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Registered
Join Date: Sep 2001
Location: Columbus, OH
Posts: 1,011
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Fuel pressure, starts and dies
Yesterday, for the first time, (it was warm out), when I started the car, it would start up, but then the tach would drop to 0 and it would die. Upon re-starting, it was fine. I am guessing a problem with the fuel pressure leaking down so it is not getting enough fuel on start up. This happened about 4 times on 4 startups. Car runs fine, otherwise. Where do I look first?
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Doug 79 SC Targa w/ ITBs, 2004 Cayenne Turbo Last edited by na2ub; 03-22-2012 at 06:03 AM.. |
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03-22-2012, 05:19 AM
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Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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when it dies, do any of the dash lights come on? oil, alt, IE, is there electrical power?
if it has been sitting, i would be looking at the plunger in the FD. just some other things to look at if it has been sitting. air leaks stuck/frozen advance in dist if you have gauges, never hurts to check cold control pressure
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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03-22-2012, 07:09 AM
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Join Date: Oct 2005
Location: Capistrano Beach, Ca.
Posts: 7,235
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Quote:
Before you start up next time, pressurize the system by turning on the ignition, removing the air filter, and gently lifting on the plunger in the intake until the injectors squeal. If the engine now starts without dying shortly thereafter, you likely have a residual pressure problem. If it still dies, the problem is elsewhere.
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L.J. Recovering Porsche-holic Gave up trying to stay clean Stabilized on a Pelican I.V. drip |
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03-22-2012, 08:05 AM
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RETIRED
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CIS needs fuel pressure, the best diagnostic is pressure gauges. Our host carries them. Specs are in the Bentley manual.
Hot start is usually the check valve in the pump neck.
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1983/3.6, backdate to long hood 2012 ML350 3.0 Turbo Diesel |
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03-22-2012, 10:43 AM
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Registered
Join Date: Sep 2001
Location: Columbus, OH
Posts: 1,011
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The symptoms occur for both hot and cold starts. Would some techron help if it is the plunger in the fuel distributor? I will bust out the bentley. Thanks for the ideas to start with.
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Doug 79 SC Targa w/ ITBs, 2004 Cayenne Turbo |
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03-22-2012, 04:03 PM
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RETIRED
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Techron is pretty mild. I would do Seafoam...change the oil afterwards.
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1983/3.6, backdate to long hood 2012 ML350 3.0 Turbo Diesel |
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03-22-2012, 04:10 PM
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Da cab
