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Ornery Bastard
Join Date: Sep 2001
Location: South Sound
Posts: 2,879
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Adjusting the Throttle Position Sensor on a 951
The TPS on my new-to-me 951 is a little hypersensitve with the "throttle closed" part of it. It takes almost nothing to "un-trigger" that particular part of the sensor and the ECU only reads full throttle closure about 50% of the time when I take my foot off the gas. I've been noticing this at stoplights where the engine will "hang" at about 2,000 RPM with the clutch disengaged.
I checked unter the hood and behind the pedals, the throttle cable is _not_ binding. With the engine off, I can hear the little "click" sound of the throttle-closed sensor if I even touch the throttle cam. It's way to sensitive on tip-in and I need to back it off just a hair. I know where it's located, but I don't know which way to rotate it. Aaron
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--------- Silver 1998 Volvo S70 T5 <- Daily (Anja) Guards Red 1986 951 <- Seattle car (Gretchen) White 1976 914 2.0 F.I. <- Prodigal car, traded away then brought back again (Lorelei) |
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07-02-2005, 03:25 PM
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Registered
Join Date: Jun 2004
Location: Burrillville, RI
Posts: 105
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http://www.clarks-garage.com/shop-manual/fuel-06.htm
Clarks garage. Bookmark it.  edit - oh i just saw you need to know which way to rotate it.. Not sure on that one, but maybe adjusting it by those instructions will help?
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1985.5 944 NA |
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07-02-2005, 06:18 PM
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Ornery Bastard
Join Date: Sep 2001
Location: South Sound
Posts: 2,879
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Yield, looked there already. Definitely appreciate the effort though.
Looking at things again, I think I may be over-thinking this one. The throttle cable is very taut even at full closure. I may just have to back that off a little instead. Seem to have made it harder than it needs to be by looking at the TPS first. I'm going to go adjust it and then report back.
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--------- Silver 1998 Volvo S70 T5 <- Daily (Anja) Guards Red 1986 951 <- Seattle car (Gretchen) White 1976 914 2.0 F.I. <- Prodigal car, traded away then brought back again (Lorelei) |
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07-02-2005, 06:28 PM
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Registered
Join Date: Jun 2004
Location: Burrillville, RI
Posts: 105
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FWIW my throttle cable has a fair amoutn of slack at no throttle, near the throttle cam.
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1985.5 944 NA |
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07-02-2005, 06:41 PM
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Ornery Bastard
Join Date: Sep 2001
Location: South Sound
Posts: 2,879
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Quote:
I guess it's one of those things that's so obvious I missed it.
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--------- Silver 1998 Volvo S70 T5 <- Daily (Anja) Guards Red 1986 951 <- Seattle car (Gretchen) White 1976 914 2.0 F.I. <- Prodigal car, traded away then brought back again (Lorelei) |
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07-02-2005, 06:43 PM
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The cable sheathing termination at the firewall to the left of the brake booster can get pulled out and get hanged up. It is somewhat hidden from plain view. Check that one first.
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1993 964 C2 still makes me smile Retired and work as needed as a pain in the **s. |
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07-03-2005, 02:47 AM
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Did you get the memo?
Join Date: Mar 2003
Location: Wichita, KS
Posts: 32,403
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Ditto on the slack near the throttle cam on my 951. Mine hangs at 1200 sometimes, I'm guessing it's an vac leak though.
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‘07 Mazda RX8-8 Past: 911T, 911SC, Carrera, 951s, 955, 996s, 987s, 986s, 997s, BMW 5x, C36, C63, XJR, S8, Maserati Coupe, GT500, etc |
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07-03-2005, 07:04 AM
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Ornery Bastard
Join Date: Sep 2001
Location: South Sound
Posts: 2,879
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Problem solved. Definitely was the throttle cable.
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--------- Silver 1998 Volvo S70 T5 <- Daily (Anja) Guards Red 1986 951 <- Seattle car (Gretchen) White 1976 914 2.0 F.I. <- Prodigal car, traded away then brought back again (Lorelei) |
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07-03-2005, 07:51 PM
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911
