Engine revs when brake is pushed
#1
Rotary Enthusiast
Thread Starter
Join Date: Aug 2002
Location: Marietta, GA
Posts: 1,102
Likes: 0
Received 0 Likes
on
0 Posts
Engine revs when brake is pushed
Just had my RE motor rebuilt and put in. It has a single turbo TO4E with an RX-7 store fuel sytem, 850 primaries and 1600 secondaries. The motor idles like it is breathing, up-down, up-down and when the brake is pushed it revs the engine. Now the gas pedal also revs the engine so they are not swithed somehow. Any ideas?
#2
slurpee
iTrader: (3)
so... when u push the brake, you get a throttle like response, or when u push the brake u get somewhat of a higher idle? cuz if you get throttle response from the brake... someone somewhere put some work on ****** ur car up
if it only raises ur idle slightly, you could have somewhat of an electrical issue
such as when my car is idling and i turn the running lights on it will make the RPMs fluctuate for a second, it will jump to 1100 rpms and then normal out
if it only raises ur idle slightly, you could have somewhat of an electrical issue
such as when my car is idling and i turn the running lights on it will make the RPMs fluctuate for a second, it will jump to 1100 rpms and then normal out
#4
Full Member
Join Date: May 2007
Location: Vancouver/Yokohama
Posts: 211
Likes: 0
Received 0 Likes
on
0 Posts
almost certainly a vacuum leak, it may not just be confined to the brake booster as a vacuum leak anywhere will cause the problem. start hunting down vacuum leaks my friend, you have a big task at hand. i'm about to start a vacuum leak hunt myself. gonna be a pain in the ***.
you may as well replace your hoses with either oem, silicone or viton ones as well, and make sure to have the little replacement nipples you can buy from dale for 15$ a set. also if you're removing hoses, cut the old ones off by slicing the ends first, don't pull them off or you'll break solenoids and all kinds of other stuff in the process.
you may as well replace your hoses with either oem, silicone or viton ones as well, and make sure to have the little replacement nipples you can buy from dale for 15$ a set. also if you're removing hoses, cut the old ones off by slicing the ends first, don't pull them off or you'll break solenoids and all kinds of other stuff in the process.
#7
Rotary Enthusiast
iTrader: (25)
^^LOL
I'm assuming we're talking about a manual transmission?
Try taking off the vacuum hose going to the brake booster, and plugging it with your finger. Then have someone else step on the brake and see if the problem still occurs (super unlikely to still happen). That would narrow it down the brake booster being your vacuum leak.
I'm assuming we're talking about a manual transmission?
Try taking off the vacuum hose going to the brake booster, and plugging it with your finger. Then have someone else step on the brake and see if the problem still occurs (super unlikely to still happen). That would narrow it down the brake booster being your vacuum leak.
Trending Topics
#8
lol at merlins pic.
Anywho, this sounds like a vacuum leak, but if it is just a very low surge in idle when the brake is pressed that sounds like a ground/electrical issue. How high is it reving up? Is it 100 rpms or 1000?
Anywho, this sounds like a vacuum leak, but if it is just a very low surge in idle when the brake is pressed that sounds like a ground/electrical issue. How high is it reving up? Is it 100 rpms or 1000?
#9
Rotary Enthusiast
Thread Starter
Join Date: Aug 2002
Location: Marietta, GA
Posts: 1,102
Likes: 0
Received 0 Likes
on
0 Posts
It revs very high, like 3000 to 4000 so I guess it is a vacuum leak somewhere. How do you narrow down where it is besides the hose on the brake booster? Would a leak down test show a leak or not?
Thanks for all the help!!
Thanks for all the help!!
#10
Senior Member
iTrader: (2)
Join Date: Mar 2007
Location: DUBLIN
Posts: 414
Likes: 0
Received 0 Likes
on
0 Posts
so... when u push the brake, you get a throttle like response, or when u push the brake u get somewhat of a higher idle? cuz if you get throttle response from the brake... someone somewhere put some work on ****** ur car up
if it only raises ur idle slightly, you could have somewhat of an electrical issue
such as when my car is idling and i turn the running lights on it will make the RPMs fluctuate for a second, it will jump to 1100 rpms and then normal out
if it only raises ur idle slightly, you could have somewhat of an electrical issue
such as when my car is idling and i turn the running lights on it will make the RPMs fluctuate for a second, it will jump to 1100 rpms and then normal out
#15
Racecar - Formula 2000
#16
Thread
Thread Starter
Forum
Replies
Last Post
CaptainKRM
2nd Generation Specific (1986-1992)
14
08-26-15 09:52 PM
zuesskroph
2nd Generation Specific (1986-1992)
0
08-13-15 06:05 PM