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Help me Diagnose my Former Car!
Well, as most of you know, the buyer of my former 944 picked up the car today, and the car broke down for him on the way home (after running perfectly for me for the entire summer).
Well, maybe "broke down" is a little harsh. The buyer lives about 30-40 mins away; about 30 mins into the trip, the engine seemed to "lose power," started "bucking". He pulled over, and shut the car off. After letting the car sit for 10 mins or so, he started it again and he was able to drive the rest of the way home without incident. I am thinking some kind of fuel delivery problem. O2 sensor?
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Current Stable: Black 07 Porsche 987 Cayman S: Long-Tube Headers; FabSpeed Exhaust; VividRacing ECU Tune; IPD Plenum; 997GT3 Throttle Body. Blue 1983 Porsche 928S. 1985.5 Porsche 944 Rat Rod. 2011 Acura MDX. 2008 Mazda 3. Gone But Not Forgotten:Garnet Red 86 Porsche 951("The Purple Pig"). Alpine White 83 Porsche 944 ("Alpine Wolf"). Guards Red 84 Porsche 944. |
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09-09-2006, 07:34 PM
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Writer/Teacher
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BTW, I could be a jerk and say "hey, the warranty ends at the driveway, buddy," but I'm not a jerk, and told the buyer I would try to help him fix whatever is wrong.
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Current Stable: Black 07 Porsche 987 Cayman S: Long-Tube Headers; FabSpeed Exhaust; VividRacing ECU Tune; IPD Plenum; 997GT3 Throttle Body. Blue 1983 Porsche 928S. 1985.5 Porsche 944 Rat Rod. 2011 Acura MDX. 2008 Mazda 3. Gone But Not Forgotten:Garnet Red 86 Porsche 951("The Purple Pig"). Alpine White 83 Porsche 944 ("Alpine Wolf"). Guards Red 84 Porsche 944. |
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09-09-2006, 07:35 PM
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Offering him to help fix it is the best bet. Things that come to mind about the problem.. fuel filter, dirty injectors, sticky air flow meter.
The bucking sounds as it it was choking out, thats why I think its could be the fuel systems especially if it was fine 10 mins later. Maybe SoCal would have better ideas.
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Craig - 86' 944 N/A Black <-----Daily driver under going a fresh motor install to resume daily driver duties Past: 89' 944 S2 Guards Red Now in the hands of a Pelican who has been wanting another p-car |
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09-09-2006, 07:57 PM
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Christine
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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09-09-2006, 08:57 PM
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Writer/Teacher
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Yeah sure seems that way, doesn't it.
But seriously... any ideas?
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Current Stable: Black 07 Porsche 987 Cayman S: Long-Tube Headers; FabSpeed Exhaust; VividRacing ECU Tune; IPD Plenum; 997GT3 Throttle Body. Blue 1983 Porsche 928S. 1985.5 Porsche 944 Rat Rod. 2011 Acura MDX. 2008 Mazda 3. Gone But Not Forgotten:Garnet Red 86 Porsche 951("The Purple Pig"). Alpine White 83 Porsche 944 ("Alpine Wolf"). Guards Red 84 Porsche 944. |
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09-09-2006, 09:34 PM
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Registered
Join Date: Jul 2001
Location: Edmonton, Alberta, Canada
Posts: 4,530
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When did it buck......
at idle........wot .........or just cruising. There could be a tear/loose j-boot. Whats the last thing YOU touched. 
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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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09-09-2006, 09:56 PM
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The usual. Has to do it continuously for a diagnosis.
Also the driver has to "know" the car. More experience driving it.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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09-09-2006, 10:08 PM
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Back from Beyond
Join Date: Nov 2004
Location: Alberta, Canada
Posts: 2,697
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Recent rain? Did he drive through puddles? (Fishing here...) Maybe TPS, maybe vac leak. Did the bucking clear up at WOT? Was idle smooth?
Probably just gremlins.
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'88 944 Auto - project, kinda '87 944 Auto - died saving my wife '84 944 5SP - crushed under shop roof during snow storm All others GONE! |
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09-10-2006, 10:14 AM
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Burn the fire.
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Tell the new owner to sign up here and post all the details
 That's how you pass the baton, I reckon...
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[x] Working | [_] Broken: 2017 Victory Octane [x] Working | [_] Broken: 2005 Ram 1500 SLT w/5.7L Hemi "Drive it like you stole it." |
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09-10-2006, 10:50 AM
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Probably reached the rev limiter.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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09-10-2006, 12:23 PM
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Dog-faced pony soldier
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His problem now. I'd suggest to him that he check all the vacuum lines (a leak will definitely cause bucking and surging) and be polite about it, but if he's gonna' own a 944 he better learn to diagnose and fix things on his own. No time like the present.
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A car, a 911, a motorbike and a few surfboards Black Cars Matter |
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09-10-2006, 01:41 PM
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Try another DME relay.....sometimes they start to act up, doing things like you describe, just before they fail completely. Any time any 944 owner is having some kind of fuel delivery related problem, the first thing on the list to check is the DME relay.
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09-10-2006, 05:46 PM
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Quote:
Very true.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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09-10-2006, 07:00 PM
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Writer/Teacher
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Good advice.
He didn't contact me today, but I will pass it on if he calls me tomorrow.
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Current Stable: Black 07 Porsche 987 Cayman S: Long-Tube Headers; FabSpeed Exhaust; VividRacing ECU Tune; IPD Plenum; 997GT3 Throttle Body. Blue 1983 Porsche 928S. 1985.5 Porsche 944 Rat Rod. 2011 Acura MDX. 2008 Mazda 3. Gone But Not Forgotten:Garnet Red 86 Porsche 951("The Purple Pig"). Alpine White 83 Porsche 944 ("Alpine Wolf"). Guards Red 84 Porsche 944. |
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09-10-2006, 09:28 PM
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Registered
Join Date: Feb 2005
Location: Central Washington
Posts: 457
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My car always does that after I wash it.
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09-10-2006, 10:47 PM
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Registered
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Quote:
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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09-11-2006, 06:20 AM
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Registered
Join Date: Feb 2005
Location: Central Washington
Posts: 457
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Quote:
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09-11-2006, 02:23 PM
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Registered
Join Date: Apr 2006
Posts: 5,179
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Quote:
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M |
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09-11-2006, 02:36 PM
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2007 Porsche Cayman S
The Viridian Falcon
SOLD! -- The Purple Pig
SOLD! -- Mighty Mouse
SOLD!! -- Alpine Wolf
1983 Porsche 944 2.5 liter
2017 Victory Octane
2005 Dodge Ram 1500 SLT
