denElias

Hi guys,

I just installed a turbo on my 1.6 stock internals
specs:
Bosch EV14 640cc injectors
stock coils, ngk-4091 spark plugs
gt2554r turbo
stock fuel pump

Now i have this weird problem that i can't get my car to idle stable above 12 afr.
If I remove any more fuel, the idle starts hunting like crazy and the car eventually dies.
The rest of the fuel map is perfect, the car drives very well in all areas.
I changed the requered fuel and injector dead times to the correct values.

Any more suggestions?

Thanks in advance,

adryargument

iTrader: (1)

was it running on ms before fine? at warm temps or cold?
maybe try re calibrate sensor first
adjust the airflow screw on tb

thats how i got my ms3 off to a good idle initially before diving into idle.

denElias

I already had the ms3 for a year or so. Tuned it for my stock 1.6 and it was running very well.
Now with the new injectors, i needed to change the fuel map a bit, but not by a large margin.

I do run on open loop.

der_vierte

Do you have a log, when it does that?

VE table looks fine, spark map looks horrible (but idle cells are fine), why are you on open loop idle? General settings look okay, but I want to see that log.
Maybe you can turn off EGO and overrun fuel cut, just to be sure it isn't doing something stupid.

denElias

Thank you for the input.
I can provide a log tomorrow.

I like to dial in idle in open loop mode, then change to closed loop.

Why do you think my sparkmap is horrible? Is it on the unsafe part of horrible?

Kind regards,

der_vierte

Is your map dyno tuned? I think for pump gas it's hot, especially low/midrange and transitioning into boost. You're 5-7° up on me and I'm on 8.8 pistons and run 102 octane ROZ fuel.
If the car hasn't been on the dyno or checked with other knock control, I would pull some timing, better be on the conservative side...

I would pull the IACV plug and set idle with the screw to something like 700-750rpm, then go on

denElias

Ok I corrected the spark (didn't change idle)
Now i made 2 logs both with the IACV disconnected
The first one is the car running normal at 800 rpm with 12 AFR
The second one I start lowering the fuel, and the idle starts hunting. So I think the ECU is still doing something.

My fuel map is pretty normal, I don't think I need to lower the fuel amount, yet still my idle is very rich.

Thank you in advance

denElias

Hi guys,

After months, I finally found the solution to my problem.
Because I have an 1990 1.6 engine, it was running batch/semi sequential injection by default.
Wiring up fully sequential injection (have an MS3) instantly allowed me to idle at 14 afr without surging.

Once you go bigger injectors (i have 560cc), sequential is a must it seems.