On the highway I would be driving at 60 or so and floor it and nothing would happen.. a second later it would lurch and take off.

I tried putting it on cruse control and I would feel surges of power and then it would feel like it lost the power, but it could keep a constant pace.

The exhaust smells worse then normal.. I know it's a fuel delivery issue.

Here are my possible thoughts on what it could be:

I have testpipes & 90k on the clock, Bad O2 Sensors? at what mileage should they be replaced?

Maybe faulty fuel pump?

MAF dirty?

Bad Gas?? (it's at 1/4th Tank and it just started happening)

I unplugged the negative battery terminal and let it sit but it still does it...

HELP!!!!

Good job. Next time pull the codes. It's very possible that the MAF or some other sensor is malfunctioning. I won't touch test pipes, so I can't help you there.

F/S:G35/350Z/FX35/Altima Grounding Kits

What are you running? Brake Setup Poll -- Plenum/Spacer/Intake Manifold

Drive it some more until it starts acting up then run the codes.

If your car is an automatic a failing torque convertor can make the car act like you said its acting... so can a clogged fuel filter!

With the car idling can you hear a mis fire?

Have you checked under the hood for loose wires?

"Giraffe men just have different priorities from human men. The principle remains sound." LOKI

From what I understand a faulty O2 sensor causes these same conditions..

The car has 90k and from what I have read you should really change the sensors at 100k.. + it does not help that I have test pipes.

I'm going to see if I can get a code out of it (it's still running crappy and the CEL is still on) if it is the O2 sensors it's an easy fix that should run me about $150 including defowlers.

Until then I'll just drive the Versa.

http://www.myspace.com/brandnamesoda

Check the codes.

Recommended change interval is 100K miles i believe, but I think your problem is only because you didnt already have defoulers set up on your test pipes. Too much exhaust, too much heat...pushes O2 sensors out very quickly.

Where you find the O2 sensors for $150? There are 4 four our cars, 2 pre cat(unheated) and 2 post cat(heated).

JWT Popcharger || Z-Tube || GroundingGear 10 wire kit || BLOX 5/8" plenum spacer || 350Z suspension || 350Z HR -pipe || Coupe Mid-Pipe || HKS Rear Section || Stillen Sway Bars || Stillen Rear Bumper Lip || Full Billet Grille || Slotted/X drilled rotors || ATE SuperBlue Brake Fluid || SS Braided Brake Lines
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"To a man with a hammer everything looks like a nail." -Mark Twain

If this is not hapenning at idle, then i urge you to check the little fuses in the fuse box. Get a CEL code check. Bad fuel, bad fuel filter, bad pressure regulator, an aging fuel pump, will cause this type of behavior in a car especially when it is in motion--sometimes, it will drive fine and and other times it just annoys the heck out of you. It will most likely progressively get worse as it gets more clogged up or unable to push more fuel to the engine. Just my 2 cents.

This is debatable. One of our lovely newer members made it a point to "inform" us that there are no pre-cats on our cars. Then made sure we all knew how stupid we were.

I looked up the FSM and couldn't find much info on the Cats. There was no mention of a pre-cat that I saw.

Jacko,

IIRC, the ECU will go into "protection" mode if the MAF fails completely. It runs the fuel mixture very rich and limits engine RPMs to 4k or so.

Thanks! Good info.

The check engine light is on which makes me think it's the 02 sensors because I don't think a faulty fuel pump can throw a CEL.

Also put the ecm in diagnostic mode and see what codes come up.

Factory Service Manuals can be found here

I recently had the CEL come on in the cobra.
Took it to Autozone for them to pull the codes.
It pointed to a mis-fire on bank 1.
I replaced the spark plugs on the pass. side. (even tho the wires & plugs were changed 20K ago)
Light came back on after 50 miles and was still idling strange.

Took it to FURD and had them run a diagnostic.
It said the pass side O2 sensor was bad - between engine & cat.
I replace it, reset the codes, drives SMOOTH.
Ran it 100 miles and had it inspected. Light has been off since.

Had a 01 Pathy. Same thing.
Took it to Advance. They pulled the codes and said it was a mis-fire due to bad spark plug.
Took it to Nissan, they ran a diagnostic and it was an O2 sensor that was bad.

Beware of autozone and advance.

Daughter's Max was running like crap - skipping.
Took it to Autozone.
They pulled the codes and said a number 4 mis-fire.
Bought a spark plug and coil pack. It was the number 4 coil pack.
Sometimes they get it right!!

Good luck!!!

My bet is an O2 sensor, but I might try some fresh gas & Lucas gas treatment first.

Another part than can cause this problem is a distributor--I have no idea what the equivalent is in these modern cars or in a G-35 Coupe which has so much electronics. I know the G has a distributor or an equivalent---a part that controls timing and current to the spark plugs. However, if that component is bad, the ECU will always pick it up as a code, and the CEL may not necessarily come on.

Coil packs and electronic ignition.

All were O2 Sensor

What it said..

Bank 1 Sensor 1
Bank 2 Sensor 1
Bank 2 Sensor 2
Bank 1 Sensor 1 *Pending*
Bank 2 Sensor 1
Bank 2 Sensor 2 *Pending*

Put that in english please?

I see it as both O2s after the cat and one of the upper O2s?

What's with the *Pending* ???

Am I right>?

Ok now.. can I go with universal O2 sensors? they are like half the price and right now I'm super poor.
I just paid for my wife's school

Thanks! I needed that. sometimes this brain of mine starts to do its own thing.

I think you should replace all fo the O2 Sensors just to be safe! You are not going to change 2 and then that might cause you more problems later?

but I would do it right the first time

DJ

Black 2006 G35 Sedan 6MT w/ Aero Package - Shark Fin - 19 inch Rims off the Coupe - JWT Pop Charger - Z Tube - 350z HR Y Pipe - Coupe Mid Pipe - Black Side Markers - 15% tint all the way around - Polk Audio DB1000 Tweeters - Royal Purple 5w-30 Synthetic - And a 170lb Fat Man!

Very sound advice---replace all the 02, even if with universal o2 sensors.

Quote, originally posted by Kenrik »

Codes PO132 PO152 PO158 PO132 (Pending??) PO152 (Pending??) All were O2 Sensor What it said.. Bank 1 Sensor 1 Bank 2 Sensor 1 Bank 2 Sensor 2 Bank 1 Sensor 1 *Pending* Bank 2 Sensor 1 Bank 2 Sensor 2 *Pending* Put that in english please? I see it as both O2s after the cat and one of the upper O2s? What's with the *Pending* ??? Am I right>? Ok now.. can I go with universal O2 sensors? they are like half the price and right now I'm super poor. I just paid for my wife's school

PO158 - O2 sensor bank 2 sensor 2
PO132 sensor1 bank1
PO152 sensor1 bank 2

Possible Causes:

1.bad 02 sensor(most likely)
2.running really rich
3. fuel pressure return line blocked/broken or pressure regulator no workie or leaking.

I guess you never had SAAB.

zozo

You mean there is no longer a distributor cap, points, and a condensor?

Telcoman

2006 G35 6 Speed Manual Premium Package A Factory Sirius Radio 72.8k miles, original brakes. No mods required, I love her the way she came. Mod money goes to 401K. Regular 87 Octane, all the time. Last fillup 24.60 MPG @ $1.79 gal.

Lucky I had a mis fire #3 in my hemi ram, pulled the plugs and the gaps were closed, pulled the head and found the ring land was missing from 12 o clock to about 3 oclock.

The universals will work fine you may end up splicing wires cause they probably won't just plug in. Check how many wires your O2 sensors have now vs the universal I think there are 4 and 5 wire O2 sensors (with or without heater?) I would replace all 4 O2 sensors.

Nice scan tool! I HAD an autoxray that I sold when I sold my Ram.

Thanks for the vote of confidence. LOL.

But I'm not sure I can be too specific on this topic. Codes can appear for a variety of reasons, not just a failure of the sensors themselves. I'm dealing with a handful of codes on two of my parent's cars. One is a 01 Sentra my mom just got. Followed the FSM procedures and determined the sensor the code involves was bad. Replaced it and the code still comes up.

For Kenrik's car, it doesn't come off like O2 sensor malfunctions. I wouldn't expect several of them to fail simultaneously nor would I expect the car to run that poorly from a worn out or faulty O2 sensor. My guess would be that something else may be causing the issue that isn't detected by the OBD2 and is causing the O2 sensor readings to be way off. The FSM should go through all the possibilities.

May want to check that...most modern cars have them and people don't really realize they should be changed every 20k or so...

I think all Nissan/Infinitis since 2000 only have one fuel filter. It's a sleeve filter that's part of the fuel pump. They did away with the in-line filter.

I know this is true for the G and the Maxima. I assume it's the same for the other vehicles.

ME TOO 1991 Sunbird I bought for $100 with a blown head gasket.

Did exactly what Kenricks car is doing + would NOT shift under full throttle, if you let up it would shift.

Pontiac dealership didn't charge me and told me to replace the ff.

The fuel filters are only in the tank on the G and from what I have read get replaced when you do a fuel pump. I personally thought it was the O2 sensors because they are due to be changed at 100k and I have test pipes.

My Exhaust smells like a 1982 Ford Econoline Van...

when I drove it yesterday it was not bucking but I could feel it had less power then it usually does.

Are the four O2 sensors different?? I have seen Universals for $33 each..
http://www2.partstrain.com/sto...+5843

Do I buy 4 of those? are the upper O2s different from the lowers??

Which ones do I get? I need the cheapest possible that will work.

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Quote, originally posted by Kenrik »

I liked the idea that it was the O2 sensor... I don't care to track down another issue.. The fuel filters are only in the tank on the G and from what I have read get replaced when you do a fuel pump. I personally thought it was the O2 sensors because they are due to be changed at 100k and I have test pipes. My Exhaust smells like a 1982 Ford Econoline Van... when I drove it yesterday it was not bucking but I could feel it had less power then it usually does. Are the four O2 sensors different?? I have seen Universals for $33 each.. http://www2.partstrain.com/sto...+5843 Do I buy 4 of those? are the upper O2s different from the lowers?? Which ones do I get? I need the cheapest possible that will work.

Pre cat and post cat will be different, right to left the same. So you need 2 pre cat and 2 post cat.

WOW those are exspensive!

I bet the only difference between the universal and the Infiniti specific is the connector on the end BUT you could always cut your connector off the old sensor and splice it onto the new sensor.

Good LUCK!

I don't think it would go into a failsafe over bad O2 sensors. And if something else were to cause a failsafe, a code would likely come up. My thought is that its likely something else that is causing the poor running condition (that is not out of the range enough to trigger a code) and may be causing an O2 sensor reading that is out of range. I would go through the entire diagnostic procedure for the given codes in the FSM. Otherwise you may end up replacing the sensors and still have the problem. Or worse yet, if the problem caused damage to teh O2 sensors, an unresolved problem may destroy your brand new sensors as well.

We do have 2 oxygen sensors before the cats at least for the 2003 (they are the same sensors for both sides of the manifold) and we have 2 sensors after the cat.

I'm positive of this. The parts manual is clear on this.

http://www.infinitipartsonline...gid=0

The pre cats (front 2) are the same, where as the post cats are different right to left.

You should be buying 2 universal unheated O2 sensors, and i believe 2 heated O2 sensors(even though they are different from the plug and play stock options). It will just be a little splicing of wires, which sometimes sucks a nut when you dont have a lot of room.

Ok, here's the issue. I think I misunderstood the original post.

It makes sense that there are two O2 sensors before the cat (pre cat) and two after.

I thought Kenrik though there were two sensor in/on the "Pre-cat" - essentially a cat before the main cat that prevented emissions while the exhaust was still cool. I think Nissan has/is doing away with them due to all of the Sentra/Altima engine failures that were caused by the "Pre-cat".