Popped her in the shop today...uh-oh.... - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 01-16-2012, 11:03 PM Thread Starter
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Popped her in the shop today...uh-oh....

So with the truck running a little funny I took it to the shop and got them to do a cylinder contribution test and cylinder 8 had a code... While it was in there the tech reflashed the PCM, now he reflashed it to 99 programming (just cause mines a 99) but the po put in a computer from a 01 dOes that defea the whole purpose of having a 01 PCM? Also it had a code for a intake heater issue but im pretty sure e99 didn't have an intake heater....

Next step is to obviously check #8 injectOr... What's the best way pull the valve cover off and look for the oil squirting?

E99 F250 7.3 - intake, strait pipe 35" mud terrains 6.5 procomp lift ...that's all....for now
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post #2 of 5 Old 01-17-2012, 11:06 AM
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Very much doubt your #8 is bad. the new gray CPS cause scanners to trigger on cyl 8 yet they are well within their working parameters. Check change in rotational velocity of #8 (and #3). Youre fine if its below 10%.

I would think the PCM needs the appropriate firmware for the PCM code and not the year of the vehicle. Then again, a compatible PCM should have been installed in the first place. putting an 01 PCM in a 99 could cause lots of compatibility issues, then again, it could be a perfect match. too many variables and uncertainties.

Nonconformist. Functionality over bling.

My three rules for 7.3l troubleshooting: 1) Replace CPS and keep a spare. 2) Replace FPR and know your fuel pressure. 3) Hook it to a scanner and check for codes.
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post #3 of 5 Old 01-17-2012, 01:05 PM Thread Starter
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I took it in because of a low engine speed shutter

E99 F250 7.3 - intake, strait pipe 35" mud terrains 6.5 procomp lift ...that's all....for now
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post #4 of 5 Old 01-17-2012, 01:26 PM
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That could be old oil, bad gas, time for a filter change. Lots of little things could cause that. Is it a big deal or just something that only you notices because you know the vehicle so well?

You could have a bad #8 cyl, but i dont think you do and until the problem gets so bad it causes other codes, i wouldnt worry about it.

One thing i would do though is add a fuel pressure gauge. Fuel pressure is not monitored and its very important

Nonconformist. Functionality over bling.

My three rules for 7.3l troubleshooting: 1) Replace CPS and keep a spare. 2) Replace FPR and know your fuel pressure. 3) Hook it to a scanner and check for codes.
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post #5 of 5 Old 01-17-2012, 08:49 PM Thread Starter
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Low rpm shutter under load back off throttle goes away..the tech mentioned the cps may be throwing the code and make it run ****ty

E99 F250 7.3 - intake, strait pipe 35" mud terrains 6.5 procomp lift ...that's all....for now
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