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Registered
Join Date: Jan 2009
Posts: 1
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The dark one himself couldnt get spark in this car
Inital problem
-positive came off of starter while being driven, pulled car in and shut it off -reconnected the wire but to the ground stud on the starter (yes i know stupid) -Car turns over but dosent start -we can force spark the coil -no spark at plugs spark plugs - good spark plug wires - good coil - good reference senors - good DME - good fuses - good Battery - good Starter - good Fuel pump - good Fuel rail - good Distribuator cap - good Grounds - good Air flow sensor - good head temp sensor - good -cleaned all connections -alarm dissconnected/no longer exsits -Tach after market so no tach bounce not sre if it will when engine turns over or should -has gas in it -checekd screw that holds that metal thing in distribuator -no altenator -have checked wiring diagram via clarks garage btw its a extreme low budget porsche cup race car, 2nd at nationals mid ohio we are located in philadelphia area our plan of action for now is the jiggle method -thankyou- |
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01-18-2009, 04:04 PM
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Will work for parts
Join Date: Oct 2002
Location: Silicon Valley
Posts: 893
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if you shorted out the leads (positive voltage where it shouldn't have been) are you sure the DME is still good? I power washed my car before I tore the engine out and when it went back in I had a strange running problem that traced back to a blown DME, just from powerwashing and starting it.
Does it still have an ignition switch? Could be that it went bad. Check for voltage at the fuel pump fuse while cranking, simple was of seeing if the DME relay has power or is working. If there is no voltage, and replacing the relay dosen't fix it, then it is never getting the signal to activate. Which means the DME may not be seeing the reference sensors and not allowing spark or fuel. As far as connections go, make sure the connector right in front of the fuse box is connected and the small ground connectors on the block are clean and tight. Other than that I would have to be there to look at the car.
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'88 944 240,100 miles -race car '05 Boxster 110,000 - Daily Driver '74 911 Targa - long term project |
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01-18-2009, 05:06 PM
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Registered
Join Date: Jan 2007
Posts: 2,370
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If I were you I would consider putting in a known working DME and see if the car starts. I am no professional but sounds to me that your DME (computer) would now be toast!
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01-18-2009, 05:12 PM
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Registered
Join Date: Sep 2008
Posts: 4
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-computer is good we stuck that into our daily driver 944 and swaped visa versa (just in case)
-bypassed fuel pump relay with a switch and does have power through it and you can here it kick on -dme shows 12volts coming into the computer from the plug -cleaned all grounds |
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01-18-2009, 05:15 PM
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Will work for parts
Join Date: Oct 2002
Location: Silicon Valley
Posts: 893
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if you have fuel, voltage and the DME is good then there is something wrong in the reference sensor path. You may want to make sure you have signal at the DME (best method is an oscilloscope, can be done with a multi-meter, check clarks-garage) Normally you would check for tach bounce but if your tach never bounced, then your gonna have to check the hard way.
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'88 944 240,100 miles -race car '05 Boxster 110,000 - Daily Driver '74 911 Targa - long term project |
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01-18-2009, 05:36 PM
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Automotive Necromancer
Join Date: Nov 2006
Location: Beantown, MA
Posts: 1,544
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Sensor stuff
Ref sand speed sensors can also be checked by making a kina noid out of an led. However an oscilloscope is better.
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There may be nothing quite as expensive as a cheap Porsche: Ruby Red 84 928S : White 87 924s 2.5L NA (Blinky) M44/07-43H10676 spoiler delete - 046/2B - Belts 9/12, Clutch and OC seals 8/08 andd Red 94 Del Sol: Please put your Make, Model and Year in Sig. Try not to break more than you fix. |
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01-18-2009, 08:27 PM
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Let's go shooting.
Join Date: Feb 2003
Location: United Kingdom.
Posts: 1,200
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Sounds like a duff flywheel sensor to me.
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1983 944 Lux (manual) 2.5 litre 8 valve na and no pas 1991 944 (automatic) 2.7 litre 16 valve na and pas "I have only five words for you: From my cold, dead hands." |
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01-19-2009, 03:46 AM
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Automotive Necromancer
Join Date: Nov 2006
Location: Beantown, MA
Posts: 1,544
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connectors
Lotsa times it is the connectors and not the sensors. Make sure those are in good shape.
__________________
There may be nothing quite as expensive as a cheap Porsche: Ruby Red 84 928S : White 87 924s 2.5L NA (Blinky) M44/07-43H10676 spoiler delete - 046/2B - Belts 9/12, Clutch and OC seals 8/08 andd Red 94 Del Sol: Please put your Make, Model and Year in Sig. Try not to break more than you fix. |
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01-19-2009, 10:14 AM
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