Rough running

[rr]

Try to get more scan tool info. Look at things like O2 voltage, INT
and BLM, whether learn is on or not. Best guess is that you will need
to do tuning.

A possible scenerio is that the choke SA & fuel is allowing the engine
to run ok after startup. As that decays out the engine is leaning out. This
is the sputtering & hesitation. As it further warms up it goes closed loop
and the blm & int compensate for the lean condition. This allows it to
run halfway decent.

Sounds like a nice conversion. You'll like the way it runs once tuned a bit.

BobR.

TomQ wrote:

> 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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