Strange idle issue
 

Hey all i hope everyone is well and so are your cars unlike mine

Ive got a S5 turbo, ive got this strange idle problem now ive read the previous threads but this one is really unique, i was driving along and my car started to miss well on boost, so i pulled over and notice a serverly eractic idle, then i drove home and its stop missing on boost. i decided to check the plugs and clean them then started it up no change, i adjusted the idle screw and it picked up the idle but was missing. Now the turbo timer keeps telling me the battery is low, thats most likely because its idle is way to low and the altenator is having trouble keeping up. I took it for a decent drive and it still hasnt straightened out, however it idles like crap which is at at about 500rpm but doesnt miss on boost very strange, bascially it misses under 2000rpm and the aircon brings the idle back up but doesnt fix the missing. Ive checked for air leaks in the inlet and intake and no luck.
Oh and the plugs im running heat wise are 9 for the top and 7 for the bottom too cold??? please advise

If anyones got any ideas i would appreciate it
thanks.

Sounds like the TPS is out of alignment. Re-calibrate the TPS to the throttle body and you should be fine

Is the tps adjustable? how do you recalibrate it?

This is a link for the S4 setting, but the S5 is simular:
http://fc3spro.com/TECH/HOWTO/TPS/tps.html

awesome thanks!

9 on top 7 on bottom is fine. im thinking maybe your not getting full voltage to the fuel pump. My car has been acting strange lately idling at 500 and barely pushing and is hella lagging on acceleration. I checked the fuel pump and the wiring was loose, and the hose from the sending unit to the fuel pump was ripped.

Hey guys thanks for the help i will go adjust the TPS and check the fuel pump connections and get back to ya

cheers!!!!!!!

Good news and Bad
 

Hey !!!

Hey Icemark i adjusted the TPS back to 1k ohms and it kinda made it worse, it was sitting on 1.2 ohms orginally and when i went to adjust the BCV it would stall after starting, Good news is the fuel pump has nothing to do with it. Do u think cleaning the plugs wasnt enough so maybe i should purchase some new ones or could it be the coils, Thanks for the help man if you have any more ideas please let me know.

Cheers!

Do the final setting with the 3 prong green connector, engine hot, or cold with the fast idle held up with screwdriver, and key on . Use lights, or voltmeter to check each combination. No voltage in either, or voltage in both, TPS needs adjustment. Must have voltage in only one combination. That TPS, is at times, can be very frustrating. It can appear to be set properly, good continuity throughout and no blips, then a hiccup in performance. Check settings and it's off again slightly. Just went through this with mine. Everthing checked out, setting perfect, but after a short time the engine would "kick back" under boost, almost like detonation, and idle rough as ecu wasn't receiving the correct signal. Finally got fed up and installed the brand new Mazda TPS that's been sitting in the garage for 3 years. No more problems since installation.

Cheers dude

Hey all howsit going?

I finally managed to get my car to RX7 Heaven, the news i got wasnt what i expected. :mad:
Ive managed to chip the apex seal on the rear housing, so it looks like a rebuild time, just thought id let you know, anyway cheers for setting me in the right direction i appreciate it. This forum is so helpful thanks to its many members its rules!!!!!!!!!!

Hopefully it wont be long before she's back on the road. :D