need help diagnosing problem....
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From: orygun
need help diagnosing problem....
howdy all,
here are the symptoms: while driving down the road i hear a 'surge' type sound coming from around the turbo and out the exhaust. a loss of power accompanies this sound. it happens in all gears when the motor is cold or hot. it only happens when i'm cruising with constant foot pedal pressure. as soon as i let off the throttle it goes away. and if i get on the throttle it goes away.
looking for help diagnosing this problem. so far i've come up with....turbo surge (replace compressor wheel), exhaust back pressure valve/exhaust back pressure valve sensor malfunction, and keeping my fingers crossed it's not an injector or a one of the wiring harnesses taking a crap on me.
i've taken the truck to a ford dealership and they told me the motor had a miss. i immediately left said dealership. the truck has no shake or shudder that i would assume a miss would cause. and i would assume their puters would be able to tell if the motor has a miss right? anyway....
looking for input and opinions....
thx in advance!!!!
here are the symptoms: while driving down the road i hear a 'surge' type sound coming from around the turbo and out the exhaust. a loss of power accompanies this sound. it happens in all gears when the motor is cold or hot. it only happens when i'm cruising with constant foot pedal pressure. as soon as i let off the throttle it goes away. and if i get on the throttle it goes away.
looking for help diagnosing this problem. so far i've come up with....turbo surge (replace compressor wheel), exhaust back pressure valve/exhaust back pressure valve sensor malfunction, and keeping my fingers crossed it's not an injector or a one of the wiring harnesses taking a crap on me.
i've taken the truck to a ford dealership and they told me the motor had a miss. i immediately left said dealership. the truck has no shake or shudder that i would assume a miss would cause. and i would assume their puters would be able to tell if the motor has a miss right? anyway....
looking for input and opinions....
thx in advance!!!!
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Joined: Feb 2007
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From: new west b.c
well yeah with the dealers the tech has to recreate the issue to really understand what the customers talking about and i know as i work at a dealer that most eec techs won't, so all they will do is plug it into ids and see what codes they can pull out, i would go back to that dealer and give them specific instructions on what u want tested , keep in mind u would have to pay for the testing and all that
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From: orygun
well yeah with the dealers the tech has to recreate the issue to really understand what the customers talking about and i know as i work at a dealer that most eec techs won't, so all they will do is plug it into ids and see what codes they can pull out, i would go back to that dealer and give them specific instructions on what u want tested , keep in mind u would have to pay for the testing and all that
i was real clear with them about what the problem was and even went for a drive with the service manager. what else could i have done?
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From: orygun
also....would i be correct in assuming that if the problem was electrical...like a sensor or something, a code would come up? should my check engine light be on in the cab? and if the problem was mechanical....like the back pressure valve sticking or not working right...no code would come up? not sure how or what puters can tell the techs...
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From: new west b.c
also....would i be correct in assuming that if the problem was electrical...like a sensor or something, a code would come up? should my check engine light be on in the cab? and if the problem was mechanical....like the back pressure valve sticking or not working right...no code would come up? not sure how or what puters can tell the techs...
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From: orygun
i was shown no code printouts or anything. the only thing they did to convice me i had a miss was to rev the motor up to 3k rpms 3 times in a row. on the last cycle when it settled back to idle the truck 'shook' slightly...and i mean slightly! would that constitute a miss?
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From: orygun
i don't know if they hooked it up or not. i just naturally assumed they would do that. i left in a hurry after seeing the preliminary estimates of costs for the work they were planning on doing....including replacing a perfectly fine parking brake foot pedal assembly install for 400 bucks....
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From: new west b.c
i don't know if they hooked it up or not. i just naturally assumed they would do that. i left in a hurry after seeing the preliminary estimates of costs for the work they were planning on doing....including replacing a perfectly fine parking brake foot pedal assembly install for 400 bucks....
i think that assembly can't be much more then $100 and maybe 1hr labour
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From: orygun
but, that was their basis for the "miss". i was not offered or shown any printouts regarding tests run via computers....
i don't have a constant loss of power. if i get on the throttle, it still tears up the road. only have the power loss/hesitation while cruisiing with a constant and consistant foot pedal pressure.
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Joined: Oct 2007
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From: Farmington, Minnesota
How long have you owned to truck?
I see you have a sig are 35's your only mod?
Quote] here are the symptoms: while driving down the road i hear a 'surge' type sound coming from around the turbo and out the exhaust. a loss of power accompanies this sound. it happens in all gears when the motor is cold or hot. it only happens when i'm cruising with constant foot pedal pressure. as soon as i let off the throttle it goes away. and if i get on the throttle it goes away.
It sounds like the EBV is closed under light throttle and opens when you push on the throttle and the increase in exhaust opens the valve. As far as letting off the throttle, the sound goes away because there is no exhaust being forced by the valve (but it's still closed) This is normal operation in temps below 40*. If its warmer than that when this is occurring then the EBV is malfunctioning
I see you have a sig are 35's your only mod?
Quote] here are the symptoms: while driving down the road i hear a 'surge' type sound coming from around the turbo and out the exhaust. a loss of power accompanies this sound. it happens in all gears when the motor is cold or hot. it only happens when i'm cruising with constant foot pedal pressure. as soon as i let off the throttle it goes away. and if i get on the throttle it goes away.
It sounds like the EBV is closed under light throttle and opens when you push on the throttle and the increase in exhaust opens the valve. As far as letting off the throttle, the sound goes away because there is no exhaust being forced by the valve (but it's still closed) This is normal operation in temps below 40*. If its warmer than that when this is occurring then the EBV is malfunctioning
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From: new west b.c
yeah i think there just trying to sucker you in so they can get your truck in there shop and start tearing it apart and racking up your bill and then go oh yeah you nead a exhaust back pressure valve sensor
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From: orygun
yup...part was 95 i believe....rest was labor....including adjusting the brakes in the rear. which i did in 15 minutes myself.