97 F250 HD misfire under load - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 2 (permalink) Old 08-16-2017, 09:01 PM Thread Starter
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97 F250 HD misfire under load

Hi I have a 97 f250 hd with 243k. It seems to misfire while driving. It runs pretty good around 1200 rpm pulling but past that it seems to drag a cylinder. I am getting almost 20mpg mixed driving. The truck is not using any oil besides the seal in the rear of head. It doesn't seem to smoke at all when misfiring. I tried the buzz test with my scanner but testing was inconclusive because it doesn't seem to misfire unless under load. How can I go about diagnosing this?
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post #2 of 2 (permalink) Old 08-17-2017, 02:01 PM
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Location: Idaho panhandle
Posts: 3,354
Re: 97 F250 HD misfire under load

lookup "superduty diagnosis on the cheap" you need a scanner/app that can watch/listen/record what is happening inside your 7.3 when driving.
I paid $50 for an Android 7" tablet, $15 for the app and $20 for the OBDII cable so I can do this also
Will make it much easier to find your "miss"

Problematic / Weak spots on stock 7.3:
stock turbo pedestal / EBPV issues
UVCH valve cover/injector / glow plug wiring harness

1997 CCFB 7.3, ZF5, 4x4, 4.10, baby swamps, TS6, E99 spyder, RiffRaff pipes, 6.0 FMIC, RSK, 315 toyo at
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2001 Excursion 7.3, auto, 4x4, 3.73, 6" Suspension lift, 37" Dick Cepeks
2000 E350 7.3, auto 2wd, 3.73, planning a TTB 4x4 conversion
21.9 liter family
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