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post #1 of (permalink) Old 02-20-2001, 08:43 PM
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Exhaust Problems

I have a 1997 Chevy S-10 Blazer 4WD, 4.3L Vortec engine, auto trans., about 85,000 miles. In attempt to improve my gas milege and performance, I had a Flowmaster muffler installed. However, my gas milege has gotten much worse. With the stock muffler I was getting about 16 MPG and now with the Flowmaster I am getting about 12 MPG. I have a series 50 DeltaFlow Flowmaster with a single 2.5 inlet and a single 2.5 outlet. I just had a new catalytic converter put on and still suffer from loss of gas milege. I recently installed a K&N Air Filter to help with the airflow. It seems I have lost some performance at the lower end torque level but not at the higher.

Any help or comments would be appreciated. Thanks.

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post #2 of (permalink) Old 02-21-2001, 11:32 AM
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Re: Exhaust Problems

That is a similar setup that I have and it improved all the way around.. Have you tried new plugs/wires? Injector cleaner? Mabe the O2 sensors are in order.. 2.5 is what I did and it didn't kill low end much at all for me.. Just to be safe you might try a compresion check.. Might be a worse problem than you think..

-Troy '<font color=red>WeaZle</font color=red>' McCarty

post #3 of (permalink) Old 02-24-2001, 02:27 PM
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Re: Exhaust Problems

Thanks for your response. I'll be putting new plugs in shorty. I haven't tried any type of injector cleaner yet. It just seems rather odd that all these problems began when I had the Flowmaster installed. About a week ago, I started from a complete cold start/boot to force all of the sensors to readjust. I also had my vehicle scanned with a diagnostic scanner and it says that all the sensors are working properly. I probably will get a compression check done just to be on the safe side.

Any other suggestions out there?

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post #4 of (permalink) Old 02-25-2001, 01:55 PM
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Re: Exhaust Problems

Resetting the computer to "adjust" to the settings was a good start. It may be possible that the stock settings you have are not fully compensating for the added intake/exhaust airflow. Might want to look into a chip replacement that will compensate for all of that.

Another idea, and I only put this out because I know this is what I would do. Are you sure that you're not hitting the gas more because of your newfound power and sound? [img]/wwwthreads_images/icons/smile.gif[/img] If it were me I'd lose gas mileage like that just from goosing the throttle a lot... but then again I'm just that way!

J.R. [img]/wwwthreads_images/icons/cool.gif[/img]

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post #5 of (permalink) Old 02-25-2001, 02:29 PM
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Re: Exhaust Problems

Thanks for the response J.R.

I've looked into some chips, and have spooke with some techs about this problem, most say that a 97 model chevy should be able to adapt without any problems. They did mention that there are those "odd ball" vehicles that won't change for anything unless you change the chip or programming.

I will admit, that the first couple of weeks after I had the Flowmaster installed, I was goosing it just a little more then normal just to hear that wonderful Flowmaster growl, but I've been driving regularly for quite some time now and still am getting rather bad gas milege.

Any other thoughts or ideas out there? Thanks.

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