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Registered User
Join Date: Dec 2015
Posts: 6
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85 911 No Fuel Pump, Injector Pulse or Spark
I have a 911 as in the title no spark and no Fuel
I have no spark No Fuel but fuel pump runs when powered DME relay is supposed to be new DME relay clicks when turned to run bun no second click while starting New coil TDC and speed sensor read about 1000 ohms The ICV does not seem to do anything in run position I want to bypass the alarm module but can't seam to find it. Not even sure it has an alarm. It is a convertible if that matters. How can I tell if the car is equipped with factory alarm. And where is the module located? Was also told they pressure washed it at the same time of no start. Not sure where all that pressure washed supposedly fender wells. Maybe that might click with somebody about the cause of my problem Last edited by JGreer97; 12-01-2015 at 09:36 AM.. |
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12-01-2015, 09:25 AM
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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,482
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Factory alarm key goes into the receiver on the back of the door. Silver with black trim. Just a black plastic plug if no alarm
Bruce |
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12-01-2015, 12:28 PM
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Member 911 Anonymous
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Check the grounds in the engine bay and at the gear box to chassis. There may be moisture between the contact points.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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12-01-2015, 12:43 PM
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Registered User
Join Date: Dec 2015
Posts: 6
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I have a key hole a the end of my drivers door. With the key in run position what pins should I have power and ground on the DME connector?
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12-02-2015, 04:46 AM
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Registered
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Had 2 NEW DME relays not work...
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12-02-2015, 07:04 AM
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Registered User
Join Date: Dec 2015
Posts: 6
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Is there a way to jump the DME relay wiring to check? Found the alarm module bypasses with no luck.
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12-02-2015, 07:14 AM
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Registered User
Join Date: Dec 2015
Posts: 6
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Ok changed the DME relay. Now have click at run and second click at cranking. Fuel pump is now activating. Still no spark.
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12-02-2015, 07:45 AM
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Registered
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Quote:
When I opened up the two NEW DME relays that were DOA I found several cold flow solder joints. Repaired both, not I have 2 good spares so Murphy says I will never have another DME relay failure. |
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12-02-2015, 08:50 AM
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Registered
Join Date: Jan 2009
Location: Marietta, Ga (Atlanta)
Posts: 2,970
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Quote:
Amen on reflowing the solder joints on suspect relays. That is almost always the fix for a malfunctioning relay. It ain't "rocket science" or a mystery what goes bad, it's only a simple dual relay after all!
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'80SC Widebody 3.6 transplant Anthracite "The Rocket" Long gone but still miss them all: '77 911 Targa, '72 BMW 3.0CS Coupe(finest car I ever had!) '71 911T Coupe White, '70 911T Coupe Blue '68 911 Coupe Orange, '68 911L Soft Window Targa Last edited by uwanna; 12-02-2015 at 09:09 AM.. |
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12-02-2015, 09:06 AM
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Diss Member
Join Date: Jul 2002
Location: SC - (Aiken in the 'other' SC)
Posts: 5,020
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You can very simply take the question of if the DME relay is the issue off the table by simply creating a jumper to switch the systems on: DME Jumper Post
(Don't leave the jumper in place beyond the time you are actually testing or running the motor.) That will supply the power to make the DME and fuel systems run. If that doesn't solve the issue it means the relay wasn't the issue. You need to be sure the flywheel sensors (and others) are supplying the correct signals otherwise the DME won't signal the coil, turn on the fuel pump, trigger the injectors, etc...
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- "Speed kills! How fast do you want to go?" - anon. - "If More is better then Too Much is just right!!!" - Mad Mac Durgeloh -- Wayne - 87 Carrera coupe -> The pooch. |
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12-02-2015, 09:12 AM
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Registered User
Join Date: Dec 2015
Posts: 6
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I have to be missing something here. As I stated I changed the DME relay fore a second time and now have fuel pump activation. So one I just have no spark. Changed the coil and even went back to the old coil, no luck. Withe key at run position I have 12 volts on both sides of coil. How do I test the coil wires while cranking. Is there any kind of Item that controles or energizers The coil?
Both of my sensors test at 1000 ohms TDC and Speed. Could they still be bad? |
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12-02-2015, 10:33 AM
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Registered
Join Date: May 2002
Location: St Louis
Posts: 4,211
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Quote:
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Rick 88 Cab |
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12-02-2015, 03:02 PM
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Registered User
Join Date: Dec 2015
Posts: 6
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Quote:
Figured it out. Read in another posting that if you had a good reference sensor you could check for bad sensor and/or pickup. I did this and she fired up. Removed sensors and found damage and a sheared of pick up pin. Does anyone know then measurement for the set screw? |
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12-03-2015, 05:09 AM
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Marble Grey
Forever
Whatever
Fasst
