Surging idle after cold soak - Ford Powerstroke Diesel Forum
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Old 02-03-2007, 08:29 AM
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Surging idle after cold soak

Just got my '05 6.0 back from the shop. (Ford dealer) I paid them to install ATS fire rings and head gaskets, ARP head studs, EGR blocker plate, and coolant bypass hoses on the heads. I've got a Banks Big Hoss bundle with the Six Gun, and Speed loader. They also re-flashed the ECM with the latest program that includes the annoying injector cycle after shutdown. The truck runs great, and doesn't loose a drop of coolant. After cooling down all night, and starting it up in the morning, I noticed that the idle is erratic. It starts good, then instead of going to high idle, it idles at slow rpm, then speeds up, and you can hear the turbo whine real good at the tail pipe. Then it will kick down again, and surge, or almost stumble, then will speed up. Could this be air in the fuel system? They did take all the fuel system down to do the mods, and I'm guessing its trapped air. After driving the truck for a few minutes on the road, it runs and idles great. Any ideas??? Maybe a sensor that has something to do with temperature? What do you think Marc?
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Old 02-03-2007, 08:48 AM
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even with the new rogram in the pcm ,curious if you sil have a couple injectors worn causing it to run rough cold that reprogram is not a fix ,its more of preventive damage cure ,but if the damage is already done ,you could still have a injector cold star problem
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Old 02-03-2007, 01:05 PM
Jon
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I agree!

Many times Ive had a truck come in running rough. Did a powerbalance and seen maybe a couple injectors dropping out on cold start up. I replace the bad injectors and reflash it. 2 weeks later it comes back with a couple more out. So i'm guessing you have another injector or two or three. Get her checked out and let us know.
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Old 02-03-2007, 06:02 PM
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When I brought the truck in to the shop to get the puking problem fixed, it ran and idled perfectly. The truck only has 19000 miles on it, and the only trouble with it was it puked under load, or when running my Banks and getting in to it. Do you still think it's injectors? How about entrapped air? I started it this morning, and it surged at idle, but not near as much as it did initially. Do you think it might work its way out if it is air, or is there a technique to bleed it?
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Old 02-04-2007, 05:08 AM
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its not air in the system at this point, if you only have the problem during cold start , i would let somebody run some diagnosis .on it ,im thinking maybe fuel pressure test might be something to check ,see if not building up right off ,also if you ran egr block off plate it could be a software issue that might can be taken care of by calling banks and see if they have seen that concern
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