Towing Slowly Up Hills - Page 2 - Diesel Forum

jasonlisan · 06-29-2009, 11:11 AM

hypoxia - I think I might be having the sames issue, just got back from camping & and I was pulling 17,000lbs and anything under 45mph, my boost would only reach 20psi. Over 45mph, my boost would be over 30psi. Maybe this normal but feedback would be appreciated.

What turbo did they replace??

LandShark-47 · 07-02-2009, 09:30 AM

You have some sort of issue that's for sure. I just climbed a 9% grade at 35-38 psi towing 15.5k.

jasonlisan · 07-02-2009, 10:55 PM

That's what I'm thinking, my 2006 F-250 6.0 had more turbo boost for sure.

hypoxia · 07-25-2009, 09:26 AM

The high pressure turbo was replaced BUT it didn't fix the problem. I was down to 40 MPH on a hill, 2600 RPM 25 pounds of boost. Sometimes it will shift down to 2800 RPM but the boost drops to 20 Pounds and there is no acceleration it just makes more noise. MPG went down to 5.8 on the lie-o-meter.

On lesser hills it will drop to 45 MPH or so with slightly higher RPM's but the boost stays about the same.

Back to the shop it goes.

hypoxia · 07-25-2009, 09:28 AM

Quote:

Originally Posted by LandShark-47

You have some sort of issue that's for sure. I just climbed a 9% grade at 35-38 psi towing 15.5k.

That's good to know. I've never seen those pressures at any time.

BeatMarti · 08-01-2009, 05:25 PM

I am having the same problem - however, sometimes, especially in the morning after only a few miles of travel, I hit a 10% grade for several miles and sometimes I get 32+ boost and excellent power. Possibly the same day after driving a while, I experience what you do: Around 20+ boost shifting down, wimpy power. Go figure! I have about 42K miles on it now. When it was newer (20K miles or so) I never had these kinds of issues. What is happening?
I suppose the low boost/power is really just a symptom of some other problem maybe a bad sensor or whatever. I wish I knew where to start without spending lost of money and time with the Ford dealer. I guess it would be nice to have a good scanner. My Edge device is great for displaying the essential, but I need to see more.

jasonlisan · 08-07-2009, 12:45 PM

Well mine's been in the shop all week, so far the only thing I've heard is that it's possibly a programing issue. Hopefully I'll find out more today.

jasonlisan · 08-07-2009, 12:53 PM

Well just got off the phone with Ford, they reprogrammed the PCM to put out higher boost, time will see, not keeping my fingers crossed though. I also had them look at a small leak, they thinks it's the bed plate, put some die in so we'll see on that too.

senix · 08-07-2009, 09:48 PM

programming is most likely the cause of the low boost. Happened to me after I got mine reflashed in Oct of last year.

I could tell it was not right and had another dealer re-flash it.

BeatMarti · 08-14-2009, 02:57 PM

Quote:

Originally Posted by senix

programming is most likely the cause of the low boost. Happened to me after I got mine reflashed in Oct of last year.

I could tell it was not right and had another dealer re-flash it.

What did you tell the dealer to get him to re-flash? What did the dealer do different this time in order to increase the pressure again?

senix · 08-14-2009, 03:03 PM

Quote:

Originally Posted by BeatMarti

What did you tell the dealer to get him to re-flash? What did the dealer do different this time in order to increase the pressure again?

they did not put the correct and latest flash on it. I knew because I was not getting the "cleaning exhuast filter" message.

Other than that it would only be by there willingness to re-flash it I suppose.

hypoxia · 08-16-2009, 08:55 AM

New EGR and MAP sensors brought the boost up to 32 PSI sometimes but it still slows down to 40 on long climbs. New fuel filters no help.

Seems like a computer programming problem as it climbs at low RPM and boost. One hill it slowed to just under 60 at 2200 RPM, pedal to the floor & it didn't shift down. Other long hills it slows to 40 and may or may not shift down but rarely ever goes above 2800 RPM & boost is normally around 25. Just doesn't even try.

I've had a data recorder on it for several trips now & the engineers haven't figured it out.

Fanuc · 08-16-2009, 09:43 AM

hypoxia

can I ask what dealer your working with?

hypoxia · 08-16-2009, 12:15 PM

Earnhardt Chandler. So far I have been happy with them. The mechanic has been communicating with me & is very knowledgeable. He sends the data recorder info to Ford & they give him direction.

Biggest problem; can't duplicate it without going 50 miles to a long hill towards Payson while towing a load, around 22,000 GCW. They always supply a car but I have to move everything back & forth.

crashguy · 08-27-2009, 12:36 PM

Welcome to the world of the high EGR temp defuel.

It's a known problem. The computer purposely defuels when EGTs rise in the EGR system. There is nothing wrong with your truck, and there was likely nothing wrong with your recently replaced high pressure turbo either.

Lemme guess, you were towing uphill in hot weather and the beginning of the hill was fine? Then the power drops off?