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Rough Idle and acceleration ( Help )
Just went to lunch , car was running perfect.
Started it up and now have some surging rough idle and some loss of power with acceleration . Filled up gas tank Saturday and added 3 oz ( as per bottle ) of Lucus gas treatment for valves and cylinders . Driven about 20 miles since filling . Do you think this might cause it or do you think I have other problems ? Fouled plug ? Help !  Vinnie in Ventura 1989 911 3.2 Silver Anniversary Edt Last edited by vincenza; 08-29-2005 at 02:28 PM.. |
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08-29-2005, 01:58 PM
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Join Date: May 2004
Location: Encinitas (San Diego CA)
Posts: 4,495
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There are many reasons this could happen. Vacuum leak (maybe a hose split), plug wire to a cr@p, etc, etc. Fuel seems only one of many possibilities.
Can you give more information that may be clues? Does it rev freely or stumble at a certain RPM? Did you drive though a HUGE puddle? Did it pour down rain, etc, etc Does it behave at Wide Open Throttle? Doug
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1971 RSR - interpretation |
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08-29-2005, 03:36 PM
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No Water . Stumbles at beginning acceleration , then stablizes.
Could it be O 2 sensor ? |
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08-29-2005, 03:39 PM
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GFCC
Join Date: Apr 2002
Location: Phoenix, AZ
Posts: 1,785
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Vince, Did this happen at all before you last gas fill up? If not you may have gotten a bad tank of gas (A bottle of octane booster will help that).
Need more info though.
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Jeff 1976 911 Coupe w/ Euro 3.0 - Sold 1987 Carrera Coupe - Sold 1999 Carrera Cabriolet - Current |
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08-29-2005, 03:47 PM
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Jeff it was surging at idle about a week ago but stopped .
I added Lucas Treatment 2 days ago and now the problem is back and constant . |
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08-29-2005, 03:51 PM
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GFCC
Join Date: Apr 2002
Location: Phoenix, AZ
Posts: 1,785
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Vince, There are a number of things that could be causing this but The #1 place to start is the DME relay (Located under the drivers seat, it is a small black relay). Try puting in a new one of these (you should always carry a spare in the glove box).
The second thing I would look at is the Idle Speed Control Valve. It may need to be cleaned.
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Jeff 1976 911 Coupe w/ Euro 3.0 - Sold 1987 Carrera Coupe - Sold 1999 Carrera Cabriolet - Current |
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08-29-2005, 04:10 PM
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had a similar problem
I had a similar problem for a while which went away at full throttle. idle was bucking and the part throttle response was erratic with a good amount of hesitation. search for the thread i did on the subject entitled (i think) 3.2 Hesitation Problem. It turned out to be a bad injector but I managed to replace much of my ignition system in the process of located the problem.
I suggest the following: DME, then spark plug wires, then plugs (maybe there is one that is fouled), then injectors. Good Luck
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oversteer...there is no substitute |
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08-29-2005, 04:52 PM
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1985 Carrera Coupe
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vincenza,
Did you fix the problem? What was the source?
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Art |
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08-18-2007, 05:15 AM
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1988 Porsche Carrera 3.2 
