for those of you who have seen my many posts about my horrible idle problems, i have some great news ....


i tightend up the throttle cable a we bit, and BAM!!

idles below 1000 now ... which means its time to set the timing, and make my rex my daily driver again!!

the cable adjustment also helped my car dying when dropping from high revs .. i thought it was the dashpot, but the cable just had too much slack in it ... and it would die unless i blipped the gas ...

whats weak though is when im finally able to set my timing, the timing gun stops working ... figures ..

BUT whatever .... the major troubles are over ......!!!

so thanks to everyone whos helped in the past, and i wish i could say this will be my last major issue, causing me to annoy everyone with questions,

but we all know that will never happen!!

time to go drive my car somemore ..

 

Good job man, Its always exciting to get our cars to idle correctly! (i know, its sad ) - but good job!

 

Good job! It took me 3 months to get an idle below 1k. I finaly got it stabilized though! Goodjob. You got lucky, glad it worked out in the end.

 

its almost enough to **** you off though ... lol... car down for about 2 months now cause of the stupid throttle cable being a tad bit too long .... oh well .. atleast it WAS something simple

its still not a perfect idle ... the tps is kinda shot or going fast , cause i have to adjust it often .... but atleast i can keep it idle below 1000 with lights on, AC on full blast, radio on , and breaks pressed in

GLORY!!!

 

You have the BAC installed?

 

NOPE!!



no emissions or any of that stuff

im sure if i had the BAC it would be a better idle, but damnit it runs, and as soon as the timing is in check it will be running real good

 

Exactly how loose was your throttle cable before??

 

not too much at all .. i just noticed a bit too much slack from where it connects on the back of the manifold to the actual linkage swing thing it connects too ...

so i just tightend it up a tab bit , and my troubles were over ....
i spent about an hour after that tweaking the timing by ear, and adjusting the idle screw and TPS, .... i still got some adjustments to make (with an actual timing light) but its coming together quite nicely ...

 

What is BAC and TPS?

 

BAC = Bypass Air Control Valve.... adjusts idle for ac, ps, etc.


TPS = Throttle Position Sensor

 

I'm trying this tomorrow. If it works I owe you a coke. My car has not been able to hold an idle since I bought it and i've replaced every damn vacuum line in the car.

 

You know, I hate to rain on your parade, but this wasn't the way that the problem should have been fixed. Sounds like your idle was just set too low, especially without assist from the BAC since it was removed. By tightening the throttle cable a hair, you're actually holding the throttle plates open a bit. But you know what? You have a THROTTLE PLATE STOP SCREW permanently mounted to the TB that exists in the world for that sole purpose. You turn that screw, and it holds the plates open more or less, thus raising or lowering idle.

Now, you went about it a different way, and that's fine. Just so you know, over a period of time, the throttle cable adjustment will change, and you may either get a high idle, or a low idle, but it could be inconsistent...the throttle cable is not meant to hold the throttle open. There is SUPPOSED to be slack in it...not a lot, but it isn't supposed to hold the throttle open at all times. That's what the stop screw adjustment is for. IT is meant as a permanent, consistent stop, where the throttle cable will flex and stretch over time, allowing the idle to change...that adjustment with the locknut on it, once set, will not change.

My advice would be go adjust teh throttle stop screw properly, and back off the throttle cable to have just a little slack in it. You don't want so much that there is slack in the accelerator, but you don't want it to constantly have pressure on it, either.

FYI, the throttle stop screw is under the intercooler, on the backside of the TB, top corner, facing the passenger side. IT is an 8mm locknut with a small flathead setscrew inside...you loosen the nut and turn the screw (which is the adjustment, in for high idle, out for low) and then lock it back in place with the nut.

IT is good to hear that you found your problem, though. Have fun with the car.

 

so was this actually the problem with the idle or is it just masking the idle problem by holding the throttle open?

 

They both do the same thing, in the short term. But one is meant to do the job of holding a permanent idle position, one is not (throttle cable). I used to think the throttle cable was a quick, cheap way to adjust idle. I quickly learned this wasnt the best way, because its inconsistent...


As for WHY it was necessary to adjust idle at all, anytime you remove the bac valve or any other equipment from the engine, you usually have to readjust idle. Hell, even when you adjust timing, or the tps, you need to readjust idle.

 

ive used the idle set screw (held in place by the 8MM nut) in conjunction with the throttle cable ..

the throttle cable was the LAST thing i messed with ... trust me ..
i adjusted and readjusted just about everything else ...
then yesterday i noticed that it was loose from the connection on the back of the manifold to the actual swing thing on the TB ... adjusted that and all of a sudden i was able to go under 1000
like i said earlier my idle isnt perfect yet .. it is a bit high, so it still needs some tweaking .... by way of the idle set screw, but i just wanted to make sure you know the idle screw was one of the things i was tweaking with no avail ..
i could get the idle the lowest at about 1000 ... NO LESS ... anyless and it would stall ...
now that i have the throttle cable just SLIGHTLY tightend, i was able to use the screw to get it below 1000, and it doesnt die when shifting from high revs back to neutral (which i origianlly thought was the dashpot)
like ive said its not perfect, but it will be going strong soon ...

kevin ... see you whenever we have a REAL TN meet! ... hopefully a tuning session

 

Well, that makes no sense, as both of them do the same thing...hold the throttle plates open. Just one is a more permanent/consistent method. Whatever works, I guess. Have fun with the car now.

 

is there a difference in length between from the manifold to the TB between series ...
since i have a series 4 car (aka s4 cable) and s5 jspec UIM maybe that could be it?

dont know ... hell .. dont really care .. IM ABLE TO DRIVE MY RX-7 AGAIN!!