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951: hard time starting, dies later

So, no spark, fuel seems ok. The car doesn't want to start and eventualy it will - otherwise the starter is just turning the engine. Also, it will die while in operation (on the road).

I figure it could be the engine speed/refrence sensors. Does anyone know:
1) How often the wiring in the connectors at the back of the plenum go out.
2) Is the spacing between the sensors and the flywheel pins a critical measurement?

-jamie

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1986 951, India Red. (Mine) - Not For Sale Anymore
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Old 10-09-2005, 09:03 AM
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Ornery Bastard
 
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The wiring doesn't usually just "go out" if it hasn't been touched as far as I know.

The spacing is absolutely critical or the system won't read right.

If you're not getting a reading from the sensors though, you won't get fuel either. DME shuts off fuel if the engine stops running.

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)
Old 10-09-2005, 09:59 AM
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thanks.
now does anyone know if i can check the resistance of the sensors to see if they are good or bad. i fgure i should check that before i go down and start adjusting stuff.
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1986 951, India Red. (Mine) - Not For Sale Anymore
1987 944, Alpine White. (Bother's)
2000 Audi A6 2.7 Biturbo Melange (Mom's)
Old 10-09-2005, 02:29 PM
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Ornery Bastard
 
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That's just it, you say you're getting fuel. If you know for certain that the injectors are firing, the sensors are good. Period.

If the DME cannot get an intelligible reading from the sensors, it considers the engine to be off and will shut down the injectors and the fuel pump. These are go/no go things. If they are flaky the car will not struggle, it will die _right now_. It will be just like turning off the key. There will be no attempt at running.
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Shifting is an art. Learn it, love it, live it.
---------
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)
Old 10-09-2005, 05:39 PM
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Sorry for the late update, I replaced both sensors and it worked beautifully. Thanks for the help Aaron.
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1986 951, India Red. (Mine) - Not For Sale Anymore
1987 944, Alpine White. (Bother's)
2000 Audi A6 2.7 Biturbo Melange (Mom's)
Old 11-06-2005, 12:08 AM
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Cool, glad you are keeping her now.

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Old 11-06-2005, 10:02 AM
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