 Rough cold start, Rougher hot start |
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| Canine14 |
 Apr 18 2012, 01:12 PM
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#1
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Newbie  Group: Members Posts: 2 Joined: 18-April 12 From: massachussettes Member No.: 14,393 Region Association: North East States  |
Hello 914world,
This is my first thread on the forum, thanks for having me! I have a diagnostic question concerning a 1973 914 2.0: The engine starts but won't idle without a decent amount of pressure on the gas pedal. after about 3 to 5 minutes the gas pedal can be released and the engine idles fine. After traveling about ten miles or 15 to 20 minutes, I can shut off the engine and turn it back on immediately without any problems. But if the engine sits for say 10 minutes after being run for those 20 minutes, then upon restart the engine will not idle without a significant amount of gas pedal pressure. It will actually run even worse than when started cold, almost as if the engine is running on 2 or 3 cylinders. The engine will not run well again until it completely cools, the engine is started and the gas is depressed for 3-5 minutes as stated above. I appreciate questions or ideas on what might be happening. thankyou! |
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| TheCabinetmaker |
Apr 18 2012, 01:22 PM
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#2
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I drive my car everyday Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
First, Welcome. Second, Your aar may be stuck closed. That will cause the rough ,no idle cold start. Third, Foot to floor on hot start means its flooded after sitting for a few minutes. The FI will hold fuel pressure for a half hour or better. Either an injector, ot the cold start valve is leaking. Find the hose to cold start valve in the middle of the drivers side fuel rail. Follow that hose to the cold start valve on the intake plenum. Unplug the wires, disconnect the hose and plug it. then see if it still has a hot start problem. As for the cold start, Find the aar valve and remove the hose that is not hooked to the air cleaner. Then check for a high idle at cold start. then get back to us. |
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| underthetire |
Apr 18 2012, 01:49 PM
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#3
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914 Guru Group: Members Posts: 5,062 Joined: 7-October 08 From: Brentwood Member No.: 9,623 Region Association: Northern California |
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| 76-914 |
Apr 18 2012, 01:53 PM
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#4
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,502 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California 
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(IMG:style_emoticons/default/agree.gif) if it's FI. It's not carb'd is it?
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| Canine14 |
Apr 18 2012, 09:51 PM
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#5
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Newbie Group: Members Posts: 2 Joined: 18-April 12 From: massachussettes Member No.: 14,393 Region Association: North East States |
thanks for the response! i'll check all that stuff out and get back to you guys.
It is fuel injected. |
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| mrholland2 |
Apr 18 2012, 10:15 PM
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#6
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Senior Member Group: Members Posts: 750 Joined: 7-September 11 From: Santa Maria,CA Member No.: 13,531 Region Association: Central California |
QUOTE(Canine14 @ Apr 18 2012, 08:51 PM)  thanks for the response! i'll check all that stuff out and get back to you guys. It is fuel injected. (IMG:style_emoticons/default/welcome.png) |
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