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post #1 of 4 Old 08-11-2007, 10:05 AM Thread Starter
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throwing 2 codes

I hooked up my obd2 and i am throwing 2 codes heres what i searched for and this is what i came up with any help guys? and how serious is this?

P1391 Glow Plug Circuit Low Input Bank No. 1(Right)
P1393 Glow Plug Circuit Low Input Bank No. 2 (Left)

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post #2 of 4 Old 08-11-2007, 10:10 AM
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I would check the glow plug relay and I would check the glowplugs themselves. As well as the wiring harness.

You can check the glowplugs for resistance with a multimeter.


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post #3 of 4 Old 08-11-2007, 09:45 PM Thread Starter
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I dont have a manual like chiltons i need to go pick one up. I ran another test with another obd2 and it was still throwing thoes 2 codes they were p1391 and p1393 where can i find the glow plug relays cause the factory manuls dont help much and its also throwing 2 more codes that the other scan tool didnt pick up they are p0478 which said it was excessive back pressure what could cause this my truck has afeII and turbo back straight piped? and the other one p0476- indicates an exhaust backpressure controll valve performance fault. any help guys? and whats the best manual to get?

00 f-250 lariat cc 4x4
Leveling Kit
Rs 9000's
Straight Piped
Afe stage II
Black Emblims and grill
Clear corners and lamps
Isspro tripple pod guages
Helo 835's on 305/55/20 cooper zeon's
Dptuner 60 80 120 140
jwvb.
6.0 tranny cooler in progress
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post #4 of 4 Old 08-12-2007, 12:33 AM
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the back preasure issue is a sensor located twards the front of the motor easiest way to find it is find a small metal tube running from your exhaust manifold and folow it to the top of the motor to the sensor... if that tube gets plugged with carbon it will throw a back presure sensor out of rang code... the back preasure valve if it is like the OBS trucks will be a valve like an exhaust brake on the turbo outlet that gets stuck closed if you unplug that it will nulify the ebpv and it will be stuck open IF? the superdutys are like the obs trucks im not positive on that one/ hopefully one of the techies will be here to give you some profesional insight good luck



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