TBI on Toyota I6

[Shannen Durphey]

I think it would be a good idea to find out what is not right during warmup.  Is
the engine too lean?  Too rich?  Too low an idle speed?  Something completely
unrelated?

Do you have a scan tool?  You might look at block learn when warm to give a
rough indication of where the fuel curve is.  Consider what you need to do to
keep the engine running while cold.  Is it just a matter of holding the throttle
open more?  Does black smoke pour out of the tailpipe?  Does it start and die
repeatedly?  Does it pop through the throttle body on acceleration?

Sometimes the smallest changes can make the largest differences.  But you will
probably need to modify the calibration more than once to get an acceptable
idle.

BTW, what are you using for a throttle body?  Which injectors?
Shannen

TomQ wrote:
> 
> All, I have read the Tuning Tips for EFI in the FAQ section and I have a
> couple of questions.  I downloaded the CATS engine tuner and loaded the
> binary of the factory EPROM I am currently using into it. Since my TBI
> system runs, just not during warm up should I just deal with the spark
> and fuel maps? Should I just slowly modify the maps, burn a PROM, try it
> out, repeat as neccesary? I am not looking for the fastest 1/4 mile
> times. Actually I want low end torque which I guess I need to test "by
> the seat". Ultimately I am at the next step, tuning, and just want to
> make sure I go about it correctly. Thanks for the help so far.
> 
> --
> TomQ
> SF,CA
> 
> ----------------------------------------------------------------------------
> To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org