longbow

My truck is an 89 pickup 22re

It seems like it is a little underpowered so I decided to check my timing. I put the jumper on the port like I was supposed to and noticed no idle change. The light flashes on the dash when I do it. My timing reads off the scale at like 20-25. I tried putting it down to 5 and it lost a ton of power.

I read on here that this may mean that the TPS is not set correctly or bad. So I have been trying to figure out this test procedure at http://www.4crawler.com/4x4/CheapTricks/TPS/index.shtml but some of this is above my head.

Here is the results I got using a multimeter.

VTA and E2 pins start at .80 at idle then increase up to 5.30 at full throttle

IDL and E2 show overload "OL" on my tester at idle and never give any other reading.

Am I correct in thinking that the IDL and E2 should not show overload until I increase throttle a bit? So I am out of adjustment?

scope103

Yes, you need to learn how to use an ohmmeter. http://www.autoshop101.com/forms/h10e.pdf

I'm guessing your 0.80 and 530 is ohms (you set the scale; I don't know what you did). If so, you have a bad TPS as WOT should be 3.1k ohms to 12.3k ohms. http://personal.utulsa.edu/~nathan-b...93throttle.pdf

Your meter doesn't read "overload," instead it's probably showing an "L" or something to indicate the resistance is greater than max-scale. For instance, an open with infinite resistance. You should have "infinite" resistance (though anything over 2.3k is good) when the throttle is "open," and "zero" resistance (less than 2.3k) when "closed." Open and closed are defined with a feeler gauge, but the exact distance is not what's important. Yours is never showing "throttle closed."

longbow

It starts off at .80 and goes up to 5.3 wide open. Sorry I left out the decimal in 5.3.

Meter says OL on IDL and E2

longbow

Video Link

http://s12.photobucket.com/user/long...3e71c.mp4.html