Help!!

Ed Wright · 03-23-2011, 08:28 PM

I hope you guys have an idea about this. When I let go of the trans brake button my car has begun to cut off & back on real quick. About a tenth off in 60' when it does it. Often only first pass of the day. I have tugged on wires, tightened grounds, replaced the trans brake solenoid, MSD box, crank trigger, disconnected the tach, etc. The battery voltage to the XFI ECU doesn't change when it does this. Two new NAPA batteries also. Only thing I wanted to replace last week was the microswitch on my Biondo button. Have a new on now. Going to test again Saturday. I would appreciate any ideas.
Thanks, Ed

Chad E532 · 03-23-2011, 09:15 PM

Ed,
Have a look at this product from Shogun.

https://www.shogunindustries.com/cgi...ew_item=101003

It might be worth a call up there to see what their engineers have to say about your issue.

Chad

Ed Wright · 03-23-2011, 09:52 PM

Chad, a couple of years ago I asked about that and was told it was illegal for SS. I have wondered about a simple capacitor to try to dampen posdible voltage spikes. Pete Peery says he has a microswitch not open cleanly so it was bumping the 2 step again. I waited too long last week to find another microswitch and the problem was still there at the track Sunday. New one on it now, just looking for more things to look at before I take it back out Sat.

Thanks.

Ken Etter · 03-23-2011, 10:07 PM

I had an intermittant miss in my SS car. Drove me crazy,tried everything.Turns out it was the microswitch in the TB button. The vibrations would make it activate the 2 step. I replaced the switch and mounted the button on rubber to try to isolate vibrations.

Myron Piatek · 03-23-2011, 10:23 PM

If it's only on the first pass of the day, perhaps it could be something related to the carb/jetting/vacuum signal. It may be momentarily too lean because the engine isn't "heat soaked" from previous runs and bogging.

Chad Rhodes · 03-23-2011, 10:39 PM

Quote:

Originally Posted by Myron Piatek

If it's only on the first pass of the day, perhaps it could be something related to the carb/jetting/vacuum signal. It may be momentarily too lean because the engine isn't "heat soaked" from previous runs and bogging.

now you're gonna have Ed searching all over that LT one for a CARBURETOR. I know he's old but don't mess with him like that, lol.

Ed Carpenter · 03-24-2011, 11:32 AM

Quote:

Originally Posted by Ed Wright

I hope you guys have an idea about this. When I let go of the trans brake button my car has begun to cut off & back on real quick. About a tenth off in 60' when it does it. Often only first pass of the day. I have tugged on wires, tightened grounds, replaced the trans brake solenoid, MSD box, crank trigger, disconnected the tach, etc. The battery voltage to the XFI ECU doesn't change when it does this. Two new NAPA batteries also. Only thing I wanted to replace last week was the microswitch on my Biondo button. Have a new on now. Going to test again Saturday. I would appreciate any ideas.
Thanks, Ed

The REAL solution to your problem is a Jerico transmission. That way you don't have to worry about a transbrake button going bad. LMAO!!!!!!!!!!!

Chad Rhodes · 03-24-2011, 11:41 AM

Quote:

Originally Posted by deuces wild

The REAL solution to your problem is a Jerico transmission. That way you don't have to worry about a transbrake button going bad. LMAO!!!!!!!!!!!

I like your style

Ed Wright · 03-24-2011, 12:47 PM

Quote:

Originally Posted by Chad Rhodes

I like your style

Big help there Chad. Big help. :-)

Adger Smith · 03-26-2011, 04:18 PM

I've spent all morning going over my car. I'm trying to get all those little things that never get fixed or looked at taken care of. Someone on here talked about a T-brake tripping at the wrong time. I got to looking at my switch and figured out I was having a similar problem. Last week my T-brake activated going up on the front end lift and going across the parking lot to load up and leave the alignment shop. You know, just a momentary thump/stumble type of apply. Well, best I can tell the little micro switch was set up in the button with partial travel already used up.
I could move the plunger less than .010 and the V/O meter would indicate a circuit. I think the odd /harsh vibrations of my little "V6" was shaking the switch enough to make a intermittent circuit. I took it all apart, moved the slope on the rod .040 and took the diameter of the rod where the switch roller rubs down to .340 depth. the switch lever starts to make contact @ .319. so I now have approx .045 travel in the plunger before the switch completes the circuit. (running SS I don't need the instant apply like a super class car) I also have the switch roller in a position where it is not touching anything when the switch is at rest. My thought there is no harmonics going through the switch lever. Well, I'll try to check it out next weekend. I think I'm going to find that thread and add my findings.
Ed, while I was reading this I thought of another issue that could be your problem.
If theses switches are all set up so close on the travel could the little spring in them cause a slight snap back when you release it? You know, like a valve bouncing on the seat. I always used a couple of shims on my switch and the spring seemed pretty soft so I tightened the spring up a couple of rounds. I figured I could take the shims out if it got too fast. Since it's been three years since I used a T-brake and I added a few B-days to myself I figure I've slowed down. :~) Good luck with it.

03-23-2011, 08:28 PM	#1
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 389 Times in 168 Posts	Help!! I hope you guys have an idea about this. When I let go of the trans brake button my car has begun to cut off & back on real quick. About a tenth off in 60' when it does it. Often only first pass of the day. I have tugged on wires, tightened grounds, replaced the trans brake solenoid, MSD box, crank trigger, disconnected the tach, etc. The battery voltage to the XFI ECU doesn't change when it does this. Two new NAPA batteries also. Only thing I wanted to replace last week was the microswitch on my Biondo button. Have a new on now. Going to test again Saturday. I would appreciate any ideas. Thanks, Ed __________________ Ed Wright 4156 SS/JA

03-23-2011, 09:15 PM	#2
Chad E532 Member Join Date: Jul 2008 Location: Lindstrom MN Posts: 156 Likes: 5 Liked 54 Times in 7 Posts	Re: Help!! Ed, Have a look at this product from Shogun. https://www.shogunindustries.com/cgi...ew_item=101003 It might be worth a call up there to see what their engineers have to say about your issue. Chad

03-23-2011, 09:52 PM	#3
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 389 Times in 168 Posts	Re: Help!! Chad, a couple of years ago I asked about that and was told it was illegal for SS. I have wondered about a simple capacitor to try to dampen posdible voltage spikes. Pete Peery says he has a microswitch not open cleanly so it was bumping the 2 step again. I waited too long last week to find another microswitch and the problem was still there at the track Sunday. New one on it now, just looking for more things to look at before I take it back out Sat. Thanks. __________________ Ed Wright 4156 SS/JA

03-23-2011, 10:07 PM	#4
Ken Etter Member Join Date: Nov 2001 Location: Riverside,Ca Posts: 111 Likes: 0 Liked 61 Times in 8 Posts	Re: Help!! I had an intermittant miss in my SS car. Drove me crazy,tried everything.Turns out it was the microswitch in the TB button. The vibrations would make it activate the 2 step. I replaced the switch and mounted the button on rubber to try to isolate vibrations. __________________ Ken Etter 7375 STK/5 SS

03-23-2011, 10:23 PM	#5
Myron Piatek VIP Member Join Date: Nov 2001 Location: Florida Posts: 1,538 Likes: 34 Liked 132 Times in 48 Posts	Re: Help!! If it's only on the first pass of the day, perhaps it could be something related to the carb/jetting/vacuum signal. It may be momentarily too lean because the engine isn't "heat soaked" from previous runs and bogging.

03-26-2011, 04:18 PM	#10
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,348 Likes: 434 Liked 677 Times in 261 Posts	Re: Help!! I've spent all morning going over my car. I'm trying to get all those little things that never get fixed or looked at taken care of. Someone on here talked about a T-brake tripping at the wrong time. I got to looking at my switch and figured out I was having a similar problem. Last week my T-brake activated going up on the front end lift and going across the parking lot to load up and leave the alignment shop. You know, just a momentary thump/stumble type of apply. Well, best I can tell the little micro switch was set up in the button with partial travel already used up. I could move the plunger less than .010 and the V/O meter would indicate a circuit. I think the odd /harsh vibrations of my little "V6" was shaking the switch enough to make a intermittent circuit. I took it all apart, moved the slope on the rod .040 and took the diameter of the rod where the switch roller rubs down to .340 depth. the switch lever starts to make contact @ .319. so I now have approx .045 travel in the plunger before the switch completes the circuit. (running SS I don't need the instant apply like a super class car) I also have the switch roller in a position where it is not touching anything when the switch is at rest. My thought there is no harmonics going through the switch lever. Well, I'll try to check it out next weekend. I think I'm going to find that thread and add my findings. Ed, while I was reading this I thought of another issue that could be your problem. If theses switches are all set up so close on the travel could the little spring in them cause a slight snap back when you release it? You know, like a valve bouncing on the seat. I always used a couple of shims on my switch and the spring seemed pretty soft so I tightened the spring up a couple of rounds. I figured I could take the shims out if it got too fast. Since it's been three years since I used a T-brake and I added a few B-days to myself I figure I've slowed down. :~) Good luck with it. __________________ Adger Smith (Former SS)