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too lean or too rich?
So far so good for my '77 2.7 cis "MM" engine. I have almost 2,000 miles on it and many at 5,000+rpm. However, after the engine cools down, it doesn't want to start. It 'seems' like it isn't getting fuel or? It feels like I should 'pump' the gas pedal. (I know) It cranks over very fast, and after a while it almost wants to start, but doesn't quite make it. Is there a step by step elimination procedure that would lead to the problem?
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05-13-2005, 06:30 AM
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Senior Member
Join Date: Feb 2000
Location: Lacey, WA. USA
Posts: 25,308
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You probably have the common hot start problem because residual pressure is bleeding off your fuel system due to a leaking check valve, fuel accumulator or injectors.
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Man of Carbon Fiber (stronger than steel) Mocha 1978 911SC. "Coco" |
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05-13-2005, 06:33 AM
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Join Date: Mar 2004
Location: US
Posts: 1,621
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Do a search, there are a bunch of threads on cold start and hot start problems. Could be a problem with your WUR, check valve, fuel accumulator, etc. You may start by checking the cold pressure of your WUR, to eliminate that possibility. Normally the WUR can cause cold start problems.
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05-13-2005, 06:37 AM
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I searched and found some great discussion and learned what WUR stands for. However, 1) where is the darn thing, and 2) how does one know if it is broken, and 3) which way do you turn it?
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05-13-2005, 06:50 AM
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Somewhere in the Midwest
Join Date: Oct 2001
Location: In the barn!
Posts: 12,499
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Oh boy...do you have a lot to learn
 no, really, read up on CIS, wish Jim Williams' page...
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05-13-2005, 08:06 AM
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Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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Do a search on residual pressure.
Joe |
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05-13-2005, 08:16 AM
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Ah ha! I found the little bastard as well as the aticles. I'm sure I'll be ready for a quiz in no time. Thanks! (I think)
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05-13-2005, 08:39 AM
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Join Date: Jul 2002
Location: Southern California
Posts: 5,067
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"so far so good" and "MM engine" in the same sentence? You don't see that every day.
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1984 Targa |
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05-13-2005, 09:04 AM
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Join Date: Jul 2004
Location: Vancouver BC Canada
Posts: 490
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I had/have the same problem. Unfortunately the cause has not yet been totally sorted. Here's my thread..
New plugs didn't fix it :( Nik
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1980 911 SC widebody, Black/Black. 1993 BMW M5. Silver/Black. |
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05-13-2005, 09:05 AM
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WUR not it
2 questions:
Well I r&r'd the WUR today, but the car still won't start. 1) So, is there anything else a DIYer can r&r? Or is it time for my mechanic to fix it? I just hate towing it. 2) Do you think it would push start? |
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05-21-2005, 01:50 PM
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Join Date: Dec 2004
Location: Novato, CA
Posts: 3,064
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Quote:
Look at the accumulator and fuel pump check valve as mentioned earlier. You will need the fuel pressure gauge to check these properly. ianc
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BMW 135i. Nice. Fast. But no 911... "I will tell you there is a big difference between driving money and driving blood, sweat and tears." - PorscheGuy79 |
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05-22-2005, 08:17 AM
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Carpet Ride
Blue Persusasion
