crash2
-Oh no I picked a side-
Sounds like something is not right. Best aproach will be so see the data and see where the fuel trim sits and other data.
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Help Support Hardline Crawlers :
Where is my vacuum going?!
- Thread starter tobyw
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Binder
Well-Known Member
So there is no timing control? Not electronic or mechanical advance?????
Binder
Well-Known Member
True seeing the data is the best bet but I don't think this is fuel trim related. No doubt the trim is off being this is not a custom adjusted chip.
crash2
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I will assume you can program the prom with either being a manual or auto? I would have to guess the prom in it is from a auto and there is no p/n switch input which could be causing an issues since the fuel mapping/iac are different from an auto/manual (particularly at idle is where it would be noticed)
crash2
-Oh no I picked a side-
Well being it has an auto and probably no p/n switch input---that could be an issue....
Binder
Well-Known Member
This may not be THE problem but it sure is A problem. In fact that's full on retarded. You need to have advance capability of your timing. Do you still have the directions and could you post them up maybe with company names blacked out? Odds are they gave you poor directions on initial setup and compound that with the lack of timing conrol what's left is a pile of non running ****.
The prom can be adjusted for auto- manual transmissions but it's not as simple as it sounds......Can you post the numbers and letters printed on the computer? There should be a 7 to 8 digit number and 4 digit letters....
This may not be THE problem but it sure is A problem. In fact that's full on retarded. You need to have advance capability of your timing. Do you still have the directions and could you post them up maybe with company names blacked out? Odds are they gave you poor directions on initial setup and compound that with the lack of timing conrol what's left is a pile of non running ****.
The prom can be adjusted for auto- manual transmissions but it's not as simple as it sounds......Can you post the numbers and letters printed on the computer? There should be a 7 to 8 digit number and 4 digit letters....
I always thought it was a little odd myself, but never gave it much thought because I have NO idea how the whole EFI brain works... Always figured it was smarter than me :redneck:
I won't have access to the rig or the instructions until this weekend, but I'd sure be happy to scan them in and post the pages up as images... I will also try to get a computer number for you...
Binder
Well-Known Member
The P/N switch thing shouldn't be a problem as long as the idle is high enough when it's in gear. They should have compensated for this in the chip before they sent it to you. You won't know the answer to that until you get the surging idle issue worked out......
Have you tried to adjust the idle yourself?
Have you tried to adjust the idle yourself?
No, I haven't... When it idles down, it seems to purr quite nicely. And when it doesn't jump in RPM when you drop it into gear, it also seems spot on? But when it decides to ramp up, it's a PITA!!
Reading back through this, the one thing I forgot to mention is that it doesn't do it nearly as often or as badly in High Range, but it's instant and gross in Low Range.
Reading back through this, the one thing I forgot to mention is that it doesn't do it nearly as often or as badly in High Range, but it's instant and gross in Low Range.
WHITE TRASH1
fruit stripe
Wow Toby it sure sounds like your dad ended up with a sweet setup...
If it was mine I'd either attempt to add in a tbi conversion distributor from D.U.I. or junk that wiring harness completely and put a fomoco junkyard setup on it and be done...
If it was mine I'd either attempt to add in a tbi conversion distributor from D.U.I. or junk that wiring harness completely and put a fomoco junkyard setup on it and be done...
Binder
Well-Known Member
It's good that you didn't try to adjust the idle as it's not user adjustable. This is a common mistake people make. This system has what is called a stall saver which means it will kick up the idle to avoid letting the engine die. It sounds to me like the stall saver is kicking in a bit too much. Could be many different possible reasons for it to do this. If it were mine the first thing I would do is put the distributor back like it was. After that verify the initial setup was done correctly...........
Where's Bill when you need him? I'll try to get him to give his two cents.
Binder
Well-Known Member
This would be a great option but would require adding in wires to the harness and starting over with a different chip. May end up doing that in the end anyways.
If the engine is modded in any way don't try to use a stock Ford setup. It MIGHT work but probably not well and is nearly impossible to custom tune the chip worth a damn.
crash2
-Oh no I picked a side-
stall saver---intersesting. I have never heard that term used before....
Binder
Well-Known Member
It could be called different things but stall saver is what all of the chip editing programs call it.
No mods, just a basic rebuild and balanced.
I'll reread the instructions this weekend and try to figure out where they were going with the distributor, and re-enable at least the mechanical advance. I will also tear the front end off and see wtf is up with the cam to hopefully shed some light on the low vacuum issue...
I'll reread the instructions this weekend and try to figure out where they were going with the distributor, and re-enable at least the mechanical advance. I will also tear the front end off and see wtf is up with the cam to hopefully shed some light on the low vacuum issue...
crash2
-Oh no I picked a side-
Ok--thats where it comes from. I assume its a programable number in refernce to the IAC counts--or something to that nature?
Binder
Well-Known Member
It's a combination of several programable two and three dimensional tables, there are many factors. Yes it basically steps up the IAC counts and in turn the fuel and timing with it. I'm curious if the lack of timing control could be screwing with the stall saver being timing input is missing.
Here is an online article of the exact system we used, done by 4wd & SUV magazine... The page I tagged explains the distributor issue, but you can navigate through the rest of the article just for grins...
http://www.4wdandsportutility.com/tech/03064wd_bronco_tbi_fuel_injection/photo_06.html
http://www.4wdandsportutility.com/tech/03064wd_bronco_tbi_fuel_injection/photo_06.html
