Running rough with my GTM SC...

Kirkster

Yes, it has been a while since I have checked in on the F.I. side of things on the forum.

I am having a weird problem with my Z right now. It seem when I start my car it feels like it is only running on 5 cylinders. After it warms up it seems to be fine but seems to stutter just a little bit when boost kicks in then it is fine again. The SC seems just fine, it seems more like an ignition problem.

I am thinking I either have a spark plug going, a coil going or maybe my cat is going as I am still on the stock cats.

While logging it seems that bank A is running a point higher than bank B. Now I regret only putting in one wideband sensor as the factory sensors are meh.

The car is not throwing any codes. I have not pulled the plugs yet to inspect them as I have my hands full with my race car build (240Z built to SCCA BSP Solo specs) and want to get that running ASAP. would have been done sooner but winter was brutal this year and it was too damn cold to work in the garage...

25,000 miles with no problems and now this... Pretty lucky I guess...

Any thoughts????

__________________
Powertrain Warranty voided on 5/14/2011
Mod List:GTM Supercharger,SmartTop module, Oil Cooler, GT-R Start button, Nismo Exhaust, BC Racing ER Coilovers, Backup Camara
For eastwest:

Chuck33079

I'd swap the plugs first and go from there.

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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

theDreamer

I would say plugs first, then maybe MAF cleaning/check.
After that it could be a number of things potentially but changing the plugs is a priority now.

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theDreamer's Z // Fast Intentions // Uprev // GTM // HKS // TEIN
theDreamer's Silvia // URAS // GREDDY
Houston Zs // Facebook // Twitter // Instagram

Chuck33079

Plus, plugs and Mafs are the cheapest possible solutions.

__________________
2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

Kirkster

I have a set of one step cooler plugs (than the stock ones that are in it now, long story, thanks GTM) sitting on my work bench... Guess I will try that first.

K

__________________
Powertrain Warranty voided on 5/14/2011
Mod List:GTM Supercharger,SmartTop module, Oil Cooler, GT-R Start button, Nismo Exhaust, BC Racing ER Coilovers, Backup Camara
For eastwest:

DIGItonium

When that happens, is there strong fuel smell coming out of the exhaust? You might want to give it an oil change due to so much unburnt fuel in the cylinders. This happened once in December. I also plan to get my spark plugs replaced this summer.

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theDreamer

What plugs you guys currently running or want to?
I was quoted NGK and they are a fair price, half the price of the HKS equivalent.

__________________
theDreamer's Z // Fast Intentions // Uprev // GTM // HKS // TEIN
theDreamer's Silvia // URAS // GREDDY
Houston Zs // Facebook // Twitter // Instagram

Tombonombona

In for updates as I am having a similar problem albeit much much worse.

__________________
Tom B.
Exotic Speed R2 Titan Catback-GTM Stage 2 Supercharger 522 whp on a mustang dyno
2004 Subaru STi *SOLD* *WRITTEN OFF*

Kirkster

I think there is a stronger exhaust smell. Not sure it is really a stronger fuel smell though.

I have HKS plugs on the workbench (Somewhere under all of the 240Z parts)

__________________
Powertrain Warranty voided on 5/14/2011
Mod List:GTM Supercharger,SmartTop module, Oil Cooler, GT-R Start button, Nismo Exhaust, BC Racing ER Coilovers, Backup Camara
For eastwest:

Tombonombona

Where do you guys get the spark plugs from... All I have close to me is a NAPA

__________________
Tom B.
Exotic Speed R2 Titan Catback-GTM Stage 2 Supercharger 522 whp on a mustang dyno
2004 Subaru STi *SOLD* *WRITTEN OFF*

Kirkster

GTM sent me mine, after I finished the install of course...

__________________
Powertrain Warranty voided on 5/14/2011
Mod List:GTM Supercharger,SmartTop module, Oil Cooler, GT-R Start button, Nismo Exhaust, BC Racing ER Coilovers, Backup Camara
For eastwest:

Chuck33079

Go to the dealer. Get a set of OEM GTR plugs.

__________________
2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

Kirkster

Plugs are changed.

The engine is running a bit rich but there do not seem to be any obviously wet or overly fowled plugs, It was definitely time to change the plugs as they were way out of gap and the electrodes were not looking great.

As the car is running a bit rich I am betting one of the cats is done.

It really sounds exhaust related not sure if there is any way to check other than pulling the cats...

Guess it is time to go looking for some take off cats...

__________________
Powertrain Warranty voided on 5/14/2011
Mod List:GTM Supercharger,SmartTop module, Oil Cooler, GT-R Start button, Nismo Exhaust, BC Racing ER Coilovers, Backup Camara
For eastwest:

Kirkster

Turns out I had a dead injector. Sorry for the long wait on an update...

__________________
Powertrain Warranty voided on 5/14/2011
Mod List:GTM Supercharger,SmartTop module, Oil Cooler, GT-R Start button, Nismo Exhaust, BC Racing ER Coilovers, Backup Camara
For eastwest:

GAMMA MOTORS

Check the corrections on both banks and see if they are the same . That would be a starting point. The bank that have a higher corrections will be the one that is having the issue .