After replacing a tore up Flex pipe my does not accelerate

Tiny
ALEXIS23
  • MEMBER
  • 2004 KIA SORENTO
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 154,000 MILES
So I had replaced a tore up flex pipe. Now my car doesn't accelerate probably goes 5 mph. It sometimes has some pick up and then about one minute. Later I'm pressing the gas and no acceleration. I'm confused as to replacing the tore up flex pipe and now no power to accelerate? Was I better of with the loudness and holes in the flex pipe?
Friday, October 11th, 2019 AT 3:58 PM

7 Replies

Tiny
STEVE W.
  • MECHANIC
  • 14,490 POSTS
Welcome to 2CarPros. Your description sounds like the exhaust is plugged partly, likely by pieces of the flex pipe as it came apart. A quick way to test this would be to disconnect the Y pipe at the rear connection and see if the power returns. If it does you will likely need to check the converter and see if it's plugged or seriously restricted. You might be able to remove it and blow the restriction out if it is something like pieces of rust. I doubt it is farther back although it could be in the muffler if it was driven a while, that is because the exhaust heat also dries out the pipes and pieces and driving with the leak lowered the heat through the system and the interior of the muffler could have corroded and blocked itself.
Dropping the pipe at each joint is a quick test.
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Friday, October 11th, 2019 AT 5:23 PM
Tiny
ALEXIS23
  • MEMBER
  • 4 POSTS
Thank you. I feel like it's simple. I will have someone look at it tomorrow. Hopefully find the problem. Thanks again
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Friday, October 11th, 2019 AT 5:44 PM
Tiny
STEVE W.
  • MECHANIC
  • 14,490 POSTS
You're welcome. Please let us know what you find.
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Friday, October 11th, 2019 AT 7:04 PM
Tiny
ALEXIS23
  • MEMBER
  • 4 POSTS
So I went to take my car in to check the exhaust like you said. But now the car doesn't start it turns over but now doesn't start and it's not the battery or the spark plugs. Now I'm thinking ignition coil or the crankshaft position sensor.
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Sunday, October 20th, 2019 AT 3:32 PM
Tiny
STEVE W.
  • MECHANIC
  • 14,490 POSTS
Okay, with the new symptoms try spraying a bit of starter fluid into the intake, that should give you a direction, if it tries to fire and run on the spray then your issue is likely a fuel pump issue. It could cause both the low power surging and the no start now. Sometime you can get them to work if you give the bottom of the tank a good whack. That would tell you for sure it's a failing pump.
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Sunday, October 20th, 2019 AT 4:33 PM
Tiny
ALEXIS23
  • MEMBER
  • 4 POSTS
Ok will try it out. Also even if it was running before? The fuel pump could now be the problem?
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Sunday, October 20th, 2019 AT 4:57 PM
Tiny
STEVE W.
  • MECHANIC
  • 14,490 POSTS
Yep, they can be working and quit while you are driving down the road. They are not hard to test on most vehicles. This isn't for your exact vehicle but gives an idea of the process.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Sunday, October 20th, 2019 AT 5:27 PM

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