Author Topic: 1981 Vanagon Diesel Surging idle  (Read 482 times)

May 27, 2024, 05:04:57 pm


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1981 Vanagon Diesel Surging idle
« on: May 27, 2024, 05:04:57 pm »
I have a problem with my 1981 Vanagon Diesel.
I put a new fuel pump in.
It starts Right up now but after about a minute the RPM's accelerate and you have to turn it off.
One you do, it resets. You can start it up again and does it all over again.
Any solutions, suggestions or Thoughts?
« Last Edit: May 27, 2024, 05:08:11 pm by Yoyota »

Reply #1May 27, 2024, 10:22:32 pm


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Re: 1981 Vanagon Diesel Surging idle
« Reply #1 on: May 27, 2024, 10:22:32 pm »
That almost sounds like it is getting oil in the intake somewhere and that is acting like additional fuel causing the RPMs to climb.  I would look into the hoses coming off the top of the valve cover and maybe any from the block itself. 

That is my only thought at this time.  Brain barely on idle tonight.

Reply #2May 27, 2024, 11:52:15 pm


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Re: 1981 Vanagon Diesel Surging idle
« Reply #2 on: May 27, 2024, 11:52:15 pm »
 I've had the RPMs hang and rise when the max fuel screw is in too far.
 I think most commonly it was caused by a pissing injector.
Fuel doesn't burn well and remains until the next time around, where it's added to the next squirt.
Lots of white smoke?

 And I'm going to mention that sometimes the pump can be put on 180 degrees out.
Not sure how, but others,.. and I have done it, long ago.

Maybe air in the fuel, do you have clear lines to and from the pump?
Tornado red, '91 Golf 4 door,
with a re-ringed, '84 quantum, turbo diesel, MD block