liKeiThil

I've taken my car to the shop twice, to find out that my ECU isn't telling two of my injectors to fire. Is this common with 2nd gen ECU's? well i Just installed another ECU this morning still having a rough idle; i resetted the ECU so am to believe: detached Battery cables, and depressed brake for minute. yet my idle still struggles: When i open either of my doors, Roll down either of my windows, turn my lights on, or when i depressed the brake. My idle is fine in neutral with the e-brake up and when my car is still warm'n up. I have no hesitation during accel. only during deccel, does car have hesitation when i release the gas in gear. Could it be my BAC? am i getting jerked around. alittle help or some sound advice thank you. . .

i have a 91 n/a.

YellowT2

iTrader: (1)

only two injectors are supposed to fire at idle and low RPM low load situations (these are the primaries). The other two injectors (the secondaries) only come on at higher RPM and load.

most common causes of bad idle are vacuum leaks and badly adjusted TPS

Turbonut

iTrader: (1)

First thing I would do is check the faullt codes if any. Then check out the BAC and TPS. Check BAC-@ idle remove wire connection, car idle should drop down. Conversely, with BAC connected, the idle should remain the same when a/c, or a load is placed on the engine. The idle may drop momentarily, but should climb back up. Check for internal seal leak inside the BAC. Blow into the air intake tube. Air should not pass the inner seal. If you remove the BAC, spray some WD 40 in the tube and see if it passes the seal. If it does, get a new/another BAC. Check TPS adjustment, not only by the 1k ohms, but after setting to 1k ohm, regardless of forum consensus, do the final check using the Mazda checker connection. If all set correctly check for any vacuum leaks.

liKeiThil

Thanks for the respond guys the ECU worked just had to let it adjust itself but both of your advice help'd aswell because their was a vacuum leak i was wondering what that hisssssssing sound was and the TPS needed adjustment.


Vacuum Hose's- $7.83
TPS adjustment - 15 mins
Your help- Priceless =)