S-Class (W126) 1979-1991: 300 SE, 300 SEL, 380 SE, 380 SEL, 420 SEL, 500 SEL, 560 SEL, 360 SEC, 500 SEC, 580 SEC, 300 SD TURBODIESEL, 300 SDL TURBO, 350 SD TURBO, 350 SDL TURBO

hard start

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Old 04-13-2021, 07:22 PM
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1989 560 SEC
hard start

I have a hard start problem after letting the car sit. I noticed that there is no fuel pressure to the injectors but there is fuel pressure to be cold start valve. The injectors are new and the fuel distributor was rebuilt by CIS flow tech.The fuel distributor holds pressure overnight and I'm wondering why there is no fuel to the injectors after letting it sit
Old 08-19-2021, 05:23 PM
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1990 w126 300SE (EU) & 1989 560SEL (US Spec)
Originally Posted by richpron
I have a hard start problem after letting the car sit. I noticed that there is no fuel pressure to the injectors but there is fuel pressure to be cold start valve. The injectors are new and the fuel distributor was rebuilt by CIS flow tech.The fuel distributor holds pressure overnight and I'm wondering why there is no fuel to the injectors after letting it sit
you may have already spent some money and solved the problem. But, you need to start from the back. Fuel pumps, filter, FUEL PRESSURE ACCUMULATOR, then if you say I have 3 bar pressure, then remove and check cold start injector. MAke sure the ECU works fine to send a signal....If you already solved it, what was it?

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