How do I check for vaccum leaks on my 1999 Silverado 5.3L v8
Mar 15, 2009 at 9:58 AM
1999 Chevy Silverado VACCUM TEST
1999 CHEVROLET SILVERADO
LBOLTON
- MEMBER
- 7 POSTS
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MERLIN2021
- ✓ASE Certified 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!
Mar 15, 2009 at 10:06 AM
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.
May 11, 2009 at 9:10 AM
MERLIN2021
- ✓ASE Certified Mechanic
- 17,250 POSTS
Check cylinder #8 coil wire and coil for firing...plug could be NG as well.
May 11, 2009 at 3:53 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.