Budd Cochran wrote:
> One difficulty Jeep owners have with the Renix Fuel Injection is
> setting the TPS correctly.
>
> I found myself needing to set my son's 88 XJ's TPS without a vehicle
> battery.
>
> The method I used was to take the throttle body off the engine and
> suppling voltage from a couple "D" cells, then set the output voltage
> to 17 % of the battery voltage checking the pins as described in my
> Chiltons or Haynes manual with a DVOM. Then I re-installed the
> throttle body on the engine.This was two weeks ago, btw.
>
> We put a battery in the XJ yesterday and cranked her up.
>
> Idle quickly settled in to a sweet 700 rpm initially and after the
> computer finished it's initial learn cycle it dropped to 650 rpm.
>
> I have found setting the percentage of the output voltage to be far
> more accurate and easier than using the recommended voltage in the
> manual.
> And being able to adjust it off engine makes it even better.

Yep, good tip!

The 93ZJ only has two bolts, no real adjustment.
I did find that minor adjustment of the throttle-body
stop screw did move the idle air motor to a different position.
That helps in smoothing things out.
It's just 1/8 of a turn though. Very twitchy.