after i put a 2 1/4 inch test pipe on my ride it smokes..as soon as it was put on and started was when i noticed the smoke....what can i do to fix this? i dont want to get a high flow cat because i love the sound and performance

since you put in a testpipe--you got ride of the cat...which filters out the smoke, without at filter, all the nasty stuff that didn't get out before, now gets out....

'99 RS
gone, never forgotten

'03 BMW 330i 5speed

'00 Jeep Grand Cherokee Limited 4.7

so juss dont worry bout it or what?? cas it looks nasty when me and my girl go ridin or to a meet to street race....

Are you sure its not just the weather??? I took my Cat. Conv. off about a year now, but mine never smoked that bad. It does now because of the weather in the morning. But once it gets going...you can hardly see anthing...

1995 Eclipse RS

ok after I had the cat cut off the plugs are black I've pulled them 3 days in a row and cleaned them and they keep gettin black again,what's causin diz,it didn't happen untill the cat was cut off

your plugs are getting black because after pullin the cat, your downstream o2 sensor is reading diffferent mixtures of air and fuel, and the ecu drops a lot more fuel to be "safe" when your o2 sensors fail.

black ressidue on your plugs means your runnin rich, which hinders performance, yet keeps your engine from blowin up...

the smoke is somewhat normal, but i would reset your ecu, or disconnect your neg cable on your battery for a good 10-20 minutes, and see what your plugs look like 5 days after....

good luck

03 srt-4 13.130@112.47mph (n2o, stock turbo, 10/2003)
now: 20g, portfueler, bpu+++ (track/dyno times tbd...)

i farted on your wiki

ok .... i'll try it and let u know how it goes...

>your plugs are getting black because after pullin the cat,
>your downstream o2 sensor is reading diffferent mixtures of
>air and fuel, and the ecu drops a lot more fuel to be "safe"
>when your o2 sensors fail.

This is not correct. The downstream o2 sensor does not effect the mixture AT ALL. All it does is trigger the CEL when it senses unburnt fuel passing the cat., for emissions purposes.

Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician

Thats ^^^^^ what I thought aswell....

I thought that the rear O2 sensor did not affect the fuel curve at all. I was under the understanding that it was just there to tell you if your CAT was bad (or missing) hehe

I had my CEL on from a gutted cat for several months and did not notice my car running any more rich than before ie, no extra smoke out the back, loss in performance, nor worse gas mileage. I did finally fix the CEL this past weekend with the little resistor.

Chad

MODS:
3" PVC CAI, GST Muffler, Greddy 4-1 Header, AFX UDP, 55 mm bored TB, P&P Intake Manifold, Corbin intake spacer, gutted cat, Apexi S-AFC, KYB AGX Struts, Eibach Prokits, Excel TZ-10 Rims

i got alot better performance and bad gas millage better sound cel was on until i unhooked the battery to restart the computer then it went off.....havnt checked the pluges yet ...i'll let u know how everything turnsout

oz_gs what resistor did u use or did u use a casper electronics o2 simulator?

You can have it cheap, fast or good. Pick any two.

If you want it cheap and fast, it's not going to be good.
If you want it cheap and good, it's not going to be fast.
If you want it good and fast, it's not going to be cheap.