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#1
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Stumble on cold start
When I start the car from cold, it starts immediately but then the idle drops and it stumbles around for a few seconds before finding a stable idle speed. After that it runs perfect and idles flawlessly.
I'm new to Subaru's and the SVX, not not sure what/how the cold idle is controlled and what might cause this. It is a 94. Thanks |
#2
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Re: Stumble on cold start
I've been getting a stumble on cold starts lately too, except mine will quit if I give it any gas, and sometimes won't stay running. When warmed up, it's fine.
I suspect that it may be a fuel pressure issue, possibly fuel pump on its way out, because if I cycle the key on-off a couple times to prime the pump a few times, it doesn't do this. Not sure if our two issues are related.
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1992 LS-L Touring, Liquid Silver w/ Black, 110k mi. "Alice." Rebuilt title. Mods: WRX 6-CD changer, 17x8" Motegi LC-12 (16.5lbs), PWR rad, Perrin LCP, JDM v.8 6MT + R180, Koni + Ground Control (325f/280r), Earthworm Bushings. Awaiting resto. 1994 LSI The legendary "Shotgun Slade" 110k mi and still going strong! 2005 Outback XT Limited 5MT, Obsidian Black Pearl, 211k km, daily driver. 1999 Mazda MX5 base 5MT, Twilight Blue Metallic, 152k km. "Twilight Sparkle" Summer daily driver! 2007 Honda CR-V, some awful shade of light green *yawn* 1992 LS-L Touring, Ebony Mica, 176k kms. Parts car. SCRAPPED. 1992 LS-L, Dark Teal, 367k km. "Wintergreen" the winter beater.*SCRAPPED due to rust* |
#3
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Re: Stumble on cold start
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As for the OP, I would check vacuum at the manifold and fuel pressure between the filter and fuel line under the intake manifold. Make sure that the pressure stays up once he key is off, to eliminate the chance of a fuel leak.
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Cam '92 Ls-L Dark Teal 11:1 CR ECUTUNE pistons ECUTUNE .256 duration intake/exhaust cams ECUTUNE STAGE 2AV1 ECU Z32 MAF/SR20DET injectors Balanced & Blueprinted |
#4
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Re: Stumble on cold start
That makes a lot of sense, since I've also been getting erratic rad fan behaviour to boot.
This is why I'm not a mechanic after having spent the better part of the last decade trying
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1992 LS-L Touring, Liquid Silver w/ Black, 110k mi. "Alice." Rebuilt title. Mods: WRX 6-CD changer, 17x8" Motegi LC-12 (16.5lbs), PWR rad, Perrin LCP, JDM v.8 6MT + R180, Koni + Ground Control (325f/280r), Earthworm Bushings. Awaiting resto. 1994 LSI The legendary "Shotgun Slade" 110k mi and still going strong! 2005 Outback XT Limited 5MT, Obsidian Black Pearl, 211k km, daily driver. 1999 Mazda MX5 base 5MT, Twilight Blue Metallic, 152k km. "Twilight Sparkle" Summer daily driver! 2007 Honda CR-V, some awful shade of light green *yawn* 1992 LS-L Touring, Ebony Mica, 176k kms. Parts car. SCRAPPED. 1992 LS-L, Dark Teal, 367k km. "Wintergreen" the winter beater.*SCRAPPED due to rust* |
#5
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Re: Stumble on cold start
Coolant temp sensor will fix it..the sender portion with the wires might be broke..That was the cause of mine.
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#6
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Re: Stumble on cold start
thanks for the input. I'll check the temp sender. Actually I'll probably just replace it.
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#7
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Re: Stumble on cold start
There is no need to just replace it. With an ohm-meter it is very easy to test. 2k to 3k ohms when cold (65 degrees) will tell you it functions properly when cold.
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Cam '92 Ls-L Dark Teal 11:1 CR ECUTUNE pistons ECUTUNE .256 duration intake/exhaust cams ECUTUNE STAGE 2AV1 ECU Z32 MAF/SR20DET injectors Balanced & Blueprinted |
#8
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Re: Stumble on cold start
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If it starts immediately then the temp sensor is reading the temp and injecting the right amount of fuel. Maybe the Axillary Air Valve is not opening to give the fast idle that keeps it running for the 15 sec or so, till the Idle Air Valve takes over. Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#9
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Re: Stumble on cold start
On mine, it starts and revs up perfect for about a second. Then dies off and makes you think maybe it is going to quit, but catches it self and stumbles for maybe two seconds and then smooths out and runs perfect.
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