Car still misfiring. A LOT tried so far

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11-29-2014, 10:42 PM

#41

Child_uv_KoRn

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OK, this is a big difference about the revs! I thought you had power and it drove normal. I also missed the part about the TB not opening.

I guess you just have to see what happens after swapping it.

Last edited by Child_uv_KoRn; 11-29-2014 at 10:46 PM.

11-29-2014, 10:43 PM

#42

nestorlugo

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Quote:

Originally Posted by AcuraLegend

It's late, so I think I;m not explaining clearly

Sorry.

All of the REAR bank are OEM coils. I also did all NGK plats on all 6 last week. they're new back there.

My misfire is MUCH less violent. It's not a cylinder deactivating mis anymore. That was fixed by replacing the coil that jumped from 4 to 6 when I swapped it.

My misfire is now really only at idle. Also, no CEL at all if I let it idle. I let it run for 30min, no SES. I took it for drive, still rough idle. Give it heavy throttle and SES come on. I checked it immediately - and no cylinder code - just random misfire. I also notice no change in power when I press the throttle. RPMS rise, but I'm not getting any throttle response. That paired with the fact it wont open when I press the pedal - I think the LAST thing to fix is the TB.

So far it was:

-Dirty IAVT solenoids
-Dirty Plugs (all new)
-Non oem coils - replaced 2
-Destroyed intake gasket
-Cracked PCV gas blowbyhose
-Cracked PCV rear intake hose

I hope that makes sense, it's late

Ok then it's early and therefore they still serve alcohol! so you!,my friend get a drink and relax imo i think bank 1 injectors should be changed or refurbished,if the result on the neighbors car comes inconclusive....otherwise tb next i guess...

11-29-2014, 10:45 PM

#43

AcuraLegend

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Quote:

Yeah, it never has. Im sorry for not making that clear from the jump!

Last edited by AcuraLegend; 11-29-2014 at 10:48 PM.

11-29-2014, 10:47 PM

#44

AcuraLegend

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Quote:

Originally Posted by nestorlugo

I got plenty of beers man. So I'm still all in. Hahaha.

Im just not following the injector logic...

If I pull injector 1 - and cylinder starts missing , I know injector one is passing fuel, right?

I pull injector 3, and the idle condition doesnt change - injector 3 is not passing fuel - and should be changed?

Last edited by AcuraLegend; 11-29-2014 at 10:50 PM.

11-29-2014, 10:51 PM

#45

AcuraLegend

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WOW. I love the web. I just found this (on another site)...
But my cats are hollowed. Are my o2 sensors even working anymore? This may not apply, but the symptoms sound almost identical. I wonder if when they hollowe them out, if they connected the harness backwards.....

:
Customer:
The valve cover gaskets were replaced recently (a few months before this started)

Customer:
And the engine has been run low on oil in the past. I feared compression problems but the way the problem comes and goes had me wondering

Jay :
Oh

Jay :
Wait a min

Jay :
I want you to check something

Jay :
You mentioned you had valve covers done

Jay :
There is one thing I have seen I would like you to check for me

Jay :
I have seen where 02 sensors on the passenger side can get plugged in backwards

Jay :
I want you to go to the 02 sensors on the passenger side.
Jay :
and If you can do this for me it would help me to help you.

Jay :
what I need you to do is this

Jay :
bank 1 is the passenger side, and bank 2 is the drivers side

Jay :
I want you to look at the wire colors for Bank 1 sensor 1 02 sensor, and Ban 2 sensor 1 02 sensor and give me the wire colors on the harness side of the connector

Jay :
So I can check to make sure they are plugged in correctly

Jay :
Then I want you to do the same thing for the rear 02 sensors.

Jay :
Cause if backwards that can also confuse the computer

Customer:
Are the 1 o2 sensors the ones I see plugged into the exaust manifolds?

Jay :
Yes, there is one in the manifold and after the manifold

Jay :
there is two 02 sensors on each side

Jay :
This can also cause the possible misfire if what I am thinking maybe your problem.

Customer:
I will go look right now... standby

Jay :
Take your time

Lets see if my gutt instinct is right on this.

Customer:
You sir, are a genius.

Jay :
you found something?

Customer:
When I looked at the connectors, I noticed there was a white paint marker drawn across the male and female connectors, but the marks didnt line up. I switched the two connectors, and they matched up perfectly.

Customer:
The car idles smooth now

Jay :
Cool deal

Customer:
That was the kind of thing only a nissan guy would know, anyone else would have just started listed off stuff to replace

Jay :
I know nothing about Nissans...

Jay :
hehe
Jay :
J/K

Read more: http://www.justanswer.com/nissan/6j6...#ixzz3KX27BZAW

Last edited by AcuraLegend; 11-29-2014 at 10:54 PM.

11-29-2014, 10:53 PM

#46

nestorlugo

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Quote:

Originally Posted by AcuraLegend

Not necessary the compression pressure should be tested along with fuel pressure if no malfunction is found check the timing.... Change the $20+ fuel filter that's suppose to last a lifetime and if you really wanna get giggy with it the fps too...

Last edited by nestorlugo; 11-29-2014 at 10:58 PM.

11-29-2014, 11:32 PM

#47

Child_uv_KoRn

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Quote:

Originally Posted by AcuraLegend

That should be impossible and it doesn't matter. Wires 1 and 3 are for the heater and the middle is signal.

If somehow the O2s are causing a problem you can just unplug the primaries (or all of them).

11-30-2014, 12:13 AM

#48

AcuraLegend

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Quote:

Originally Posted by Child_uv_KoRn

lol yeah, I realized that when I got under the car. I was like :uhhhhh, must be for a different nissan lol

I'm going to try unplugging them tomorrow, and see how it acts.

11-30-2014, 12:14 AM

#49

AcuraLegend

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Quote:

Originally Posted by nestorlugo

I'm not sure if this app can test the fuel pressure, but I'll check it out.

11-30-2014, 02:22 AM

#50

AcuraLegend

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Quote:

Originally Posted by Child_uv_KoRn

So there's a really stupid trick I learned. From the 350z forum.....

To get the valve on the TB to open, with the ignition set to on, YOU ALSO HAVE TO HAVE THE CAR IN GEAR.

I put it into 1st, wedged the throttle down, turned ignition to 'on' - And YES the TB valve moves. I also did continuity and power tests earlier, so that saves me some money on a TB.

11-30-2014, 02:25 AM

#51

AcuraLegend

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Quote:

Originally Posted by Child_uv_KoRn

No change with the o2 sensors removed (like I thought).

Im running out of ideas. Maybe the fuel filter and if i can figure out a way to test test the fuel pressure, maybe an injector or 2.

I also still might have a vacuum leak. Not sure where, but i'm running out of things to check!

11-30-2014, 02:50 AM

#52

Child_uv_KoRn

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What's left? Maf and injectors? But I don't see how injectors could cause such power loss.

You still have precats? Clogged cats will cause it to barely have power, but idk about idle.

11-30-2014, 03:01 AM

#53

AcuraLegend

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Quote:

Originally Posted by Child_uv_KoRn

What's left? Maf and injectors? But I don't see how injectors could cause such power loss.

You still have precats? Clogged cats will cause it to barely have power, but idk about idle.

Theyve been gutted out. I was getting o2 sensor codes on both banks, so they gutted em.

I cleaned out my MAF as one of the first things. Ive never gotten a code on it, its an expensive *** sensor, I dont want to just replace it.

My diag software on my android phone doesnt test fuel pressure. I know I can get a gauge at AZ, but I don't know what Im doing past that.

Last edited by AcuraLegend; 11-30-2014 at 03:03 AM.

11-30-2014, 05:58 AM

#54

dwapenyi

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Haven't read the entire thread, but if the misfire is mild, I would look into TCW3. Maybe your injectors aren't totally synced. The ecu assumes the injectors are identical. Anyway, TCW3 makes for a buttery smooth idle and makes your car run quieter.

Also perhaps clean your grounds so all electrical components are "talking" to the ecu clearly.

11-30-2014, 01:15 PM

#55

Phantasm

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Quote:

Originally Posted by AcuraLegend

I'm not sure if this app can test the fuel pressure, but I'll check it out.

I second checking this, though I just went ahead and replaced my fuel pump, pretty cheap aftermarket part (it's located on top of the tank under the back seat -pretty easy swap, stinky but easy). This Fixed ALL of my stalling problems and misfire issues SES codes. Gotta have fuel present before anything will combust.
2002 Maxima SE 6spd @ 168k miles

11-30-2014, 01:24 PM

#56

AcuraLegend

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I'm back in the direction of a vacuum leak.

I'm pretty sure I can hear air escaping right at the intake elbow. Especially when I turn the car off, I can hear a VERY faint hiss at the area of the elbow. Kind of where the Idle Air Control unit is.

I would think fuel injectors would cause stalling or bad hesitation at acceleration. I'm not getting those (anymore).