notveryhappyjack

iTrader: (4)

really really really do need advice and help

my car will only idle at 4,000rpm

what can I do to fix this? where do I start ? what to adjust ?

I have been buying and collecting parts and building this car for 19 months, everything is assembled, when i turn the key the motor goes straight for 4k RPMs, I have not a clue how to fix this and have no way to properly time it at this engine speed?

someone has to know something, come on i need your advice

notveryhappyjack

iTrader: (4)

ecu=powerfc w/commander
intake= fd upper intake manifold w/throttle body, spacer/adapter to use s5 lower intake mani

MazdaSpeedDan

iTrader: (4)

Throtle Position Sensor.

MazdaSpeedDan

iTrader: (4)

My hard drive crashed so I lost all my bookmarks but this should help you out.

This was the issue for my horrible idle (2k idle and sticking at 4k)

http://www.fd3s.net/tps_adjustment.html

EDIT

Here is the one that I was looking for. Great page.

http://www.rx7.org/Robinette/tps_adj.htm

MazdaSpeedDan

iTrader: (4)

I flipped my TPS the other way and mine idles like a champ right now.

arghx

iTrader: (3)

Verify no vacuum leaks

notveryhappyjack

iTrader: (4)

i don't think i have any vaccum leaks. I'm not going to spray carb cleaner anywhere near my engine so unless you have another way lets move on to the Throttle Position Sensor and how i can get it to work

so lost, pics of the set up

notveryhappyjack

iTrader: (4)

when i uplug the TPS this is what the pfc reads

MazdaSpeedDan

iTrader: (4)

Do this, Unplug the TPS and see how it idles. With mine unplugged it would jump around but wouldnt die unless the throttle was opened.

So unplug it and see if it still continues to jump to 4k.
Nice setup BTW

MazdaSpeedDan

iTrader: (4)

Also your throttle cable is not attatched. ;-)

RotaryEvolution

iTrader: (30)

never paid attention but the TPS is facing the wrong direction, which i suppose could be binding the linkage.

notveryhappyjack

iTrader: (4)

thanks you two for the advice, I called it a night for today. Tomorrow I will get up and give it another shot, I will try to start this beast without the TPS on and post what is the result. ps I un-connected the throttle cable because at first I thought the cable was causing tension which caused the car to idle so high. Now i know this isnt that case.

MazdaSpeedDan

iTrader: (4)

The TPS is fine that way, thats how mine is and mine idles correctly now.

loosen the 2 bolts holding the tps in and move it around a bit and see if it effects your idle, if it does, get a multimeter and start adjusting it like the webpages I posted say. GL

MazdaSpeedDan

iTrader: (4)

Also DONT over tourqe the bolts holding the TPS in, they dont need to be tourqed to much to have a good hold, they will snap off in there. Also the TPS is pretty brittle so when you are adjusting it dont have hulk hands and try to force it or it will break.

RotaryEvolution

iTrader: (30)

i doubt it's the TPS adjustment itself, since all the idle control solenoids have been removed. if it was around 3k or less i might see it as a possibility but not for an engine creeping up to 5k without any throttle input. large vacuum leak or hung up throttle arms.

notveryhappyjack

iTrader: (4)

so to check the hung throttle arms? not framiler with that term, is there a piece i need to lubricate if its stuck?

and to use the multimeter ? how does that tool work ?

tafkamb2

TPS adjustment And for the throttle arms take off your "elbow" attached to the throttle body and move the throttle by hand and see how the butterfly valves move.

notveryhappyjack

iTrader: (4)

anyone ?

RotaryEvolution

iTrader: (30)

did you follow the test procedure in the link above?

notveryhappyjack

iTrader: (4)

no offense, I don't know how to use a multimeter volt reader properly so that link is very hard for me to understand, trying to figure it out. the scale it reads on is confuesing as well as the process which you test it

arghx

iTrader: (3)

pull the PFC commander into the engine bay and adjust it using that. VTA1 is narrow range voltage and VTA2 is full range voltage. no multimeter needed.

you really should learn how to use one though

RotaryEvolution

iTrader: (30)

but the TPS is reading 0 volts while connected, i don't believe that is possible unless the TPS is installed incorrectly, the 5 volt reference driver is dying or grounding out somewhere or the ground circuit is failing to the sensor.

in any case, i suppose twisting the TPS while reading the hand controller may give an idea to ruling out some of that. beyond that you'll have to find a manual for a DVOM, just about any non scaling DVOM manual will give you the basics on how to read it. it's too time consuming for me to write it all out. but to get you started, hook up the black lead to the negative battery terminal, red lead to the wire you're reading. turn the DVOM switch on or turn the dial to DCV(direct current volts) and scale to 10/12/20(different DVOMs use a different scale for 2 digit volts).

notveryhappyjack

iTrader: (4)

Afghx I will read up on how to operate one of these DVOM tools. Thanks for the head start on understanding, now all i need to figure out is the scale which it displays in and what that means.

Karack I will flip the TPS to aim the other way and try it out, I cannot imagine that this is the issue because it worked flawlessly in this position for 25k miles on the previous motor.

One thing that has been changed since last time it ran was
I removed 100% of the stuff from the engine bay, cleaned everything, then painted the whole bay. Maybe the TPS ground is not grounded properly? does this sound reasonable ?

thx for the advice