Normal Boost Pressure #'s needed / Coolant leak - Ford Powerstroke Diesel Forum
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Old 01-28-2012, 11:26 AM

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Normal Boost Pressure #'s needed / Coolant leak

Long time lurker not too many posts for me here... Lots of great info here, thanks for that! I've got an 08 F250 6.4 with 57k miles. Its been great until now. It is stock but I do have a dashdaq to monitor engine parameters.

It's been in and out of the shop **5** times over the last three months for a coolant leak. I've already done the radiator so it is not that. They've replaced the degas bottle, degas bottle cap, upper and lower radiator hoses, and most recently both thermostats. They said that it is "positively" fixed this time.

I haven't gotten it to puke as of yet but I do not think that I have driven it hard enough yet. It would *only* puke when driven hard or under a load (we used to tow an 11,000lb boat) Needless to say I am not convinced that it is fixed. Time will tell.

A couple issues after this most recent repair .......

The heat will go from hot to cold while the EOT and ECT are at their normal warm ranges ~190. My mind goes to thermostats opening and closing when they shouldn't be... thoughts?/

Also, I am seeing boost pressures at 15-20 lbs while unloaded, on a flat highway at 65-75 mph with the cruise control set. Also, fuel rail pressures are at 12000-14000, EGT's are normal (not indicating a regen status) Regen is not indicated on the dash info meter, fuel economy sucks!

Can anyone comment on normal boost pressures at a constant highway (flat) speed, unloaded (not towing / hauling) no headwind???

Sorry for the novel, Thanks!!!!
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Old 01-29-2012, 06:37 AM
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That is way too much boost for unloaded flat cruising. It is possible it's overboosting and that leads me to my next idea.

I've never seen a 6.4 puke but that (and the heat cycling) makes me suspicious of the headgaskets honestly, while headgasket failures are rare they have occured. For some reason egr cooler failures don't seem to pressurize the degas bottle like 6.0s do.
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Old 02-20-2012, 12:31 PM

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Still having the issues.. and Ford is just throwingf parts at it.. No heat on highway (70-75mph) and its puking a little in cold weather (below 30F)

Just about the only thing the dealer HAS NOT done is the head gaskets.

anyone else??
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