7.3l misfiring/surging in only one DP Tuner chip position? - Diesel Forum - TheDieselStop.com
'99 & up Upgrades and Aftermarket - 7.3L Engine Upgrading or adding OEM or aftermarket equipment to your 1999-Up Super Duty or Excursion with 7.3L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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post #1 of 2 (permalink) Old 04-05-2019, 04:59 PM Thread Starter
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7.3l misfiring/surging in only one DP Tuner chip position?

I've had an old school DP tuner 4 position chip installed in my truck for probably 13-14 years with no problems at all. I've never even upgraded any programs since it was original. Lately in only the 60hp position and warmed up the truck will misfire and buck and surge when giving just a little bit of throttle past float going down the highway. It does not do this in any other chip position. It's too late in the week and day to call for tech support so to get me starting troubleshooting in the right direction, Is it possible for a single program to go "bad"? If it was a contact issue with the chip to the ECM would all of the programs be acting up, or is it possible a contact issue would only affect one program?

'02 F350 XLT X-Cab 7.3L/Auto 4x4 Short-Bed SRW
Autometer Boost/EGT/Tranny Gauges
Mods: TTM, Ride-rites, Prepump, Poon'd, Zoodad'd
Sonnax/Tricumilator, 4" Magnaflow 3.5" dp, AIS
DP tuner (stock,60,80-mileage,120)
6.0 Tranny Cooler, EBV Engine brake
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post #2 of 2 (permalink) Old 04-06-2019, 12:17 AM
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7.3l misfiring/surging in only one DP Tuner chip position?

It could be the switch it self acting up in the one position. It could be the connection has what I would call o zone build up or the connection has come loose. It might be a shot to pull the chip out and look at everything and reinstall and test again.

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2000 F250 7.3 4inc exhaust, Ts 6 pos chip witch custom tunes, Built 4R100 w billet triple disc converter, 6.0 trans cooler and deep tans pan, CCV mod, 4 gauge pod A piller,Boost,Trans temp,EGT,fuel pressure AFE intake,RIFFRAFF Frx fuel Rail dead head fix black spring,High Flow banjo bolts,High Flow CVD Fitting, Harpoon mod,Diesel site adrenaline HPOP,AIH Plug,Plenum Reinforcing Inserts. FULL FORCE DIESEL STAGE 1.5 single shot injectors, Garrett powermax GTP38R and blank pedestal, RIFFRAFF Intercooler CAC Boots with complete clamp kit , scanegauge 2
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