DonnieD

I have the following mods:
82mm OEM Mercedes throttle body
550 injectors
Stage 2 fuel rail
Upgraded HE and Meizere pump
Trunk tank
Kleemann headers with front cat delete
Colder plugs
168mm lower. And smaller upper pulley (roughly 180mm equivalent)
Belt wrap kit
Eurocharged tune and trans tune

The good...11.2@125 first time to track

The bad...after adaptation, the car will stumble, idle awfully, at times will run so lean that it will pop back through the intake.

I have called and spoken with Jerry. No help

I have called and spoken to Adam. Acted like he had never heard of this before.

I have check the engine over and over. NO Air leaks! It is the tune. If i cant get to the bottom of this, i will reinstall the stock injectors, and get a Kleemann tune...i know it works. I have used it before. Just was lured into the bigger injectors.


HAS Anyone had anything like this..... Car runs perfect after reset. Drive slow and low and let adaptation happen, it will run so lean.......

RedBullJnky

Box tune or dyno tune?

Great time for the first time at the track!

amg guy

iTrader: (1)

Probably more the throttle body rather than the injectors.

DonnieD

Box tune then 1 reflash on dyno.

Hulk

When you get the rough idle is it a misfire?

chawkins2001

I ran side by side down the track with him, stout for sure. Took all I had to chase that beast down!

We are at the 2:30min mark on the vid, move the little round cursor at the bottom of the vid to get to the run:

RedBullJnky

Wow! It doesn't sound like your getting any help from Eurocharged. My car did that at first, but Jerry dyno tuned it again and I've never had the problem again.
Hopefully they will help you get it all sorted out. Good luck!

BTW what is a stage 2 fuel rail? If its just looped, then who made it?

e55amgrocket

99% sure it's the throttle body causing the issue. What 82mm TB do you have?

DonnieD

I will not let it get to the misfire point. I have a dedicated wideband and can see when it happens. I have no codes or check engine light. It just runs really lean at idle and part load after adaptation occurs. I then have to do the adaptation reset and it goes away for three or four days.

GT-ER

That's odd. I was sent 750cc injectors by mistake and was tuned for 550cc injectors and even then the car ran pretty darn good. Don't know what would be wrong with yours.

DonnieD

The car runs great until it adapts...then it runs like it is running out of fuel .

DonnieD

GT-ER

No codes?

DonnieD

None. I have a star tester. It would if i pushed it, but i am really scared of lean plus boost.

Shifter

Sc clutch locked?

uberwag

That's interesting-I am having a similar problem with a similar build (see sig, stumbling and leaning out after it adapts), but my rough idle is throwing codes (P2096/P2098/P0505), and the interior lights/headlights are dimming/bouncing with idle. Have already replaced an O2 sensor to address the lean code (might be doing the next one too), but before that will be replacing the voltage regulator (per a few suggestions).

Also, I have an EC tune now, but it did it before with a different tune, so I don't think it is the tune necessarily. Working with Jerry and others though, so if it is, at least we will get it both figured out

pearlpower

Tune.

PACougar

+1, can you check to see if the SC is engaged when this happens.

Hulk

do the tb reset , if still the problem persists then its the toon

GT-ER

True, I've never even heard of this happening until it's happened to various cars here in the past few months.

GT-ER

As in, the looney toon?

Hulk

Lol
Tune

amg guy

iTrader: (1)

I have pretty much the identical setup without the 82mm TB and I have no problems what so ever.

Its the TB.

loungn14

I wouldn't recommend that at all unless you are also going to remove one of the pullies as well.

at idle when your lean can you check your throttle percent? (tps) Did you bump the idle via star as well when the tb was installed?

The thing that gets me is its fine after adaptation reset then goes bad. That starts to point to me in something that is telling the ecu to do something different to accommodate. Do you have any pending codes? Can you also triple verify that the injectors are seating correctly and make sure the connectors are seated well. I have seen something similar where one of the injector connectors wasn't fully snapped on and lose.

Gadget

If you are at a steady cruise, does the ECU maintain roughly 14.7:1 AFR?

When you see this lean thing, is it when you do a slow tip in from cruise and see it go lean as soon as it goes into open loop?

What is your fuel trim deviation in closed loop holding a steady 60 MPH on flat ground?

G