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Old 01-06-2009, 08:49 PM   eBay Motors  #1 (permalink)
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rough idle after warmup on 93 6.5

I have a 93 chevy with 6.5 TD. Mechanical injector pump so there is no PMD to overheat. I've replaced a lot of stuff and got it so that it starts up fine and runs fine until it warms up.

I read an article about the mechanical pump that said there is a High Pressure Cold Advance solinoid in the injector pump that advances the timing about 6 degrees until the engine reaches a certain temp which is detected by the coolant temp switch.

If my engine runs fine with timing advanced by the solinoid, does my normal timing need to be advanced? If so how would you do that? Does something need to be adjusted? Is my injection pump bad or could it be something else like leaking air.

I would think that if it runs fine until it warms up, the IP would be OK but maybe I'm wrong. I don't want to spend the $ on a new pump and find out I have the same problem.

Thanks to all!

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Old 01-06-2009, 09:15 PM   eBay Motors  #2 (permalink)
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may be the oil pressure switch,idk if the 6.5's had a kill switch on them...
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Old 01-06-2009, 09:55 PM   eBay Motors  #3 (permalink)
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Already replaced the oil pressure switch, fuel pump relay, lift pump, glow plugs, glow plug controller, injectors, and CDR valve. Put new connectors on the glow plug wires.

Before I did all that, you could hardly get it started.

It runs great when I first start it, then after it warms up, it acts like its about to die. The engine starts rocking side to side making the whole truck shake.

I want to drive it down the road a little and see if it smooths out but it was leaking coolant and I had to get a heater hose connector. I haven't put the connector on yet because its been raining two days straight. I will once it stops raining.

You can drive it like it is, but something ain't right.
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Old 01-06-2009, 10:30 PM   eBay Motors  #4 (permalink)
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Man thats strange. I know about the newer 6.5's with the pmd but not the older ones. Even with that I cant think of what could cause the truck to do that.

The only thing I could think of is if the fuel pump isnt timed right. But I, not even sure how you'd time it
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Old 01-16-2009, 05:17 PM   eBay Motors  #5 (permalink)
 
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The 92, 93 6.5 were mechanicaly controlled, so no pmd. From the sounds of it you injection pump needs to be retimed. I've heard of this happening, but never understood why. Since your truck runs fine when in advanced timing/high idle. To time the injection pump you need a special tool.
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