engine sound rattle

[suby01]

so its 0-10 degrees here and when i start the car i always warm it up before driving cold or hot temp i wait until the rpm drops to 1k.

its wierd, even with the car warmed up letting it get to normal temp.. it will idle fine once i put it into gear D or R it starts making that noise then i drive it for 20-50 ft and it stops.

and this only happens when the car is cold and when i start it up first time.. after turning it off and starting it up again it wont do it.

it does it at about 1k rpm. i dont know if it can be something with the pulley, i checked my oil the level is good, my engine coolant is very low however, can that have something to do with it.

id like any input first before i take it to the dealer i know that they wont warranty it and shaft me in the end.

heres a clip

[tollboothwilley]

Replace the lost fluid in the coolant reservoir. Let it run and see if it does it the next day.

I have had mine make a weird noise twice. IT was on a VERY cold start, around 0* and I hadn't driven the car in almost a week.

Your sound seems pretty loud. IF its not a recurring sound every time you start up the car I wouldn't worry about it much. If it starts making that sound each time you get in your car I would take that right in.

You said that it only happens the 1st time in the day, overnight. Is your car outside at night? Once the weather warms up I doubt you'll have the issue.

Make sure to keep those fluids full though. If you get air in that coolant it can be a PITA to bleed out.

[Sentientbydesign]

It might be transmission or diff related as they won't warm up without movement (not sure how applicable that is to the auto though as the torque converter will likely be spinning regardless).

[suby01]

my cars garaged, but regardless if its in the garage or not when i start it up initially it will do it. then when i turn it off and let it cool down no matter it will do it again. but it wont do it once its warmed up and i shut it off and turn it back on immediatly only on the first warm up.

i talked to another G owner he had the similar problem as far as sound and he said it was the crankshaft position sensor that went. any ideas to this?

[smockers83]

You didn't do a diesel engine swap did you?

No clue. That is pretty loud.

[pfarmer]

my cars garaged, but regardless if its in the garage or not when i start it up initially it will do it. then when i turn it off and let it cool down no matter it will do it again. but it wont do it once its warmed up and i shut it off and turn it back on immediatly only on the first warm up.

i talked to another G owner he had the similar problem as far as sound and he said it was the crankshaft position sensor that went. any ideas to this?

I agree with the above poster about refilling the coolant. Now the question is why is the coolant low. To me it sounds like a pump, more like a positive displacement pump than a centrifugal which would eliminate the water pump which leaves you with two or three others.

Does your air conditioning work? Try putting it on full when the noise is present and see if it goes away (or for that matter turn it off if it is on). It sounds a little like an older car I had with a bad compressor pulley.

Perry

[suby01]

no it doesn't matter if its on or off the heater and ac work all good. the sounds only like that when i put it into gear while standing with the break on, other than normal driving it stops.

[tollboothwilley]

I would guess water pump considering your coolant level is low. You haven't noticed fluid dripping in the garage have you?

Did you fill the coolant up to level yet?

[pfarmer]

no it doesn't matter if its on or off the heater and ac work all good. the sounds only like that when i put it into gear while standing with the break on, other than normal driving it stops.

So you are now saying it doesn't do this only when in gear with the brake engaged?

That changes a lot of things it could be. Time to cut up an old garden hose and go hunting if the sound bothers you.

Perry

[suby01]

dude what? it starts right when i put the car into gear D or R. i do need to press the break to shift out of park. and it does it at 1k rpm. so i dont know what part of that was confusing or didnt make sense.

willy..no i didint im taking it to the dealer next week to have them tell me wtf is up. and see how bad then bend me over. instead of me getting some mobile AF ill just have the dealer do it up official w.e.

[Sentientbydesign]

Unless your mods are causing it, everything should be under warranty. Why do all of you fear the "$tealership" while under warranty?

[pfarmer]

dude what? it starts right when i put the car into gear D or R. i do need to press the break to shift out of park. and it does it at 1k rpm. so i dont know what part of that was confusing or didnt make sense.

willy..no i didint im taking it to the dealer next week to have them tell me wtf is up. and see how bad then bend me over. instead of me getting some mobile AF ill just have the dealer do it up official w.e.

You may want to try the 'dude what' somewhere else.

You wrote the following:

'no it doesn't matter if its on or off the heater and ac work all good. the sounds only like that when i put it into gear while standing with the break on, other than normal driving it stops.'

You stated it sounds like that 'only' why you put it into gear while standing with the break (brake) on.

Now I did go out and started mine up cold just to listened to it. It makes a similar noise but very low level. As it warms up that goes away as soon as the thermostat opens.

Others have mentioned noises from exhaust shields, etc. The reason I stated it didn't sound like the water pump is because the type of pump it is. On the other hand if the pump was cavitating it will start to sound a little like it has some marbles in its casing. If the sounds changes frequency (in the upward direction) with rpm then I would eliminate a thermostat which is rattling as my experience is they tend to quiet down with increased pressure and then go silent when open.

A short length of garden hose may be your best friend here if you want to track it down prior to going to a dealer.

Perry

[suby01]

dude what?

[tollboothwilley]

LOL

You should be under warranty for your car and shouldn't have to pay for anything. Mods on you car cannot void warrranty of work unless proven to be the cause of failure. Still sounds like water pump/thermostat area to me as this is a warm/cold issue.

The garden hose thing he was talking about was the resonating sound coming up through the hose when you stick one end on a piece of engine and the other up to your ear. Kind of like the 2 cans and a string thing. It can help you isolate the problem to a location.

[pfarmer]

LOL

You should be under warranty for your car and shouldn't have to pay for anything. Mods on you car cannot void warrranty of work unless proven to be the cause of failure. Still sounds like water pump/thermostat area to me as this is a warm/cold issue.

The garden hose thing he was talking about was the resonating sound coming up through the hose when you stick one end on a piece of engine and the other up to your ear. Kind of like the 2 cans and a string thing. It can help you isolate the problem to a location.

This is one part that seems to go against the water pump/thermostat idea:

'its wierd, even with the car warmed up letting it get to normal temp.. it will idle fine once i put it into gear D or R it starts making that noise then i drive it for 20-50 ft and it stops.'

It seems that if it was engine temp related it would have disappeared when the engine was warmed up to normal temp as stated above. I'll have to go back and see if this is a sedan x. Sort of wondering if what we are hearing is more drive train related which clears up once the car is move. Would be interesting to see if the noise would change by pushing on the engine side to side when it is making noise to see if the noise changes. I did have a half shaft make noise when sitting still on another car.

And certainly if under warranty take it in. Problem is it may have to be left until the car cools back down.

The hose thing works well, either touching the part or just roaming the area. My dad used to use a long steel rod on older cars where you could more easily access them.

Perry

[suby01]

so took it to the dealer this morning went to dunkin 50 feet away from the dealer while pulling out from the parking lot it was still doing it. parked at the dealer..went inside got the paper work..ok lets hear the noise start it up nothing. turned it off on again nothing.. WERGWESDFJIBSDFHBEIT#%HYV( ETRBNEH*(SYSW#(T*G# YHWE#*(@%TR( #@T#(YHI*YE$HBWE$HBwaited 30 mins at the dealer started back up nothing.

ended up leaving it there for the day see if it comes back.

[suby01]

ok so got a call back from the delear and like i said. HA

they were able to duplicate the sound. and guess whats causing it. the pulley since it is not a oem part it is not covered and i can replace it back to stock and see if it makes the sound again.

although i explained to them that i know another completly stock G had the same noise and it was the crankshaft position sensor. which was replaced.

[tollboothwilley]

How can they verify its a pulley?

They are just blaming it on the pulley since that is the only aftermarket part in the area.

I raise the BS flag too

Go back to stock on the the pulley and when it does the same thing take it back in to make them fix it.

Did they charge you?

[suby01]

as for the charge i dont know yet. im picking it up in a few hours. they probly will.

so you think i should change it back to stock and see it then? or just live with it. because then id have to take it to the shop additional $$$ for the switch over and then back again to the same thing. ishh sucks.

[zozoka1212]

If they charge you change it back to oem and take it back with the rattle and ask yor money back. Hard to believe it is the pulley.

zozo

[suby01]

ya that was their answer. now after thinking about it. honestly once they took the car up to the lift i dont think it made the noise or did they even hear it. as soon as they saw the pulley it was a wrap and they just said ok. thats the fault w.e

because honetly while i was there for half the day it ran perfect nothing irregular. so they didnt hear anything then a couple hours later once the took it into the shop and looked under the car and their like ok its the pulley so thats their excuse and thats it. no need to look further and since they didnt bother looking.

also they better fill up my coolant bottle. with the oil change it should be included see how that goes.

infiniti G=win.infiniti dealers=fail.

[4drsleeper]

I'm with everyone else...sounds like a transmission issue. I would think that if the pulley is causing the problem it would make the noise while warming up, but it doesn't. But the noise doesn't start until you put in gear, regardless of engine temp.

[suby01]

ok well at least they didnt charge me. i went to a different dealer about 20 miles away as the the one i always go to thats about 7. that one would of for sure charged me for my diagnose.

they did say that i am the first car g35 sedan with any parts on it they all liked the way it sounded bla bla so gave me a hugass ego and a grin.

he told me they didnt call tech line hes like if you want we can but thats gonna save you time and $$. because once tech line is called first question they have any aftermarket parts in that area they say yes, and the infinititechs dont know where to go since all they look at is that.

this is what they wrote up.

"found car to have aftermarkets parts including stillen in take aftermarket converters with rear 02 sensor extensions and aftermarket under drive shaft pulley. aftermarket parts possible causing noise car needs to go back to stock to diagnose noise."

im thinking like i said its the crankshaft sensor. if i bought it from them paid them and have them install pay for all that, and then if it stop to have the warranty it? orjust dont waste my time and go back to the tuner and have them put the stock one on and then see the end result. they said once i put the stock one on it should come back within a day. so yah

[tollboothwilley]

how much did they charge you to install that crank pulley?

You can do this yourself. Its not that bad.

[suby01]

70 bucks thats real cheap umm thats because i got it done through the tuner that was supposed to do the cobb tune and everything else. but now im sure itl be more. i dont have a lift or the tools to do it.

[4drsleeper]

I was charged $75 for my UR pulley install. I can't see paying much more than that.

[tollboothwilley]

I did a write up of the install. You take a look at it? You don't need a lot of tools for this install.

[4drsleeper]

I wonder if your best option at this point is to drive it until it breaks. If you really don't (and I don't either) think it's from one of your mods then I would just drive it till it breaks and save yourself some money by swapping the pulley.

[4drsleeper]

Suby, What's the latest with the problem you are having?

Also, what about that dyno?

[suby01]

the rattle its still doing it.. im waiting for it to warm up so next few weeks, and see if its still doing it has nothing to do with the temperature then i will take off the pulley and see it then. for now i love the power that it made its ridiculous. im not going to dyno it until i get a chip/tune. the pulley doesnt make much hp..just frees up current hp.