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Location: Johns Creek, GA
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runs rough at times on start up
at times on cold start, the 911 will run rough and is low on power for a few miles then abruptly it clears out and runs great. it feels like its on on 7 cylinders then you flip a switch and its fine. it happens off and on but mainly if the car sat for a week or so without being driven. i have my thoughts but any ideas?
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Charles 88 911 Cab 74 TR6 88 CRX Si 79 930 #632 (sold her and survived her) |
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10-11-2016, 03:46 PM
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What year is it?
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10-11-2016, 03:56 PM
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I'd be happy if mine felt like it was running on 7 cylinders.
 Seriously though,... mine does the same thing. I envision oil fouled plug. Takes a bit to clean off and start firing.
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1987 911 Carrera Coupe 1987 Buick Grand National 1971 Plymouth Roadrunner |
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10-11-2016, 10:18 PM
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10-11-2016, 11:25 PM
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Could also be a low battery not supplying enough power to the Motronic system. Is it Motronic? If so, charge the battery before you give it another cold start & see if that makes a difference.
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'88 Carrera Guards Red '70 VW Beetle Yukon Yellow 
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10-12-2016, 05:35 PM
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Hey Cellison, i think i've got my issue figured out, and this may apply to yours as well.
I decided to pull a couple plugs just to check their condition (car is new to me) one plug out led to a compression test. Which then led to another plug, and so on.... Got to cyl. #6 and the plug is oil fouled big time ! Take a look at your plugs and see what story they tell.
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1987 911 Carrera Coupe 1987 Buick Grand National 1971 Plymouth Roadrunner |
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10-12-2016, 10:45 PM
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JLEX I think the battery is charged good but i'll look at it closer.
TORI, the plugs have been in for a while so i'll pull them to look at the condition. what was your compression especially on #6?
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Charles 88 911 Cab 74 TR6 88 CRX Si 79 930 #632 (sold her and survived her) |
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10-13-2016, 09:34 AM
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#6 was 150 (this is still good compression, but low compared to the others)
#1-#5 - 172-188
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1987 911 Carrera Coupe 1987 Buick Grand National 1971 Plymouth Roadrunner |
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10-13-2016, 09:46 AM
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If you need help with changing out/checking your spark plugs be sure to check out our article here: Porsche 911 Spark Plug Replacement | Pelican Parts DIY Maintenance Article. Good luck and hope you figure out your issue soon.
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10-13-2016, 09:46 AM
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Quote:
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10-13-2016, 09:50 AM
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