Touchy throttle

[Brent Beeler]

Does anyone else have IDP custom tune Xtreme Street (the one that is safe for stock head bolts?) I noticed when my truck is cold (before operating temperature is reached) the throttle is very inconsistently touching, you barely touch the throttle and it takes off fast then at the next stop sign it might take off normal. However once it reaches operating temperature it is fine. Just thought it was a little weird.


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[g2shuck]

sounds like your having either injector or ficm problems

[Brent Beeler]

FICM voltage always at 48v. And it only does it running that tune don't think it is hurting anything I just thought it was a little weird


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[DoubleDpsd]

I noticed the exact same thing with id tunes. Must be normal. Once warm was consistent.

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[onebadcoastie]

Mine is similar to that but I noticed it with both tunes from different writers and on stock settings. Troubleshooting has led us to the injectors and I'm taking it in Monday for a power balance check to find out which of the injectors are operating properly. Mine also shakes vigorously while cold and sounds rough as well.

[Brent Beeler]

If you do an injector buzz test before you start the truck in the morning you will be able to tell which injectors are going south what is your FICM voltage?


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[onebadcoastie]

My FICM volts are 48-49.5 I don't have the means to do a buzz test at home. Talking to one really well known diesel tech, he suggested the power balance but yes, the buzz test will work as well.

[Brent Beeler]

Well good luck, let us know what you find out. Does it rattle and shake when you first start it on a cold morning and smooth out when it warms up?


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[onebadcoastie]

Originally Posted by Brent Beeler

Well good luck, let us know what you find out. Does it rattle and shake when you first start it on a cold morning and smooth out when it warms up?

Yes, but here's the catch:

It used to always shake and rattle and sound like the engine was going to come out from under the hood...if I didn't plug the truck in at night. Now, it does it whether I plug it in or not. Usually takes about 3-4 minutes to subside. If I shut the truck off and start it back up, it doesn't do it. We've trouble shot the HPOP system using IPR numbers from my data log on my dash boss, FICM volts are definitely good, guess we'll see. I'll def keep ya'll posted. What I'll do tomorrow morning is take video of it and post it.

[Brent Beeler]

Plugging it in probably kept the oil warm, injectors won't be quite as sticky with warm oil. But now sounds like you lost a few injectors completely. Look forward to hearing what you find out tomorrow. again good luck.


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