Hi Guys & Gals, i'm having some issues with my daily driver Aus-spec n/a auto and perhaps someone has had the same issues or knows where to start looking. Its a bit of an odd one so i will try to explain best i can. Zed runs great 75% of the time but has developed an odd problem of stalling at idle sometimes. My work is 30mins drive away with approx. 15 traffic lights or stopping points, and it usually conks out once or twice per trip but then starts fine afterwards, its always when i'm pulling up to a stop, lights etc. Also the idle changes every time i stop, sometimes its 900rpm, 700, 1500, etc. It doesn't hunt around looking for an idle point, its just different every time i stop. When its cold it has a bit of a hiccup upon acceleration but only in the 1st few minutes and then its right for the rest of the trip. The hiccup is as if it wants to conk out but i'm accelerating so it stumbles for a second then keeps going fine. I have changed the air & fuel filters, plugs, s2 ptu, cleaned connectors again, vac leak check. No codes coming up via ECU or via the auto trans diagnostics. No lights on dash or any other signs of obvious faults. I'm thinking it could be related to the air regulator or the Idle Air Actuator but they are a pain to get to, even worse than the TT lol. I have an ECUtalk cable and a multimeter if anyone knows what i should be testing, this is driving me bonkers. Regards, Grant.
Zed runs great 75% of the time but has developed an odd problem of stalling at idle sometimes. My work is 30mins drive away with approx. 15 traffic lights or stopping points, and it usually conks out once or twice per trip but then starts fine afterwards, its always when i'm pulling up to a stop, lights etc. Also the idle changes every time i stop, sometimes its 900rpm, 700, 1500, etc. It doesn't hunt around looking for an idle point, its just different every time i stop. Have you checked the AFM connections to make sure they are making a good connection? When its cold it has a bit of a hiccup upon acceleration but only in the 1st few minutes and then its right for the rest of the trip. The hiccup is as if it wants to conk out but i'm accelerating so it stumbles for a second then keeps going fine. It might be the gear box still not warmed up enough. Try letting your car warm up for 5 minutes before driving off and see if it fixes the problem. Mine is hesitent to change gears for a couple of minutes if I try and drive off straight away with a cold start. I just let it warm up before I take it for a spin now.
Check that the earth lead for the throttle position sensor is clean and tightly bolted down. It bolts on to the engine bay panel under the relay box. If it is loose, the idle can be erratic, and the car can stall.
My brother in law had a similar problem where his NA z would mysteriously stop a couple times per trip (often in a similar place). It would then restart again just fine. In his case it turned out to be a bit of paper towel or something that he'd accidentally left in the fuel tank when he had been wiping it clean.
Thanks Guys, gives me a few things to check that i hadn't thought of. I have a spare AFM so i'll change that too. I dont think it would be fuel tank related as i havent touched it, however it does stop in the same or similar spots so worth checkin it out, could be a build up of shit over the years. Also the last time i adjusted the TPS via ECUtalk cable, the voltage would flicker slightly (only 0.01V) but only after i pressed the accelerator, so could definitely be a bad earth there. Regards, Grant.
at the backi of the engine on the passenger side is the idle control solenoid starting from there follow the lines each way - check all the pipes for splits etc (infact I would suggest a complete vacuum system check) also check all the electrical connections and if you have the ability it may pay to pull all the units apart and make sure none are seizing or faulty.
Seconded, Idle control valve is not too hard to get to or too difficult to dismantle and clean, especially on an NA. Do it when the engine is cold and removing the battery gives you better access
