Well it finally died....stock ECM in my 98

lwarrior1016

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You should be able to tune it without any fuel pressure input. It’s not a mandatory sensor, I never ran one with my coyote and it tuned up just fine.
 

ttocs

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I fought with the IAC freq before swapping to a chrysler version I think it was. I was told the holley just does not like the ford IAC's
 
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TTSaleen

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I haven’t done any e85 tuning so, can’t help there. With the iac, I’ve seen them run from 75-300hz. I think it’ll take whatever you give it. If you have idle issues then I’d play with that and see if it clears up any. I know the higher hz will make the valve hum.
Thanks for the advice!
I found some info on the Holley forums last night and did some tinkering.
Swapped in a fresh set of TR8 spark plugs.
Then I drained all the 93 out, poured some E85 in it.
Next I swapped out the defective Holley fuel pressure transducer that was constantly showing 95# with a new replacment and it shows proper fuel pressure now (around 40#).
A few tries to get it to start and it fired up and settled into a nice idle.
It was slightly richer than I targeted, but I suspect it is the cold start fuel add built-in there in the base tune (I haven't changed any of that yet).
It ran really well, and I mean SMOOTH with zero smoke out the exhaust and no extra fuel smell.
Target A/F on E85 at idle is 9.5. As you cand see when cold it is adding more fuel keeping it around 7.9 to 8.5.
I also have the ignition timing set for 30 degrees total with 16 at cranking/startup.

But about the time it got up to 160 degrees, when I suspect the IAC starts to diminish it's influence on the idle, it died.
I could crank it back up and it ran for a second and died again, only running if I tried to feather the throttle.
Not sure if it's the IAC settings I need to manipulate more or something else.
Here's what my gauges were showing as it was coming up to temp right before it started having this issue.
It was definitely going LEAN right before it was cutting off.


Gauges_startup_E85_2L1ESrdke8S2SiT6VNbeYT.jpg
 
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TTSaleen

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Tweaked it last night some, but still have the issue when it comes up to temp.
Got my tuner (Caleb @ Fastlane) looking over the tune file now so hope to have it fixed soon!
Then it will be dyno time for this new engine, on E85, and we are gonna turn it up!
With the manual transmission it should spit out some pretty good numbers, if it don't blow thru the RXT clutch! LOL.

 
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TTSaleen

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ya might want to tune the iac % down a tad but afr looks good
What would you suggest? I have it on 100 right now. I tried 125 and it made the IAC motor hum.
Caleb might change it in the tune once he looks over my file.
 

ttocs

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not the freq, the %. I tried to get my ford IAC to work with a few different freqs and never was able to make it happy with the holley and converted to a chrysler IAC. Then there was no issue.
 
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TTSaleen

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not the freq, the %. I tried to get my ford IAC to work with a few different freqs and never was able to make it happy with the holley and converted to a chrysler IAC. Then there was no issue.
If you don't mind, would you link me to the IAC that you ended up using for yours? If I need to change I would at least try a solution that worked for my fellow SN95 bros! Thanks!
 
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TTSaleen

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Getting the tune dialed in.
Still trying to get the IaC figured out.
it starts OK, but once warmed up it idles around 1100.
Using my laptop I can see it hovering in the 950 range on the dot under idle so something is making it stay up at 1100 range, I suspect either cause I have been leaning the tune out or the IAC.

 

ttocs

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what is your IAC% at now? IIRC you want to get the motor warm, and then get it to where it will idle with the IAC unplugged by adjusting the throttle stop. Once you have that set, Do a TPS autoset and then you should be able to keep the IAC down as low as possible. I think mine is around %14 or so depending on what time of the year it is. I know a good remote tuner if you want to go that rout
 

NXcoupe

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I'm a Holley EFI dealer, factory trained tuner, and installer. If you are running an HP, the ford iac is fine. Terminators need a output file set up for it to work smoothly. I run the ford iac on my coyote race car, my buddy's 306 nitrous termy car, and my other buddy's coyote procharged SN
I'm always willing to help if needed.
 

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