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Registered
Join Date: May 2000
Location: Chester,NJ,USA
Posts: 42
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rough running until 3, 000 rpm
My 944 (1986 - non turbo) has been running very rough lately
It starts well but runs terrible when it is cold and under 3, 000 rpm. It really runs like on 3 cylinders, no power at all. When the engine is hot it is better but still not full power under 3, 000 rpm. I have no idea where to start looking ? Bad injector ? Fuel pump (the fuel pump is new) DME ? Any help would be appreciated |
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03-09-2014, 01:18 PM
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Registered
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I would check the injectors to ensure you don't have one stuck open slightly. Verify proper fuel pressure, in case you have a regulator issue. Double check the ignition components (plugs, wires, cap/rotor). Also vacuum leaks can cause weird issues and don't forget the lines that run under the intake.
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03-09-2014, 01:42 PM
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easydave
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Check for vacuum leaks EVERYWHERE!
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Easy Dave |
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03-09-2014, 02:49 PM
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plays with toy cars
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Although a vacuum leak or something is a lot more likely, inspect the AFM and test it to make sure the inner resistor track is working smoothly.
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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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03-09-2014, 05:41 PM
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Registered
Join Date: May 2000
Location: Chester,NJ,USA
Posts: 42
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Thank you for the replies. It is very helpful !
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03-09-2014, 07:29 PM
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Registered User
Join Date: Feb 2014
Posts: 8
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My guess would be the DME temp sensor.
It's easy to measure, as you don't need to dissasemble too much. Sensors and Gauges - Information, Troubleshooting, and Testing but really, anything mentioned before is a good guess! |
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03-10-2014, 01:12 AM
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Fiba-Toofah
86 NA
Heidi the NA
