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Check engine light is on and starts flashing when I reach above 45 miles per hour and car starts bogging. Which of these codes is the most likely cause?

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  • Keith Schapiro Apr 11, 2019

    I'm 90% sure it's not the coil, have had to replace those and when those go bad it's a constant flashing and the car misfires constantly.. and I'm not having those issues. It only flashes and misfired periodically now when I'm over 30mph and give it gas.so I'm thinking H20 sensor.

  • Rocky Ram
    Rocky Ram Apr 11, 2019

    O2 sensor will not cause a misfire

  • Rocky Ram
    Rocky Ram Apr 11, 2019

    You can move the coil from cylinder one and see if the misfire moves to another cylinder...if it don't check compression or injector...have you change you spark plugs

  • Rocky Ram
    Rocky Ram Apr 12, 2019

    p0340 need to take care of that one also

    P0340 Symptoms*
    Check Engine Light
    Vehicle will not start – may be difficult to start
    Rough idle/stall
    Vehicle engine misfire
    Loss of power when driving
    *In many cases there may be no noticeable issues with your vehicle

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  • Cars & Trucks Master
  • 455 Answers

Flashing check engine light it's for a misfire

Posted on Apr 11, 2019

  • Rocky Ram
    Rocky Ram Apr 11, 2019

    Always start with the first code listed.

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  • Cars & Trucks Master
  • 1,360 Answers

It's pointless guessing the answer. Get all of them sorted out or the fault codes will return and the problem won't be solved. Go to two or three independent mechanics and get there opinion.

Posted on Apr 11, 2019

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Posted on Jan 02, 2017

  • 2 Answers

SOURCE: loosing power

Wow, I just went through the same problem and guess what it was a clogged converter and a bad oxyegen sensor. The garaged fixed it up for me by putting an eco converter on it and a new O2 sensor. I have a 2003 Chevy Impala,V6 3.8 engine. Good Luck!!!!

Posted on Mar 10, 2009

  • 201 Answers

SOURCE: i have a 91 F-350 That bogs down at 45 mile per hour and real bad if your pulling a trailer

the culprit could be your fuel filter or the vacuum advance on your distributor.i recomend to replace filter and also do a manuel check of vacuum advance on distributor.

Posted on May 08, 2009

  • 534 Answers

SOURCE: vehicle hakes when driving 45 to 50 miles per hour

Check wheel balance,
check steering linkages for loosness - such as tie rod ends, steering rack linkages etc,
check driveline for worn/loose joints and bearings.

Posted on Jul 07, 2009

budgie140
  • 502 Answers

SOURCE: My car bogs down when I go around 60 miles per

check exhaust back pressure at the headers.should be no more than 6 psi..check fuel cap for venting the fuel tank.some caps dont let air in

Posted on Jul 01, 2010

jessezass
  • 117 Answers

SOURCE: check engine light starts flashing over 45 miles

if your check engine light is flashing you have a misfire bad enough to damage your engine if the problem is not repaired.

Posted on Jan 06, 2011

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check driveline for worn/loose joints and bearings.

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I have a 91 F-350 That bogs down at 45 mile per hour and real bad if your pulling a trailer


the culprit could be your fuel filter or the vacuum advance on your distributor.i recomend to replace filter and also do a manuel check of vacuum advance on distributor.

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Loosing power


Wow, I just went through the same problem and guess what it was a clogged converter and a bad oxyegen sensor. The garaged fixed it up for me by putting an eco converter on it and a new O2 sensor. I have a 2003 Chevy Impala,V6 3.8 engine. Good Luck!!!!

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