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Registered
Join Date: Jun 2009
Location: Los Angeles
Posts: 86
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Detonation /Pinning
I have been chasing a weird issue. the car seems rich at idle and lean in the upper RPM's last night I was coming home from work and really got on the car. up above 4000 rpms it started to detonate and the car seems to fall off in the upper rpm range it even sounds different like louder this was after a hour of stop and go traffic. I pulled my plugs and they are white as the day I put them in, they have about 2000 miles on them. I also checked the afm temp sender about a 1/2hr after I shut the car of I got a reading of .98ohms then I waited 3 hrs it was about 56 deg out and I got a reading of 2.58 ohms also on my way to work this morning when the car wasn't quiet up to operating temp I got on it and no detonation and seem to pull through the RPM range better. this is driving me mad
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1988 944 with early motor 1974 Bronco, 1965 BSA Lightning |
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12-16-2009, 09:47 AM
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Join Date: Apr 2007
Location: Buffalo, NY
Posts: 1,635
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The AFM rebuild has been a real help for a lot of people on here lately. It seems as though a lot of these cars are wearing out the resistor strip in the AFM.
YouTube - Rejuvenating a Bosch Motronic Air Flow Meter
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John '87 944 N/A (first Porsche) '95 E-350 Diesel '03 S-Type Jag 3.0 '03 Taurus SES '06 Eddie Bauer Explorer RIP SoCal |
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12-16-2009, 10:47 AM
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Location: Los Angeles
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I checked it per Clarks garage and it tested good. but I might do the repair anyways just to be sure. also their is a little black plug on the DME plug anybody know whats its for??
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1988 944 with early motor 1974 Bronco, 1965 BSA Lightning |
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12-16-2009, 11:17 AM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
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Hotter temperature increases the likelihood of detonation, as would a bad batch of fuel.
What black plug are you referring to (how many pins)?
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
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12-16-2009, 04:21 PM
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Registered
Join Date: Jun 2009
Location: Los Angeles
Posts: 86
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it looks like 2 pins its right off the big white one that clips into the dme
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1988 944 with early motor 1974 Bronco, 1965 BSA Lightning |
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12-16-2009, 04:36 PM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
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I believe it is a "test" plug of some sort. But I don't recall exactly what it is for, other than that.
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
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12-16-2009, 04:52 PM
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Registered
Join Date: Apr 2007
Location: Buffalo, NY
Posts: 1,635
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I have seen many pics on here of the DME area with the same wire harness left unplugged in all of them.
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John '87 944 N/A (first Porsche) '95 E-350 Diesel '03 S-Type Jag 3.0 '03 Taurus SES '06 Eddie Bauer Explorer RIP SoCal |
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12-17-2009, 05:06 AM
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