5.3 new cam, fires but won't grab idle
04-18-2020, 09:15 PM
#1
5.3 new cam, fires but won't grab idle 5.3 turbo. Last year it was running, this winter i changed the cam to a summit stage 3 and swapped the decapped injectors for deka 80's.
Ive gotten it to fire and stay running 3 times but in between those times it just fires on the key turn pretty solid then just dies. The couple times i got it up and going i was playing with the throttle to make it work, except the first time. The first time it went to 1200 rpm and held by itself. The wide band shows its just stupid amounts of lean down in the idle cells, but I can't seem to raise those cells enough to change what the wide bands says. I increased the cells by 500% and the AF table still shows it wanted 100%+ more. No matter what amount I change it by it wants more. New cam file is the first time it went.
I messed with the idle airflow back and forth but it didnt seem to help anything. Getting the VE table right before I dig into that stuff is proving hard since i cant get it to stay running lol. The cam only has like 2.5* of over lap I can't imagine it require large scale changes from the stock cam tune just to fire it up. But I changed the injectors at the same time...
I do not have access to a tuner here or a dyno. I'm basically on my own for any tuning where I live. I had it running tip top last year until my last 1/4 mile pull of the year and it had stumbling and lean issues right after the pull. I had to feather the brake on it while applying pedal because the AF would go lean with not enough engine load. After checking for vac leaks and the other stuff nothing could be found. Decaps have been known to do such things so i just replaced them with dekas. It got the head gaskets changed too and everything on the top end inspected. Couldn't find anything wrong measurement wise or any broken seals anywhere.
I'm kind of lost on what to do next.
Ive gotten it to fire and stay running 3 times but in between those times it just fires on the key turn pretty solid then just dies. The couple times i got it up and going i was playing with the throttle to make it work, except the first time. The first time it went to 1200 rpm and held by itself. The wide band shows its just stupid amounts of lean down in the idle cells, but I can't seem to raise those cells enough to change what the wide bands says. I increased the cells by 500% and the AF table still shows it wanted 100%+ more. No matter what amount I change it by it wants more. New cam file is the first time it went.
I messed with the idle airflow back and forth but it didnt seem to help anything. Getting the VE table right before I dig into that stuff is proving hard since i cant get it to stay running lol. The cam only has like 2.5* of over lap I can't imagine it require large scale changes from the stock cam tune just to fire it up. But I changed the injectors at the same time...
I do not have access to a tuner here or a dyno. I'm basically on my own for any tuning where I live. I had it running tip top last year until my last 1/4 mile pull of the year and it had stumbling and lean issues right after the pull. I had to feather the brake on it while applying pedal because the AF would go lean with not enough engine load. After checking for vac leaks and the other stuff nothing could be found. Decaps have been known to do such things so i just replaced them with dekas. It got the head gaskets changed too and everything on the top end inspected. Couldn't find anything wrong measurement wise or any broken seals anywhere.
I'm kind of lost on what to do next.
04-19-2020, 04:01 PM
#2
Just a quick look at your file.
The Deka 80 is 89lb/hr at 58 psi fuel pressure. Or are you running 43?
Also, the rest of your injector tables don't seem to be correct for the deka 80's.
Your VE table is a mess.....not trying to be mean.
It seems from your data log etc you are a bit of a novice with HPT?
You aren't logging the correct or enough stuff.
And how is the wideband connected to hpt? EGR port?
Ron
The Deka 80 is 89lb/hr at 58 psi fuel pressure. Or are you running 43?
Also, the rest of your injector tables don't seem to be correct for the deka 80's.
Your VE table is a mess.....not trying to be mean.
It seems from your data log etc you are a bit of a novice with HPT?
You aren't logging the correct or enough stuff.
And how is the wideband connected to hpt? EGR port?
Ron
04-19-2020, 04:42 PM
#3
Just a quick look at your file.
The Deka 80 is 89lb/hr at 58 psi fuel pressure. Or are you running 43?
Also, the rest of your injector tables don't seem to be correct for the deka 80's.
Your VE table is a mess.....not trying to be mean.
It seems from your data log etc you are a bit of a novice with HPT?
You aren't logging the correct or enough stuff.
And how is the wideband connected to hpt? EGR port?
Ron
The Deka 80 is 89lb/hr at 58 psi fuel pressure. Or are you running 43?
Also, the rest of your injector tables don't seem to be correct for the deka 80's.
Your VE table is a mess.....not trying to be mean.
It seems from your data log etc you are a bit of a novice with HPT?
You aren't logging the correct or enough stuff.
And how is the wideband connected to hpt? EGR port?
Ron
I'm a complete novice to it. Last April was the first time I used it. Truck worked well besides some idle hiccups every now and again. Im sure it's no where near as good as an experienced tuner would make it.
I noticed tonight after i got it fired up a few more times that the MAP seems off? When the key is on, engine off, the MAP is reading 30-40kpa and when it was idling it was reading less than 30. Like 0-10. That's not how i remember it before winter.
I just found the sticky with the injector data on it and ya its wrong...well that explains a lot.
Last edited by LetsTurboSomething; 04-19-2020 at 05:54 PM.
04-19-2020, 05:56 PM
#4
Ok, thanks.
ill put a tune together for you that you can use to copy/paste the correct injector data using the compare function into your tune.
I’ll add a VE table too. It won’t be perfect, but will clean yours up.
The map reads weird in hpt.
So here is a test.
Key on, start the scanner. Give the engine a couple cranks. Without starting it. Leave the key on. It should read near 100kpa.
If it reads 30, then I’d say it’s not a 3 bar sensor.
I’ll also post a channel list and layout you can either use or look at to get an idea on what you should be measuring.
ill put a tune together for you that you can use to copy/paste the correct injector data using the compare function into your tune.
I’ll add a VE table too. It won’t be perfect, but will clean yours up.
The map reads weird in hpt.
So here is a test.
Key on, start the scanner. Give the engine a couple cranks. Without starting it. Leave the key on. It should read near 100kpa.
If it reads 30, then I’d say it’s not a 3 bar sensor.
I’ll also post a channel list and layout you can either use or look at to get an idea on what you should be measuring.
04-19-2020, 08:26 PM
#6
Ok, thanks.
ill put a tune together for you that you can use to copy/paste the correct injector data using the compare function into your tune.
I’ll add a VE table too. It won’t be perfect, but will clean yours up.
The map reads weird in hpt.
So here is a test.
Key on, start the scanner. Give the engine a couple cranks. Without starting it. Leave the key on. It should read near 100kpa.
If it reads 30, then I’d say it’s not a 3 bar sensor.
I’ll also post a channel list and layout you can either use or look at to get an idea on what you should be measuring.
ill put a tune together for you that you can use to copy/paste the correct injector data using the compare function into your tune.
I’ll add a VE table too. It won’t be perfect, but will clean yours up.
The map reads weird in hpt.
So here is a test.
Key on, start the scanner. Give the engine a couple cranks. Without starting it. Leave the key on. It should read near 100kpa.
If it reads 30, then I’d say it’s not a 3 bar sensor.
I’ll also post a channel list and layout you can either use or look at to get an idea on what you should be measuring.
and ya I'm referenced off the manifold.