Stock truck going into limp mode - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 3 (permalink) Old 03-14-2011, 01:52 PM Thread Starter
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Stock truck going into limp mode

A buddy of mine just bought an 01 duramax with 230,000 miles on it. The truck hasn't had a tuner on it since 100,000 miles. When he bought it the previous owner told us it was going into limp mode and he has to shut the truck off and let it reset before he can drive it again. We got the truck home and changed the fuel filter and the tranny service has 5,000 miles on it. For being stock, the truck smokes. It's got new injectors put in by the previous owner by a dealership. They thought that was the reason for the truck goin into limp mode. I checked the code it's throwing and it's a large fuel leak code. I then ran a scan tool on it to check injector pressures. Under normal driving they are fine but when you get on the truck hard the pressures are only half what they should be. I'm thinking it's the pressure return valve. Anyone have any ideas if that sounds right or if it could be something else?

2000 F-350 cc sb, 4" s.s. turbo back exh with 7" MBRP stack, AFE st II, pop-off valve, turbonetics turbo, ts perf. 6 st chip with Swamp Diesel tunes, d-fuser steriod mod, torque convertor lock switch, quad pod with di procal exh temp, boost and trans temp and stewert warner fuel press gauge, custom made loadable ladder bars and susp stops, 2" leveling kit, 18" Diamo wheels with cepek mud counrty 305/70/18 tires, full billet compitition trans with mag-hiteck pan

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post #2 of 3 (permalink) Old 03-16-2011, 02:03 PM
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The only way to check the rates are in Park and Neutral. Not driving.

+/- 4.0 in Park and +/- 6.0 in Neutral

In Park, if its higher than + 4.0 or lower than - 4.0, they are bad. Same for Neutral but its 6.0.

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post #3 of 3 (permalink) Old 03-17-2011, 05:34 PM Thread Starter
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Thanks. I'll look into it. My buddy is the one who checked it. He used a scanner he got from ATS

2000 F-350 cc sb, 4" s.s. turbo back exh with 7" MBRP stack, AFE st II, pop-off valve, turbonetics turbo, ts perf. 6 st chip with Swamp Diesel tunes, d-fuser steriod mod, torque convertor lock switch, quad pod with di procal exh temp, boost and trans temp and stewert warner fuel press gauge, custom made loadable ladder bars and susp stops, 2" leveling kit, 18" Diamo wheels with cepek mud counrty 305/70/18 tires, full billet compitition trans with mag-hiteck pan
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