how to check vacuum?
#1
how to check vacuum?
I'm still troubleshooting my car, stumble/missing.
http://web.camaross.com/forums/showthread.php?t=329594
I checked the fuel pressure, I'm good at 43 key on engine off and 38 engine on idling, holds well. I also checked the resistance of each injector, they are all within spec.
I also disconnected my knock sensor and replaced my lt4 KM with an LT1 KM and reset my computer. Most of the time I'm getting 0 retard but it still retards the timing at times, at WOT though it runs like a raped ape most of the time. It seems that most of the stumbling/missing comes at part throttle and ESPECIALLY when i'm in a high gear and load the engine it bucks. Also at idle it seems to miss a little bit/idles rough. But it seems to run better with the less knock retard it pulls, but there is still something else because it still isn't 100% at idle.
Now I want to check vacuum, so I bought a guage/pump and need to know where to put the hose exactly, i'm not sure. I tried to take out the opti vent tube from the intake elbow and put the guage there, it just read 0. Where am I supposed to read for vacuum???
http://web.camaross.com/forums/showthread.php?t=329594
I checked the fuel pressure, I'm good at 43 key on engine off and 38 engine on idling, holds well. I also checked the resistance of each injector, they are all within spec.
I also disconnected my knock sensor and replaced my lt4 KM with an LT1 KM and reset my computer. Most of the time I'm getting 0 retard but it still retards the timing at times, at WOT though it runs like a raped ape most of the time. It seems that most of the stumbling/missing comes at part throttle and ESPECIALLY when i'm in a high gear and load the engine it bucks. Also at idle it seems to miss a little bit/idles rough. But it seems to run better with the less knock retard it pulls, but there is still something else because it still isn't 100% at idle.
Now I want to check vacuum, so I bought a guage/pump and need to know where to put the hose exactly, i'm not sure. I tried to take out the opti vent tube from the intake elbow and put the guage there, it just read 0. Where am I supposed to read for vacuum???
Last edited by Hawk; 01-15-2005 at 05:36 PM.
#2
Re: how to check vacuum?
The hose to the elbow is a vent-not vacuum. Pick one of the small ports on the side of the intake. You can also monitor vacuum through the MAP sensor via diagnostic software or a scanner.
Thread
Thread Starter
Forum
Replies
Last Post
teal98
Automotive News / Industry / Future Vehicle Discussion
15
09-16-2002 01:23 PM
danielbmx
Car Audio and Electronics
0
08-27-2002 11:11 PM
johnsocal
Automotive News / Industry / Future Vehicle Discussion
21
08-17-2002 01:06 AM
SilverWS6
Automotive News / Industry / Future Vehicle Discussion
13
08-14-2002 09:29 PM
newby
Automotive News / Industry / Future Vehicle Discussion
10
07-27-2002 11:39 AM