Vacuum readings?
10-19-01, 11:16 PM
#3
Senior Member
Actually your reading a little low, but nothing to worry about. 38cmHg = 15inHg. That's weird though, I've never seen a gauge with centimeters instead of inches, does your boost read in PSI or Bar?
10-20-01, 02:52 AM
#5
Senior Member
iTrader: (1)
Join Date: Mar 2001
Location: Bedford, MA, USA
Posts: 379
Likes: 0
Received 0 Likes
on
0 Posts
Both my FDs were a little bit funny. Regardless of how hard I tried to adjust, they both idled around 500 rpm. I know that this is about 200-300 rpm less than what it's supposed to. At this rpm, my car gets between 12-14 in/HG. Funny thing is when I add electrical load (such as truning on the parking lights) into the equation, the car automatically ups the idle up to about 700 rpm, and vacuum goes to 15-17 in/HG.
10-20-01, 05:27 AM
#6
Porting, altitude, and idle RPM can change the readings significantly, but most healthy stock-ported engines give 15+ inHg, and ported engines tend to make less vacuum. A street port should give about 12+ inHg.
-Max
-Max
10-20-01, 10:49 AM
#7
Full Member
Join Date: May 2001
Location: Dumont NJ
Posts: 243
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by f2racer
Both my FDs were a little bit funny. Regardless of how hard I tried to adjust, they both idled around 500 rpm. I know that this is about 200-300 rpm less than what it's supposed to. At this rpm, my car gets between 12-14 in/HG. Funny thing is when I add electrical load (such as truning on the parking lights) into the equation, the car automatically ups the idle up to about 700 rpm, and vacuum goes to 15-17 in/HG.
Both my FDs were a little bit funny. Regardless of how hard I tried to adjust, they both idled around 500 rpm. I know that this is about 200-300 rpm less than what it's supposed to. At this rpm, my car gets between 12-14 in/HG. Funny thing is when I add electrical load (such as truning on the parking lights) into the equation, the car automatically ups the idle up to about 700 rpm, and vacuum goes to 15-17 in/HG.
Hey, at least im not alone. My car idles at 500 all the time. As soon as i put my lights on, the idle jumps to about 750. I thought it was just my fd cause i never heard this. Any suggestions?
Thread
Thread Starter
Forum
Replies
Last Post
Jeff20B
1st Generation Specific (1979-1985)
73
09-16-18 07:16 PM
t-von
3rd Generation Specific (1993-2002)
9
09-10-15 01:56 PM