CEL while under load - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 23 (permalink) Old 08-11-2009, 02:03 PM Thread Starter
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CEL while under load

I was pulling a 42ft fountain when it first did it, and then a 32ft 5th wheel the second time. But the CEL comes on, but everything runs fine. After a few key cycles it goes off. any ideas?

2014 T800W 600hpISX15 18spd yanking a 2003 XL specialized 110HD with the cheater neck.

93 peterbilt 379ex hood. 3046B 18spd (in time out, broken crankshaft)

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post #2 of 23 (permalink) Old 08-11-2009, 02:05 PM
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does it come on when you are in the throttle hard or pulling grades?

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post #3 of 23 (permalink) Old 08-11-2009, 05:08 PM Thread Starter
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Quote:
Originally Posted by dzljon View Post
does it come on when you are in the throttle hard or pulling grades?
well im usually on the throttle hard while pulling grades..Im not the guy you see in the right lane putting along at 45mph.

2014 T800W 600hpISX15 18spd yanking a 2003 XL specialized 110HD with the cheater neck.

93 peterbilt 379ex hood. 3046B 18spd (in time out, broken crankshaft)

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post #4 of 23 (permalink) Old 08-11-2009, 05:45 PM
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i probally has something to do with rail pressure dropping below limits, when you are asking the engine for lots of fuel, could be signs of a pump not keeping up, PW on the injectors is to wide(I.E. injectors are stayin on to long) your sig does say you have a tuner or chip, if you do tuning could be the cause.

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Last edited by dzljon; 08-11-2009 at 05:49 PM.
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post #5 of 23 (permalink) Old 08-11-2009, 11:09 PM Thread Starter
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no, its bone stock except straight pipe and i hacked up the intake some. no tuner. i was thinking it was a rail pressure issue also since it goes away...just not sure how to fix it

2014 T800W 600hpISX15 18spd yanking a 2003 XL specialized 110HD with the cheater neck.

93 peterbilt 379ex hood. 3046B 18spd (in time out, broken crankshaft)

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post #6 of 23 (permalink) Old 08-11-2009, 11:14 PM
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could be a fuel pressure regulator on the pump going bad or the pump might be getting weak. if your warranty is still good i would take it to the dealer..


sorry i misposted ealier about you having a tuner, i meant that i seen that you do not have anything... sorry

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Last edited by dzljon; 08-11-2009 at 11:16 PM.
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post #7 of 23 (permalink) Old 08-12-2009, 12:01 AM
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When the CEL comes on does the truck downshift automatically or hold a single gear?

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post #8 of 23 (permalink) Old 08-12-2009, 12:15 AM
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Quote:
Originally Posted by merlin5577 View Post
When the CEL comes on does the truck downshift automatically or hold a single gear?
im thinking that as well Rob, are you losing any power when the light comes on? i would get to a code reader asap so you can let us know what actual code is

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post #9 of 23 (permalink) Old 08-12-2009, 02:56 AM Thread Starter
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nope, everything operates normally. just the light is on

2014 T800W 600hpISX15 18spd yanking a 2003 XL specialized 110HD with the cheater neck.

93 peterbilt 379ex hood. 3046B 18spd (in time out, broken crankshaft)

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post #10 of 23 (permalink) Old 08-12-2009, 03:35 AM
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What code are you getting?

-Robert.

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2010 Chevrolet Malibu LT 2.4L 6A
2003 Chevrolet Silverado LS 6.6L 5A
1997 GMC Suburban SLT 5.7L 4A

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