New exhaust system affect engine? - Off-Road Forums & Discussion Groups
GM Small Trucks & SUV's All discussion of S-Class Trucks and SUV's

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 04-10-2001, 10:40 PM
**DONOTDELETE**
Guest
 
Posts: n/a
New exhaust system affect engine?

I am probably going to get a Magnaflow muffler with one pipe in and 2 out soon(It sounds a lot like a V-8). I plan on getting a 2" or 2.5" pipe, and my questin is: will this modification affect the performance of the vehicle at all? I have heard that the computer has to "re-learn" after the new exhaust system and it might take awhile to do so. How common is this problem? I am just being cautious. Thanks for the help.
Scott

Sponsored Links
Advertisement
 
post #2 of (permalink) Old 04-13-2001, 07:17 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: New exhaust system affect engine?

-Scott
What year model and engine size do you have? I have a 97 Blazer with the 4.3L vortec. I had a Flowmaster muffler installed with 2.5" out and I'm still having problems with it. My mileage and performance have both dropped. However, a friend of mine owns a 1990 Jimmy with a 4.3L and installed a Flowmaster and saw an increase in both mileage and performance. Results may very, and in my situation, the computer and/or sensors just don't seem to be making the adjustment to the new muffler. Let me know what you decide or if you have any questions.

-Pete

post #3 of (permalink) Old 04-15-2001, 05:46 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: New exhaust system affect engine?

you may have a problem with the o2 sensor, this may cause the check engine light to come on, and when this happens it causes the mixture to richen and wreck your fuel mileage, if the light dont come on, you are fine. you should see improvement in power and mileage. If it does come on there is not enough restriction. You can cause these computer controlled engines to breathe too well. Good Luck

My truck is not rusty, that's caked on mud. Jason
Sponsored Links
Advertisement
 
post #4 of (permalink) Old 04-15-2001, 07:09 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: New exhaust system affect engine?

I have a 70 series Flowmaster, 2.5" in and 2.5" out. My truck runs better and gets better mileage. While I had the old muffler off I decided to run it like that to see what would happen. It still wasnt all that loud but the engine would not idle down properly and going down hill it would fly [img]/wwwthreads_images/icons/laugh.gif[/img]. They need a certain amount of backpressure to run properly. The trick is to get rid of as much you can without getting rid of too much. Good luck.

post #5 of (permalink) Old 04-16-2001, 09:33 AM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: New exhaust system affect engine?

I have a 1997 4.3L Vortec engine. Thanks for the advice guys, I generally have bad luck with vehicles but still think that it is worth it for me to get a new exhaust system. I really want improved mileage and horsepower (I already have a K&N). I have a local shop that could figure the engine light out if I had trouble I think. I am looking at the 40 series Flowmaster now too, but it will be mid summer before I get the system. I wonder if I got 2" pipes as opposed to 2.5" if it would eliminate some possible problems for me. Any input would be helpful. Thanks guys.

post #6 of (permalink) Old 04-16-2001, 02:41 PM
 
Join Date: Dec 2000
Posts: 558
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: New exhaust system affect engine?

For One thing Guys Bigger Is Not Always Better On a 4.3 With Singles Exhuast Yes you can run 2.5" pipes but For Bacpressure reasons alot of After market Exhaust sys are made to Flow Alot better the n Stock So Staying with 2" pipes will Keep the backpressure at a point the computer will like and Plus with the after market exhaust your engine will thank you by running longer
As far as the Computer is concerned try This Disconnect the battery For bout ten minut's this will make shure the Computer memory is Clear then hook battery back up start truck up and Drive normally the computer will then Reset itself to the way the engine is running at the time unless there is a major problem one of the sensors is picking up
Hope this helps guys


Nissan_King_84

1984 Nissan King Cab 4x4
http://www.geocities.com/nowheres/Paul_s_720_Page.html
Nissan_King_84 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome