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Engine revs dive down upon slowing down.

  • Woodways3
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2 years 11 months ago #17529 by Woodways3
Engine revs dive down upon slowing down. was created by Woodways3
Hi its Nigel  E3 djet .I have the engine C/O set to around 3.5 % and the idle speed around 980 RPM .Every time the car slow,s down the rev counter drops to around 200/250 rpm then comes back up to normal. How can i stop the revs going so far down ,or is this normal ? ( My previous no starting problem turned out to be a small wire had come loose which in turned cut out the main relay.

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  • Dr-DJet
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2 years 11 months ago #17533 by Dr-DJet
Replied by Dr-DJet on topic Engine revs dive down upon slowing down.
Hi Nigel,

welcome to Jetronic.org. What you describe is not normal and I recommend that you open a new thread where you describe in more detail your loose wire and what you have done so far.

Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107

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2 years 11 months ago #17535 by Woodways3
Replied by Woodways3 on topic Engine revs dive down upon slowing down.
I thought for a minute id have a answer to my post !

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2 years 11 months ago #17539 by Woodways3
Replied by Woodways3 on topic Engine revs dive down upon slowing down.
An auto electrician found the loose wire on a contact block which was on my top servo of two.This was causing the main relay to fail. Nothing else to say except it fixed my car.

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2 years 11 months ago #17540 by Woodways3
Replied by Woodways3 on topic Engine revs dive down upon slowing down.
I thought by now someone would know the answer ????

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2 years 11 months ago #17550 by nordfisch
Replied by nordfisch on topic Engine revs dive down upon slowing down.
Hi Nigel,
the question is....?

I can't believe the engine really slows down to 250rpm.
I don't know one single car or bike engine that is able to run with such low rews.

Did you check this with another instrument?

Another idea: Does the engine has a dash-pot installed at the throttle?
Maybe this could prevent the TPS from switching the idle contact as long the throttle isn't fully closed.

Regards
Norbert

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