check engine light - new flowmaster

[pd4surfing]

I recently upgraded to a Flowmaster 40 and 2.25 exhaust, we also removed the cat. Sounds great, and much improved flow and power, but my check engine light has come on a few times...usually when driving along in 4th or 5th at lower rpm. 1500-2200. Then when I gear down, and rev her up to 3000 - 3500 rpm shifting between 1st 2nd 3rd, the light will go out. Haven't checked the codes yet, but wondering if anyone had any ideas? Or if anyone had the same situation after uprading their exhaust? Maybe O2 sensor? Any help would be great!

 

Thanks,

Richard,

Kamloops, BC, Canada

1995 pathy

[88pathoffroad]

Check the codes, check to make sure the O2 sensor is actually plugged in...

[nunya]

i'd say o2 sensor reading strange running a teat pipe(i am guessing since you said you yanked the converter)

[5523Pathfinder]

Lack of backpressure will not let the EGR system work properly. You may need to reinstall the cat or get a high flow unit.

[pd4surfing]

Thanks for all the input! Much appreciated. I will look into it further

[Precise1]

we also removed the cat.

 

But the cat back on regardless. There is no reason not to run a high flow version. Be responsible...

 

B

[mws]

But the cat back on regardless. There is no reason not to run a high flow version. Be responsible...

 

B

 

I'm with B. A high flow universal is cheap, it won't cost you ANY noticeable hp, may actually add torque, will reduce the tailpipe stench, and is just good karma. Why be a gross polluter when it is so easy not to be?