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Registered User
Join Date: Aug 2015
Posts: 33
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idles rough spits and back fires threw exhaust and wont rev
Can't figure this out got good fuel pressure all spark plugs firing injectors are spraying and can't get it to do.more then idle like crap and pop out the exhaust pops black smoke it almost looks like. If you rev it it dies. Starts right back up but just goes back to idling like crap please help thanks
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08-03-2015, 02:32 PM
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Registered
Join Date: Jun 2014
Location: Lake County, FL
Posts: 820
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Order a replacement fuel pressure regulator, fuel damper, and fuel filter and be patient. There is no such thing as a cheap Porsche.
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PCA - Florida Citrus Region |
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08-03-2015, 03:59 PM
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Registered User
Join Date: Aug 2015
Posts: 33
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Already checked fuel pressure and fuel.filter is on itd way
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08-03-2015, 04:14 PM
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944 addict
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A loose connector on the AFM, spark plug wires in wrong order, bad or misfiring injector, timing belt skipped a tooth. Also check for a vacuum line pulled loose.
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3 944's, 2 Boxsters and one Caman S, and now one 951 turbo. Really miss the Cayman. Some people try to turn back their "odometers." Not me. I want people to know 'why' I look this way. I've traveled a long way and some of the roads weren't paved. |
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08-03-2015, 04:57 PM
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Registered User
Join Date: Aug 2015
Posts: 33
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All that's good other then timing could be a possibility. What about the dme? When they go bad are they just bad or can it do something like this?
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08-03-2015, 06:54 PM
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My friends call me, Top
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I would suspect the timing is off. Your description and troubleshooting point to timing.
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Matt '87 924S |
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08-04-2015, 06:04 AM
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Registered
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When is the last time the car was running well? How long did it sit for?
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08-04-2015, 06:20 AM
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Registered User
Join Date: Aug 2015
Posts: 33
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My guess would be 2012 sense the oil change sticker is from 2012 and the mileage is only 212 miles on the nee oil change. So 2012 is my guess and you think itd just s tooth off or something
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08-04-2015, 08:29 AM
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Registered User
Join Date: Aug 2015
Posts: 33
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Timing looks fine also
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08-04-2015, 10:09 AM
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Registered
Join Date: Jul 2004
Location: Upstate New York
Posts: 3,265
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Backfiring indicates that ignition timing is off. Since the ignition timing is controlled by the ECU, the other possibilities are the rotor (not pointing in the right place) or plug wires incorrectly positioned in the cap. Could also be the ECU is bad (very unlikely). What type of 944 is it?
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Good luck, George Beuselinck |
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08-04-2015, 10:17 AM
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plays with toy cars
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The AFM would be the second thing to check after the timing.
This is how I did mine: https://www.youtube.com/watch?v=4pFxhJO4jXc
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1983 944 - modded everything http://forums.pelicanparts.com/dto_garage.php?do=viewvehicle&vehicle_id=28317 '86 951 - under construction http://forums.pelicanparts.com/dto_garage.php?do=viewvehicle&vehicle_id=28374 |
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08-04-2015, 10:22 AM
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Registered User
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How about a weak ignition coil.
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08-04-2015, 10:28 AM
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Registered User
Join Date: May 2015
Posts: 106
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SOunds just like mine when I did plugs, wires and rotor.
I had cylinders 2 and 3 transposed on the distributor. |
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08-04-2015, 12:34 PM
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Registered
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As stated above- I would definitely check the spark plug wires
Also Remove the J-Boot and make sure there are no cracks in the rubber, while the boot is off verify that the door on the AFM (air flow meter) is moving freely - (I was helping a friend bring a 944 back to life, and found the door inside the AFM was sticking causing some rough running issues) |
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08-04-2015, 12:54 PM
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Porsche 944 NA
1986 Porsche 951
Rudolf
Blue Max
Pearl
Heidi the NA
1986 Porsche 944 NA
