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Wont Start after warm 200

posted by  Ferd88 on  Thu Oct 14 14:16 CST 2010
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last visit: Wed Jan 12 17:30 CST 2011
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I have 1987 240 that will not start after it's warm. The car is fine until I turn it off and try to start again. It has spark and the fuel pump is running. I did jump the fuel pump relay and it sounds OK but not sure if it's pumping enough. Can the air mass meter cause this problem? The resistance of the wire in the air mass meter is 3 ohms. Any ideas?
Thanks
Ferd88








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Classic Flooding 200

uid 40935's pic
posted by  Goatman on  Fri Oct 15 02:15 CST 2010
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last visit: Sat Jul 26 20:30 CST 2014
[RELATED]

Hello,


If the engine will NOT start after sitting, then there is likely a fuel leak into the intake manifold. Check the vacuum line of the fuel pressure regulator and the injectors for leakage.


Goatman








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Wont Start after warm...Bad Check Valve? 200

uid 18083's pic
posted by  lucid on  Fri Oct 15 02:04 CST 2010
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

A possible cause or your "warm hard start" could be a failing check valve in the fuel pump outlet. The check valve is there to aid hot starts—not to hold pressure overnight. By maintaining some pressure for a short time (the "residual pressure" spec is measured in minutes), it's meant to prevent a vapor lock in the injector fuel rail, due to heat soak from the hot engine.

A Fuel Pressure gauge is needed to test the check valve.

The time spec is measured in minutes, per Bentley page 241-10 where it says:
Residual Fuel Pressure • minimum after 20 minutes. . . .1.0-bar (14.5psi).

--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.







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