If I remove the catalytic con. wil it mes the fuel injection up can I reset the compt to fix? 95 Astro Where c

Question

Its a 4.3 without air cond. It runs strong but can do much better. I am mostly going for fuel economy, Its my mobile work van. I already have a 3 inch exhaust with flow master but would like to open the intake and exhaust a bit .I have a high flow cat that's ready to be replaced but i can get better results through tuning and and less restrictive intake?exhaust. I would prefer dual, with H , but would like to find headers will s-10 headers fit? any help is greatly appreciated

Thankyou. I don't have deq where my van is registerd. can't I jump the code port to stop any error codes? I mostly drive in the city and short stints on the free ways. mostly onramps and green lights. I'm getting about 18-25 miles to the gallon but I know it can still do better, I would like to add airbags and taller tires. The cat only lasted a 3/4 year, I drive alot. would it be better to run one larger pipe or two saller pipes. I need to get rid of the cat, its causing high temps and loss of power. All the halfway deacent hi flow cats Ive found, run about 250. Any suggestions?

again, The van is deq exempt and astro vans are sweet!! thank you fellas, I appreciate the input, where mite I find a programmer? Do I need to buy one or can I barrow it. Is it something I can have a shop do?

Answer 1

You could actually do harm to your engine in this way. What most people don't realize is that you LOSE power from doing this and it will have no impact on your fuel economy at all (if anything it will decrease it). You have an o2 sensor that determines how much fuel to dump in and air. By tampering with the cat, you'll end up messing with the o2 sensor and your car will run terrible. You will not pass emissions and the cops WILL hear you. I did this to my firebird and got a 2500 dollar fine. It does happen. Cops can tell because of how loud it is. You're better off leaving it as it is.

Answer 2

In most places this is ILLEGAL and can result in a BIG FINE.
Yes you can do it, but unless you can trick the aft O2 sensor into thinking all is fine with the catalytic you will get error codes (check engine light).
Because of the fines and other problems with removing this item I would suggest just up grading to a hi flow cat system with a low restriction exhaust.
Be careful not to go too big on the pipes as low RPM engines such as you have will suffer in performance with the wrong choice.
Also the choice of headers can have a negative influence on performance. Tri-wye's are best for the RPM range where this baby will run. If you can find them.
Just as intake runner size affects where the engine runs most efficient at (due to harmonics) so does the size and length of the exhaust system.
So while something may look good on paper, remember that most likely your engine will be run at 3K or less. Pick parts accordingly

Answer 3

Removing a cat con can be done. What will happen is the PCM will realize the oxygen sensors are not working as designed and set codes. This might alter the injection/timing curves and therefore alter performance and certainly gas mileage. What you have to find is an aftermarket computer program that takes into account the missing data for the oxygen sensors. I think you're trying to do too much for an Astro van.

Answer 4

In the U.S., Cat. converters are required on a federal level. I live in Colorado and last year they did away with emissions tests(atleast locally) so that wouldnt be a concern, but any modified exhaust that increases sound or contaminant output is illegal, and a minimum ticket of around $170. I dont know a lot about your specific vehicle but have you looked into a larger air intake(CAI), as well as higher flow intake/exhaust manifold? Also at the begining you said you wanted better MPG, I think removing or gutting the cat would probably bomb your fuel economy.

Answer 5

Removing the cat will not affect your fuel injection, however the computer usually checks the 02 sensors before and after the cat. If it determines that they are not acting properly, they will through an error in the computer which may affect your performance by the computer trying to take measures to compensate for the difference. Your best bet is just to replace the freeflow cat with another freeflow cat. They are cheap, won't affect your computer and will keep you passing emissions.

Answer 6

No, a catalytic converter has no longer something to do with the gasoline performance of the motor vehicle, it incredibly is only there to administration the factor of the exhaust with are volatile to be released directly to the ambience. i think of the mileage has larger by way of a pair different reason, it has no longer something to do with this.