Noodlebut

Hi, recently my car had been running very bad at idle... the gauge was reading approx 200rpm at idle and car sounded like as if it was about to stall sometimes... so i decided to take off the dynamic chamber + TB and clean them out. i done that yesterday.

today when i started it it was all good, but on my way to work i noticed that the idle stayed at about 1300rpm, this is after i set the idle through the BAC valve to about 800rpm. When i noticed that it stayed high, at the lights i pulled up the handbrake and let the clutch out abit so as to let the revs drop but not stall... then i put it back in and found that the idle dropped and stayed at 800rpm.
and it just keeps repeating... after driving it stays at 1300rpm... and sometimes it will go back down to 800rpm...

could this be the TPS sensors? .. i checked their resistance and they seemed to be ok. according to the manual...

although it may not be related, something i just noticed was when at a stop i was reving it to 5000rpm+ and then let it drop to idle, it sounded rough for about 5 sec then went back to normal. there was something like "pops" coming out the exhaust but after a few seconds went back to a nice purr and a "pop" every now and then

cheers.

SureShot

Some possible causes:

Dirty/sticking BAC.
BAC connector problem.
Throttle linkage/shafts sticking near idle - not always closing completely.
A crack/leak in the TID.

Turbonut

iTrader: (1)

Check the BAC inner seal for leakage. Remove BAC and either blow through the air inlet tube, or spray some WD40 into the tube to see if inner seal is operating properly. If air or lube goes past the seal get a new BAC.
Also on the TPS make certain it's set properly after warmup. Set 1K ohm then set via Mazda checker. You'll find that 1K ohm only a good starting point, but in my experience I've found it needs to be fine tuned using the Mazda checker. Too many problems leaving the setting at 1k Ohms.

powrdby13B

BAC? Cold start system? I'd do the TB mod and see what happens.
And did you port your intake when you took it off?
How's your AFM doing? Do you have a stock filter?

Cybaster

EXACTLY what my car is doing..... i check the tension of the throttle cable.....
didn't check by BAC yet, but this is EXACTLY what my car is doing.......
someone help us...

SonicRaT

iTrader: (6)

Usually caused by a BAC that seals completely sometimes, and then others doesn't seal completely. Take it off and clean it thouroghly (I just soaked mine in a parts cleaner bucket overnight), and it fixed my problems right up.

Versatile

Sorta a newb. How do you adjust the BAC?
I replaced my whole engine harness and put everything back together, now when I start my car, my engine idles very rough and died when I drove it around the block once. Sometimes it doesnt even start. What could be my problem? When I first started it, it didnt cold start and idled at about 750, but pretty rough, the whole car vibrated. Can somebody help?

Versatile

bump

Noodlebut

is there a gasket or seal i need to buy from mazda to replace it if i take off the BAC?

also how can i get one of those checkers? you mean the checker lamp right? can i buy it from mazda?

Cybaster

http://www.teamfc3s.org/info/article...odes/main.html

man... that was a long search.... =P next time do your own =D

https://www.rx7club.com/showthread.p...ght=BAC+gasket

people use Black or Blue RTV gasket maker