05 Ex 6.0 no power/hesitates @ 65-75 mph, high trans temp???? - Ford Powerstroke Diesel Forum
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Old 05-28-2012, 06:50 PM
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Unhappy 05 Ex 6.0 no power/hesitates @ 65-75 mph, high trans temp????

PLEASE HELP!! Bought a 2005 Excursion Eddie Bauer Edition about two weeks ago and have been having problems since. This is supposed to replace our minivan but we've barely been able to drive it since we got it.

First problem, driving home and it just died on the side of the hi-way. Would crank but not start. We had it towed home and after much reading on this site i was thinking it was the FICM. Turned out to be a bad alternator, installed a new one and charged the batteries and everything is good. Or so I thought.

A couple of days later I was following my wife and i noticed that she had no brake lights. Running lights worked and the turn signals worked but not the brake lights (during this time we also became aware of a hesitation/power issue at about 65-70 mph i'll get to that later). Tested the wiring(which someone in the past made a mess of when they wired it to tow behind a motor home) found that the circuit for the brake lights had an open somewhere, I disconnected some of the aftermarket wiring and reconnected the brake light circuit as it should be and now the brake lights are working At this time we noticed that the backup camera was no longer working. I guess that will have to wait.

The day before the truck stalled and died we filled up the tank and went for a bit of a drive. Approximately 15 miles out of town at around 65-75 mph, trans temp @ approx. 156* the truck seems to lose power and has a hesitation, (no trailer or anything just normal driving). RPM's stay pretty much steady but its slowing down and starting to lurch a bit; almost like it can't figure which gear to go into. Engine temp seems to be fine and the trans was shifting fine up until then. Ever since then it seems to be getting worse. I have changed the engine oil filters, and fuel filters. I hooked up a scan tool but there are no codes. I have talked to mechanics around here but all they seem to be able to tell me is that Ford 6.0's can be problematic. I have also changed my EBP sensor, thought maybe it was sending bad info to the PCM(the values on the scan tool would be fairly close btwn the EBP sensor and the EBP Regulator until the hesitation started, then there would be a huge difference). I know that a warped valve body in the trans can cause some weird issues too, is that a possibility, anyone experience that? Could it be that the trans is running too hot? I've heard that they don't normally run that hot! Not sure what to do anymore, I searched all kinds of different threads but haven't found anyone talking about this problem. Any help you guys can provide would be greatly appreciated.

Also around the time my brake lights went out the Edge Insight monitor stopped working.


Thanks in advance for you help.
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Old 05-29-2012, 09:11 AM
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How hot is the outside air temp, here in Massachusetts when its over 80* and with the humidity my trans temp is usually between 135-150 but i have seen it go up to 160* when i enter the highway WOT for a good 1/4 + mile. I don't think its your transmission, what do you mean by hesitation? Does it smoke white,blue,greyish,black? Does it only do it when its fully warmed up or does it do it when its cold? Do you have any boost problems? Possible ripped boots or cracked, unisom ring in the turbo could be all gunked up and in need of some cleaning, we just need more details to figure out your issue....
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Old 05-29-2012, 10:06 AM
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Originally Posted by x148 View Post
How hot is the outside air temp, here in Massachusetts when its over 80* and with the humidity my trans temp is usually between 135-150 but i have seen it go up to 160* when i enter the highway WOT for a good 1/4 + mile. I don't think its your transmission, what do you mean by hesitation? Does it smoke white,blue,greyish,black? Does it only do it when its fully warmed up or does it do it when its cold? Do you have any boost problems? Possible ripped boots or cracked, unisom ring in the turbo could be all gunked up and in need of some cleaning, we just need more details to figure out your issue....
x148 thanks for the suggestions. Hopefully this info will help.

The outside air temp is about 50 - 60 * right now where we live(central Alberta), so not very hot yet. By hesitation it seems almost like the power is not there or it's slipping out of gear but there is no sudden increase in RPM's which often accompanies slippage. It does "lurch"?? might be a good description and gets real quiet. As soon as i back off the throttle and it slows to about 55 then if i get back on the thhrottle there's all kinds of power. At speeds less than 65 - 75 throttle response is good and power seems ok.

There was also no odd colored smoke. It only does this once it's fully warmed up. Boost, seems to be good, I didn't notice it drop off anyways. As far as i know the turbo was installed in the last six months; so i think it's pretty good. The intake side looks clean at least; I would think that if the turbo was gummed up, it would be more of an issue that would be consistant with RPM rather than speed???

I did check tha hoses, lines ... but could not find any problems.

Thanks again. I'm going to try to contact some other mechanics out here familiar with the 6.0.

2005 Excursion6.0
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Old 05-29-2012, 10:14 AM
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Take the blue rubber boots off the turbo side and at the intercooler and inspect them closely, squeeze them and see if there are cracks. When mine were on my truck they looked fine but when i removed them and squeezed them there were large cracks on the inside. So if im understanding you right your cruising at 65-75mph and out of the blue it will studder? buck? or lurch? for a second and then all of a sudden be fine? I don't think its your transmission, i think its something small that your overlooking. Double check all your fluids to make sure there full. Hopefully this info helps, wish there was a code to help assist you with the problem.
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Old 05-29-2012, 10:43 AM
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Ok 156 is not a hot trans temp. The 6.0 is designed to run in the 150-170 degree range.

Now as to your hesitation what are you using to pull codes.

If your alternator went I guarantee your FICM is bad too.

Test voltage cold and when cranking.


If your CTS died check the OBD II port fuse.
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Old 05-29-2012, 12:45 PM
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Quote:
Originally Posted by x148 View Post
Take the blue rubber boots off the turbo side and at the intercooler and inspect them closely, squeeze them and see if there are cracks. When mine were on my truck they looked fine but when i removed them and squeezed them there were large cracks on the inside. So if im understanding you right your cruising at 65-75mph and out of the blue it will studder? buck? or lurch? for a second and then all of a sudden be fine? I don't think its your transmission, i think its something small that your overlooking. Double check all your fluids to make sure there full. Hopefully this info helps, wish there was a code to help assist you with the problem.
Thanks x148 I'l take a look at the rubber boots. Just to clarify, this happens every time while cruising at 65-75mph, and it doesn't want to go any faster. But only at operating temperature, if the fluid is cool then it doesn't happen.

Thanks.
2005Excursion6.0
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Old 05-29-2012, 05:44 PM
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It died again. Same thing going down the road this time using the scan tool to check out the PCM. Truck starts hesitating, lurching, we start to slow down to turn around and it dies. Cranks but won't start.


Can the FICM cause all this? The alt was charging at about 13.5v when it died. FICM showed 47.92 - 48.84v. When we were sitting on the side of the road for a minute the main voltage was at 11.98-12.20... I just put in a new alt and the batteries seem fine, i'm going to get them tested though. I'm not sure where to go next.
Can it run even with a bad FICM?
Can that also cause the trans to act up?
Does anyone know of a good Ford diesel mechanic in Alberta?

Any help would be greatly appreciated.

2005Excursion6.0
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Old 05-30-2012, 05:58 PM
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I don't think is your transmission, because you should be able to start your engine with a bad transmission without shift it into gears.
Pull out your FICM and Injectors Control Module to get it check at local Ford. Especial if you have a tuner installed.
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