2005 Chevy Silverado troubleshooting

Tiny
DTOMLIN9365
  • MEMBER
  • 2005 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 43,100 MILES
Engine falls flat under load and sounds like spark knock checked for codes and got code p0300 multipel misfires changed plug did not help
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Wednesday, July 21st, 2010 AT 4:15 PM

14 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Have you checked fuel pump pressure?
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Thursday, July 22nd, 2010 AT 12:10 AM
Tiny
DTOMLIN9365
  • MEMBER
Yes had 60 pounds and no less than 58 while driving
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Thursday, July 22nd, 2010 AT 5:39 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
It sounds like a timing issue. Have you checked the knock sensor?
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Thursday, July 22nd, 2010 AT 11:46 PM
Tiny
DTOMLIN9365
  • MEMBER
We did replace the crank sensor if that is what you are talking about
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Friday, July 23rd, 2010 AT 12:53 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
They are two different items. The knock sensor's job is to keep engine timing at it optimum position, just before you get valve ping. Here is a picture:


http://www.2carpros.com/forum/automotive_pictures/249084_5_28.jpg

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Saturday, July 24th, 2010 AT 1:03 AM
Tiny
DTOMLIN9365
  • MEMBER
Went to shop and ask about knock sensor mechnic put tester on and drove said knock sensor was working and that he thought maybe converter had came apart but no codes for o2 only codes we get are maf vaf the misfire p0101 andp0300
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Saturday, July 24th, 2010 AT 10:09 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Have you tried cleaning the MAF?
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Saturday, July 24th, 2010 AT 11:03 PM
Tiny
DTOMLIN9365
  • MEMBER
Put new one on did not help
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Sunday, July 25th, 2010 AT 10:48 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Any vacuum leaks, hoses, intake.
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Monday, July 26th, 2010 AT 1:54 AM
Tiny
DTOMLIN9365
  • MEMBER
We have checked but did not find any leaks
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Monday, July 26th, 2010 AT 6:01 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
If you have a good hot blue spark, good fuel pressure, and the timing and compression are good, the only other thing I can say is there is a vacuum leak. Chances are the intake.
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Monday, July 26th, 2010 AT 9:26 PM
Tiny
DTOMLIN9365
  • MEMBER
Ok still working on it will let you know what we find wrong
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Monday, July 26th, 2010 AT 10:29 PM
Tiny
DTOMLIN9365
  • MEMBER
Found out that the left side catalytic converter is stoped up is under warranty so have at chevy shop to be replaced thanks for your time and help
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Monday, August 2nd, 2010 AT 4:41 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Glad to help. Let us know if you have questions in the future.
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Tuesday, August 3rd, 2010 AT 1:03 AM

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