I fixed my FITV on Saturday morning. When I was checking out the car after I finished, I pumped the brake and noticed that <U>ONLY AFTER</U> I let off the brake my RPM's go up just slightly and then come back down? About 150-200 RPM's or so...


Any ideas?


Modified by Bishop4G at 3:35 PM 6/7/2004

 

You let off the gas and your RPM come up?

Or you let off the brake and the RPM comes back up?

If you meant that you take your foot of the brake, then it might be only that your brake booster is taking away some of the vacuum in the intake manifold and your rpm drops a little.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4drEF &raquo;</TD></TR><TR><TD CLASS="quote">You let off the gas and your RPM come up?

Or you let off the brake and the RPM comes back up?

If you meant that you take your foot of the brake, then it might be only that your brake booster is taking away some of the vacuum in the intake manifold and your rpm drops a little.</TD></TR></TABLE>
my car does that. is it bad and does it NEED to be fixed or is it normal.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4drEF &raquo;</TD></TR><TR><TD CLASS="quote">You let off the gas and your RPM come up?

Or you let off the brake and the RPM comes back up?

If you meant that you take your foot of the brake, then it might be only that your brake booster is taking away some of the vacuum in the intake manifold and your rpm drops a little.</TD></TR></TABLE>

Sorry, I fixed the original post. When I let off the brake after a full depression of the pedal, the RPM's go up.

I'm switching over to a Teg Non-abs Booster, prop valve, and MC when I do my 4 wheel disc setup. Will this help clear up the problem or make it worse since it's a bigger booster and MC?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by speed_racer012 &raquo;</TD></TR><TR><TD CLASS="quote">
my car does that. is it bad and does it NEED to be fixed or is it normal.</TD></TR></TABLE>
As far as I know, if the swing isn't too radical it's normal.
Becuse of the power brakes. There is both a difference in vacuum pressure and /or a signal to the ECU to speed up the idle, forget which.
ALL my hondas, change idle speed by a few rpms when you step on the brake.

 

My rex does the exact same thing, so did my EK and my DC2. It's totally normal

 

What booster do you have in now? Stock? Why go with the teg one?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4drEF &raquo;</TD></TR><TR><TD CLASS="quote">What booster do you have in now? Stock? Why go with the teg one?</TD></TR></TABLE>

I have the stock one now yes.
I'm putting together a Teg rear disc setup w/ NSX calipers up front. I'll need the bigger booster and MC to facilitate having two more pistons up front, and higher levels of fluid being pushed to the back from the drum-to-disc conversion.

 

Maybe I'm missing something here, but every Honda will have the RPM shoot up a little after depressing the brake pedal.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr Milano &raquo;</TD></TR><TR><TD CLASS="quote">Maybe I'm missing something here, but every Honda will have the RPM shoot up a little after depressing the brake pedal.</TD></TR></TABLE>
Yes!
Shoot up, drop down or depress pedal, release pedal. LOL
I can't remember the seqeunce. It's only 50-100 rpm. though.
I can't believe this is news to anyone.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bishop4G &raquo;</TD></TR><TR><TD CLASS="quote">I fixed my FITV on Saturday morning. When I was checking out the car after I finished, I pumped the brake and noticed that <U>ONLY AFTER</U> I let off the brake my RPM's go up just slightly and then come back down? About 150-200 RPM's or so...</TD></TR></TABLE>

NORMAL. The way I figure is that its the booster putting a little extra air into the IM when you take your foot of the brake.

Ben

 

It's normal. THe brake booster will take Vacuum to get your brakes to lock. In fact, its normal on all cars man.