thegemini

Rich Lean screw location??

thegemini

I cannot find how to adjust my mixture, a tech at a shop said he would lean it out for me to pass emissions. I have no clue where the IDLE screw is. Please Help I cant drive like this and dont want to damage my engine. The car will die at idle after start up. I need the location, Its a 89-91 so I dont want people to think its the same as 86-88.

thegemini

I cant belive no one can help me on this, Ive serch every where on here and google and 3 other forums

Icemark

You don't want to mess with it ever, unless you have done everything else first to lower emissions.

It is pre-set for your motor in your car.

What is the actual problem???

and why did you start multiple threads on this??? Threads merged. ONLY one thread per subject per member.

thegemini

A tech did it to help me pass emissions, he said he leaned it out? Then he siad if it gets the shakes just turn the idle up. Im kinda fucked because they arent open today and I have a interview tomorrow and it will cut off when idle. Not getting enough gas. I need to be put in the right direction, sorry about start serveral threads but I need help bad

Icemark

idle and mixture adjustements are two entirely different things

which one was it???

and I wouldn't drive the car if he has adjusted the mixture, until it is fixed. If he just cranked it down to pass emissions you probably are running so lean that the least bit of warm weather or poor gas will lead to detonation, or a serious lack of lubrication- both of which lead to blowing the motor.

Remember the reason a Rotary runs richer at higher RPMs is to use fuel to help lubricate.

You never ever ever want to mess with the mixture unless you have exahust temp or a wideband to check the actual ratio.

t90man

it's a little black dial looking thing in at the engine side of the passenger headlight, look down in there
i wouldn't 'screw' with it too much though, apparantly it's better to leave it to factory spec

thegemini

He just told me he made it leaner, He was not a RX& tech, just a emissions GUY. It will not IDLE its cuts off, does that sound like its lean or the idle is turned down.

Icemark

He shouldn't have fucked with it. You should have fixed the car before bringing it too him.

There are two seperate adjustments for idle and for mixture. You need to figure out what he did, to be able to fix it.

You can mess with either, but the wrong adjustment will just make everything worse. If you are unable to figure out what he did, you will need to read the FSM (there are links to the S5 factory service manual found in the FAQ for FC sticky thread at the top of this section), and following the FSM reset everything back to spec.

The absolute last thing you want to do is to just start messing with either the idle or mixture screws by just turning them and not knowing what you are doing. They call the idle adjustement screw the $1000 screw, as for some techs it is easier to put a new throttle body in, than adjust the idle speed.

thegemini

dam this sucks, I put on a new cat and failed the test, the car was running perfect and it idled fine. I will read the section, thanks

Icemark

just download the FSM and reset everything.

and the emissions section of the FAQ for FC will tell you what to fix if your not passing.

thegemini

thanks, I just realized that on the drivers side of the mainfold he pulled off a hose and had alittle valve thing bleeding out air, I just put the hose back on and its idiling normal with the TB top adjustments. Looks like he put the valve on there and turned up the air going into the TB

I can get a year waiver to register the car, then after that Im not screwing with AZ laws Im going to register it out of state. Thanks for your help guys

Pilx

I have always thought that S5's didnt have a mixture screw and that it was only in S4's?

So S5's do have a mixture screw after all? (btw mines a jap import if that makes a difference)

sar

iTrader: (1)

Surprised we didn't notice that, right s5s, 89-91s do not have idle mixture adjust screws.


It sounds like the guy removed a vacuum line from the emissions and engine management equipment which would cause your car to not know much about how it is running or how to maintain idle with the bac. This tester should not have done this and should def not have left it like this. Did you get your blower hooked up to your new cat and is your new cat made specifically for an rx-7 or is it a generic weld on? Without the air the cat won't have oxygen to burn the mixture. Without a specific cat the higher temps of the rotary will destroy mr. generic weld on cat.