Is there any negative affects to removing the dashpot? I know alot of people do it. I think its malfunctioning and making my TPS impossible to adjust. Plus my idle is never the same whenever I release the gas pedal.

Thanks in advance!

Jarrett

 

strange coincidences:

i have a 10AE
i have the same problem you have.

i was thinking maybe the dashpot is just screwed in too much (to where it pushes the throttle)

i may adjust (or just remove) the dashpot tomorrow...tell you how it goes.

 

I think I'd just back it off and see if that's the real problem. If it does not help, you might try spraying a liberal amount of some spray lubricant on the linkage and exercising it a lot.

 

Yeah, its getting annoying, I am trying to find the source of the constant changing in idle. I have adjusted the TPS and idle so many times now.. Its not that the car doesnt run good, its just that I would like it to run like its supposed too. Right now I see idle speeds from 1500 to 500 in no particular order or reason..

Jarrett

 

my theory is that:

the dashpot is pushing the throttle open. so when you use the idle adjust screw to lower it, you end up shutting the plates, caushing the shitty idle, that in turn ***** with the TPS. ill probably just back the dashpot off a bit, rather than removing it...im sure theres gonna be some major stumbling/hesitations frmo the plates just SHUTTING like that.

 

Well, it seems the linkage is returning to different places each time. That's the only real explanation for the tps varying all the time. Say your set your tps using the voltage method, and set it at one volt. Then later you looked at it and it said 1.60 volts or 0.60 volts. That would have to be in the linkage, because you already checked to make sure the tps screws are tight(ones that hold it on).

I meant linkage or dashpot, which ever. Or its hanging on something.

I hate picking on the bac, but I had my one and only bac problem on my turbo, when for some strange reason it decided to stick open a little bit and give me a 1000rpm idle. So on a outside chance, you might warm the engine up, and the next time it gives a high 1000rpm idle, disconnect the bac plug and see if the idle drops. Maybe just tap it gently also.

NO WD-40 allowed on the linkage. Verboten. Niemals!

Then there's a thought that it might be a stuck valve somewhere. Like in that turbo inlet duct. *blowoff valve* (forgot the real name).

Actually I like the idea of looking at the output of the tps to see if it's a mechanical problem with the throttle linkage or something like a intermittent vacuum leak. If the reading is generally the same, like 1volt plus or minus say 0.05, then its not linkage that troubles you. I use a wire tap at the ECU to look at this (time you get the intercooler off it'll change on you.) With a wire tap you can look right at the reading with the car running and you tapping the throttle with your foot.

 

Or you can pull the intercooler with a hot engine, and look at the throttle stop screw (8mm nut on a small screw on the aft end of the throttle body)and see if when you release the throttle, does the throttle stop screw meet the linkage each time.

You can buy some pvc pipe, with elbows, and leave the intercooler off. That way you can see and make adjustments while running the engine. Been there and done that. Plug the pvc into the turbo outlet hose and the throttle body inlet hose (gee, who'da thought).

Maybe I can come up with some more screwball ideas.Later.

 

I have some small diameter aluminum dryer exhaust tube that works pretty good to by pass the intercooler, I have been having the same problem and have been running around with my BAC unpluged , I just plugged it back in and tried to get a steady 800-820 idle, because when eltric fan turn on the idle usally drops 20 to 40 rpms , I just set my TPS with that volt method you are talking about with my intercooler bypass inplace and pluged the BAC back in, I have been driving it around and it has not gone above 950 yet, though when I start it up I must give it gas cause it takes a while for the idle to come up from 600 to 750 or 850....and I am still having bad Cold start problems, if my car is sitting over night and its 50 or below I must blip the throttle on and off, starting it up over and over cause it keeps dieing, I have looked at my water thermowax and when the engine is warm it is touching the fast idle cam, I can't tell if the fast idle cam is correctly adjusted as I didn't look at it when my intake mani was off....I may just get a mirror and look at it....I'll post the happenings of my car tommorrow after I driv to school and back.....

 

why no WD40 on the linkages? what does it do?

 

It dries out very quickly..I would use lithium based grease if I was going to do that.

 

You really shouldn't ditch the dashpot - it is there for a good reason. Without the dashpot, it's common for the engine to stall when you push in the clutch.

Probably better to pull the throttle body and do a thorough cleaning and adjustment.

Dale

 

I had mine off of the N/A, and it didnt seem to affect the running of the car. But what I am concerned about is if removing the dashpot would be detrimental to the compressor (i.e. compressor surge).

Jarrett

 

Dashpot has nothing to do with the turbo...really.&nbsp The dashpot's only function is to dampen the abrupt throttle closed when you suddenly lift off the gas pedal.&nbsp Adjusted correctly, the dashpot shouldn't be intefering with normal operation of the throttle body.&nbsp Via the Mazda FSM, the dashpot should contact the rotating throttle right before it's in the full closed position.&nbsp I agree with dcfc3s - you should try and keep it if possible, as it enhances driveability.&nbsp There is no downsides if it's working and adjust properly.


-Ted

 

fixed my idle problem.

all i did was follow the FSM procedures for adjusting idle, and poof, problem went away. will give another update in a day or so to see if it completely went away.

car is now holding a 750rpm idle.

 

COOL! Maybe I am doing something wrong when I adjust my idle. I am gonna go through the steps again, with the FSM next to me....

I dont really want to remove the dashpot if I dont have to.

Jarrett