wtf is the problem

Post by **916drifter** » Mon Dec 15, 2003 7:14 pm

its kind of thick i dont know really cuz i checked it at night. i just got brand new oem exhaust manifold, so would it have come with a new gasket? ill check today, b back later

Post by **916drifter** » Mon Dec 15, 2003 7:14 pm

ok i just checked it and its white smoke at the start then it turns gray. so is it unburned fuel? and where is the ground for the MAF. i only found 1 ground wire and the was by the firwall below the windshield.

Post by **Dattebayo** » Mon Dec 15, 2003 7:14 pm

headgasket, not exhaust manifold gasket guy... ground is usually green or black.

Post by **NISTECH** » Mon Dec 15, 2003 7:14 pm

that sounds like rich mixture. you will need a vlot meter to do the ground check . do you have one?

Post by **916drifter** » Mon Dec 15, 2003 7:14 pm

no i dont and how would i check it? or should i replace the ECM like my mechanic said i should do first.

Post by **NISTECH** » Mon Dec 15, 2003 7:14 pm

its not very likley its your ecm. they dont burn out all that often. did you go to a independent shop or a dealer?

Post by **916drifter** » Mon Dec 15, 2003 7:14 pm

i went to an independent shop. but my mechanic checked my whole car and he said most likely the ecm cuz he had another nissan with that problem im haveng. and thats what fixed the other nissan.

Post by **NISTECH** » Mon Dec 15, 2003 7:14 pm

I see to many mechanics make that call and be wrong. I dont know how skilled a mechanic he is and weather he has any real technical ability. A mechanic can rip a car apart and put it back together like nobodies buisness. The problem is alot of mechanics arent very good technicians. They need to break out the vantage or fluke DSO and watch these signals being sent to the ecm and determine if they are with in expected parameters. he says he has checked your whole car so ask him to see the back of the repair order and see what he wrote down for measured voltages verses specs. look at O2 rise time and sweeps per sec. max and min voltages on it. Also how does the accel pattern look for the airflow meter on the DSO? Fuel injected,emission controled cars are no longer simple mechanics,they are very technical that is why you need a technician working on them instead of a mechanic.

Just about any smog tech with an enhanced smog license is your best source for repairing any computer controlled car built after say 81 or 82. I am not in any way trying to degrade your mechanic since I have no idea what kind of back ground he has. and it could be you are just simply mistating his title. I am mearly telling you what is involved with this type of diagnostics since the car physically runs good ,it is mearly using to much fuel.

Post by **916drifter** » Mon Dec 15, 2003 7:14 pm

So should i take my car to a smog place? and ask them to check the signals being passed to the dcm. if so i will probably do that tomorrow. cuz i was going to buy a new ecm tomorrow. but if it is wrong signals, what has to be done?

Post by **NISTECH** » Mon Dec 15, 2003 7:14 pm

that component will be the failure.

but heres the deal with the ecm. if he is willing to install it and garantee thats the fix. by all means let him get the ecm and install it. if it does not resolve the problem he will need to remove it and not charge you. the problem here is if he is good at what he does he may be right and thats whats wrong with it.

I am trying to tell you to go to him and ask him how he came to the conclusion its your ecm,have him prove it via diagnostic notation on the R.O. I am not telling you to run from this guy. I am telling you to verify and understand exactly what is wrong with your car that leads him to believe its your ecm. so you are more confident in his diagnostics. I have people come in to the dealer all the time saying I read this or that on the internet and thats whats wrong with my car.

Its kinda funny seeing that I do this site here, but my first reaction is "oh god here we go again,another one of these"I got it off the internet so it must be right" type of people"

I am sure if you go to him and tell him you talked to someone on the internet and say they said "blah blah blah" you would just aggitate him. but if you must just tell him you talked to a tech from a nissan dealer here in the sacramento area. that would be me. then he might be a little different about it. just leave out the internet part. its kinda like going to the doctor and telling him you have cancer cause you have the same symptoms you read about on the internet....lol you know what I mean?

Post by **NISTECH** » Mon Dec 15, 2003 7:14 pm

here thought this might intrest you too.

http://www.nissaninfiniticlub....45913

Post by **916drifter** » Mon Dec 15, 2003 7:14 pm

yea i know what you mean. lol but ill go talk to my mechanic tomorrow and let you know what happens. but he is a great mechanic. he is always wanting to tune my car for drift and track racing without my dad knowing. but he came to that conclusion becuase for the past couple of months hes worked on the outside of the car and test drives it. at first he thought it was my exhaust cuz its a striaght pipe but then i went to him the other day and told him about the "driving 50miles like a granny, and losing 1/4 of my tank" so he said it may be the ecm. the only thing i havnt changed was the rotor and cap. and my step dad said it might be that, and its not producing enough volts for the new wries/sparks.

wtf is the problem

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