Question about Chevrolet Silverado

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I have a 2007 Chevy Silverado Z71 5.3L Tonight i t was running fine and went through a drive through then went over and parked I have straight pipes still have cats, well I rev her up in the drive through then got my food and went to park and bout an hour later started her up she was really bad sluggish didn't stay running tried again she did it again and the engine sounded like it was knocking a bit but the sound was like a lot of pressure/ forced pressure coming from the engine bay my buddy had a similar prob and it was his cat clogged he says it happens when you put straights on a truck basically now I can't get her to run for more than 10 secs not even and it sounds horrible when she does and I can't even hear my exhaust barley any help??

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Plugged catalytic converters are very rare in newer vehicles, the old bedded cats did this that GM used but not the new ceramic grid cats unless the exhaust got cherry red from excess fuel or extreme overloading of the vehicle. The two things you need to do a re this run a fault code test then check the fuel pressure if no codes show up other than a lean code, if all is well have a exhaust back pressure test run.

Posted on Mar 21, 2017


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Posted on Jan 02, 2017

cactus bob
  • 267 Answers

SOURCE: press gas pedal... sounds like exhaust coming out of intake

it might be a clogged car , but did you do the simple thing and remove the fuel filter and try to blow through it ?

Posted on Jan 18, 2009

  • 1 Answer

SOURCE: 2002 pontiac grand prix gtp running really rough and puttin

get your catalytic converter checked, i have a 2002 gt model and GM just replaced the old with a new one free of charge. They have been having problems with them clogging up so they extended the warranty to 190000kms or 10 years. had the same issues as you and when it was replaced all was good, even sounded better. hope this helps and I hope you get the same deal as I did. it is not a recall so you have to bring it up to them. Good luck.

Posted on Jun 05, 2009

  • 1486 Answers

SOURCE: it gets better

Check plugs and wires first.

Posted on Jun 29, 2009

  • 41 Answers

SOURCE: I have 66 with 6 cyl straight line. The engine

misfiring maybe ?spark plugs lead need to replaced ,it is be best if u put all new spark plugs in and lead as well

Posted on Nov 06, 2009

  • 77 Answers

SOURCE: Yesterday i parked my car after a short drive. 3

Sounds like a worn out camshaft position sensor.

Posted on May 21, 2010

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