My 1999 Q45t with 94,000 miles has a stumble at idle

[maxnix]

DID IT FIX THE PROBLEM ?

What be "it"?

I think it was more of a report symptoms than a cure.

BTW, I did fix my stumble by replacing the failed coilpack, after new plugs, plenum cleaning, IAC and EGR, rehabilitation.

[99q45t_vl]

Yes, it did. The injector replacement that is.

[99q45t_vl]

I get the parts from Joe, and provide my own labor :-) I had the power balance test done at the dealer to exclude the plugs and coils as a misfire source (had 2 new coils and plugs put in). For now, there is no stumble, but I know, never say never!

[Qproject]

WHAT DO U THINK "IT" IS ? does everything have to be spelled out for you.

you fixed your trouble NOT by replacing your coilpacks, it was probably due to a a combination of the new plugs, plenum cleaning, IAC, egr, etc. Dirty injectors, EGR, plugs was probably causing the stumble, and probably throwing of the P0303.

What be "it"?

I think it was more of a report symptoms than a cure.

BTW, I did fix my stumble by replacing the failed coilpack, after new plugs, plenum cleaning, IAC and EGR, rehabilitation.

[Qproject]

wait a minute, bot maxnix and q45tech should know the fix to this.

I have a print out of a posting dated back in 11-2-2006.

IF THE FREAKING SEARCH FUNCTION WAS WORTH ANYTHING, we wouldn't be going throught the same old sh*t all the time.

the culprit was dirty injectors, a can of BG44K did the trick. or IAC mi-adjusted, clean out the intake plenum, egr valve, and throttle body.

[maxnix]

WHAT DO U THINK "IT" IS ? does everything have to be spelled out for you.

Don't know who U is, but replacing the failed coilpack after I restored the intake to as new condition did it for me.

Funny, I saw neither U nor you around, so I don't know how you could know, not having any personal knowledge.

[ZMARKUS]

No, I mean p0330 which is ( knock sensor #2). That's the code my car gives when scanned although there is no check engine light.

[99q45t_vl]

No, I mean p0330 which is ( knock sensor #2). That's the code my car gives when scanned although there is no check engine light.

Pull the plenum, and have both KS and harness replaced. As Brian says, search is your friend

[ZMARKUS]

I agree and hopefully this will be the cure all

[elwesso]

wait a minute, bot maxnix and q45tech should know the fix to this.

I have a print out of a posting dated back in 11-2-2006.

IF THE FREAKING SEARCH FUNCTION WAS WORTH ANYTHING, we wouldn't be going throught the same old sh*t all the time.

the culprit was dirty injectors, a can of BG44K did the trick. or IAC mi-adjusted, clean out the intake plenum, egr valve, and throttle body.

One must search post bodies with recent AND archived. You cant just type and go.

[Qproject]

hey guys, keep us updated on this please.

[UM97Q4.1]

Quote, originally posted by Qproject » I get a stall sometimes which triggers my "TCS traction control system" light to come on. this happens very randomly. I just noticed that I got this same thing today, when I got on the gas and looked down cause it was struggling to get up to speed, I noticed the "SLIP" light flicker about three times. Dont know if I have posted in this thread but I am having the same exact problems as others.

Just want to keep this thread alive until a cure is found.

[maxnix]

Just want to keep this thread alive until a cure is found.

One must perform the steps necessary to diagnose corrrectly and replace the defective part.

[UM97Q4.1]

One must perform the steps necessary to diagnose corrrectly and replace the defective part.

Understood, but for one with limited mechanical skills this could (and has) become very costly. Seems there are many theories out there but no solid proof that I can see as of yet. Coilpacks, harnesses, BG44k oh my!

[ZMARKUS]

I'm also noticing that my stumbling or misfire increases when the AC is on. At times it may struggle from stand still acceleration at this point. If it's the knock sensor not operating properly, than maybe the extra load from the AC makes it worse.

[LakLak]

I saw this thread and I can't agree more with you...what is the real solution to this trouble that we're all into? Did the Q45 god really has this cure? "the culprit was dirty injectors, a can of BG44K did the trick. or IAC mi-adjusted, clean out the intake plenum, egr valve, and throttle body"

Please let us know.

[djerok]

MY MECHANIC IS PLAYING RING AROUND THE COIL RIGHT NOW WHILE I PAY $50/day TO RENT A POS FOCUS. SAME SYMPTOMS AS EVERYONE ELSE. ROUGH IDLE, ENGINE "KNOCK/MISFIRE" WHEN CAR IS AT A STANDSTILL, NOT THROWING ANY CODES, CAR IS STILL STRONG AS AN OX BUT THIS CONSTANT ENGINE MISFIRE MAKES ME WANNA SLIT MY WRISTS. WHAT IS THE CURE? THIS POST HAS GONE ON FOR 3 YEARS AND NOT 1 PERSON POSTED THEIR RESULTS... PLEASE HELP. IF YOU WERE IN MY POSITION BEFORE AND NOW YOUR NOT PLEASE JUST LET US KNOW WHAT NEEDS TO BE DONE!

[maxnix]

Understood, but for one with limited mechanical skills this could (and has) become very costly. Seems there are many theories out there but no solid proof that I can see as of yet. Coilpacks, harnesses, BG44k oh my!

Why one has to study the manual, the TSB, read Q45tech's posts fully and contemplate them, and if you are still stumped, seek out a Senior Infiniti Technician.

Believe me, I am no mechanic even, but if I proceed carefully in a measured way doing only what I know how to do, I can usually deduce the problem.

Even an experienced technician has very little chance on a car that is suffering more than one neglected system. One must restore each system to as new OEM before begining diagnosis, or hope you are really lucky and wait for the next failure due to deferred maintenance on another component.

The source(s) of the problem can be different in each case, but if there is only one, it can be found by observing a disciplined diagnostic procedure and at each step eliminating one component at a time.
Modified by maxnix at 5:06 AM 4/8/2009

[Qproject]

how about stopping with your trivial remarks.

ok you and q45tech are q45 gods ok, you guys are the bomb. You guys know best.

ok now can we just try solve this problem.

your idea of bringing everything back to OEM new condition to diagnose the problem is a damn great idea! damn your brilliant!

but guess what ? it wouldn't make sense to! especially since most y33 owners are having same issue.

Why one has to study the manual, the TSB, read Q45tech's posts fully and contemplate them, and if you are still stumped, seek out a Senior Infiniti Technician.

Believe me, I am no mechanic even, but if I proceed carefully in a measured way doing only what I know how to do, I can usually deduce the problem.

Even an experienced technician has very little chance on a car that is suffering more than one neglected system. One must restore each system to as new OEM before begining diagnosis, or hope you are really lucky and wait for the next failure due to deferred maintenance on another component.

The souce(s) of the problem can be different in eqach case, but if there is only one, it can be found by observing a disciplined diagnostic procedure and at each step eliminating one component at a time.

[ZMARKUS]

I had no idea this thread has gone on for 3 years with no resolution ! I agree the clever verbal executions of those on here who supposedly have superior mechanical wisdom has had little impact on this issue. It's like an electrician explaining to a group of people how a light bulb works, but doing so in the dark because they can't find the light switch.
Modified by totaljett at 8:10 PM 7/30/2007

[bullittandy]

This thread has got me thinking. Why haven't Maxnix or Q45tech solved this problem yet?

[ZMARKUS]

Thats a darn good question and you can tell how good of a question it is by the singing crickets that have consumed this forum since. Hey, is this thing on?

[Vmo]

Personal experience:

I had these symptoms, stumble at idle, no apparent power loss, no codes. I don't really recall it being worse with the AC on.

BG44K would resolved it for about 3 weeks and it would come back.

After reading all of these posts, I figured, hey the car still works..............I replaced the Spark plugs, cleaned all the intake parts, MAF sensor, not really any difference.

Finally after 1.5 years it started to stumble worse and one day gave me a CEL, cyl#2 misfire. Switched coil with cyl.4 and a month later, CEL and now Cyl.4 misfire. Replaced one coil, original KS, car is smooth as butter.

I went through all of the hair pulling but basically, all I really needed to do was wait and the car finally told me what it wanted. It sucks, but hey - you're still cooler driving a stumbling Q than a perfectly running, pimped out Fiesta

Billy

[maxnix]

This thread has got me thinking. Why haven't Maxnix or Q45tech solved this problem yet?

I solved mine and Dennis doesn't nor would he have an FGY33.

One must read the threads to understand them.

[maxnix]

Personal experience:

I had these symptoms, stumble at idle, no apparent power loss, no codes. I don't really recall it being worse with the AC on.

BG44K would resolved it for about 3 weeks and it would come back.

After reading all of these posts, I figured, hey the car still works..............I replaced the Spark plugs, cleaned all the intake parts, MAF sensor, not really any difference.

Finally after 1.5 years it started to stumble worse and one day gave me a CEL, cyl#2 misfire. Switched coil with cyl.4 and a month later, CEL and now Cyl.4 misfire. Replaced one coil, original KS, car is smooth as butter.

I went through all of the hair pulling but basically, all I really needed to do was wait and the car finally told me what it wanted.

Billy

Glad to see another member can apply the scientific method of controlled variables to solve this problem.

[ZMARKUS]

(Your still cooler driving a stumbling Q than a perfectly running pimped out Fiesta)

Now thats golden

[ZMARKUS]

I know the next step for myself is to replace my knock sensors. I was going to do it a month back but changed jobs with downtime in between so I'm going to do it in the very near future. It's comforting to see Vmo among a few others to rise above this problem . I fill confident my day of victory is approaching as well . The weird thing I noticed from reading his experience was the misleading temporary fix BG44K provided. He could have easily assumed it must be injector related but instead a CEL revealed coil failure as the long time culprit. I say misleading because why in the hell did the BG44K provide short term relief when it wasn't the injectors in the first place .

[Qproject]

could it be the KNOCK SENSORS?

weren't these known to be faulty on the older g50's ?

what u guys think ?

thinks are getting a little clearer but not really. The bg44k temp fix seem to kinda throw things off.

my intermttent problem seems to occur when I play with parts that messes with my IDLE. For instance, when I turn on and off my AC. Since turning on my AC adjusts the IDLE.

[Q45tech]

Simple two different causes of the misfire: a lean mixture in the cylinder and a weak spark. Partially improve one defect [for 3 weeks] by cleaning up the injector, just enough spark to begin to work. Until the injector gets back dirty again from the gasolone without BG44k.

[Qproject]

so do you think the "TCS / SLIP lights" are a separate problem ? something is triggering the idle to go off in a different pattern.

what u think guys ?