Throttle problem... Request for more help...

[liddown]

The best part of installing the ColdSide is that your ready to tackle the minor tweaks that each car will need… Thanks Steve!

I have been fighting a problem with what I thought was idle hang, however after some spirited driving the problem got worse and worse with the heat… Well as it turns out this looks like a two fold problem, with the first one being solved after reading most every post on the board ;-) The throttle cable bracket rotated down and was rubbing on the cable track, so I see that it is suggested that you should create an “L” bracket to make sure that does not happen any more. Ok got that….

However here is where I really need help PLEASE… So what is happening is that the throttle butterfly is not always completely closing… I would get the idle hanging at 2K RPM, if I pulled over, and opened the hood, I could push on the throttle down with my thumb it would close a very small amount with a click, bringing the idle to normal. After thinking that the throttle cable was the problem and playing with it for an hour, it turns out that the butterfly seems to have some “slop” in it. If I grab the round cable track rotate the throttle open a bit I can push and or pull it back and forth about a 1/8 of an inch or more. I am finding that if the butterfly is pulled a bit toward the passenger side it will bind and will not always completely close causing a very fast idle as it is “stuck” open. Pulling the pedal does not help as there is plenty of slack in the cable for the butterfly to easily close. Only way to close it is with the trusty thumb.

Can someone please look at theirs to see if your does the same? The spring on these throttles seems very light compared to the OEM throttle and mine will not close every time even if there is obvious slack in the cable…. But I doubt that I should have side to side slop… Anyway to tighten these to take the slop out…

Thanks….

[Kyp J]

Re butterfly sticking: I didn't have that kind of problem but I read about a couple. I seem to remember there might have been some interference related to the TPS or maybe that was a suggestion at the time. Did you try loosening the TPS assembly to see if it released the bind? Since mine was one of the first of the BRP versions, there may be different parts used now.

Re the throttle cable pulley assembly, I put extra screws in some of the unused holes to prevent rotation. I think I had to do a bit of grinding to get clearance for the screws on the bracket. They don't go through the bracket, just against the edge above and below the "pivot" screw hole.

[Tom @ Fast Forward]

If it is a 99-05 kit and recently shipped, it could have a problem with the TOS adaptor. The center hole needs to be opened up a few thousanths. If I was home, I would just ship you another one. However, I am a long way from there. Vacations do that. :) If you remove the TPS adaptor and run a 7/16 drill through it, that will cure the problem. Check first as I am going from memory but I believe 7/16 is the next size up from the current hole.

[liddown]

Hope your enjoying your vacation Tom! ;-)

Ok a little more clarification.. Yes I just installed the kit and it was shipped in May. The TPS is mounted directly to the TB. The TB has a flat blade black tip that sticks out the side that engages with the TPS, and the TPS mounts directly to the TB with two screws, the electrical connector on the TPS points down 45 degress toward the firewall. Can you help me understand what the TOS is (type-o for TPS I know your typing and driving), and what hole are we drilling, the one the black flat blade sticks out of? Also what is the TPS adapter, the blake flat blade itself?

Sorry for the education but I promise to share my new found wisdom with any newbies like me....

[bambam]

Hope your enjoying your vacation Tom! ;-)

Ok a little more clarification.. Yes I just installed the kit and it was shipped in May. The TPS is mounted directly to the TB. The TB has a flat blade black tip that sticks out the side that engages with the TPS, and the TPS mounts directly to the TB with two screws, the electrical connector on the TPS points down 45 degress toward the firewall. Can you help me understand what the TOS is (type-o for TPS I know your typing and driving), and what hole are we drilling, the one the black flat blade sticks out of? Also what is the TPS adapter, the blake flat blade itself?

Sorry for the education but I promise to share my new found wisdom with any newbies like me....

I had the same problem I think. The TPS bolts on to the aluminum adapter plate using two 4mm small bolts, yes there on the other side of the throttle.

The hole in the adapter plate itself needs to be englarged just a tiny bit. One way to confirm this is to do what Kyp suggest and that is loosen both of those 4 mm bolts enough to give it some ease... and then see if it is still sticking. I betcha a plate of fried chicken gizzards that its the TPS adapter plate hole not being big enough. I loosened the two bolts allot and the sticking stopped. Tom sent me another one as I did not have a drill press.

I hope that is what it is, and only thing it could be. I mean you can take your throttle body off and snap it open and see if it slams shut but I am sure that it does.

I am like you, I welcomed the little bugs at first as I had an opportunity to learn.

Buck

[liddown]

Thanks Buck-O! My mama was from Temple so how about we make it a plate of Black Eyed Peas!

Help me understand what you mean by an adapter plate? My TPS mounts directly to the aluminum throttle body, I am missing what the adapter plate is. To drill a hole in something are we talking about pulling the throttle body, removing the black flat blade element that is connected to the butterly and drilling out that hole?

I am feeling slow today....

[Tom @ Fast Forward]

Sorry. TOS should have been TPS. It is hard to thpe on my little PDA at 75 MPH with my wife yelling 'watch the road'. ;)

There is an adaptor mounted to the BTB that the TPS mounts to. If you remove two small (4mm) screws it will come off. It uses a 3mm allen key. The main hole through that part is the hole the small roun piece goes that you mentioned with the blade. Open that hole. You can hold it in a vice and use a hand drill as the current hole is big enough to guide the drill.

Now back to eyes on the road.

[99mx5]

Sorry. TOS should have been TPS. It is hard to thpe on my little PDA at 75 MPH with my wife yelling 'watch the road'. ;)

Maybe you should switch seats ;) go Kat go!!!!!

[Tom @ Fast Forward]

Then I would be too scared to type. ;-)

[liddown]

Nope its not a date it's a size!!!

I am cured!! The 7/16 hole was the complete fix, was also able to get that dang EGR tube out and drilled open also.... It's been a good day in the garage. Thanks All!!! I didn't realize that there was an adapter plate, I thought that fitting was just a part of the TB.... Handy to have a drill press...

[Scuba Steve]

Nope its not a date it's a size!!!

I am cured!! The 7/16 hole was the complete fix, was also able to get that dang EGR tube out and drilled open also.... It's been a good day in the garage. Thanks All!!! I didn't realize that there was an adapter plate, I thought that fitting was just a part of the TB.... Handy to have a drill press...

Glad to hear it worked out, when are we going back to the dyno :party:

If you decide to get an LC-1, we should plan a weekend to install them on both cars.

[Tom @ Fast Forward]

I hate it when problems occur but love it when a simple fix makes it go away.. ;-)

[BlownMX5]

Hey Liddown, or anyone else...

Did the sticking problem worsen with heat? Mine sticks when it gets hot, the hotter it gets, the worse it sticks. Mine is from a BRP kit and it's a MAC TB. Does mine have the same TPS adapter? If it does, I am so running a drill through that puppy.

Pat.

[liddown]

My was for sure impacted by heat... The longer I ran the worse it got... The TPS adapter I drilled out was supplied by Tom and I believe is a custom FFS part. So I am not sure if you have the same adapter. A good way to tell if you have the problem is when you have the hang, pull over, open the hood, and see if you can close the throttle with your thumb... Also check that the arm holding the throttle cable is not interfering with the rotation of the throttle.... I have no experience with the BRP stuff, so I could be all wet here.....

[Tom @ Fast Forward]

the BRP is significantly different and the MAC is totally different as well. Drilling probably wont help.

[BlownMX5]

OK, so will the TPS adapter I have work on any TB? The reason I ask is because rather than getting a BBK, I'd rather get an Accufab (http://www.accufabracing.com/mustang_gt.htm) TB. The BBK 1701 is $215 at Summit and the Accufab is only about $25 more. You'd think that all Mustang 4.6l 2V TBs would have the same TPS mount. The guy that works on my Cobra says theirs are the best made.

[Tom @ Fast Forward]

I thought the same thing. However, I know the BBK & MAC are different. Don't know about the third brand?