What am i missing?
01-09-13, 10:57 AM
#1
Full Member
Thread Starter
iTrader: (1)
Join Date: Jan 2012
Location: WA
Posts: 129
Likes: 0
Received 0 Likes
on
0 Posts
What am i missing?
1987 rx7 n/a
This is a brand new rebuilt engine, and when i fire it up it runs as long as i give it gas and keep the rpms up slightly, but it will not hold an idle.
Besides issues with timing and a vacuum leak, what else could be the cause of this kind of behavior?
note: Installed a brand new wiring harness from mazda (don't think that really affects anything but throwing it out there just incase).
This is a brand new rebuilt engine, and when i fire it up it runs as long as i give it gas and keep the rpms up slightly, but it will not hold an idle.
Besides issues with timing and a vacuum leak, what else could be the cause of this kind of behavior?
note: Installed a brand new wiring harness from mazda (don't think that really affects anything but throwing it out there just incase).
01-09-13, 11:22 AM
#3
Moderator
iTrader: (3)
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 30,993
Received 2,691 Likes
on
1,905 Posts
i vote vacuum leak, there is so much stuff you have to install on the engine, that its rare that everything is happy right away. its probably something dumb, like an unplugged AFM or loose clamp or something.
the TPS and timing are probably off too, which doesn't help, but hard to set on a cold engine
the TPS and timing are probably off too, which doesn't help, but hard to set on a cold engine
01-09-13, 11:46 AM
#4
Full Member
Thread Starter
iTrader: (1)
Join Date: Jan 2012
Location: WA
Posts: 129
Likes: 0
Received 0 Likes
on
0 Posts
Could it perhaps be something on the intake that i need to adjust?
01-09-13, 11:48 AM
#5
Full Member
Thread Starter
iTrader: (1)
Join Date: Jan 2012
Location: WA
Posts: 129
Likes: 0
Received 0 Likes
on
0 Posts
i vote vacuum leak, there is so much stuff you have to install on the engine, that its rare that everything is happy right away. its probably something dumb, like an unplugged AFM or loose clamp or something.
the TPS and timing are probably off too, which doesn't help, but hard to set on a cold engine
the TPS and timing are probably off too, which doesn't help, but hard to set on a cold engine
Anyways, thanks for the feedback.
01-09-13, 12:54 PM
#6
Fresh used housing rotary builds do not run 100% normally right off the bat. It is common to have to bump up the idle to the 1200-1500 range to keep them running stable for a few days or weeks until compression comes up some. If yours does not want to idle at 800, then don't try to get it to, raise the idle to 1500 and put some miles on it, then revisit the idle adjustments in a month or 2.
01-10-13, 12:00 AM
#7
Full Member
Thread Starter
iTrader: (1)
Join Date: Jan 2012
Location: WA
Posts: 129
Likes: 0
Received 0 Likes
on
0 Posts
Fresh used housing rotary builds do not run 100% normally right off the bat. It is common to have to bump up the idle to the 1200-1500 range to keep them running stable for a few days or weeks until compression comes up some. If yours does not want to idle at 800, then don't try to get it to, raise the idle to 1500 and put some miles on it, then revisit the idle adjustments in a month or 2.
Trending Topics
01-10-13, 12:18 AM
#8
Retired Moderator, RIP
iTrader: (142)
Join Date: Sep 2005
Location: Smiths Falls.(near Ottawa!.Mapquest IT!)
Posts: 25,581
Likes: 0
Received 131 Likes
on
114 Posts
Case and point: I missed a vac line on my N/A and it would sit at 1200 with a lopey idle..
I found it,fixed it.BOOM! 800 Rpm,rock solid.
Thread
Thread Starter
Forum
Replies
Last Post
Turblown
Vendor Classifieds
12
10-17-20 03:25 PM