Join Date: Apr 2008
Location: Beeville, TX
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By 'muffler delete', do you mean the muffler, or the Diesel Particulate Filter? There is really no sense in deleting the muffler, since it is a strait-through design. No restriction there at all. If you have deleted the DPF, then that is the reason why you are in high idle. The computer freaks out when the particulate filter is missing. That is, unless you have tuning that will disable that part. What the high idle is is the computer trying to 'Regenerate' a dirty particulate filter. If there is a problem with the filter (not being present is a big problem), it will regenerate continuously.
I would guess that who ever owned it before you was running an intake system, a DPF delete, and some sort of tuner. They took the tuner off when they sold it, and left you with a partially functioning truck.
You really need to either get a DPF installed in the truck, or install a tuner that disables the regen process (the preferred method to fix this problem). There are a couple of different tuners that would do a fanatastic job. There is one company called Spartan Diesel Technology that makes just about the best tuning money can buy. SCT is also a good choice.
Do a search for "DPF Delete" and Spartan, SCT, etc. There is a wealth of information here.
Eli Benson - EMT, Ambulance Mechanic
'08 F350 Dually KR - Spartan'd
'07 F250 CC SB 4x4 XLT - SCT /w Innovative Tunes
4 '09 & '10 E350 6.0l ambulances
1 '08 Duramax 6.6 (LMM) van ambulance