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1999 Chevy Silverado VACCUM TEST

Tiny
LBOLTON
  • MEMBER
  • 1999 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 371,000 MILES
How do I check for vaccum leaks on my 1999 Silverado 5.3L v8
Sunday, March 15th, 2009 AT 9:58 AM

3 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Get a can of spray throttle body cleaner, spray the vac lines and maniflod area, when the idle changes, youve found the leak! You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs!


https://www.2carpros.com/forum/automotive_pictures/62217_CRC_Throttle_Body_17.jpg

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Sunday, March 15th, 2009 AT 10:06 AM
Tiny
LBOLTON
  • MEMBER
  • 7 POSTS
My service engine light came on again today and the code reads "P0358" defined as "ignition coil H primary/secondary circuit malfunction" Please tell me the part involved that should be repaired and or replaced.
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Monday, May 11th, 2009 AT 9:10 AM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Check cylinder #8 coil wire and coil for firing. Plug could be NG as well.
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Monday, May 11th, 2009 AT 3:53 PM

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