towing problem
Logistics Pro
Joined: Jan 2002
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there are some Non Ford shops that spend the money to have all the same tools as a Dealer OEM Ford shop... the cost is very high for some of this stuff so they are rare...
They have to subscribe to the MotorCraft support service to be able to down load each of the codes...
Truck oriented Ford dealers change and up date codes all the time so they are very easy to work with
The SuperDuty trucks since 1999 have had so many updated for re-flashing to fix various problems and glitches that there are techs out there that have some codes memorized and can re-flashed a PCM and drive test it in under 15 min... around here we pay for 1- $65.00 dollar shop hour for the service because they do not bill partial hours
They have to subscribe to the MotorCraft support service to be able to down load each of the codes...
Truck oriented Ford dealers change and up date codes all the time so they are very easy to work with
The SuperDuty trucks since 1999 have had so many updated for re-flashing to fix various problems and glitches that there are techs out there that have some codes memorized and can re-flashed a PCM and drive test it in under 15 min... around here we pay for 1- $65.00 dollar shop hour for the service because they do not bill partial hours
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
Originally Posted by 900rr
just got my truck back from another dealer they where realy nice but were unable to solve my 7mpg problem or the lack of power that i have written about pryer. they also stated that the pcm could not be programmed to one of the old codes because the pcm can not be overwritten like that that the codes could not just be punched in like that.
Originally Posted by 900rr
and that there were no codes showing on the scanner the tech also said that if the cat convereter was going bad that it would also show a code or the check engine light would come on so still no help.
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Senior User
Joined: Dec 2006
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From: upstate central new york
took the truck out today and ran the truck hard on an open road on the flat from a dead stop i decided to run it wright to the floor on the first pass the truck would only rev to about 4000 rpm and only reached a max of 80mph wrightnto the floor. turned around and started again and the truck had all kinds of power reved over 5-5500rpms and went past 90-95 mph stopped and tried it again and only went 80mph again. went and got my mechanic and it did the same for him but he has no idea were the problem lies he said if he manipulated the thottle it would shift and rev differantley it is still only getting 6mpg. also the muff was replaced about 100-150 miles ago and he and i noticed that from the cat back the muffler and pipes are a blue color like the pipe is getting hot the temp gauge does not move and reads rite on the mark we are going to put it on a computer while driving and see what is going on but both are unsure any help please
Its Comin Right for us!
Joined: Feb 2005
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From: GA
i think its a clogged cat....
stuff inside it may be broken and moving aorund causing different amounts of blockage. That may explain the weird differences in power.
If it was mine i would cut the cat off and take it for a ride and see how it felt(ear plugs of course) or if you have acess to one hook up a pressure gauge in the o2 sensor port
stuff inside it may be broken and moving aorund causing different amounts of blockage. That may explain the weird differences in power.
If it was mine i would cut the cat off and take it for a ride and see how it felt(ear plugs of course) or if you have acess to one hook up a pressure gauge in the o2 sensor port
FTE Leadership Emeritus
Joined: Jul 2002
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From: Long Island USA
Originally Posted by FortyFords
I mentioned this before "fuel pressure underload".Has it been tested ?
If you had a clogged cat you would not get anywhere near 80mph.
Imho
Rich
If you had a clogged cat you would not get anywhere near 80mph.
Imho
Rich
LISTEN TO RICH!!!!
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Senior User
Joined: Dec 2006
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From: upstate central new york
talked to my mechanic a little while ago he put it on a computer while driving and nothing seems out of the ordinary he said as far as the computer readings back pressure was fine at the o2 sensor the fuel pressure checked out fine all readings were rite on the mark he drove 30 miles with the truck but he even said that at points even though reading are rite the truck is having a loss of power but not sure as of this moment so we will wait and see how the truck acts for a while and recheck in a few weeks
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Joined: Jul 2002
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From: Long Island USA
I wonder if crank sensors go erratic (inaccurate) before they fail?
That would explain the ping AND the loss of power. If the computer can't tell where exactly the crankshaft is at any given time, it'd have a hard time keeping the timing correct.
Maybe that's an idea - hook up a timing light and see if the ACTUAL timing is jumping all over as opposed to the computer's?
That would explain the ping AND the loss of power. If the computer can't tell where exactly the crankshaft is at any given time, it'd have a hard time keeping the timing correct.
Maybe that's an idea - hook up a timing light and see if the ACTUAL timing is jumping all over as opposed to the computer's?
Post Fiend
Joined: Jan 2002
Posts: 5,859
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From: USA
Art ,a screwed up knock sensor would do it also .
If his mechanic is on the ball and I give most some rope to hang themselves first before I say otherwise.Since I was in their shoes awhile ago.
His computer hook up to the truck should have picked up on all this.
Did you ask him to do the fuel test underload while driving?
It means very little to test fuel pressure while idling or rev rpms sittling still.
On a dyno yes doing pulls .
We are sure this truck has the gears you say?
Is this a aftermarket muffler?
Then we fall back to the pcm having a bad or doggy computer progranm in it.
I don't recommend this often ,but you might want to try a tunner.
Just to see if it helps in towing .
If your mechanic did a underload fuel test then .
I'm sorry i'm about to give up
Rich
If his mechanic is on the ball and I give most some rope to hang themselves first before I say otherwise.Since I was in their shoes awhile ago.
His computer hook up to the truck should have picked up on all this.
Did you ask him to do the fuel test underload while driving?
It means very little to test fuel pressure while idling or rev rpms sittling still.
On a dyno yes doing pulls .
We are sure this truck has the gears you say?
Is this a aftermarket muffler?
Then we fall back to the pcm having a bad or doggy computer progranm in it.
I don't recommend this often ,but you might want to try a tunner.
Just to see if it helps in towing .
If your mechanic did a underload fuel test then .
I'm sorry i'm about to give up
Rich
Last edited by FortyFords; Jan 19, 2007 at 03:23 PM.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
Originally Posted by FortyFords
SNIP...
If your mechanic did a underload fuel test then .
I'm sorry i'm about to give up
If your mechanic did a underload fuel test then .
I'm sorry i'm about to give up
But you're right about the fuel pressure.
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Senior User
Joined: Dec 2006
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From: upstate central new york
what is the procedure for an under load fuel pressure test. also if i ask for areflsh will it overide the faulty one? and what if they put in the same darn code again the muffler was a brand new ford exhaust from the cat back.
Post Fiend
Joined: Jan 2002
Posts: 5,859
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From: USA
On the fuel rail there is a schrader valve(special fitting) that a mechanic hooks a hose to that has a pressure guage on the other end .
A longer hose is used to position the guage outside of the hood up near the cowl by the windsheild wipers so he can see it from the drivers seat.I had mine riged with a bungy cord to hold it from banging around on customers paint.
Then go for a drive ,find some hills do some pulls up the hills .Watch pressure
I believe the spec is 39psi +- 2 psi.
Rich
A longer hose is used to position the guage outside of the hood up near the cowl by the windsheild wipers so he can see it from the drivers seat.I had mine riged with a bungy cord to hold it from banging around on customers paint.
Then go for a drive ,find some hills do some pulls up the hills .Watch pressure
I believe the spec is 39psi +- 2 psi.
Rich
Logistics Pro
Joined: Jan 2002
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The reason for this test is to see if the fuel BEFORE the regulator is at or above spec...
The in-tank fuel pumps from early MYs can become weak or the fuel pickup screen can be clogged and some times these issues are only present under loads that require MAX volume of fuel
There are quite a few things 900rr is posting that do not make any sense...
the shift in reverse ands steering wheel killing the motor..I think he said was fixed
now we have a new muffler but "blued" after cat exhaust tubing..curious
I am starting to lean toward a clogged or fouled cat but then again the WOT runs with only 4000rpm max until turning the truck around and now getting 5000+rpm suggests a bunch of crap clogging the fuel pickup screen and this should cause a over lean condition where the PCM would detect ping and retard the timing... either way I do not think 6mpg makes any sense unless he is relying on the over head MPG gage and we all know those are not very accurate...
This list of ongoing problems gets more curious by the day...
The in-tank fuel pumps from early MYs can become weak or the fuel pickup screen can be clogged and some times these issues are only present under loads that require MAX volume of fuel
There are quite a few things 900rr is posting that do not make any sense...
the shift in reverse ands steering wheel killing the motor..I think he said was fixed
now we have a new muffler but "blued" after cat exhaust tubing..curious
I am starting to lean toward a clogged or fouled cat but then again the WOT runs with only 4000rpm max until turning the truck around and now getting 5000+rpm suggests a bunch of crap clogging the fuel pickup screen and this should cause a over lean condition where the PCM would detect ping and retard the timing... either way I do not think 6mpg makes any sense unless he is relying on the over head MPG gage and we all know those are not very accurate...
This list of ongoing problems gets more curious by the day...
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Senior User
Joined: Dec 2006
Posts: 166
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From: upstate central new york
this why i am posting here two different dealers have noticed the problems that are stated with loss of power muffler and fuel milage and are both stumped the stalling is fixed the loss of intermittant power is still there the 6-7 mpg are done on paper and not by the overhead that has not worked sense i have bought it and yes the list of problems are getting more curious by the day
Last edited by 900rr; Jan 20, 2007 at 07:31 AM.