190D idel problem?

[04 Diesel]

Just got my 84 190D running again and when I come to a stop sign I can feel the car wanting to go, if I would let go of the brake it would take off. If I put it in nuetral or park, the rpms slowly start to go above 2000. What is the problem?

[whunter]

Lube all of the throttle linkage.
Check the return spring is not loose or broken.




.

[04 Diesel]

Originally Posted by whunter

Lube all of the throttle linkage.
Check the return spring is not loose or broken.




.

I checked the spring before I put it back together and lubed the throttle linkage as I put it back together. ???? What now???

[jt20]

The vacuum controlled idle control on the back of the pump is adjustable.

Loosen the locknut and I believe you spin the vacuum element to adjust fine idle.

Make sure your vacuum routing is in good order.

[weird beard]

Can't comment really on the 2.2l, but my '86 2.5 190d has an electric idle control, not vac.

Check that the throttle cable has very little tention on it, just enough that the spring on the end is just making contact with the linkage and not compressed. If the cable is too tight, the pump will not fully return to idle and will rev up slowly or rev up out of control. It may also return to idle slowly. The cable is adjustable by turning the black plastic thumb screw on the cable.

[04 Diesel]

Originally Posted by weird beard

Can't comment really on the 2.2l, but my '86 2.5 190d has an electric idle control, not vac.

Check that the throttle cable has very little tention on it, just enough that the spring on the end is just making contact with the linkage and not compressed. If the cable is too tight, the pump will not fully return to idle and will rev up slowly or rev up out of control. It may also return to idle slowly. The cable is adjustable by turning the black plastic thumb screw on the cable.

I did adjust the idel with that screw, when cold the idel is fine. When it warms up is when the idel goes up.

[Stretch]

Originally Posted by 04 Diesel

I did adjust the idel with that screw, when cold the idel is fine. When it warms up is when the idel goes up.

Generally speaking the idle is set with a warm engine - I don't have the data for your engine though. Do you have a repair manual / FSM?

[04 Diesel]

Originally Posted by jt20

The vacuum controlled idle control on the back of the pump is adjustable.

Loosen the locknut and I believe you spin the vacuum element to adjust fine idle.

Make sure your vacuum routing is in good order.

I think I will try that next. And I will check that my vacuum is ok.

[t walgamuth]

Might have bacteria in the tank. I'd try some biocide. If you do you should have black dots in the clear filter.

[04 Diesel]

Originally Posted by t walgamuth

Might have bacteria in the tank. I'd try some biocide. If you do you should have black dots in the clear filter.

Nothing in the fuel filter.

[Skippy]

I had a similar problem with an N-series Cummins that had me stumped for a while. It turned out the fuel return line was blocked.

[jt20]

Remove ALL tension from the throttle cable. It should wiggle just a little bit with your foot off of the pedal.

If that does not fix it, the vacuum system must be re-mapped with extra focus on that line that leads to the back of the injection pump.

First test should be removing that line that goes to the back of the IP. Next time you have high idle, pull that tube off and make sure the throttle cable is slack, completely.

If that does not fix it, you need to spin that metal vacuum sensor on the back of the pump, that is the idle adjustment.

[04 Diesel]

I think I fixed my idle problem, my vacuum lines were wrong. Now the only problem is the hard shifting tranny. I know there is three ways to adjust the tranny, but for hard shifts the adjustment is on the tranny. Forgot what it is called, but for softer shifts I turn it counterclockwise? Is that my next step?

[vtmbz]

Hard shift could be a vacuum problem as well. Since you had one vacuum problem, Id go there first.

[04 Diesel]

Originally Posted by vtmbz

Hard shift could be a vacuum problem as well. Since you had one vacuum problem, Id go there first.

I also have a central locking system problem, would lose of vacuum from that affect the tranny? I thought they were different systems?