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Honey Badger
Join Date: Oct 2001
Location: North Pole, AK
Posts: 1,045
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odd problem
Occasionally (about once every couple weeks or so) when I shut my car off it stops momentarily then turns over a few more times then dies. When I go to turn it back on it is difficult to start but always does after a few seconds.
It usually doesnt bother me but it seems to be getting a little more frequent. Does anyone have any ideas? Thanks.
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1978 911SC 1953 Piper PA-18A USAF EOmfD |
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01-14-2002, 05:48 PM
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Registered
Join Date: Jul 2001
Location: new orleans, la, united states
Posts: 135
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ok, shawn wanted me to post this:
"using cheap grade gas, like 87, can cause your car to diesel when shutting off, causing it to sputter a bit. the taking a lont time to start back up has to do with the check valve in your fuel pump. different problems, same cause, FUEL.
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1987 944na, black on black, sex change(auto to MANual), msds headers, europroducts.net chip, msd 6a ignition system, msd blaster 2 coil, nology hot wires, aluminum interior from www.presigepartsco.uk, bad ass stereo system, badass alarm system, momo combat shift knob |
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01-14-2002, 06:13 PM
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i agree with shawn..it's prolly just cheap low grade gas... add a can of octane booster if u can't get better gas.
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01-14-2002, 06:26 PM
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I was thinking leaky injectors...
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'89 951 Alpine White, Black Leather |
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01-14-2002, 06:49 PM
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carbon buildup in the cylinder head can serve as an ignition source that can cause dieseling. try running a bottle of techron through.
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01-14-2002, 06:59 PM
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Inproper mixture setting. Unburnt fuel in the head like Blackfoot stated.
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2021 Model Y 2005 Cayenne Turbo 2012 Panamera 4S 1980 911 SC 1999 996 Cab |
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01-14-2002, 08:24 PM
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Honey Badger
Join Date: Oct 2001
Location: North Pole, AK
Posts: 1,045
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hmmmm... yes I do use 87. I'll probably use a bottle of Techron, and if it still does it I will upgrade my gas. 110 octane, oh yeah! no, not really just 89/92.
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1978 911SC 1953 Piper PA-18A USAF EOmfD |
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01-15-2002, 04:52 PM
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Registered
Join Date: Jun 2002
Location: Hillsboro, Or
Posts: 64
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i have that same problem but i use supreme gas, it only does it once in awhile, when i change my wires from oem ignition system to my aftermarket ignition system it helps for a little bit then it does it again then i have to change igition system back to oem. it also jerks a bit while driving. any help???
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10-22-2004, 02:55 PM
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Join Date: Dec 2002
Location: St Paul MN
Posts: 344
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So does everyone here swear by Techron? My mechanic who is very familiar with 944s told me to try using it to clear up some of the cold running problems I have had, because he thinks its related to drity injectors. Also, has anyone had good luck with physically cleaning the injectors?
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'84 944, '05 GTO |
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10-23-2004, 12:03 AM
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Join Date: Jul 2001
Location: Edmonton, Alberta, Canada
Posts: 4,530
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Kenne944..........
I would look at the rest of your ignition system as well. I am venturing that there is something else loose in that area. When you are swapping wires something is being affected. Check your distributor/rotor as well. I also had a hell of a time with an injector harness that was shorting that was giving me similar issues as well. Just don't start throwing parts at it..........systematically check each one. NKN.......... Techron... It wont hurt. To be honest I have never used it. I have always tried to use good gas and never let the tank go below 1/4. I am sure dirty injectors would benefit but to what extent probably depends on the contaminant. They do have a screen in them that is meant to catch particles wether the techron will be enough to remove any foreign bodies within the injector/fuel lines I am sure its hit and miss... In regards to cleaning injectors yourself Socal (uhmmm haven't seen him in a while??) swears by it. IMO I dont think its a do it yourself project but if you know what you are getting in to......... then go for it. I wont explain the procedure (search) but it involves flammable liquid and compressed air.  RCengineering will also do the service for you if you dont want to tackle it.
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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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10-23-2004, 06:00 AM
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Non Compos Mentis
Join Date: May 2001
Location: Off the grid- Almost
Posts: 10,594
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Carbon build-up. You need to go drive the car hard to burn it out.
"Italian tune-up" time. Your car is telling you it wants to spend a day at the track. Repeat as neccessary. |
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10-23-2004, 07:50 AM
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Join Date: Jun 2004
Location: NY
Posts: 845
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hmm i guess all that 93 Ive been running doesnt help LOL. Cept that the last 10-15 minutes to work I beat the hell out of my car..and it doesnt diesel like other times where I would just cruise to work.
Its kinda a love hate relationship. A Euro-rebuilt motor like mine with 10.6:1 compression doesnt seem to like anything else than 93, because it will knock, yet the car diesels if I just drive it normal. I have a small leak in one of the o-rings..I should get around to replacing all of them and cleaning the injectors. My advice? beat the hell out of the car and wind it out and burn all that crap out. I forgot how many times between shifts my car would belch black smoke out the pipe. I wonder if the wilks chip will cure the over richness between shifts...or just make me blow smoke all the time under hard acceleration LOL.
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1985 944 / 2007 335i / 1987 325is / 1985 535i / 1999 528iT / 2006 X5 |
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10-23-2004, 09:50 AM
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Registered
Join Date: Jul 2004
Location: Louisville KY
Posts: 143
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I can get 114 octane where i live. Would the car like it, or would it be a waste of money?
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1983 944 Copenhagen Blue MODS: ENGINE: Firebraid 9mm plugwires. Weltmeister Throttle Cam, Dansk exhaust. lo-temp thermostat & fan switch, aluminum radiator. SUSPENSION: H&R 250lb springs, KYB GR-2 struts(front) Bilstien Shocks(rear), Racing Dynamics strut bar, APPEARANCE: 15" Phone Dial wheels, a-pillar w/ VDO H2O and volts gauges. 1987 944-S Montego Black -needs your help |
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10-23-2004, 11:38 AM
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Registered
Join Date: Nov 2003
Location: Calgary, AB
Posts: 1,883
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Waste of money. Unless you are running really high boost, you don't need above 89/92. I run 87 octane in mine, never had any dieseling problems, however I do have a tendency to let it rev up sometimes. Sees 5k on a daily basis.
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2010 Hyundai Elantra Touring, GLS 5 speed, Indigo Blue Metallic. 2.0L of Korean fury! Buy my parts! |
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10-23-2004, 01:31 PM
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Join Date: Nov 2002
Posts: 246
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I swear by techron. I use it in all my vehicles, one bottle, twice a year. It cleared up a bad ping problem I had in the Mustang and increased by gas mileage significantly in the Tahoe and Porsche.
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10-24-2004, 06:40 AM
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Custom User Title
Join Date: Oct 2002
Location: Miami
Posts: 4,294
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If anyone remembers my non-famous post on injector cleaning, I did do it when I resealed them. It involved a bicycle pump, carb cleaner, a 9V battery, and way too much time. Lemme find the post...
And I did notice a smoother idle after doing it. |
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10-24-2004, 08:52 PM
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Custom User Title
Join Date: Oct 2002
Location: Miami
Posts: 4,294
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10-24-2004, 08:56 PM
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85.5 Porsche 944 2.5L 8V 
1989 Porsche 951 2.5L Turbo I-4 
1986 superior water-cooled porsche 951 2.5
1985.5 Porsche 944 2.5L Supercharged 
911 SC
Panamera
