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Greasy Member
Join Date: Mar 2006
Location: Indiana
Posts: 1,457
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intermittant injector??
Had a unique issue the other day when moving the cars to my new garage. I started the 944, and it only ran on 3 cyl's. I checked the plugs, and I was getting spark to all 4 plugs, but when I shorted each one individually, #4 wasn't firing!
I turned the car off, and tried re-starting a couple of times, and it still was missing. About an hour later, I tried again, and it fired right up on all 4!? Anybody had this happen before? (I checked the the #4 injector wire with a noid light, and it was indeed getting signal when it was missing) Just dirty? Am I looking at a new injector in the near future? Whatca all think? Thanks -Nick
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Owner: Bennington Motorsports www.benms.com Sponsor for Midwest Region 944-SPEC racing series -When was your timing belt changed or tensioned?? -Yes, I'm the crazy man that will loan out my 9201. Just PM me, I will add you to the list and get it out ASAP. |
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05-01-2007, 02:21 PM
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Registered
Join Date: Mar 2006
Location: Waterloo, ON, Up North
Posts: 287
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You could pull the fuel rail and pull the electrical leads on all the injectors but #4. Put the injector into a cup and crank a few times to see how much (if any fuel) your getting from it.
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'86 Porsche 944, Guards Red Nancy is currently [going in for the final 'once over' this week..] AFJuvat - "Thou art affirmed: Go forth and inject fuel my son." LOL |
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05-01-2007, 02:26 PM
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Greasy Member
Join Date: Mar 2006
Location: Indiana
Posts: 1,457
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I would, but it's running fine now...
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Owner: Bennington Motorsports www.benms.com Sponsor for Midwest Region 944-SPEC racing series -When was your timing belt changed or tensioned?? -Yes, I'm the crazy man that will loan out my 9201. Just PM me, I will add you to the list and get it out ASAP. |
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05-01-2007, 02:29 PM
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Registered
Join Date: Mar 2006
Location: Waterloo, ON, Up North
Posts: 287
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Make sure the contacts on the injector and the plug going in are sparkly clean..if they are then I'd just bet on gunk from the tank making its way up to the rail.
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'86 Porsche 944, Guards Red Nancy is currently [going in for the final 'once over' this week..] AFJuvat - "Thou art affirmed: Go forth and inject fuel my son." LOL |
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05-01-2007, 02:33 PM
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It's really hard to diagnose a problem on a perfectly running car, isn't it? No way to tell now.
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Tom 1990 944S2 Cabriolet 2002 Chevy Silverado 2500HD 2003 Maroon Ford F350 dually |
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05-01-2007, 05:11 PM
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It's not uncommon to have one of the plug wires pull out of the end of the connector. The weather boot will hold it in place. The end of wire connector (threaded to screw into the connector) can also corrode like heck inside the weather boot. Then the ballast in the connector can fail too. But this is very seldom with a stock ignition setup.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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05-01-2007, 06:34 PM
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1983 Porsche 944 2.5 liter
