sstray

Hi all, I bought and assembled a DIYPNP a few months back and I am finally getting around to installing it. I have a 1991 NA6 with all stock parts, the only addition so far has been an Innovate LC-2 wideband which I got working with the stock ECU.

When it came to installing the megasquirt, I followed the instructions thoroughly, making sure everything was calibrated and installed properly. I loaded a basemap from trubokitty.com, set my timing, and started the car. It started and idled okay, but was running very rich (AFRs in the 10-11 range). One of the first things I noticed was that my gauge and TunerStudio were displaying different AFRs, so I spent a while checking over my wiring and calibration until they displayed similar values. At this point I decided to drive up and down my street, and the AFRs remained very rich, and I could hear some pops while accelerating. After trying to change the VE tables to make the car run more lean, I realized I should do more research before trying to start tuning and gave up for the time being. I reinstalled the stock ECU, hoping to be able to drive around normally while I learned more about tuning. However, the car seems to run even worse now on the stock ECU, with very lean AFRs and misfiring while accelerating. I am worried I damaged something while trying to install megasquirt, although the engine seems to idle and run fine for the most part. Could this be related to the timing, or could it be something else like spark plugs and coils?

At this point, I may as well reinstall the megasquirt because the car runs poorly on stock ECU as well, and it is much easier to adjust timing and other things with TunerStudio. How should I continue? I am fairly certain I know how to get the car running with megasquirt now, but if the car is having issues with the stock ECU is that a sign that something else is wrong? Any help would be much appreciated.

sstray

Update - I checked my ignition timing, cam timing, spark plugs, and even recalibrated the wideband. I am still running the stock ECU, and I am noticing the AFRs are much leaner than they used to be. The car idles around 15ish, but every so often the AFRs creep up into the 16s and 17s, the rpms drop, and the car seems to struggle. Could this be an issue with my injectors? Fuel pump? Not sure where to go from here.

HmoobDude

You probably won't come back, but how did you wire up your Innovate LC-2? I run one and have never had any issues, if recall there's 4 wires for wiring. 1 for power, 1 for ground, 1 for wiring up a narrowband (OEM) and 1 for wiring up a wideband. You said you got it working with the OEM ECU, so you wired it up with the narrowband? Now that you're using MS, did you re-wire it up for the wideband?

Did you go through the separate calibration for the LC-2? In open air? IIRC, MS doesn't have an option to select for an LC-2 wideband, but you can input the voltage range on page 8 (Microsoft Word - 11-0137B LC-2.doc (innovatemotorsports.com) for the wideband. This should've gotten the gauge and TS to read closely to one another.

On start up it's supposed to be rich, the car and O2 sensors are warming up so it should be running on the Warm Up Engagement? Table. Sorry it's been awhile since I've look at TS.

Aside from all the base settings you did in your last post, did you set up the Fuel REQ aswell?

sstray

Hi, I was able to get the car running smoothly again with the stock ecu and stock o2 sensor, so I think my issue was with the wiring of my LC2. Do you remember where you grounded yours to? I think the sensor is still fully functional because it was displaying accurate numbers on the gauge, and there is only one wire running to the ecu which is connected properly, so I think my grounding point may be the issue. Currently it is just grounded to a bolt on the chassis, but I understand that this might cause noise and interfere with the signal.