R32 Gtr Issues

[MP_R33]

Hey guys,

Lately my GT-R has been a bit strange.

I will go for a drive and when I arrive wherever I am going and park the car. While it is in neutral the revs are very unstable it will just go up to around 1500 then drop to around 400. It used to be every 3rd day but it is becoming a daily occurrence. Even whilst driving now sometimes when on the throttle it cuts out a little.

I am just trying to figure out what it might be or what it sounds like to you guys.

I just done a major service, I am thinking what to try and replace next. I am thinking of doing coil packs and AFMs

Does anyone have any advice?

Ross

[Nee-san]

Try cleaning the AFM and report back.

[MP_R33]

What do you mean by cleaning?

Do you mean the plug, like get a cotton but and wipe the terminals?

Ross

[DAS KAMU]

spray the wire inside with a can of electrical contact cleaner spray available from dick smith jay car etc etc

[MP_R33]

So do you mean the wire in the center of actual AFM or the connection from the plug to the AFM?

[Moodles2]

The sensor wire inside the shell of course

[NSNPWR]

Does it miss or just hunt around? Running a PFC?

[MP_R33]

Just hunts around a little. Maybe beginning to miss.

[DAS KAMU]

did you spray

[MP_R33]

Will be doing it first thing tomorrow. It is temperamental though so probably wont know If it has worked for a while

[Nee-san]

Yeah mate,

Spray the element (inside the gauze) with AFM or contact cleaner be careful not to touch anything but the actual housing of the meter itself.

[blind_elk]

Hunting idle like this is usually the AAC (or maybe more correctly IAC) valve. It probably needs all the carbon crap cleaned out of it.

[gtr fan]

I have a similar problem and have been told it is most likely the inlet manifold gaskets.

Might try the electrical contact cleaner on the afm's. Do you need to remove the mesh screen first or can you spray through it?

[SiR_RB]

Just spray through the mesh no need to remove

[R31Nismoid]

doubt its a dirty AFM, more likely one on its way out.

exactly what my cars have done in the past with failing AFM.

[heller44]

Had similar symptoms to you.

Cleaned AFM's, sorted all piping for vacuum leaks, ended up being the manifold gasket around 5-6 cylinders that had blown out. Found by spraying brake cleaner around the manifold joints and the idle stabilised.

Replaced gasket with a new nitto metal set. Good luck with that though, painful job.

[CGB_R32]

doubt its a dirty AFM, more likely one on its way out.

exactly what my cars have done in the past with failing AFM.

This. To test turn the car on jump out and give each AFM a shake one at a time, if it begins to hunt after the shake i'd say the joins inside the AFM have worn. Search "soldering AFMs" and there is a DIY on how to do it - fixed my hunting / idle problems.