M35 Nismo Ecu Low Idle And Stalling

[Lakes101]

Hey all m35 Nismo ECU owners having an issue with the nismo ecu after install seems to idle really low and stall at the lights or sitting in traffic and has thrown a CEL.

Has anyone else had an issue with there nismo ecu idling low,stalling and throwing a code or any ideas on what the issue could be?

Cheers fellas

[Dunc]

Have you done an idle air reset? Every car is different, if you've just thrown in a used ECU I'd suggest that it doesn't know that your car isn't set up for what its used to. I'd give that a whirl, procedure detailed here http://www.skylinesaustralia.com/forums/topic/275099-m35-still-stalling-not-idling-properly/#entry4662009

[Daleo]

Might be time for an Idle relearn

[Lakes101]

Thanks for the tip fellas spoke to brick and he recommends the same. I'll give it go in the morning and keep ya posted

Cheers

[Lakes101]

Ok so I did idle learn reset and all other diagnostics I could but to no avail car is still stalling.

I took out throttle body, BOV, MAF and cleaned it all, still stalls when at a stand still or coasting under 1000k. Then I took the vacuumed line off the FPR and I didn't stall as quick but inevitably still stalls after about 30-40 seconds at a stand still. So I'm stumped as to what the issue could be. Maybe MAF maybe FPR?

I thought it weird that it idles better with the vac line off the FPR though.

Any more thought gents?

[scotty nm35]

It was fine before?

What did you change?

Go back to the way it was and see if it runs, if not, the plugs may be fouled.

[Lakes101]

Yeah it was sweet before Scotty just put in the nismo ecu and it has started stalling. I'll change back to the OEM ecu tomorrow and see how it goes but not sure why the nismo would cause it.

[DaveM35]

Sounds like a shit ecu

[Lakes101]

It's from a highly regarded m35 owner on this forum. I'm sure he wouldn't be selling shit parts as it runs well just not that great when at a standstill. It's given more low to midrange torque speed limit cut and revs higher all is sweet except the idle.

Cheers for the helpful comment davelol

[DaveM35]

Lol sorry mate didn't mean to sound like a dick!

I know brick was selling it and he's a top bloke. Did he have issues running it in his car? Think he said it was a bit rich...

When we do tunes on cars at work, whether it be a re-flash or a piggyback module, if they do what your car is doing, we always send the tuning file back and keep trying till we get a good one, or we send the module back under warranty. The point I was trying to make was, if you changed absolutely nothing else on your car except the nismo ecu and it started stalling, it's very likely an ecu problem.

[DaveM35]

Ask Scotty if he knows a way to adjust base idle from a grub screw in the throttle body, not sure ours has that option but if he does he'd know it.

[scotty nm35]

Get an emanage on it, at least that way you can adjust the fuel.

No point adjusting the idle screw on an electronically controlled car. You need a consult 3 to set the idle properly, but if the AFR's are out it won't help.

[Brick]

Get an emanage on it, at least that way you can adjust the fuel.

No point adjusting the idle screw on an electronically controlled car. You need a consult 3 to set the idle properly, but if the AFR's are out it won't help.

Hey scotty, does that mean a nissan dealer would be able to adjust the idle?

[KiwiRS4T]

It's from a highly regarded m35 owner on this forum. I'm sure he wouldn't be selling shit parts as it runs well just not that great when at a standstill. It's given more low to midrange torque speed limit cut and revs higher all is sweet except the idle.

Cheers for the helpful comment davelol

ECU may have run well on the sellers car but is yours exactly the same configuration... exhaust, intake, turbo etc?

[scotty nm35]

Hey scotty, does that mean a nissan dealer would be able to adjust the idle?

Most probably. As long as the map is suited. If it's overfuelling then a throttle re-learn won't help much.

[Lakes101]

All good dave I didn't take it as an attack. Lol

Brick was running a touch rich but was still running rich with the OEM ECU still in after. It runs ok with the vac line off the FPR which I thought was wired and not sure why that is but any ideas on that would be helpful.

Scotty I plan to go down the route of an emanage just saving up for it need to pay a few parking fines first lol.

I plan to take it to Nissan on Friday and see if they can adjust the idle through the consult. Otherwise I guess I just have to learn to have a aware right foot and manually keep the revs up where they need to be till an emanage can be sourced fitted and tuned!

But brick all idle issues aside cheers for the ecu and enjoying the better low to mid range torque and repsonse it gives!!! Thumbs up mate!!

[scotty nm35]

So it's running lean at idle then... Taking the vac line off at idle would richen it up I think. Perhaps it was just setup with an adjustable fuel reg initially...

I would be getting it on a dyno before anything else... Perhaps with an adjustable reg in place so you have some control over mixtures. Otherwise, go back to the stock ecu until you have the Emanage installed.

It's unusual, I would have thought the o2 sensor would have sorted it out, it must be a fair way out...

[Lakes101]

So I couldn't get the car to Nissan today as worked dragged on. In the mean time I'll get my hand on a nismo FPR and gauge to adjust the pressure. What should the stock pressure be for the fuel? Is it around 30-40PSI? From memory.

I spoke to a few dyno places a while back and said they can't dyno tune my car as they don't have a suitable harness for it? Would that be the case as I thought there OBDII and most can connect to that.

Seems to have some hesitation when accelerating hard now aswel feels like air cut!? Weird!!

Cheers for the advice guys.

If no luck with Nissan and a dyno tune I'll just have to go back to OEM and wait for the emanage to get it all sorted.

[Lakes101]

The hesitation I've found only seems to happen in sequential mode aswell

[scotty nm35]

Hesitation usually signifies lean running, which can damage your engine. Don't worry, I have a spare VQ25det here.