Car misfire

[Rp1990]

2004 Nissan maxima Vq35de

this is my new engine with 20,000 mile on it by now. 1st time putting 10w40 royal purlpe oil in my car 2 day later in morning when I 1st crank the car up I got mis fire cel on 5 min later I open up hood n engine shaking little bit not alot. I think shop put cheapest spark plug step 1 colder plug in my engine n they did not change ignition wire lasts time. I put 20,000 miles it on those plug.

I have 75 shot but I only been sparying 7 time in 20,000 mile on it.

Can cheap step 1 colder plug go bad in 20,000 mile or iginition wire is bad?

For nitrous we need colder plug or hotter plug don't I need step 1 cold plug anybody can give me part number for plug for my car? I contacted ngk n they tld me this n tld me to gap it to .35:
http://ngk.com/results_cross.asp?pid=lfr6aix-11

Cause supid autozone telling me I need hotter spark plug. Will my cel (p1238) came on I reseted it later it never came back on expect mis fire code I hope p1238 have nothing to do with mis fire. Cause Nissan service guy tld me we not supposed reset cel never.

 

[RD400]

Your Maxima does not have plug wires. It uses an individual coil for each plug, so if one of those are faulty it would cause misfire.

The NGK link you gave has a LFR6AIX-11, which has a heat range of "6". This is one step colder than the stock "5" for a typical Nissan.

Did the Nissan tech say what the p1238 error code meant?

 

[ARCOgraphite]

Are you texting as you drive?

 

[Rp1990]

Originally Posted By: RD400
Your Maxima does not have plug wires. It uses an individual coil for each plug, so if one of those are faulty it would cause misfire.

The NGK link you gave has a LFR6AIX-11, which has a heat range of "6". This is one step colder than the stock "5" for a typical Nissan.

Did the Nissan tech say what the p1238 error code meant?


U think it may be one of coil are bad if all coil bad then car won't start. Am I correct?

I called ngk n they tld me to used to part # u gave me n tld me to gap to .35 thosandth.

About (p1238) mean this: http://ww2.justanswer.com/uploads/FixUrNissan/2010-02-16_000957_A_F_sensor_bulletin_NTB04-126.pdf


But I reseted the code then it haven't came back on expect mis fire code.

 

[ARCOgraphite]

Sounds like you toasted a plug or worse. I hope thats not a dry shot of nitrous. Thats an engine killer. If you rarely run the N2o you can use the 6 if you plan on street fighting Id run a 7 heat range - which is colder - NEVER ask anyone at an autoparts store anything about car tuning unles you just want to razz them or laugh.

 

[Rp1990]

I have wet shot I hope whoever put it in. How can I tell if is wet shot? Will first I had code p1238(driver side oxygen sensor) after that I rested the cel n it never came back on.

If I oxygen sensor was bad can spark plug go bad? The only code I have is I believe p300 which is mis fire code.

I'm not driving the car is at home in garage.

What could I do first?

HELP I want my baby alive.

(

 

[eljefino]

If the misfire came on when you first started the car I would suspect a dead miss-- the under load misfires would be more likely an engine problem. So maybe a coil just decided it had enough heat cycles and gave it up.

Nissan is not going to help you over the phone for free, and they would appreciate you not erasing the codes if you bring it in for a look-over. If I were you I'd get rid of any nitrous stuff as they'll automatically blame that with or without reason.

 

[Rp1990]

Originally Posted By: eljefino
If the misfire came on when you first started the car I would suspect a dead miss-- the under load misfires would be more likely an engine problem. So maybe a coil just decided it had enough heat cycles and gave it up.

Nissan is not going to help you over the phone for free, and they would appreciate you not erasing the codes if you bring it in for a look-over. If I were you I'd get rid of any nitrous stuff as they'll automatically blame that with or without reason.


I don't have warranty on that engine so they can't blame it on nos. Will lasts time the shop did not change coil on plug. The only thing they change is spark plug.

Does 10w40 royal purple oil have anything to do with mis fire??? Cause that the 1st time I ever put 10w40 in my car.

 

[SZR48207]

I'm not sure I understand what you are asking since you seem to not be a native English speaker, but I can tell you P1238 is not DIRECTLY related to misfire (but is worth looking into).

Also, Royal Purple is most likely not the reason for your engine troubles. Do you know if your nitrous system is safe for your vehicle?

P1238 - Fuel Pump Secondary Circuit Malfunction

 

[eljefino]

Doesn't matter if you have warranty or not.

Anything not stock Nissan, they will try to blame. This goes for stuff like remote starters and stereos too. Save them the hot air.

 

[mechtech2]

Cold plugs can and will misfire when cold. Not when brand new, but when deposits are on them.
The obvious solution is to consider that all your modifications are not working right.

 

[Rp1990]

Originally Posted By: Reddy45
I'm not sure I understand what you are asking since you seem to not be a native English speaker, but I can tell you P1238 is not DIRECTLY related to misfire (but is worth looking into).

Also, Royal Purple is most likely not the reason for your engine troubles. Do you know if your nitrous system is safe for your vehicle?

P1238 - Fuel Pump Secondary Circuit Malfunction


Idk where u got that code mean from.

P1238 mean this: http://ww2.justanswer.com/uploads/FixUrNissan/2010-02-16_000957_A_F_sensor_bulletin_NTB04-126.pdf

correct me if I'm wrong?

 

[Rp1990]

Originally Posted By: eljefino
Doesn't matter if you have warranty or not.

Anything not stock Nissan, they will try to blame. This goes for stuff like remote starters and stereos too. Save them the hot air.


Does ecu ground wire have anything to do with mis fire?

Cause I broke 10mm bolt nut that go to ecu ground wire. I hope that not have nothing to do with that.

 

[Rp1990]

I'm not sure I understand what you are asking since you seem to not be a native English speaker, but I can tell you P1238 is not DIRECTLY related to misfire (but is worth looking into).

Also, Royal Purple is most likely not the reason for your engine troubles. Do you know if your nitrous system is safe for your vehicle?

My timing is "stock" n nitrous express tld me I'll be okay with 75 shot with
my timing. But they tld me they recommend ngk spark plug but shop did not put ngk plug they put the cheapest colder step plug in my engine.

 

[chrome]

You need to clarify what DTC code you are getting:

In your opening post, you indicated you have P1238.

Then you posted a link to a Nissan service bulletin for a code P1283.

These are two different codes. Please recheck.

 

[Rp1990]

Originally Posted By: chrome
You need to clarify what DTC code you are getting:

In your opening post, you indicated you have P1238.

Then you posted a link to a Nissan service bulletin for a code P1283.

These are two different codes. Please recheck.


I know but other one mean rich code I we don't have to have two code to look at service bulletin.

I had p1238 code but not anymore expect mis fire code. U think maybe bec of ecu grounding wire bolt is broke?

 

[Rp1990]

Update:: we changed the 02 sensor A/F sensor 1 bank 2. They was 2 different color shown on 02 sensor n is was white n dark brown. After that engine stop shaking n it run better.

We clean MAF sensor. We also look at coil wire n spark plug none of them shown bad sysmbol. We check fuel pressure is was at 50 psi n fuel injector is in good condition.

Why did that happen n what make 02 sensor go bad?