Check engine light comes on and the turns off when stop and restart it

1992 CHEVROLET 1500
200,000 MILES • 4.3L • V6 • 2WD • AUTOMATIC
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fires right up, step on gas, has nice power, but as i go, the power isn't there anymore and it stays kind of monotone throughout all the gears slowly.. if i step on it it doesn't go faster it just slowly speeds up. and then after 45 MPH if i step down more i can hear clattering like an old truck does when it overheats. but it's not overheating.
if i cruise, it's fine, but when i try to get ahead of traffic i can hear it clicking like the lifters making noise (check engine light comes on). it's only after a certain speed it does this , but i can cruise all day everywhere. the power is just not there. and when i restart engine light is gone.
Jul 10, 2021 at 5:30 PM
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JACOBANDNICKOLAS
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Hi,

What you described sounds like a plugged catalytic converter. Do me a favor. Take a look through this link and let me know if it seems to mirror what you experience:

https://www.2carpros.com/articles/bad-catalytic-converter-symptoms

Also, I need you to check for diagnostic trouble codes. This truck has an OBD1 system and doesn't require a scanner to get codes. All you need is a short jumper wire or even a paper clip will work. Follow the directions in the following link:

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

Do that and let me know what codes are retrieved. Also, let me know if the catalytic converter symptoms seem to mirror what you experience.

Take care,

Joe
Jul 10, 2021 at 10:17 PM