SPONSORED LINKS

MISFIRE

Tiny
STRUXGL
  • MEMBER
  • CHEVROLET
I SAW A POSTING ABOUT SOMEONE HAVING TROUBLE WITH MISFIRE ON #5 CYCLINDER ON A 1999 CHEV TAHOE. DO YOU KNOW THE OUTCOME OF HIS PROBLEM?
ALSO, HOW DO I TAKE A VACUM READING ON MY 1998 CHEV TAHOE WITH A 5.7 VORTEC ENGINE? WHERE DO I SCREW IN THE VACUM GAUGE?
SPONSORED LINKS
Sunday, December 3rd, 2006 AT 9:05 PM

3 Replies

Tiny
HYKNRD
  • MEMBER
  • 59 POSTS
Not sure about the outcome of the other guy. A vacuum test is generally done with the engine warmed. You need a vacuum source(hose or pipe) from the intake manifold to hook to the vacuum gauge. All vacuum gauges I've used haven't threaded into anything, just hooked up by a vacuum hose. Plug whatever you disconnected.
At idle the gauge should be steady at about 15-20 inHg. Rev the engine and let off. The gauge reading should drop and then return to normal. If you have a misfiring plug the gauge reading will occasionally drop about 1-5 in. Hg.
Any other readings will let you know any other aspects about the conditon of the engine.
Hope that helps
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Monday, December 4th, 2006 AT 5:12 PM
Tiny
ARIPEKADEBI
  • MEMBER
  • 1 POST
I had my check engine codes checked today. P1281, P0108, P0320, P0351, P0300, P0301, P0303, P0420, P0306, P0307 are the codes that were displayed. I am wondering what your point of view is concerning the amount of codes and what to do to repair.

Thank You for your time.
Was this
answer
helpful?
Yes
No
Thursday, December 15th, 2011 AT 3:38 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,644 POSTS
There are many that deal with misfires. It could be fuel problems, plugs, coil, internal engine issues.
Was this
answer
helpful?
Yes
No
Monday, January 30th, 2012 AT 1:00 AM

Please login or register to post a reply.

Related Engine Misfire Content

Intermittent Misfire
VIDEO
Intermittent Misfire
Instructional repair video
Misfire Random Code P0300
GUIDE
Misfire Random Code P0300
The world of automotive diagnostics can be complex, with numerous codes and potential issues to keep track of. One of the more common engine diagnostic codes is P0300, which...
VIEW MORE

Sponsored links