Compression Ignition Addict
Join Date: Sep 2012
Location: Hamilton, OH
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2003 7.3 SES on start then lopes after
I just picked up a 2003 7.3 6 speed 170K. I bought the truck under the assumption that the turbo was blown based on the dealers assessment. The good news is that it was wrong and the turbo appears to be in great shape. No play and spins nice.
When started cold the SES light comes on at start up and stays on until the truck is warmed up a bit. During this time, the engine idles smooth but is very sluggish to rev and stumbles at 2k rpm and if pushed beyond that just blows white smoke really heavy. After a while the light goes out and the truck does a few bad bucks and sort of smooths out but still has a lope especially when letting off of the pedal. it drives ok but has some hesitation.
After it is warm if I shut it down and restart it, the SES light comes on initially with all the same symptoms as well as not wanting to build any boost. after 30 seconds or a minute the light will go out it will lope real bad then mostly calm down.
I have recently been using the torque app. At idle the HPOP is right at 500 psi maybe a little shy. The IPR duty is around 15% when pushed hard, the HPOP gets up to about 2600.
I have tried checking for codes with torque and it turns up nothing.
My thought is that for some reason at start up its in some sort of limp mode then kicks out of it but actually runs worse. What would be changing or what would the computer be monitoring that would result in those symptoms after it comes out of limp mode?
Any ideas or suggestions are greatly appreciated. I just changed the oil because it looked a little dirty. Also changed the coolant. It looks as though it may have previously had oil in the degas bottle at some point.