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hot start
Did a search on this, didn't really find anything to match my specific problem.
When I first start my car in the morning, it fires strong and true immediately and runs very smoothly. After it warms up and I drive it a bit, however, if I stop and have to restart it after a short period of time it doesn't want to start... it kind of stumbles after several cranks. Once I get it started, it runs rough for about 10 sec and then smooths out completely. If I rev the engine, it might stumble for a second, but it helps expedite the smoothing-out of the engine. The longer I let the car sit between driving (hence, the more chance it has to cool down), the easier it starts. For example, if I stop for gas, it stumbles quite a bit when I try to start it. If I have dinner somewhere and come back to the car after an hour or so, it takes a few cranks to start but then runs harshly for a few secs. If I work a shift (about 4 hrs), the car will start and run fine. The closest thing that came up when I did a search suggested that my starter might be going? Is this plausable?
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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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09-18-2005, 08:39 PM
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Registered
Join Date: Jul 2003
Location: Cincinnati, OH
Posts: 1,025
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starter wouldnt cause it to run ruff. its not the DME relay is it? or s cold solder joint somewhere else?
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Special Edition 924S 1988 <- SOLD! Asking if you should replace that timing belt is like asking if you should re-use a condom that may have in hole in it with a hooker. |
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09-18-2005, 09:33 PM
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Parrothead member
Join Date: Jul 2003
Location: Monmouth county, NJ USA
Posts: 13,833
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definately not a starter problem. Have you changed the fuel filter recently.
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Vinny Red '86 944, 05 Ford Super Duty Dually '02 Ram 3500 Diesel 4x4 Dually, '07Jeep Wrangler '62 Mercury Meteor '90 Harley 1200 XL "Live your Life in such a way that the Westboro Baptist Church will want to picket your funeral." |
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09-19-2005, 04:01 AM
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Join Date: Jun 2005
Posts: 8
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sounds almost like vapor lock, or maybe your gas cap is going bad, pressure building in tank??
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09-19-2005, 07:05 AM
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Fuel pressure regulator, maybe? I did a search yesterday on them, and it seems they can fail in several ways, giving a ton of different symptoms. Yours match some of what I found. Not sure, though. Can you recreate the problem and check your fuel pressure?
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1983 944 - Sable Brown Metallic / Saratoga / LSD : IceShark Light Kit |
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09-19-2005, 07:15 AM
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CJ -
Had the same issue (intermittently). Hot starts, real rough starting. Though I never had a non-start condition. Most noticable after running into the gas station for 2 minutes druing the summer in 90 degree weather. Mentioned it to my mechanic when I had my car there beginning of august for belt retentioning. Of course I couldn't duplicate it for him so it never got resolved. Been less of an issue since the weather has gotten cooler. I'm looking for an answer too. I posted on it here & at clarks with little success. 
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''87 944na 85k C02 / M158 / M418 / M425 / M431 / M454 / M533 / M650 / M946 '94 Oldsmobile 88 Royale (winter beater) Its not what you drive, its what drives you. |
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09-19-2005, 08:25 AM
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Join Date: Jun 2003
Location: Phoenix, AZ
Posts: 1,327
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check valve out the the fuel pump may be leaking.
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87 951, K27/6, Almond Beige, 17" Turbotwist 87 944S, alpine white, 5sp died a violent death 84 944, silver/brown, auto, gone but not forgotten "may the force be with you" |
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09-19-2005, 09:55 AM
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Writer/Teacher
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Fuel filter was changed about 2 years ago... shouldn't be bad already, non?
Check valve - would this be leaking gasoline? I will definitely take a look at this! Well, I haven't had a "no start" yet... I will check my fuel pressure asap. as this seems to be more of an annoyance than a real problem, I might just have my mechanic take a look at it really quick
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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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09-19-2005, 11:41 AM
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Location: Phoenix, AZ
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depends how many miles/how many times you went into "r" part of the gage and sucked garbage into the tank.
btdt. no, it leaks pressure in the fuel rail back into the tank.
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87 951, K27/6, Almond Beige, 17" Turbotwist 87 944S, alpine white, 5sp died a violent death 84 944, silver/brown, auto, gone but not forgotten "may the force be with you" |
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09-19-2005, 06:48 PM
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Politically Incorrect
Join Date: Aug 2005
Location: Hoover, Alabama
Posts: 1,494
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I had a similar problem. The air intake j-boot was missing the hoze clamp at the AFM and therefore loose. Darndest thing - the clamp just disappeared!
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Edek '87 924S '91 535i |
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09-19-2005, 09:37 PM
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Location: Melbourne, Florida
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This can also be caused by a leaking injector(s) (leaking gas into the cylinder anfter shutting of the engine). The extra gas helps on cold starts, but kinda floods out on warm starts.
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1986 951 |
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09-20-2005, 07:55 AM
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Join Date: Oct 2003
Location: CT
Posts: 624
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New FPR absolutely fixed that for me.
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1995 993C4 guards red 1988 944S alpine white |
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09-20-2005, 03:53 PM
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Join Date: Jun 2005
Location: backwoods, alabama
Posts: 331
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sounds like your car is running rich for some reason or another. like robm said, the car needs extra fuel when the engine is cold, but after the engine is warm it's overkill. check the temperature sending unit in the head. there are two, one for the gauge and one for the fuel injection. if the car thinks the engine is cold it would keep dumping extra fuel into the engine.
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86' 951 k26/27 hybrid turbo 01' audi s4 98' TDI jetta 96' 933tt AWD LS1 |
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09-20-2005, 04:05 PM
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rob c
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Quote:
i will check clarks aswell 
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07-15-2008, 02:40 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 NA
1987 Porsche 944 2.5L 4 Cyl, 8 Valves
1989 Porsche 944s2 3000cc straight 4
