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Old August 17th, 2009, 11:29 AM
Status: Offline
Scott S
1988 RRC Truck Cab
Join Date: Jul 2009
Location: Portland, Or
Posts: 7
Rough Idle

88 RRC 4.0

I've replaced cap, rotor, and wires all having no affect on the idle. Hooked it up to a scope and noticed that killing the #3 cylinder does not affect it at all, it doesn't seem to care if it's hooked up or not! Changed out the #3 plug with a spare and it still runs the same with the plug wire hooked up or not. It runs with no missing or anything under load, it just happens at idle

I pulled the power plug to the #3 injector thinking that the problem is now fuel related and started it up. It didn't seem to make a big difference so I pulled the #5 injector plug and it ran essentially the same (was hoping for a big difference). I'm running out of ideas that are cheap/easy to do to this thing, is there anything else I can do that I might have missed? The idle has been low ever since I replaced the stepper as well and swapping steppers from my dad's D90 makes no difference.

Follow-up Post:

Just listened to the injectors and they all seem to be firing normal but we're now thinking that a bad spray pattern could be the culprit.
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