reubenhayden

I have a 90 4-runner 3.0 motor. At light throttle or when accelerating it acts like its bogging down. Once I get to just before quarter throttle it clears out and runs with power. Just replaced cap, rotor, wires, plugs, and checked for vacuum leaks. It also has new air cleaner and ran injecter cleaner through it. Doesn't seem to change. Anyone have any other ideas. Thanks

PowerstrokeJoe

Have you checked your timing? What about your AFM? Both of those can equate to low power.

reubenhayden

Ya the timing is right on haven't checked the afm. What does that intell?

abecedarian

How did you check the timing?
What did you set it to?

INFINITY

unplug the tps and see how it drives

reubenhayden

I checked the timing useing the jumper wire in t1 to e1 port and set it to 10 degrees. Motor running at 800 rpm. I did ohm the air flow meter and it was within spec

TNRabbit

This is one symptom of a bad or mis-adjusted TPS.

It could also be an issue with the distributor or VAFM as well.

Start with the cheap things first. Spec the TPS & try readjusting it.

Have you checked for CEL codes?

4runnedup

X2 on the afm and double check the vacuum

abecedarian

Yep, check the TPS and adjust or replace if necessary.
Check the intake duct for any cracks in the bellows, pcv hoses, etc., and that the door in the VAFM moves smoothly.

reubenhayden

I'll have to download how to check the tps. I have vacuum and all the intake boots look good. I do have another tsp and distributor off an earlier model but ill have to see if I can use them in mine and how to set the tps

reubenhayden

I also failed to mention that the motor kind of stumbles at idle. Just like a little miss. Can also feel it at 40-45 mph. At steady throttle

ghostgxz

Did you ever figure out the problem? My dads 4runner has the exact same problem, minus the miss at idle

mr8a

Keep me posted, same problem. Also put new thermostat and still running too cold, cant ˟˟˟˟ to od

ghostgxz

Look at my last post #21

https://www.yotatech.com/forums/f116...13/index2.html

ghostgxz

Ok more importantly see my next post after that

https://www.yotatech.com/forums/f116...l#post52103138