Adjusting Idle

[Ktown]

? Is it possible to adjust the idle setting on the Lexus motor?? After working on the throttle linkage, I can either get full throttle or full idle (throttle body rotated to the back stop), but not both.? For some reason, the throttle arm does not move it enough to travel from back to front.? When running, I have noticed that the throttle doesn't actually start increasing RPM until at least an inch of travel.? Therefore, I set my linkage to attain WOT instead of "full idle."? However, now I have a boat that idles at around 1300-1450.? So, does anyone know how to adjust the idle setting or get more travel from the throttle arm?? ?

Thanks

[Capt Rick]

Disconnect the throttle cable. Start the engine if the engine goes to 1100 to 1400, then the engine is in fail safe mode. The engine light will go on. You need to repair what the computer says is wrong. If the engine starts and runs at 600- 800 rpm and you move the throttle body and the engine rpm move to wot 6400 rom in neutral then you have a throttle cable or Shifter control issue.

[Ktown]

Until I adjusted the cable to get to full throttle, the idle was in the 600-800 range.  After I adjusted to get more throttle, the idle went up to 1300-1450.  If I adjust so the arm is fully back (spring loaded position), I only get about 3/4 available throttle.  Actually, I only get 3/4 travel (compared to available movement of the throttle body) on the throttle cable period!  Also, the first 1/4 to 1/2 of travel of the cable (from true idle) seems to be forward idle (keeps about 1000 RPM). 

Thanks

[westtx]

Looks like you've found the cause for your low RPM issue

[wakejunky]

My SX is the same way. Before and after installing PP. messed with it all weekend. It seems like the cable doesnt have enough throw. Could someone verify if theirs actually has the full range? Is this maybe a problem with SX's from the factory with accuski? Or do all epics have this problem? Any help would be appreciated.

[Bitzco]

I don't have that problem on my SX but Marine Products installed PP for me.

[Capt Rick]

It is posssible the throttle cable is not connected  in the correct swivel pivot of the side shifter.  Also is neutral stright up. Try with engine off full reverse and see if it hits the min and w.o.t.

[Ktown]

Yes, the side shifter is straight up, when in neutral.  I will check rev this week sometime. 

Thanks

[wakejunky]

Excuse my dumb ass for not checking the archives. You lose 30% throttle throw with the PP bracket installed, per cyclone.

[Ktown]

wakejunky,?

I also have an SX and before I installed perfect pass, I had a problem getting full range on my boat (accuski servo was previously removed by last owner and had a non-standard cable attached to the throttle body).? Did you have accuski before PP?? My boat originally had accuski and perhaps the different set-up had a smaller throttle throw than others?? 30% seems like a lot, I thought the archives said they lost about 300 RPM?? 30% would be around 1800 RPM loss.? Anyone with a SX (that had accuski) getting full throttle throw (or close)? What we lose mechanically with the PP bracket, may be possible to get back at the shifter.

Does anyone have a manual diagram of the throttle linkage?? Specifically the rotating oval mechanism (sorry don't know the term) on the side shifter.? If we could change/extend the attachment point (similar to the PP bracket) on the shifter, it would possibly cancel the mechanical disadvantage of the PP bracket.? Anyone tried this?

[Ktown]

I found an old post and confirmed that we have a Teleflex CH2200 throttle.? Unfortunately the manual has a different cable connection kit (mine is almost heart shaped, see second link)! The manual is good for adjusting the throttle brake, but does not address adjusting cable throw.? Links below for those interested!

http://www.teleflexmarine.com/library/instructionmanuals/IS-CH2200_300.PDF

Here is a link to the TMS parts diagram of the throttle lever.? It's hard to decipher, but you can see the basic shape of the mechanism.

http://www.epicmarine.com/figures/Fig_16.php

[Ktown]

Case solved.  As posted in the "top speed" discussion, I found the problem with my boat.  Turns out one lousy loose connection caused my whole problem.  The throttle throw is more than sufficeint.  See the "top speed" post for more info.