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Re: My 1991 Ford Probe GT wont accelerate or high RPM
Hmm sounds like you lost all your backpressure that your computer needs to set the incoming mix's to..o2 sensor cant work that fast if it's rushing out no muffler ..cars with comp controlled fuel systems need their back pressure :)
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DIY Replace Back Muffler / Resonator with Straight PipeSubject: DIY Replace Back Muffler / Resonator with Straight Pipe Title: Increase Fuel MPG by Replacing Back Muffler
Overview: When your back muffler fails, and or if you want a bit more gas milage, replacing the back muffler with a straight pipe seems to work fine and increase MPG. This is much cheaper than purchasing a back muffler with DIY or to have a local customer shop install a straight pipe.
Symptoms: Back muffler failing, onion peeling and / or holes in the back muffler.
Experience Level: Medium
Tools Needed: Hack Saw, Ratchets, Wrenches, etc.
Time Needed: About 1 hour:
Parts Needed: Pipe parts from local auto store. Exhaust sealers, hangers, pipe tip (stainless)
Procedure: Remove the back muffler by cutting the pipe before the muffler about 2 inches in front of the muffler. Replace with straight pipe components or have a shop do it. You will need some time to get it 100% right. It took me a couple of tries.
Outcome: - Money savings in replacement. - Slightly louder, but not much. Actually a better sound (subjective) - 1-5 MPG gas savings, especially on open road.
Discussion: I have done this on a 99 9-5 I4 for about 1 year now and it seems to be working fine. I am getting about 3+ MPG on the open road since this was done. It is an automatic with 140k miles solid 29-30 MPG with regular fuel on the open road. I really do not see the need for the back muffler / resonator at the present time.
I will be doing this on a 2001 V6 wagon soon. The muffler will be failing soon.
If you have no catalytic converter and replace the muffler with a straight pipe,, you WILL NOT BE ABLE TO HEAR YOURSELF THINK!!.. I took the converter off mine and it was SOOO loud.(have a Flowmaster dual outlet).. It WAS TOO LOUD.. I put a 28" "glasspack" inline..WHEW.. I can actually hear the radio now!!!
The screaming and high RPM means the transmission is downshifting as it should be. The code 420 is for catalytic converter low efficiency bank one, which could be an exhaust restriction or a fuel problem. The easiest way to find out if it is a restricted exhaust is to remove the exhaust system where the cat connects to the pipe from the motor and test drive it a short distance. The restriction could be in the connector pipe between the cat and the muffler, or inside the muffler. A mechanic could also use an inferred heat thermometer to check the pipe temp from the engine back to the muffler while the engine is running.
You are right. The engine flexes differently, but not less. The designers that put the engine sideways also put the flex pipe in the design, and the shop is just saving money. I'm a mechanical engineer, and I can tell you the stresses on the joints will be higher without the flex pipe. I can't say for sure something will crack, but it is certainly more likely.
BEST TO LET MUFFLER SHOP DO THE JOB FOR YOU.BECAUSE EXHAUST SHOULD NOT RUN CLOSE TO FUEL TANK AND FLOOR PANEL FACTORY PUT HEAT SHIELDS UNDERNEATH VECHICLE WHERE EXHAUST RUNS UNDERNEATH.LET THE MUFFLER SHOP DO THE EXHAUST PIPE WORK.PIPE HAS TO BE BEND IN A WAY IT WONT DRAG HIGH WAY AND HIGH BUMPS IN THE ROAD.
The only component that must stay in place to pass federal emissions is the catalytic convertor. If you are not concerned with emissions then a straight pipe will be fine. There will not be any adverse performance problems with a straight pipe. Please rate my help this helps me out , Thankyou RJ