SR Stutter and miss when engine is warm? - Page 3 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

BlackZenkiS14 · 09-11-2014, 10:08 PM

I mean, possibly, but I ran the tune for 3 years previously with no issues....

inopsey · 09-12-2014, 09:34 AM

how old are your plugs? i read your original post and you said they are the right color but have you recently/since this started changed them?

Mikester · 09-12-2014, 10:04 AM

Quote:

Originally Posted by BlackZenkiS14

Plugs looked good, all a light brown/bronze/tan color, all equal across all 4 cylinders.

Your plugs being a brown/bronze color tells me they are cooked... Same color they get after someone drops in some injector cleaner, octane booster etc. I'd change those first... They should be a slight dark grey, light blackish color.

Second of all, when are you going to come to terms with the fact that your ECU is probably the MAIN culprit and you are spinning your wheels throwing parts at it? This was the SAME EXACT problem I had with my 180SX... replaced everything INCLUDING the CAS... Problem magically went away when I pulled the ECU out and replaced it with a shiny new Power FC.

Going back to your plugs, they should not be bronze/brown.

BlackZenkiS14 · 09-12-2014, 03:31 PM

Not sure what you mean Mike?

But thanks for the attempted advice, I am working with JWT to figure this out as well. I appreciate you trying to help me from "throwing parts at it", but I'm not just going to "throw a $1k ECU at it" to fix it either. There are TONS of people running this setup, WITH the JWT ECU, and doing very well for a long time. I'll get it figured out eventually.

Plugs are as old as this engine is. Only 1500 miles.

Mikester · 09-12-2014, 04:11 PM

Kyle, I don't think your plugs are THE problem, I said it could be A problem. When you said bronze/brown, that's not what I had envisioned.

If there are tons of people running the very same setup, maybe someone will loan you their ECU... Until then, I hope by working with JWT you mean you sent them back your ECU for indepth testing. No disrespect brother. You know I'm all about helping a dude out. If you've the car at events, then 1500mi might be worth the 30-40 for fresh plugs. My PFC will be back next week, we have very similar setups- you're welcome to try mine.

Mikester · 09-12-2014, 04:17 PM

And by the way, you've been letting this issue kick your ass & expending time & money on it for almost 3mos based on the start date of this thread. If I were you, I'd welcome any 'attempted advice' given at this point. Trying to help man. I'd like to compare slips & I leave in 3-4 weeks.

BlackZenkiS14 · 09-12-2014, 04:22 PM

I know you are trying man, and I appreciate that, but just saying "its your ECU, buy a PFC" really isnt a feasible option at this point man.

I dont have $1k to spend on an ECU, and I dont want a PFC that I have to pay someone else to tune for me that lives out of state...

The only money I've spent on this so far is a new CTS ($20), and a new O2 sensor ($50)

I just might try throwing in a set of Iridium plugs and see what happens. I've run iridium plugs my whole life, and this is my first time ever using copper.

jr_ss · 09-12-2014, 06:25 PM

I don't think Mike is blaming the the tune, more so a circuit in the ECU itself.

It's pretty simple to pull the EPROM out and have it swapped to another ecu. I'd start with cracking the case open and seeing if you see any burnt or charred traces.

BlackZenkiS14 · 09-12-2014, 07:45 PM

Quote:

Originally Posted by jr_ss

I don't think Mike is blaming the the tune, more so a circuit in the ECU itself.

It's pretty simple to pull the EPROM out and have it swapped to another ecu. I'd start with cracking the case open and seeing if you see any burnt or charred traces.

Looked good to me so far. Also sent these to JWT

jr_ss · 09-13-2014, 01:31 AM

I agree that it does look good. A better picture of the last one would be great. I think I may see something, but then againit could be nothing at all. Regardless, it is very puzzling.

BlackZenkiS14 · 09-13-2014, 09:04 AM

Yea, I didnt realize the last one was blurry until I uploaded it lol

Im going to try to get the car to a dyno today actually and see what that graph looks like also, see if I'm losing power in the powerband also, or just between shifts.

Ben Pila at JWT is working with me and the engineer there looking at my data logs, so hopefully they can come up with something for me.

Just so frustrating, I've missed a lot of events this year, mostly because I've been too busy to work on the car to fix it, but if it was fixed I'd have been able to go.

Mikester · 09-13-2014, 10:20 AM

Kyle- not saying to get a PFC... There are WAY better & more powerful options these days... Just saying that even a 'new to you' ECU with the same JWT tune will probably fix the issue. I know I sound like a broken record- it's only because I had the exact same problem with my 180SX. Is it an E-series ECU (Chuki Blacktop) by default?

BlackZenkiS14 · 09-13-2014, 02:28 PM

Yea, we will see what Ben at JWT says. I'm open to anything.

Also, found today that even with the issues, it still makes power....plenty of it! haha

metako42 · 09-15-2014, 06:46 AM

I mention this because no-one has bought it up but it could be your injector O-rings leaking fuel into the combustion chambers when they get hot. They might just be holding the seal when cold but give them some heat and they might be not sealing. This would normally give a black plug but you never know. Also have you removed each injector wire in turn whilst idling to work out which cylinder is the culprit? Then swap injectors to see if the problem moves with it.

BlackZenkiS14 · 09-15-2014, 08:31 AM

I cant imagine that would be the issue, the injectors were rebuilt and flow tested with all o-rings replaced by Witch-Hunter just 1500 miles ago.

Thanks for the idea though!

BlackZenkiS14 · 09-17-2014, 07:56 PM

Well, I installed a known-good Z32 MAF and a known-good SR CAS. No change in the issues.

Whats next?

cotbu · 09-17-2014, 08:36 PM

I forgot you're spraying, try shutting off the alcohol mix completely to eliminate the water as a contaminant. Turn it back on after you confirm.

Sent from my Highly Tuned Galaxy S3.4!!!

BlackZenkiS14 · 09-17-2014, 08:43 PM

Will do. But that would be weird for that to be the problem, because its temperature sensitive...and the meth pump/everything is wired in totally separate of the ECU. But I'll give it a shot.

Mikester · 09-18-2014, 03:01 PM

I see your ECU is an E5... Same as my 180's was

Nice numbers bro!!!

BlackZenkiS14 · 09-18-2014, 03:41 PM

Quote:

Originally Posted by Mikester

I see your ECU is an E5... Same as my 180's was

Nice numbers bro!!!

I am hoping JWT asks me to send the ECU in for check, but at this point they have not asked for it.

BlackZenkiS14 · 10-23-2014, 09:11 PM

Well 20+ emails, 12 logs, and 3 months later I finally get this from JWT:

"Our lab engineer says he will make a revised test EPROM with the changes based on your latest logs sent. We will then mail that to you so you can switch it out and see how it runs. "

haha who knows what they think it is, but man it would be sweet if that fixed it!!

jr_ss · 10-23-2014, 10:56 PM

Agreed... Based on all the testing it had to be a hard ware issue.

Mikester · 10-26-2014, 02:17 PM

Hey Kyle- so I wonder... Isn't EPROM-

IN THE FUCKING ECU????

There went your free pizza!

ImageUploadedByTapatalk1414354964.117706.jpg

BlackZenkiS14 · 10-26-2014, 02:29 PM

Thanks Mike, that was very helpful.

I never said there was no way it was in the ECU, I just had to be patient with JWT to get back to me. I couldnt just swap ECU's lol

Mikester · 10-26-2014, 02:34 PM

Just bustin your chops brother. Given your luck, I'm glad JWT is working it- will be stoked to see your car run how it should have all along [emoji106]

BlackZenkiS14 · 10-26-2014, 11:47 PM

Quote:

Originally Posted by Mikester

Just bustin your chops brother. Given your luck, I'm glad JWT is working it- will be stoked to see your car run how it should have all along [emoji106]

Yea, I'm curious lol, since I made 419 to the tires with issues

unometeeter · 10-27-2014, 07:27 PM

Coil could be getting hot and breaking up spark, when the engine warms up.

jr_ss · 10-27-2014, 07:34 PM

Quote:

Originally Posted by unometeeter

Coil could be getting hot and breaking up spark, when the engine warms up.

Few months late to that party...

BlackZenkiS14 · 07-05-2015, 10:20 AM

Still haven't figured this out yet, wondering if anyone else has any input. Car struggled at track day yesterday, frustrating the fuck out of me.

cotbu · 07-06-2015, 10:14 AM

So what did the jwt techs say?
Did they at least send you a new tune to test out?

09-11-2014, 10:08 PM	#61
BlackZenkiS14 Nissanaholic! Join Date: Nov 2003 Location: "St. Chuck", MO Age: 38 Posts: 2,094 Trader Rating: (15) Feedback Score: 15 reviews	I mean, possibly, but I ran the tune for 3 years previously with no issues.... __________________ -Kyle

09-12-2014, 03:31 PM	#64
BlackZenkiS14 Nissanaholic! Join Date: Nov 2003 Location: "St. Chuck", MO Age: 38 Posts: 2,094 Trader Rating: (15) Feedback Score: 15 reviews	Not sure what you mean Mike? But thanks for the attempted advice, I am working with JWT to figure this out as well. I appreciate you trying to help me from "throwing parts at it", but I'm not just going to "throw a $1k ECU at it" to fix it either. There are TONS of people running this setup, WITH the JWT ECU, and doing very well for a long time. I'll get it figured out eventually. Plugs are as old as this engine is. Only 1500 miles. __________________ -Kyle

09-12-2014, 04:11 PM	#65
Mikester Nissanaholic! Join Date: Jun 2007 Location: Kathleen, GA Age: 52 Posts: 1,956 Trader Rating: (0) Feedback Score: 0 reviews	Kyle, I don't think your plugs are THE problem, I said it could be A problem. When you said bronze/brown, that's not what I had envisioned. If there are tons of people running the very same setup, maybe someone will loan you their ECU... Until then, I hope by working with JWT you mean you sent them back your ECU for indepth testing. No disrespect brother. You know I'm all about helping a dude out. If you've the car at events, then 1500mi might be worth the 30-40 for fresh plugs. My PFC will be back next week, we have very similar setups- you're welcome to try mine. __________________

09-12-2014, 04:17 PM	#66
Mikester Nissanaholic! Join Date: Jun 2007 Location: Kathleen, GA Age: 52 Posts: 1,956 Trader Rating: (0) Feedback Score: 0 reviews	And by the way, you've been letting this issue kick your ass & expending time & money on it for almost 3mos based on the start date of this thread. If I were you, I'd welcome any 'attempted advice' given at this point. Trying to help man. I'd like to compare slips & I leave in 3-4 weeks. __________________

09-12-2014, 04:22 PM	#67
BlackZenkiS14 Nissanaholic! Join Date: Nov 2003 Location: "St. Chuck", MO Age: 38 Posts: 2,094 Trader Rating: (15) Feedback Score: 15 reviews	I know you are trying man, and I appreciate that, but just saying "its your ECU, buy a PFC" really isnt a feasible option at this point man. I dont have $1k to spend on an ECU, and I dont want a PFC that I have to pay someone else to tune for me that lives out of state... The only money I've spent on this so far is a new CTS ($20), and a new O2 sensor ($50) I just might try throwing in a set of Iridium plugs and see what happens. I've run iridium plugs my whole life, and this is my first time ever using copper. __________________ -Kyle

09-12-2014, 09:34 AM	#62
inopsey Nissanaholic! Join Date: Jul 2008 Location: canada Posts: 1,701 Trader Rating: (21) Feedback Score: 21 reviews	how old are your plugs? i read your original post and you said they are the right color but have you recently/since this started changed them?

09-12-2014, 06:25 PM	#68
jr_ss Post Whore! Join Date: Dec 2005 Location: Pa Posts: 6,412 Trader Rating: (35) Feedback Score: 35 reviews	I don't think Mike is blaming the the tune, more so a circuit in the ECU itself. It's pretty simple to pull the EPROM out and have it swapped to another ecu. I'd start with cracking the case open and seeing if you see any burnt or charred traces. __________________ My SR20VET Does your VTC gear rattle in your S14/15 SR? PM me.

09-13-2014, 01:31 AM	#70
jr_ss Post Whore! Join Date: Dec 2005 Location: Pa Posts: 6,412 Trader Rating: (35) Feedback Score: 35 reviews	I agree that it does look good. A better picture of the last one would be great. I think I may see something, but then againit could be nothing at all. Regardless, it is very puzzling. __________________ My SR20VET Does your VTC gear rattle in your S14/15 SR? PM me.

09-13-2014, 09:04 AM	#71
BlackZenkiS14 Nissanaholic! Join Date: Nov 2003 Location: "St. Chuck", MO Age: 38 Posts: 2,094 Trader Rating: (15) Feedback Score: 15 reviews	Yea, I didnt realize the last one was blurry until I uploaded it lol Im going to try to get the car to a dyno today actually and see what that graph looks like also, see if I'm losing power in the powerband also, or just between shifts. Ben Pila at JWT is working with me and the engineer there looking at my data logs, so hopefully they can come up with something for me. Just so frustrating, I've missed a lot of events this year, mostly because I've been too busy to work on the car to fix it, but if it was fixed I'd have been able to go. __________________ -Kyle

09-13-2014, 10:20 AM	#72
Mikester Nissanaholic! Join Date: Jun 2007 Location: Kathleen, GA Age: 52 Posts: 1,956 Trader Rating: (0) Feedback Score: 0 reviews	Kyle- not saying to get a PFC... There are WAY better & more powerful options these days... Just saying that even a 'new to you' ECU with the same JWT tune will probably fix the issue. I know I sound like a broken record- it's only because I had the exact same problem with my 180SX. Is it an E-series ECU (Chuki Blacktop) by default? __________________

09-13-2014, 02:28 PM	#73
BlackZenkiS14 Nissanaholic! Join Date: Nov 2003 Location: "St. Chuck", MO Age: 38 Posts: 2,094 Trader Rating: (15) Feedback Score: 15 reviews	Yea, we will see what Ben at JWT says. I'm open to anything. Also, found today that even with the issues, it still makes power....plenty of it! haha __________________ -Kyle

09-15-2014, 06:46 AM	#74
metako42 Join Date: Nov 2006 Location: Carpoola Posts: 40 Trader Rating: (0) Feedback Score: 0 reviews	I mention this because no-one has bought it up but it could be your injector O-rings leaking fuel into the combustion chambers when they get hot. They might just be holding the seal when cold but give them some heat and they might be not sealing. This would normally give a black plug but you never know. Also have you removed each injector wire in turn whilst idling to work out which cylinder is the culprit? Then swap injectors to see if the problem moves with it.

09-15-2014, 08:31 AM	#75
BlackZenkiS14 Nissanaholic! Join Date: Nov 2003 Location: "St. Chuck", MO Age: 38 Posts: 2,094 Trader Rating: (15) Feedback Score: 15 reviews	I cant imagine that would be the issue, the injectors were rebuilt and flow tested with all o-rings replaced by Witch-Hunter just 1500 miles ago. Thanks for the idea though! __________________ -Kyle

09-17-2014, 07:56 PM	#76
BlackZenkiS14 Nissanaholic! Join Date: Nov 2003 Location: "St. Chuck", MO Age: 38 Posts: 2,094 Trader Rating: (15) Feedback Score: 15 reviews	Well, I installed a known-good Z32 MAF and a known-good SR CAS. No change in the issues. Whats next? __________________ -Kyle

09-17-2014, 08:36 PM	#77
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 49 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	I forgot you're spraying, try shutting off the alcohol mix completely to eliminate the water as a contaminant. Turn it back on after you confirm. Sent from my Highly Tuned Galaxy S3.4!!! __________________ LoverTechnologies "Half Broken Things!"

09-17-2014, 08:43 PM	#78
BlackZenkiS14 Nissanaholic! Join Date: Nov 2003 Location: "St. Chuck", MO Age: 38 Posts: 2,094 Trader Rating: (15) Feedback Score: 15 reviews	Will do. But that would be weird for that to be the problem, because its temperature sensitive...and the meth pump/everything is wired in totally separate of the ECU. But I'll give it a shot. __________________ -Kyle

09-18-2014, 03:01 PM	#79
Mikester Nissanaholic! Join Date: Jun 2007 Location: Kathleen, GA Age: 52 Posts: 1,956 Trader Rating: (0) Feedback Score: 0 reviews	I see your ECU is an E5... Same as my 180's was Nice numbers bro!!! __________________

10-23-2014, 09:11 PM	#81
BlackZenkiS14 Nissanaholic! Join Date: Nov 2003 Location: "St. Chuck", MO Age: 38 Posts: 2,094 Trader Rating: (15) Feedback Score: 15 reviews	Well 20+ emails, 12 logs, and 3 months later I finally get this from JWT: "Our lab engineer says he will make a revised test EPROM with the changes based on your latest logs sent. We will then mail that to you so you can switch it out and see how it runs. " haha who knows what they think it is, but man it would be sweet if that fixed it!! __________________ -Kyle

10-23-2014, 10:56 PM	#82
jr_ss Post Whore! Join Date: Dec 2005 Location: Pa Posts: 6,412 Trader Rating: (35) Feedback Score: 35 reviews	Agreed... Based on all the testing it had to be a hard ware issue. __________________ My SR20VET Does your VTC gear rattle in your S14/15 SR? PM me.

10-26-2014, 02:17 PM	#83
Mikester Nissanaholic! Join Date: Jun 2007 Location: Kathleen, GA Age: 52 Posts: 1,956 Trader Rating: (0) Feedback Score: 0 reviews	SR Stutter and miss when engine is warm? Hey Kyle- so I wonder... Isn't EPROM- IN THE FUCKING ECU???? There went your free pizza! ImageUploadedByTapatalk1414354964.117706.jpg __________________

10-26-2014, 02:29 PM	#84
BlackZenkiS14 Nissanaholic! Join Date: Nov 2003 Location: "St. Chuck", MO Age: 38 Posts: 2,094 Trader Rating: (15) Feedback Score: 15 reviews	Thanks Mike, that was very helpful. I never said there was no way it was in the ECU, I just had to be patient with JWT to get back to me. I couldnt just swap ECU's lol __________________ -Kyle

10-26-2014, 02:34 PM	#85
Mikester Nissanaholic! Join Date: Jun 2007 Location: Kathleen, GA Age: 52 Posts: 1,956 Trader Rating: (0) Feedback Score: 0 reviews	Just bustin your chops brother. Given your luck, I'm glad JWT is working it- will be stoked to see your car run how it should have all along [emoji106] __________________

10-27-2014, 07:27 PM	#87
unometeeter Leaky Injector Join Date: Nov 2011 Location: navarre Age: 30 Posts: 121 Trader Rating: (2) Feedback Score: 2 reviews	Coil could be getting hot and breaking up spark, when the engine warms up. __________________

07-05-2015, 10:20 AM	#89
BlackZenkiS14 Nissanaholic! Join Date: Nov 2003 Location: "St. Chuck", MO Age: 38 Posts: 2,094 Trader Rating: (15) Feedback Score: 15 reviews	Still haven't figured this out yet, wondering if anyone else has any input. Car struggled at track day yesterday, frustrating the fuck out of me. __________________ -Kyle

07-06-2015, 10:14 AM	#90
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 49 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	So what did the jwt techs say? Did they at least send you a new tune to test out? __________________ LoverTechnologies "Half Broken Things!"