Hi!

I have a '92 190D 2.5 turbo and often, when I start the engine, the tach doesn't work, the ans light is on and the electronic idle control doesn't work. Probably other stuff don't work either but this is what I've found so far. Some times they all start working again but it happens very randomly. Sometimes it's 1min after I started the car, some times it's 5, 10 or never. Other times when I start the engine everything works just fine. Everything it's very random.

What can be the fault?

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1992 Mercedes 190D 2.5 turbo 5sp manual. EGT+boost gauges. Boost controller set to ~14.5 psi. 1 1/4 turns on full load adjustment. LPG injection. Next in the list is water injection.

I checked out another relay at a junk yard yesterday but still the same problem. Start the engine and the tach, electronic idle and abs don't work. It might have been a faulty relay, but I'm not sure.

Need some help on what might be the culprit.

Thanks

Deni

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1992 Mercedes 190D 2.5 turbo 5sp manual. EGT+boost gauges. Boost controller set to ~14.5 psi. 1 1/4 turns on full load adjustment. LPG injection. Next in the list is water injection.

It really sounds like you OVP relay, and yes you can get a bad one from a wrecking yard, I have.

John