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S-Class (W140) 1991-1999: 300 SD, S 350TD, 300 SE 2.8, S280, 300 SE 3.2, 300 SEL 3.2, S320, S320L, 400 SE, S420, 400 SEL, S420L, 500 SE, S500, 500 SEL, S500L, 600 SE, S600, 600 SEL, S600L, 500 SEC, 600 SEC

Unpredictable starting

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Old Dec 9, 2006 | 07:43 PM
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gartracescort's Avatar
gartracescort
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From: UK, midlands
S500L, 1995
Unpredictable starting
Always spins over fine, but won't always catch first or sometimes second time? Had a new engine loom and rebuilt throttle body. Runs perfect when it starts. No difference hot or cold, wet or dry.

Help please.
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Old Dec 11, 2006 | 01:39 PM
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Rod Spohn's Avatar
Rod Spohn
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From: Mesa, AZ
2011 E350 Bluetec, 1996 S320 & 2006 E320 CDI Sold to my son & 2017 GMC 2500 Diesel Pick up
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What do yuou mean just spins? Turns over but doesn't start or spin like the starter is not engaging?
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Old Dec 12, 2006 | 08:03 AM
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gartracescort
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From: UK, midlands
S500L, 1995
starter motor engages and spins the engine, but engine does not run first time. This seems to be a spark issue.
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Old Dec 12, 2006 | 10:57 AM
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Rod Spohn
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From: Mesa, AZ
2011 E350 Bluetec, 1996 S320 & 2006 E320 CDI Sold to my son & 2017 GMC 2500 Diesel Pick up
Originally Posted by gartracescort
starter motor engages and spins the engine, but engine does not run first time. This seems to be a spark issue.
Well I hope this will help you not go through the hastle I did with this problem. The Machanic replaced a couple of sensors befor someone on this site jumped in with the answer. So I'll pass it along. Change out the fuel pressure regulator. ($98.21 @ Autohaus) Its very easy for you to do yourself. Its on the front right side , top by the fuel rail. ( front right looking at engine from front) The only way I was told you can check it before replasement is to pull the Vac line and smell/look for gas. Its a Vac line and shouldn't has gas in it - not even a drop. It was so easy I kick myself for not asking this forum first before spending probably $600 at the shop.
Good luck

Drive on
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