Question about 2002 Kia Optima

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Loss of power intermitantly hissing sound from flexpipe cut pipe between flex and cat converter still no change only way to resume power is to place in neutral and rev up to 5-6k rpm what to do

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  • abaker12 Jul 02, 2009

    icut the exhaust pipe before converter and problem continues the catconverter and muffler are no longer part of my exhaust system

  • abaker12 Jul 02, 2009

    i did state that i cut pipe in 1st post help me with this problem and i will give you the best rating poss



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Have convertor checked

Posted on Jul 02, 2009


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2002 nissan altima it sputters like the exhaust is pinched and when coming to stop feels like it is gonna stall and check engine light blinking

The Cat Converter mat be almost blocked ,this can cause this fault. To Check place your hand close to the tail pipe end, a blocked exhaust will make a hissing sound and a continuous pressure will be felt. On a good system you will feel a short pulse as each cylinder fires. The Hiss and pressure will increase with engine speed on a blocked system

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P0420 code in a 2006 Suzuki verona Should I start by changing the downstream 02 sensor in the cat before considering a new cat? I have a leaking front flex pipe would that affect this?

Yes, the leaking flex pipe could cause this code. You need to fix that, clear the code and re test. BUT: This vehicle has had issues with the catalytic converters coming apart and ruining the engine. It can suck catalytic converter pieces into the engine. When the converter is removed, visually inspect for damage.

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Ran over a large rock creating a hole on a braided section(expansion joint?) of my exhaust manifold piping to front exhaust piping on my 1994 Trooper S. What is this braided section called and can it be...

Thats the flex pipe probably attached to your converter. This type of pipe is used because of how the engine sits in the engine compartment and is used to reduce stress on the exhaust system. This can be done at home but it requires wielding skills. The piece you need is the flex joint. If you have not done this before I might recommend you have some assistance with it. With the Downpipe, Flexpipe and Catalytic Converter all being one piece and only needing the flex joint it will take two or three hours.

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Exhaust Flex Pipe; How to replace?

You can change the entire section of exhaust pipe that the flex pipe is in. It's usually bolted to the catalytic converter, on the back end, and to the exhaust manifold at the front end. It's just a matter of unbolting it and bolting on the new section of exhaust with new gaskets. You could also go to a muffler shop and have them cut out the old flex pipe and weld in a new piece of flex pipe in it's place. It's for you to decide which option is best for you, and for your wallet.

Feb 24, 2011 | 1994 Toyota Camry

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I took my 1995 Ford Aerostar to have the flexpipe, muffler, and tailpipe replaced. I shopped around, and Budget Muffler in Kent Ohio stated that they would repair the care for $160+tax. When I picked...

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.

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2 Answers

My car is failing enspections because of a leak near/at flex pipe area. im not sure if i should just get a patch or replace the whole exhaust

if it is at the flex pipe, it is difficult to just get a patch.....i would just replace that section of the pipe, or worst case scenario, get a whole new exahust, but get the exhaust shop to use your catalytic converter and muffler, if there are no problems with them, this will cost you heaps

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1 Answer

My 2003 Ford Escape (3.0 V-6)was running fine when I noticed a hissing noise from the exhaust. A flex pipe right before the catalytic converter had a serious leak in it. I have 75,000 miles on it. It drove...

You have to get the emissions readings done on it and find out if all of the emissions controls are doing their job properly. If something is causing clogging, it will show up during this test. (rich emissions) you would either have to repair the main cause or trade it in. Good Luck.

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1 Answer

2005 Ford Focus flex pipe repair

Advance auto and auto zone sell just the flex pipe. You will need to have someone cut the old one out and weld the new one in. costs about $20 for part vs $300 for pipew/catalitic converter attached.

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1 Answer

Is the flexpipe connected to the catalytic

In a lot of vehicles the flex pipe is in the same pipe as the cat. Only way around replacing the whole pipe is to bring it to an exhaust shop and have them weld in a new flex section. It's a pretty common practice on 90's Camry's. Expect to pay about 150-300 depending on local prices.

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Check engine light

Had the same codes on my truck. cat converter was plugged. I was told to take the cat off and gut it, then put it back on and it would run fine, but that didn't work. You need a new cat. Might want to replace the o2 sensors before and after the cat also. Hope this helps.

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