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930s rule the wasteland
Join Date: Dec 2006
Location: Spotsylvania ,Virginia
Posts: 1,219
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hot restart problem? 80 930 turbo
car runs fine ,cut it off run in store 10 mins try to start just cranks
I let it sit for 20 mins it will pop then cut off it will do this for another 15 mins and then start and run. I can hear the fuel pumps running the whole time so the relay is good. when it 1st happend i tried letting the pump run for 30 seconds but it wouldnt hit. when it did fire it was misfiring but clears up after a minute. it will only do this if i cut it off for a few minute hot. otherwise it wont cut off while driving. should i start with the fuel accumulator 1st ? i do have spark off the coil and its not really humid outside. if any1 has the fix any input would be much appreciated pete
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1980 930 Turbo 1993 Corrado 1983 944 1984 944 2001 VW golf TDI |
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02-17-2007, 12:21 PM
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sudo apt-get purge 930
Join Date: Jul 2006
Location: Brandon, FL
Posts: 4,838
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Sounds like the accumulator. Put some gauges on and check residual pressure.
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL*** "Worrying about depreciation on your car and keeping mileage down is like not ****ing your girlfriend so her next boyfriend finds her more appealing" --clutch-monkey |
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02-17-2007, 12:52 PM
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930s rule the wasteland
Join Date: Dec 2006
Location: Spotsylvania ,Virginia
Posts: 1,219
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ok what if pressures dont bleed down, then where do i go?
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1980 930 Turbo 1993 Corrado 1983 944 1984 944 2001 VW golf TDI |
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02-17-2007, 01:06 PM
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sudo apt-get purge 930
Join Date: Jul 2006
Location: Brandon, FL
Posts: 4,838
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I don't know, I had that exact problem and it was the 28 year old accumulator. Replaced it and problem solved, I never had to troubleshoot further. I'm sure the experts on here will chime in with useful info that I'm unaware of. I can only relate my experience. However, check your pressure to see if that's your problem. You have to start somewhere and that's the place I'd start.
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL*** "Worrying about depreciation on your car and keeping mileage down is like not ****ing your girlfriend so her next boyfriend finds her more appealing" --clutch-monkey |
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02-17-2007, 01:15 PM
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A fellow Pelacanite
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Agreed.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG. Fitting - New service kit. Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head. 1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods. Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit. http://www.danasoft.com/sig/Iamnotanumber.jpg |
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02-17-2007, 01:23 PM
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930s rule the wasteland
Join Date: Dec 2006
Location: Spotsylvania ,Virginia
Posts: 1,219
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can i ask a stupid question? if im losing pressure hot why will the car restart no problem cold? shouldnt i have no pressure cold too?
pete
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1980 930 Turbo 1993 Corrado 1983 944 1984 944 2001 VW golf TDI |
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02-17-2007, 04:23 PM
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930s rule the wasteland
Join Date: Dec 2006
Location: Spotsylvania ,Virginia
Posts: 1,219
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you guys see injectors leak down on these motors?
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1980 930 Turbo 1993 Corrado 1983 944 1984 944 2001 VW golf TDI |
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02-17-2007, 04:25 PM
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Moderator
Join Date: Aug 2002
Location: OverlandPark KS (Kansas City)
Posts: 526
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Because the cold start injector will kick start the system. After 10 minutes the CS is off and the fuel plate pulls down and the fuel lets the car fire off. If the pressure bleeds off and the system is wihtout fuel hot is vapor locks the fuel head and takes some time to force fuel through it.
Check the rest system pressure 10 and 20 minutes rest.
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Stephen 94 3.6Turbo 6-speed AWD |
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02-17-2007, 06:28 PM
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sudo apt-get purge 930
Join Date: Jul 2006
Location: Brandon, FL
Posts: 4,838
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Like Porschephd said, vapor lock. If you don't maintain fuel pressure it bleeds off and the remaining fuel in the line vaporizes when the engine is hot. When that happens your car is trying to start on fumes. After the engine cools the fuel condenses back to a liquid, albeit a low pressure liquid. Once you start the car, the pumps bring the pressure back up and will maintain liquid seal in the fuel lines until to shut it down and vapor lock occurs again. I'm betting it cranks over a few times before starting when cold, not a lot, but more than it should. Mine did as pressure built, after replacing the accumulator it fires almost immediately. Check your pressures, it's the most basic thing you NEED to do to insure a proper running car.
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL*** "Worrying about depreciation on your car and keeping mileage down is like not ****ing your girlfriend so her next boyfriend finds her more appealing" --clutch-monkey |
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02-17-2007, 10:35 PM
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930s rule the wasteland
Join Date: Dec 2006
Location: Spotsylvania ,Virginia
Posts: 1,219
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ahhhhhhh , ok makes sense. I'll pick up a fuel filter too and replace too while im in there. 1 more thing when you replace the valve on the pump is it on the 1 in front or the 1 in the rear? this is all good stuff and really appreciate the info
Pete
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1980 930 Turbo 1993 Corrado 1983 944 1984 944 2001 VW golf TDI |
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02-18-2007, 04:43 AM
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Moderator
Join Date: Aug 2002
Location: OverlandPark KS (Kansas City)
Posts: 526
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Nope, just one in the front. That is it.
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Stephen 94 3.6Turbo 6-speed AWD |
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02-18-2007, 06:24 AM
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