fresch

My truck started missing every so often and the problem started to get worse until the check engine light came on. The codes read 13, 14 and 21. I have had a bad ground on the ignitor before so I cleaned off the connection to the body and reset the codes. This did not stop the problem and the light came on again with a 13 (ignition). I changed the plugs, wires (NGK) and rotor and dist. cap. The problem persists. I exchanged the distributer body with another working one and the missing is still happening. Does anyone have any suggestions to the source of this problem on a 1991 PU 22re? I am thinking it may be a ground problem somewhere. The problems happens when I have tourque on the engine. But it starts and idles fine.

myyota

I think code 13 is no signal to ecm after 1500 rpm, code 21 is 02 sensor, and i think code 14 it TPS, im going from memory but i think that`s right. I would check the TPS, some times when they go bad they can cause more than one code, they can cause your truck to run bad, and ive even seen a bad TPS keep the engine from starting.

fresch

Thanks, I will look into testing the Throttle Position Sensor.

I know it is an electric module on the throttle body. But not much else. Any test suggestions would be appreciated.

myyota

Check out 4crawlers web site, he has a page that shows you how to adjust the TPS.
www.4crawler.com

fresch

Not sure if it is the TPS. Why? Because the miss is not necessarily at the same throttle position. I cleaned out the throttle body with Carb cleaner and I have not had the miss happen yet. This is a hard problem to solve because it is intermittent and does not happen every time I drive it. I am going to spray it out once again because it was pretty guncked up.