ECMlink [Resolved] Evo 6 Stalling issue

[evoholic]

I'm having a stalling issue with my Evo 6 running a 2G ECMLink V3 ECU. The car also stalls while driving, and at times it feels like I'm hitting fuel cut during normal driving.

So far, I've replaced the crank angle sensor, spark plugs, replaced alternator, checked all grounds, and checked the cam sensor.

Current mods on the car include: 1000cc injectors, Walbro 255, fuel pump, intake, exhaust, and a MAF delete (running speed density).

Here's a data log on idle

 

[nice97civic]

Since you're on SD, you can zero out the fuel/timing sliders and the maf comp and clamp can be set back to stock if you've changed those, for starters.

Have you checked your fuel pump voltage while the car is running? Looking at the areas in red, fuel delivery is basically zero in these spots. If you can, get the car idling and check voltage at the pump. Surely someone will have a better suggestion but it's a start.

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[nice97civic]

Might be something else causing the fuel delivery to bottom out. Can you log ALL values and upload another log?

 

[evoholic]

Since you're on SD, you can zero out the fuel/timing sliders and the maf comp and clamp can be set back to stock if you've changed those, for starters.

Have you checked your fuel pump voltage while the car is running? Looking at the areas in red, fuel delivery is basically zero in these spots. If you can, get the car idling and check voltage at the pump. Surely someone will have a better suggestion but it's a start.

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I have checked the fuel pump voltage, and everything appears to be normal. Fuel pressure also looks fine.

I forgot to mention that I’m using an Omni 4-bar MAP sensor.

At the moment, I’m suspecting a faulty MAP sensor.

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[nice97civic]

you have "Lock intake temp and baro pressure" checked on your ECU Inputs tab. I'm not sure if this should be checked or not (mine is not, also on SD) so you may want to uncheck that and see what happens.

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[nice97civic]

Something else to consider: I've been told that the MAP sensor should be on the Baro input however, I have tried that and the car will not run. I have mind on the MDP input and car runs great. Maybe consider trying that as well.

 

[steve]

you have "Lock intake temp and baro pressure" checked on your ECU Inputs tab. I'm not sure if this should be checked or not (mine is not, also on SD) so you may want to uncheck that and see what happens.

FYI. By setting Base MAF type to Speed Density you're locking IAT and Baro by default If what I've read is accurate.

There a dropouts from your OMNI sensor which are causing the AFRRatioEst spikes.

 

[nice97civic]

FYI. By setting Base MAF type to Speed Density you're locking IAT and Baro by default If what I've read is accurate.

Interesting, noted.

 

[steve]

I couldn't find the reference here earlier but here it is: From Dave Mertz.

ECMTuning User Support Forums

This is a discussion forum for registered ECMLink users. See http://www.ecmlink.com .

www.ecmtuning.com

"With Speed-Density selected as the base MAF, it doesn't matter whether the checkbox to lock IAT and Baro is marked or not. Selecting Speed-Density or a GM MAF sensor as the base MAF automatically results in ECMLink operating with locked IAT and Baro."

 

[evoholic]

Issue resolved! The problem was a faulty Omni MAP sensor, which was replaced with an AEM MAP sensor. I’ll do a test drive later to confirm, but so far it's running well during a long idle.

 

[Justin DuBois]

Issue resolved! The problem was a faulty Omni MAP sensor, which was replaced with an AEM MAP sensor. I’ll do a test drive later to confirm, but so far it's running well during a long idle.

The AEM sensor is good - I've seen others complain about the reliability of the Omni.