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Join Date: May 2003
Location: South Orange County
Posts: 166
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Engine loads up and backfires
I have posted before, usually answers say check vacume lines.. they are OK.
When the car backfires(like a hickup, sometimes it goes dead...wait a while and it starts again. Fuel additives like techroline seem to help, short term. I can't believe I am the only one with this problem. HELP! |
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07-02-2003, 10:39 AM
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Join Date: Feb 2001
Location: Viera FL
Posts: 5,642
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Crystal ball is out for polishing this week.
Please state year and model AFJuvat
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Es geht nicht darum wie schnell man faehrt, sondern wie gut man schnell fahren kann. Ihr Brunnen der nutzlosen Porsche Information |
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07-02-2003, 11:14 AM
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Location: South Orange County
Posts: 166
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1986 N/A Manual 944, aftermarket header, k&n drop in.
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03 Silver PT Turbo - Ours 86 White 951 - His 86 White 944 Manual - Hers 98 C-4 Sons 86 Gold 944 Auto - Sons 84 Maroon 944 Auto - salvaged 78 Yellow 924 - found a new home |
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07-02-2003, 11:19 AM
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Location: Viera FL
Posts: 5,642
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OK, need some more information.
When does the car backfire? Engine hot?, Cold? after running engine hard, daily driving? Can you reproduce the problem consistantly? What kind of gasoline are you putting in it? How does the car run when it isn't backfiring? Any other modifications to the car? When was the last tune up? cap, rotor, plugs, wires, air and fuel filter? AFJuvat
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Es geht nicht darum wie schnell man faehrt, sondern wie gut man schnell fahren kann. Ihr Brunnen der nutzlosen Porsche Information |
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07-02-2003, 11:46 AM
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Location: South Orange County
Posts: 166
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In List order:
Happens hot and cold in daily around town driving. Happens infrequently, but once started (if no fuel aditive) gets more often. Using Mobil Prem (91 oct) Other than backfire runs smoothly(few misses), it does stumble as a prelude to the hickup though. Ignition is A-1 new plugs,new coil, clean cap and rotor, new wires. filter K&N (clean), new (1 month)fuel filter.
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03 Silver PT Turbo - Ours 86 White 951 - His 86 White 944 Manual - Hers 98 C-4 Sons 86 Gold 944 Auto - Sons 84 Maroon 944 Auto - salvaged 78 Yellow 924 - found a new home |
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07-02-2003, 12:40 PM
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Location: South Orange County
Posts: 166
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Also: the plugs are clean - no scaling or carbon buildup.
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03 Silver PT Turbo - Ours 86 White 951 - His 86 White 944 Manual - Hers 98 C-4 Sons 86 Gold 944 Auto - Sons 84 Maroon 944 Auto - salvaged 78 Yellow 924 - found a new home |
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07-02-2003, 12:43 PM
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Maybe a weak or broken AFM causing the load up?
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2021 Model Y 2005 Cayenne Turbo 2012 Panamera 4S 1980 911 SC 1999 996 Cab |
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07-02-2003, 01:23 PM
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Location: South Orange County
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What is your experience with rebuilt air flow meters? They are about 1/2 the price of a new unit.
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03 Silver PT Turbo - Ours 86 White 951 - His 86 White 944 Manual - Hers 98 C-4 Sons 86 Gold 944 Auto - Sons 84 Maroon 944 Auto - salvaged 78 Yellow 924 - found a new home |
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07-02-2003, 04:43 PM
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Join Date: Jul 2001
Location: Edmonton, Alberta, Canada
Posts: 4,530
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Take a look at FRwilks site.
If you pop the black cover you will see how this gizmo work..... You can sometimes make a temporary fix. At least it will allow you to test to see if it is the AF. I am not sure how you could test for a weak AFM spring ...  but a bad AFM would explain your intermittent backfires.I would suggest you look for cracks in the intake side hoses as well. AN intake leak will definitely cause backfires....... ask me how I know!!!!
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Alex - PCA Polar Region - Boxster Muncher 86' 944 Turbo - Megasquirt - 326 rwhp/340lbft @ 18 psi SOLD www.edmontonhomelife.com www.edmontonrealestate.ws |
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07-02-2003, 04:47 PM
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1985.5 Porsche 944 2.5L Supercharged 
911 SC
Panamera
