1994 6.5 sluggish cold, warm fine??? [Archive]

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Jamie Kennedy

11-09-2006, 19:32

I have a customer that has a cold start issue, the engine starts fine and runs fine however when driving for the first few miles it is sluggish and almost not responsive and then all of a sudden it gets a boost of fuel????and is fine from that point. Apparently, the problem is present now for months. New pump, injectors and ECM. No codes.

Warren96

11-10-2006, 17:31

No codes? Could be a fuel delivery issue.Change the fuel filter, and check that the lift pump is working. Bleed the new filter till you see a clear stream of fuel.I hope it's as simple as this.... keep us posted!

Mark Rinker

11-10-2006, 19:33

Check turbo for free spinning at cold temps. Could be going out.

JohnC

11-13-2006, 12:25

I'd check all the temperature sensors for correct action.

gmctd

11-13-2006, 14:50

I'd start with the fuel supply - lift pump and associated circuitry, as suggested

Jamie Kennedy

11-13-2006, 19:16

thnx for the info., all basic checks been done on this baby; however the turbo is the only thing that hasn't been changed or checked!!!! I also found out that the original customer said that the vehicle had the concern for a long time and very consistant with the early start-up problem. I will keep you posted when a cure is found. cheers, Jamie.