My 300Gt Has Malaria...............

[NISMO-61]

Hi everyone,

One issue after another. I have lost the count but anyways.....

This new issue is a bit interesting. I used to have ticking/ rattling noise coming from the damn variable valve timing unit. during the last few weeks that annoying sound has gone for good. However we have a different issue now.

When the car idles, especially when warm, it shivers, shakes just as the idle RPM is too low and it's going to stall. However the idle RPM is pretty normal (around 600rpm) and although the car shakes like it's having an orgasm, it doesn't stall.

When you stop at the lights, it happens. when you take off, the car goes nice and smooth.

What might be the issue guys?

I kind of like it as it functions like a massager.

[White GTS-T]

Vacuum leak

[NISMO-61]

where should I check?

[White GTS-T]

Around the intake manifold, throttle body, vacuum lines etc.

[NISMO-61]

first thing tomorrow. Thanks for the info. appreciated.....

[White GTS-T]

If it's bad enough you may be able to hear it. A stethoscope may be useful here. Otherwise just spray some silicone spray, or an equivalent accelerant, all around the intake, piping etc and listen to hear the idle speed pick up.

[=CPV35=]

nah mate, that is your "fuel damper"

you can only hear it from the inside of your car right? not from the outside?

and it seems to be coming from behind the dash right?

if you put your hand on the fuel damper in your engine bay you will feel it shake, that is the cause of your problems.

I had this exact same problem and got it fixed, new damper cost about $90....easy install just gotta jack the car up.

[=CPV35=]

does it sound like a diesel? and when you put your hand on the dash you can feel it shake?

99% it's the fuel damper

[NISMO-61]

It does file like the car is kind of a massage chair. the whole thing is simply shaking. It's like a huge vibrator.

I have recently changed the fuel pump but not sure about the dumper stuff.

The car shakes but doesn't stall and when you accelerate, it runs nice and smooth.

As I said it feels like the idle rpm is low, but then it should stall right? this guy doesnt stall at all. When you are at the lights, right before you take off, if you touch the accelerator gently, it almost stalls and than as your foot goes further down on the pedal, it picks up momentum.

To make the long story short, no stalling. shivers like a massive vibrator (If you place a cup of water on the dash board, it might spill around), car runs smoothly after take off. That's all I have in hand.

As I mentioned in my first e-mail, before this issue merged , I had a problem with the Variable valve timing shit. It was ticking between 0 to 2000rmp. now that ticking is gone. I don't know whether these problems are related or not.

I think the Variable timing unit clicked something sensitive, and now the car is having orgasm....

[=CPV35=]

did u fix the vvt or did it just stop by itself?

if u fixed it, the mechanic might have knocked a hose loose or forgot to tighten a bolt somewhere thus causing a vacuum leak which can have the same effect as you described above.

if u didn't touch the vvt and it just went away itself...then I reckon it's your fuel damper gone bad thus causing this new problem you have described.

[NISMO-61]

We havent touched the vvt as it would cost 3.5k. I changed the intank fuel pump. Where the hell is the fuel dumper and where do i get it. I believe i can do it as i changed the fuel pump by myself.

[NISMO-61]

The car used to have stalling problem as well. That's why I changed the fuel pump thinking that it might be the reason. However the issue was still there after changing the pump.

I might try to replace the fuel pressure damper to see if it makes any difference.

Any part number for the fuel pressure damper for 2001 300GT V35 VQ30DD engine (direct injection)

[NISMO-61]

Just wanna ask one more question, If there is a problem with the fuel damper or pressure regulator (are they the same thing or what?), do you think the car shakes all the time or just when idles?

Because in my case, the car shakes only when I stop and it idles. when I accelerate there is no problem at all. The car runs nice and smooth.

[scotty nm35]

I think I have the dampener here on my spare 2.5dd if you want a cheap one. Have you priced it from Nissan yet? Could be the HP fuel pump too I guess.

It would be good if you could get a fuel pressure gauge on the high pressure side, that would prove if the dampener and the pump are faulty or not.

[NISMO-61]

Would a stuffed up ignition coil pack would cause this kind of vibration in idle?

[White GTS-T]

It's extremely unlikely that an ignition coil will misfire only at idle and not under load. Have you checked for a vacuum leak?

[NISMO-61]

it seems like there is no leak. I took it to the Nissan Service centre. They came up with a list of error codes starting from the crank shaft sensor, 2 of the cam timing sensors and mass air flow sensor. At the end of the list it says $1434.00 including the labour.

2 V-cam timing sensors supply and fi $700

Crank shaft sensor $348

Mass air flow sensor $386

they cant even say whether it's going to fix the problem or not.

I was driving home today and the damn thing stalled. I pulled over and tried to restart....not a chance.

I got out to get some fresh air and after 10 mins, I got back in and it started.

I'm sick and tired of this car but I just cant throw it away.

I had gone to Nuwan before when I had that ticking noise from the engine (variable valve timing stuff I had mentioned before). He came up with a longer list of things to be done. At least he can tell me that what he is going to do is going to fix the problem. On the other hand he will replace a lot of things to sort it out. his list costs $ 3600

[PN-Mad]

Lol. Why not see if the sensors are the same as vq35de, as they are available from the US at better prices. Change them for yourself and find out.

The sensors can be bought for $75 or there abouts each.

Nissan can EAD.

[scotty nm35]

I has sensorz, and I wouldn't charge $700 to change them... Or $3600.

[NISMO-61]

I was going to bring it to you Scotty, but I mentioned earlier the ticking noise disappeared when the vibration started. Changing the sensors is not an issue, but the questions is will it solve the problem. if that ticking noise was affecting the timing, then it would be normal that the sensors were delivering wrong signals which might mean there might be nothing wrong with the sensors.

Even if the sensors are changed, I strongly believe that the problem will be there.

I'm really confused.

At least Nuwan gives me warranty although the list he came up with is long and costly.

I have just purchased roadside assistance, just to make sure.

I'm planning to go overseas, so cant invest any money on it now.