Problems, Issues, and Insanity
Thread Starter
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Tuned
Joined: Jun 2004
Posts: 275
Likes: 9
From: San Antonio
Problems, Issues, and Insanity
I got this problem and its driving me crazy!!!!
driving down the road, flat and level, with a slight load on the motor...
I get this "SSSSHHHHHHHHHH" sound and feel a drag on the engine. it comes and goes every few seconds. at first it sounded like it was coming from the passenger side of the engine compartment, but now I'm not so sure....
it reminds me of ... driving a 4 cylinder gasser on a hot summer day with the AC on, when the compressor kicks on, you can hear it and feel the loss of power in the pedal...
thats the best way I can describe it....
I also noticed when pulling a steep hill at about 60 mph, my check engine light flickers when I'm almost to the point of downshifting to pull the hill. I put a code reader on it but its not throwing any codes.
I checked the boots going to the turbo (orange/blue) for cracks or tears but havent found anything on my first glance inspection.
doesnt matter if the heat/defroster is on or off...
clean airfilter....
re-attached line to waste gate... no change...
HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
driving down the road, flat and level, with a slight load on the motor...
I get this "SSSSHHHHHHHHHH" sound and feel a drag on the engine. it comes and goes every few seconds. at first it sounded like it was coming from the passenger side of the engine compartment, but now I'm not so sure....
it reminds me of ... driving a 4 cylinder gasser on a hot summer day with the AC on, when the compressor kicks on, you can hear it and feel the loss of power in the pedal...
thats the best way I can describe it....
I also noticed when pulling a steep hill at about 60 mph, my check engine light flickers when I'm almost to the point of downshifting to pull the hill. I put a code reader on it but its not throwing any codes.
I checked the boots going to the turbo (orange/blue) for cracks or tears but havent found anything on my first glance inspection.
doesnt matter if the heat/defroster is on or off...
clean airfilter....
re-attached line to waste gate... no change...
HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
It's perfectly normal dude. What is happening is the engine is not up to normal operating temperature, so the sensors trigger the actuation of the Exhaust Backpressure Valve on the outlet of the turbo. It restricts about 95% of exhaust flow, which keeps heat in the engine, to warm it up. More throttle will let it disengage and it will actuate again when the conditions are right.
Elder User
Joined: Nov 2005
Posts: 796
Likes: 0
From: North Idaho
What is the outside temp when this happens? Until I Unhooked my EBPV it would come off and on up to 10 miles under light throttle when outside temps were close to 32*. Once engine fully warmed up, it would go away.
Thread Starter
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Tuned
Joined: Jun 2004
Posts: 275
Likes: 9
From: San Antonio
I've had the truck for a number of years and never noticed it before... I plugged it in and since it is only about 40 degrees today it was already pretty warm and it did it all the way to work, which is about 30 miles....
Thread Starter
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Tuned
Joined: Jun 2004
Posts: 275
Likes: 9
From: San Antonio
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Senior User
Joined: Nov 2006
Posts: 176
Likes: 0
It's the valve that you have to disconnect, unplugging the sensor won't help much. The valve is kind of a PITA to get to as it's on the bottom of the turbo where the exhaust downpipe connects. You would also have to wire the butterfly open, or it will just shut on its own.
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Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
Originally Posted by spikebee
You would also have to wire the butterfly open, or it will just shut on its own.
NO you don't. If you unplug the connector on the very front of the turbo charger pedestal, the valve would default to the open position.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,111
From: Rio Rico, AZ.
Probably a bad sensor, making the ECU think that the engine is cold and closing the valve. There's a reason for that SES light to flicker like that.
Unplugging the EBPV is just a band-aid, find and fix the real problem and you'll do better.
Unplugging the EBPV is just a band-aid, find and fix the real problem and you'll do better.
Post Fiend
Joined: Jun 2006
Posts: 5,497
Likes: 7
From: Central, Al
0v - 4.5v is its operating range
If you have a scan tool that can read PID's (AE) it should be within 1.5psi of "Baro" Key On Engine Off.
If you want the pinpoint test for the sensor PM me your email address.
If you have a scan tool that can read PID's (AE) it should be within 1.5psi of "Baro" Key On Engine Off.
If you want the pinpoint test for the sensor PM me your email address.