Rough running

[Kris Weldy]

Just curious if you have hooked up an ambient air sensor or a manifold air
temperature sensure in a different spot.I had a similiar problem with my
volvo when i ran the haltech on it,the ambient air temp sensor registered
108degrees f because it was getting heat soaked by the exhaust,thus the
haltech pulled too much fuel out of the fuel maps and after a couple of
minutes power was horrible.Haltech claims that if you put the ambient air
temp sensor downstream of the turbo-it may blow my motor due to the
compressed and high temp air from the turbo(i have the old f7c which you
canot change the ambient air temp maps),so its reccomended to mount into a
place where heat soak is minimal.Hope this helps.--
Kris Weldy (AIM: VolvoFam3)
Arlington, TX
'87 760ti, 15psi w/B23FT, TO3/04E turbo, many mods




> Howdy all, I am having problems with my FI install on my Toyota I6 motor
> and was looking for some advice on how to tackle the problem.
>
> Background:
> I have placed the Chevy TBI from a V6 Astrovan (4.3L) on to the I6 motor
> in my Landcruiser (4.2L). My distributor is a DUI HEI unit that has the
> Chevy ignition module in it but the body of it has been modified to fit
> in the Toyota block (basically it looks like a Chevy unit to the
> Computer). I have the timing adjusted to TDC (did it while disconnecting
> the one wire the manual told me to disconnect). One wire O2 sensor.
> Stock ESC. No knock sensor. No EGR. VSS sensor adapted to manual tranny.
> All other sensors are installed.
>
> Problem:
> When I initially start up the vehicle put it in gear and drive it down
> the road it works great. Nice power, no hesitation, but idles around 1k.
>
> After about 2 or 3 blocks it starts to run horribly. Lots of hesitation,
> sputtering, especially between 1k-2.5k. If I rev it out to 3-3.5k it
> seems to help. It also will stall when I stop. Oddly enough after it
> stalls and I start it up again it runs fine for a block or two but then
> starts to run rough again.
>
> After around 10-20 minutes or I am guessing when the Coolant (sensor is
> in the head and fluid level is topped off) is fully warmed up it runs
> well. No stalling, no hesitation, there does seem to be a little
> flatness or lack of power in the 1k-2k range, though.
>
> Newbe guess:
> I used a scan tool and hooked it up to the ALDL and it did not give any
> error codes. Would a heated O2 sensor help? Do I need to reprogram the
> 747 prom? The motor sizes are pretty close so I though I wouldn't have
> to reprogram. What kind of information should I try to get to help
> figure out what is causing the problem or what is not causing the
> problem?
>
> Thanks for the help..
>
> -TomQ
> SF,CA
>
>
>
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