this out. It's science, but it ain't Rocket Science. Rennlist has all the answers. Just be methodical and be patient and don't trust to luck.
09-14-2011, 09:03 PM
#49
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Ok. Ok. So sue me: I forgot to mention that 'lektrical gremlins can trigger it too 
I just assumed that everyone already knew that gremlins can trigger everything from the IMS on a 928 to Global Warming in Al Gore's head.
I just assumed that everyone already knew that gremlins can trigger everything from the IMS on a 928 to Global Warming in Al Gore's head.
09-14-2011, 09:48 PM
#50
Rennlist Member
What he said.
You forgot to add "... and the transmission shifts really hard at low speeds because it doesn't have manifold vacuum."
Snapping the drive shaft due to one or both of these problems is not an immediate certainty. It's an increasing probability proportional to the operating hours with the problem(s). What is certain is that the operating life of the shaft is shortened. What is uncertain is how much life your drive shaft has left in it.
Never mind the drive shaft though. If your 928 is running on 4-cylinder mode and has vacuum leaks, driving it that way is a) no fun anyway and b) hard on other parts besides the shaft.
If it is the IMS triggering the bad running whatever you do don't just bypass the IMS because ...
... no one has yet mentioned that driving an auto 928 with unburned fuel going out the exhaust can lead to a cat fire that may then spread to the ATF lines that run over the heat shields. ATF is flammable. And THAT is why the IMS system was added in '89 - to prevent crispy 928s.
Yeah - this is the scared straight post.
But, you CAN sort this out. It's science, but it ain't Rocket Science. Rennlist has all the answers. Just be methodical and be patient and don't trust to luck.
Snapping the drive shaft due to one or both of these problems is not an immediate certainty. It's an increasing probability proportional to the operating hours with the problem(s). What is certain is that the operating life of the shaft is shortened. What is uncertain is how much life your drive shaft has left in it.
Never mind the drive shaft though. If your 928 is running on 4-cylinder mode and has vacuum leaks, driving it that way is a) no fun anyway and b) hard on other parts besides the shaft.
If it is the IMS triggering the bad running whatever you do don't just bypass the IMS because ...
... no one has yet mentioned that driving an auto 928 with unburned fuel going out the exhaust can lead to a cat fire that may then spread to the ATF lines that run over the heat shields. ATF is flammable. And THAT is why the IMS system was added in '89 - to prevent crispy 928s.
Yeah - this is the scared straight post.
But, you CAN sort this out. It's science, but it ain't Rocket Science. Rennlist has all the answers. Just be methodical and be patient and don't trust to luck.
I've got to stop assuming everyone knows about the Car-B-Q potential.......
09-14-2011, 10:00 PM
#52
Administrator - "Tyson"
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09-14-2011, 10:05 PM
#53
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09-15-2011, 03:09 PM
#55
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Sod's Law, isn't it?
Took the car for a spin this morning in the hope a miracle had happened overnight. No luck, no power, no joy. Sounded like a steam engine. Still apparently only firing on four.
Had breakfast then returned to check out all the suggestions and advice you guys have given me. Started the engine and it purred like a kitten. Drove it around the block and it performed perfectly. Heavens above!!
Decided anyway to do some of the checks you guys have suggested. First the coil.
The HT lead connection to the coil is badly corroded and there seems to be signs of an electrical arc between contacts.
I don't know whether this is the culprit, but I've ordered a new lead and coil and then I'll keep my fingers crossed.
Took the car for a spin this morning in the hope a miracle had happened overnight. No luck, no power, no joy. Sounded like a steam engine. Still apparently only firing on four.
Had breakfast then returned to check out all the suggestions and advice you guys have given me. Started the engine and it purred like a kitten. Drove it around the block and it performed perfectly. Heavens above!!
Decided anyway to do some of the checks you guys have suggested. First the coil.
The HT lead connection to the coil is badly corroded and there seems to be signs of an electrical arc between contacts.
I don't know whether this is the culprit, but I've ordered a new lead and coil and then I'll keep my fingers crossed.
If you're losing 4 cylinders at once it could be a bad coil or (hopefully) poorly grounded or corroded electrical connections.
