Sidewaystocurb

iTrader: (1)

This is my first attempt at tuning a vehicle. Ive installed a mspnp2 on my 91 with the stock 1.6 engine. I made a few tweaks and overall seems to drive fine. My issue is the idle. The car will not idle on its own unless I hold the idle at about 750rpm for a few seconds. It then drops to about 300RPM.

When I hold the idle at about 700-800 rpm my zeitronix wideband reads about 14-14.5 afr
When the idle drops to 250-300 rpm, afr drops to about 12-12.5

I recently did a water pump and set the timing to 10 degrees so I'm using a fixed timing of 10 degrees on megasquirt.

I went to autozone and purchased a timing light so I can verify tomorrow.

I attached an idle log. any help would be greatly appreciated.

PS: I'm using the diy autotune 1.6 map.

Lexzar

iTrader: (2)

Get the timing light, anything you do without being inline with what you tell the ecu is a waste of time.

Sidewaystocurb

iTrader: (1)

will the timing read correctly even if the engine is idling/stumbling at a crappy 300rpm?

Lexzar

iTrader: (2)

Follow the MSPNP directions to get it idling at whatever rpm and verify with timing light. Majority of basemaps will idle at some rpm after WUE.

ryansmoneypit

iTrader: (6)

You should not be running the car on "fixed timing". that is only to dial in the actual timing using the wizard. you tuned the car on 10 degrees, so it probably makes poop for power.

Sidewaystocurb

iTrader: (1)

i haven't tuned It. Can't even get it to idle yet. lol. When I get home I'm going to set it on fixed timing to check timing then set back to "use table" once I verify the timing matches.

Car is stock for now, I will install my turbo kit once I get this sorted out and understand more

ryansmoneypit

iTrader: (6)

Installed ms2, made some tweaks, seems to run fine. Those statements led me to believe that you were tuning the ecu.

Sidewaystocurb

iTrader: (1)

yeah, bit misleading. All I did was set up wideband, iat, no fuel or spark yet

Sidewaystocurb

iTrader: (1)

I checked the timing and it's good at 10 degrees.

still idling at about 500rpm per TS gauge read out and about 12.5 afr.

if I hold the gas at about 800-850 I have a 14.3-14.6 afr.

if I unplug the two pins from the IAT to the maf connector nothing happens.

if I unplug the idle control valve nothing happens.

if take off the little plug that's covering one of the throttle body vacuum ports, idle goes up and stays steady at about 850rpm.

thoughts?

Sidewaystocurb

iTrader: (1)

I adjusted the idle acrew and raised the rpm to 800. Afr looks good. I'll drive it some tomorrow.

fires right up and no stalling. Hopefully that does it. I purchased the $80 TS and MLV so I'll go do a live tune tomorrow.