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Join Date: Jun 2015
Posts: 113
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Dead cylinders
I have an S2 with the middle two cylinders not firing. Weird thing is the injectors are getting signal. I even swapped them out and still no luck. Plugs are sparking. Leak down is good on all cylinders and compression is 220 across the board.
Anyone have an idea? |
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06-06-2016, 12:03 PM
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Did you try swapping the plugs. One thing I have found out is that a spark travels 10 times less distance under the compression of a cylinder than it does in the air if you pull a plug to test it.
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1987 944 Summer 2006 E90 Winter |
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06-06-2016, 01:28 PM
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Join Date: Feb 2008
Location: some ****hole
Posts: 8,648
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tap the fuel injectors.... they may be sticking.
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85 928S; LSx conversion, 5 speed with LSD.  IRR... What IRR! 
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06-06-2016, 03:06 PM
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I replaced the two injectors, not much of a chance of 4 bad ones. The two I swapped out came from a car that a friend just parted out 2 months ago and was running fine
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06-06-2016, 04:28 PM
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Did you noid light the harness?
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85 928S; LSx conversion, 5 speed with LSD. IRR... What IRR!
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06-07-2016, 01:23 PM
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Quote:
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06-07-2016, 05:32 PM
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Frankly my dear....
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Have you checked the ballast resistor pack connectors? A bad connection there could give rise to the injectors not working correctly - only the 16V engines had these I believe...
The pack is located under a plate on what would be the passenger side inner wing (fender) panel. A large aluminium pack with a round connector - mostly overlooked by people as it is pretty well hidden, but always worth a check.
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Porsche - accept no substitute Blue 1999 Boxster - Brief encounter! Black 1988 944S - Ongoing project Black 1987 944S - Gone but not forgotten Metallic Black 1980 924 - Those were the days.... Red 1979 924 - Hmm Minerva blue 1979 924 - Where it all began! |
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06-08-2016, 02:31 PM
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Need more info.
Does the car run? when did the car last run? Does it run on 1&4 cyls? How have you confirm this? How is the speed and reference sensor gap? The wiring/connectors/sensor condition? possible arching? I have worked on cars that have warped the flywheel, and would cause problems like this. My best guess: speed sensor reference sensor DME engine grounds
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85 928S; LSx conversion, 5 speed with LSD. IRR... What IRR!
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06-09-2016, 12:14 AM
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Location: SF East Bay
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First, actually confirm real fuel VOLUME. Pull the rail, put little cups under each injector and crank for 10-seconds. Compare fuel-volume in each cup.
Then measure resistance of each plug wire. Take a look inside distributor cap & rotor. I've seen brand-new caps that were strangely ovalized so two of the cylinders were getting weak spark. |
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06-09-2016, 12:34 AM
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looks like it may be the ballast resistor
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06-10-2016, 12:59 PM
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