77 911s ignition issues
09-23-2024, 11:34 PM
#1
6th Gear
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77 911s ignition issues
Got this car about a month ago, it hasn't been running for 12 years. The P.O. is a good friend of mine and it just stopped on him one day, he threw it on a hauler and parked it in his shop.
(He has the awful problem of having two others to drive) Gen. and Oil lights come on and it cranks strong. Little to no spark on #4 piston, nothing on #1. No spark from Coil but coil tests
fine with ohmmeter. 4th gen. Permatune module bench tested fine as well. The weirdness starts while cranking, the Tach is dead still however the Speedometer is bouncing all over the place.
Any info./clues would be greatly helpful. If there is an existing thread on this please direct me, I can't find it.
Thanks,
Kevin
(He has the awful problem of having two others to drive) Gen. and Oil lights come on and it cranks strong. Little to no spark on #4 piston, nothing on #1. No spark from Coil but coil tests
fine with ohmmeter. 4th gen. Permatune module bench tested fine as well. The weirdness starts while cranking, the Tach is dead still however the Speedometer is bouncing all over the place.
Any info./clues would be greatly helpful. If there is an existing thread on this please direct me, I can't find it.
Thanks,
Kevin
09-24-2024, 07:41 AM
#2
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Got this car about a month ago, it hasn't been running for 12 years. The P.O. is a good friend of mine and it just stopped on him one day, he threw it on a hauler and parked it in his shop.
(He has the awful problem of having two others to drive) Gen. and Oil lights come on and it cranks strong. Little to no spark on #4 piston, nothing on #1. No spark from Coil but coil tests
fine with ohmmeter. 4th gen. Permatune module bench tested fine as well. The weirdness starts while cranking, the Tach is dead still however the Speedometer is bouncing all over the place.
Any info./clues would be greatly helpful. If there is an existing thread on this please direct me, I can't find it.
Thanks,
Kevin
(He has the awful problem of having two others to drive) Gen. and Oil lights come on and it cranks strong. Little to no spark on #4 piston, nothing on #1. No spark from Coil but coil tests
fine with ohmmeter. 4th gen. Permatune module bench tested fine as well. The weirdness starts while cranking, the Tach is dead still however the Speedometer is bouncing all over the place.
Any info./clues would be greatly helpful. If there is an existing thread on this please direct me, I can't find it.
Thanks,
Kevin
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Loren
Systems Consulting - Automotive Electronics
Specializing in Porsche cars
http://www.systemsc.com/
Loren
Systems Consulting - Automotive Electronics
Specializing in Porsche cars
http://www.systemsc.com/
09-24-2024, 10:09 AM
#3
Burning Brakes
Electrical gremlins are the worst. Old Permatune (and MSD and other electronic ignition) boxes often develop problems. Old coils are junk. It it were mine, I'd strip out the whole kit and kaboodle and go back to stock, which is a big job that I think unfortunately requires replacing the Permatune distributor. Don't forget to replace the wires.
09-24-2024, 01:10 PM
#4
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Electrical gremlins are the worst. Old Permatune (and MSD and other electronic ignition) boxes often develop problems. Old coils are junk. It it were mine, I'd strip out the whole kit and kaboodle and go back to stock, which is a big job that I think unfortunately requires replacing the Permatune distributor. Don't forget to replace the wires.
09-24-2024, 04:05 PM
#5
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Electrical gremlins are the worst. Old Permatune (and MSD and other electronic ignition) boxes often develop problems. Old coils are junk. It it were mine, I'd strip out the whole kit and kaboodle and go back to stock, which is a big job that I think unfortunately requires replacing the Permatune distributor. Don't forget to replace the wires.
Even if all that stuff checks ok? From what I can tell it’s the original Bosch blue coil I tested and I’ve swapped with another known working coil with the same result, no start. The distributor appears to be stock Bosch with functioning points(opening/closing. The Permanente box appears to be a replacement that bench tests fine. After getting my 70 Westfalia running again I’m reluctant to start throwing parts at the 911 to see what sticks.
Are there any characteristics of midyear 911s I need to look for be aware of?
09-24-2024, 06:48 PM
#6
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Even if all that stuff checks ok? From what I can tell it’s the original Bosch blue coil I tested and I’ve swapped with another known working coil with the same result, no start. The distributor appears to be stock Bosch with functioning points(opening/closing. The Permanente box appears to be a replacement that bench tests fine. After getting my 70 Westfalia running again I’m reluctant to start throwing parts at the 911 to see what sticks.
Are there any characteristics of midyear 911s I need to look for be aware of?
Are there any characteristics of midyear 911s I need to look for be aware of?
Yesterday, 06:28 PM
#7
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Even if all that stuff checks ok? From what I can tell it’s the original Bosch blue coil I tested and I’ve swapped with another known working coil with the same result, no start. The distributor appears to be stock Bosch with functioning points(opening/closing. The Permanente box appears to be a replacement that bench tests fine. After getting my 70 Westfalia running again I’m reluctant to start throwing parts at the 911 to see what sticks.
Are there any characteristics of midyear 911s I need to look for be aware of?
Are there any characteristics of midyear 911s I need to look for be aware of?
Looks like I'm in search of a core. The least expensive 3pin Bosch CDI on Ebay was an untested one for $490. Rebuilts seem to be that much at least + $300 core charge. Anybody out there have a 3pin Bosch paperweight they want to part with?
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Yesterday, 06:30 PM
#8
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Got this car about a month ago, it hasn't been running for 12 years. The P.O. is a good friend of mine and it just stopped on him one day, he threw it on a hauler and parked it in his shop.
(He has the awful problem of having two others to drive) Gen. and Oil lights come on and it cranks strong. Little to no spark on #4 piston, nothing on #1. No spark from Coil but coil tests
fine with ohmmeter. 4th gen. Permatune module bench tested fine as well. The weirdness starts while cranking, the Tach is dead still however the Speedometer is bouncing all over the place.
Any info./clues would be greatly helpful. If there is an existing thread on this please direct me, I can't find it.
Thanks,
Kevin
(He has the awful problem of having two others to drive) Gen. and Oil lights come on and it cranks strong. Little to no spark on #4 piston, nothing on #1. No spark from Coil but coil tests
fine with ohmmeter. 4th gen. Permatune module bench tested fine as well. The weirdness starts while cranking, the Tach is dead still however the Speedometer is bouncing all over the place.
Any info./clues would be greatly helpful. If there is an existing thread on this please direct me, I can't find it.
Thanks,
Kevin
have you replaced the points and set the dwell?