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Hey guys, i just recently had to repair my exhaust on my 1991 liberty wagon (the headers on the left hand side had broken off at the join between the other side and the cat). So after a thorough inspection the only remains i found of the cat was 1 tiny piece of honey comb trapped in a steel wool baffle (had a 2 inch muffler and pipe fitted a few years ago and the guys who did it must have shoved this honey comb chunk wrapped in steel wool right on the join of the pipes, and didn't tell me that it was missing!) On finding this i then looked further to find the cat chamber as just an empty shell. Now here's the tricky part, i figured if the car had been running fine without it for 5 years why would it change anything now? all i have done is taken the headers off taken the chunk of honey comb out (but left the steel wool baffle in) and welded the pipe back on. Now there is a tremendous flat spot on acceleration, no matter the gear as soon as the foot touches the pedal to about 2cm down, its as if the car has stalled or dropped right back down to idle or something, but as soon as you press past that point on the accelerator the car is fine. any suggestions guys?

Was the honeycomb before or after the O2 sensor?
Sounds like the engine got used to the way the exhaust was. Could be the O2 sensor not liking the flow it is getting could be a lack of back pressure.

Any codes?

TOONGA

hey mate, i found the problem/problems. o2 censor and pcv valve were fualty and massive air leak in manifold. all fixed and she is running sweet! the 02 censor is before the cat btw

Did you need a new O2 sensor? OUCH!

NachaLuva wrote:Did you need a new O2 sensor? OUCH!

Nah aftermarket O2 sensors shouldn't cost more than $90. It's more a PITA having to shell out for them... I got a Bosch unit for <$90 ages ago with the wiring all ready to go for my model of liberty (that the conversion came from). The other option was a generic unit that you had to put the wires into the correct part of the plug for it to work properly.

Cheers

Bennie

thanks guys