Quote:
Originally Posted by sixto
This happens with or without the ELR actuator hooked up?
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That is my understanding. Intermittent problem regardless ELR.
Think about ways to diagnose by eliminating possible causes and then testing.
Disconnect the two-pin connector for the idle control (on the back of the IP), test by driving for several days. You may need to manually adjust the idle speed up.
Disconnect the cruise control actuator rod or unplug the electrical connection.
When the engine is doing its high-rpm thing, observe the position of the accelerator cable to make sure it is slack. Also check the remaining accelerator linkages. You may need to remove the washer fluid reservoir and leave it out for the duration of all this. When I purchased my '87 wagon, a previous "mechanic" had messed up all the shift linkages to try to adjust the idle (I think) so I had to spend more than a few hours sorting that out one day. The FSM has the specs.
Once you've eliminated all the possible external causes, what is left is the injection pump. What work has been done to the injection pump? There was one fellow who "fixed" a leak from the bottom plate by installing a rubber sheet between the plate and the injection pump. The rubber sheet inside the pump rubbed on components and caused all kinds of odd behavior, which were immediately resolved when the rubber sheet was removed and the proper seal installed. Has anyone tried to adjust the pump governor?