Advanced Tuning questions
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Fleet Mechanic
Joined: Apr 2011
Posts: 1,441
Likes: 6
From: Marseilles IL
Advanced Tuning questions
I know nothing about tuning, im learning, so forgive my stupidity. My truck has 200/30 hybrids. I'm having rich startup/idol issues. I'm working with my tuning company on this. They are closed for the weekend and I have a few questions, and I am always looking for opinions. At idol my injector pulse width at idol is at 1.5 or so. My tuning company says it should be 0.9 to 1.1 . I was told to check all sensors values as I may have a bad sensor. I checked the baro, ebp, map and ait,all seem to be what they should be. My fuel pressure is aprox 70 at idol and 68 on the highway and drops no lower than 55 on heavy throttle. What else could the computer be seeing to command the high injector pulse with at idol. I am on my second chip and I am told something is telling my computer to up the pulse with. I was told to next try another computer. I can post some data logs if it helps but I can't figure out how to do it yet. I am trying to learn and get this 100%. Any help and advice is appreciated.
Thread Starter
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Fleet Mechanic
Joined: Apr 2011
Posts: 1,441
Likes: 6
From: Marseilles IL
ICP is 680-690 at idol and EOT is 194* I can't figure out how to post the data logs.
here is a pic.
here is a pic.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
I know nothing about tuning, im learning, so forgive my stupidity. My truck has 200/30 hybrids. I'm having rich startup/idol issues. I'm working with my tuning company on this. They are closed for the weekend and I have a few questions, and I am always looking for opinions. At idol my injector pulse width at idol is at 1.5 or so. My tuning company says it should be 0.9 to 1.1 . I was told to check all sensors values as I may have a bad sensor. I checked the baro, ebp, map and ait,all seem to be what they should be. My fuel pressure is aprox 70 at idol and 68 on the highway and drops no lower than 55 on heavy throttle. What else could the computer be seeing to command the high injector pulse with at idol. I am on my second chip and I am told something is telling my computer to up the pulse with. I was told to next try another computer. I can post some data logs if it helps but I can't figure out how to do it yet. I am trying to learn and get this 100%. Any help and advice is appreciated.
- Confidence of all injectors down with level seating (no injector knock or low sticks)?
- No air in fuel?
- IPR goes no higher than about 40%-50% at WOT?
- Pulled the ICP connector to test the idle? What does the PW do here?
- All tunes, including Modified Stock?
Thread Starter
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Fleet Mechanic
Joined: Apr 2011
Posts: 1,441
Likes: 6
From: Marseilles IL
Fueling is a combination of the amount of High Oil Pressure to push the fuel out of the injector reservoir (ICP) and the amount of time the injector is open to let the fuel in (pulsewidth). If the pulswidth is too long, that can be an issue with the programming or with a low ICP. If you have a low ICP, there are a lot of possible root causes. Since you've tried a couple of chips (different tuners?) let's focus on what has been done to your truck to prevent low ICP.
- Confidence of all injectors down with level seating (no injector knock or low sticks)?
- No air in fuel?
- IPR goes no higher than about 40%-50% at WOT?
- Pulled the ICP connector to test the idle? What does the PW do here?
- All tunes, including Modified Stock?
Lead Driver
Joined: Jun 2003
Posts: 8,298
Likes: 25
From: Damon (South East Texas)
You may have a sticking IPR. The ICP reading is about 100 psi higher than I see with my singles. The default reading for the ICP is close to what you're seeing now and may not change the PW when unplugged.
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Fleet Mechanic
Joined: Apr 2011
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From: Marseilles IL
I have hybrids and was told they should run aprox 700 at idol for good atomization.
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Thread Starter
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Fleet Mechanic
Joined: Apr 2011
Posts: 1,441
Likes: 6
From: Marseilles IL
I do have a new IPR but new doesn't mean it's working properly. Should I try cleaning it?
Lead Driver
Joined: Jun 2003
Posts: 8,298
Likes: 25
From: Damon (South East Texas)
I would think with your 30% nozzles that you could run a lower ICP and still get good atomization at idle.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
Ah... I see a bit more when I compare yours with my most recent data (version 2 tunes... and likely the last). If you unplug the ICP, the IPR should go to about 15%, which will send the ICP even higher, but the ICP reading will go directly to 700 PSI.
Two completely different tuners?
Two completely different tuners?
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
Thread Starter
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Fleet Mechanic
Joined: Apr 2011
Posts: 1,441
Likes: 6
From: Marseilles IL
I don't have a modified stock. I have Mild Daily(for icy roads), Daily, Hot Daily, High Idol, Heavy Tow, and Drag. I am doing all my testing in the Daily file. All tunes except Drag has the same pulse width at idol. Drag is a bit lower. Both chips are from the same tuning company. The second TS chip is installed now, it is an effort to lower pulse width at idol. Other than the slightly stinky idol and loss in fuel economy my truck runs great, shifts great, and is scary fast, from what I am used to.