serious loss of power when engine is warm

braydon · #1 07-29-2010, 09:54 AM

i have a 1986 2.9 v6. what would cause my engine to sound like a lawn mower randomly.. well guess its not random. it does it after i drive about 10+ miles. it does it in any gear after the 10 mile drive. It just sounds like a lawn mower engine, and sounds almost like its backfiring rapidly, then it has absolutly NO power. i mean its ridiculous, fully loaded semi's pass me going up hills!! its really starting to piss me off, im thinking about just junking the dang thing. but if i did that id have to way to get to work.. and i dont have money for a new car either. so any help would be great.

Psychopete · #2 07-29-2010, 01:33 PM

Could be TFI, ECT, O2 sensor, etc.. Good starting point is to pull trouble codes from the computer (particularly CM codes). '86 does not have a functioning check engine light.

braydon · #3 08-03-2010, 09:44 PM

dunno why but changing the oil to a thicker oil stopped the problem. but thanks everyone

hogstar · #4 08-11-2011, 05:42 PM

Braydon. Take a look at my post 1986 missing and bucking--solved???
It might be worn throttle cable links, this causes the throttle plate to wiggle with the engine vacuum and the TPS sends bad signals to the PCM(computer).
It's worth a look and it's free!