MSII 2.886 v2.2 P&H board
I've been battling a minor hot Idle issue for a while. My truck has a 5.7SBC TBI. Overall drivability is good.
Very pleased. The weather has been good here lately and an anoying issue is bugging me lately.
When my Intake air temp raises above 110 degrees I loose Idle quality. Not real bad but it's noticable.
I have a factory ECU that I run sometimes that doesn't do this. Same Harness, just an ECU swap.
So I set out for a day of experimenting. I have played with IAT fuel correction many times and made some improvements but it alway just got a little rough when underhood is extremely hot.
Out of the blue I decided to try Injection delay just to see what it would do and If I would even notice anything.
Oddly enough above a 20% delay there was a noticable improvement in Idle qaulity. Didn't seem to change any after 50% but made an improvement after 20%. I wen't back and forth a couple of times between 0% and 50% just to make sure it did change. I don't seem to have any side affects from doing this. I plan to put some in traffic miles on the truck this week so I'm interested to see if this affects any thing else.
So, it's a wet intake with TBI. Does anyone think it's the actual fuel pulse timing that makes the difference or is it something electrical that's making the improvent. Changing the distance between fuel pulse and ignition.
I have good clean sensor signals, I'm running a crank trigger 4x hall. Good clean signal, good grounds.
So, anyone have any Ideas about injector delay?? Or is my improvement in the same catagory as 'sacrificing a chicken'
Thanks,
Joe
hot Idle issues- Injector delay %
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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devastator
- Experienced Squirter
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- Location: Kinda near Tucson Arizona
Re: hot Idle issues- Injector delay %
Fiddling with the injector delay helped smooth my idle right up too. I don't believe, however, that this has anything to do with problems while running hot. Check your temp values for timing and fuel.
Sandrail-ACVW 2276 cc, Turbo
MS-II W/spark burning E85
The sand must be punished.
MS-II W/spark burning E85
The sand must be punished.
Re: hot Idle issues- Injector delay %
Now that I've had a few days to drive I have to say It improved my overall Idle quality Hot and cold. It was surprising to me.
It now has the OE feel to it that I have always been missing. I am very pleased, I was mainly just chasing the hot issue because my idle quality started to deteriorate. Not real bad just noticable. Very happy overall. Wish I would have tried this a long time ago. Learning new things is always interesting.
Joe
It now has the OE feel to it that I have always been missing. I am very pleased, I was mainly just chasing the hot issue because my idle quality started to deteriorate. Not real bad just noticable. Very happy overall. Wish I would have tried this a long time ago. Learning new things is always interesting.
Joe