Semi-frustrating news, but not too bad...
I have been working to diagnose a recent surging problem. It occured only after the engine had sat overnight, and once the cold start/advance/high idle had quit, so did the surging. I replaced the fuel filter, and did the lift pump at the same time as the turbo. Things were nice for a while.
Now that the mornings are starting to get chilly, the cold surge has come back, and this time it's doing it while warm too. It's not a huge surge; just small enough to irritate the snot out of me. It's +/- 50 rpm from warm and cold idle which are 700 and 850 respectively.
I dug out my paperwork for the injector pump rebuild to get the phone number of the rebuilder. After looking at the invoice and work order, I noticed that the rebuild specs quoted on the work order were the military specs that the pump started with while the invoice quoted a price for a 4911. Not that 1987 military specs are bad, but I specifically requested a 4911 rebuild.
Next time I'm in Dallas, I'm going to run by the rebuilder, and they're going to open up the pump on the truck, do an internal idle adjustment, and double check the fuel rate.
They've always done quality work, and their customer service is top notch, so I'm interested in seeing how they handle this. [img]smile.gif[/img]
It sure would be nice if I could just look on the pump's tag, but that doesn't mean much anymore.