Random Stalling?

[nizmo_freek]

Hey

Not sure if i should post here or in the skyline section, but i just went for a drive and while rolling at about 90kmh in 5th, take my foot off the throttle, put the clutch in, ease on the brake then all of a sudden it stalls, all lights on the dash come up, no power steering, it has been doing the same thing since about a couple of weeks ago just randomly, normally the revs just drop right down and then come straight back up to idle but this time it completly stalled, the car runs fine when coming to a complete stop everywere else, it just seems to do it at the same peice of road just before my house (no, im not saying the road is causing it lol). any ideas on what could be causing the problem? its not a vaccum leak cause if it was it would stall while its idling, im running the stock bov ,im stumped as to what it could be, O2 sensor of afm maybe?

I could plug in my PFC and do a sensor SW check and get the reading of all the sensors? would this tell me anything?

Any help would be much appreciated!

Cheers

[Spook's_Skyline]

sounds similar to my car

would hestitate at any revs and any time

stalls, and wont start for a few turns of the key, then drives normally

im replacing my afm, if i watch the graph vs afm signal, im getting vertical drops in the signal randomly

[Syphon]

Presuming it's a standard ecu, do a diagnostic on it, or consult

Could be a faulty TPS or as said, dodgy AFM signal...

[MBS206]

It could also be a slight air leak, as mine was doing it with a tiny slit in a pipe, but wasn't giving a rough idle.

[SilverECR33]

what if it is the road?.. It could be haunted..

[700HP-GTR33]

what if it is the road?.. It could be haunted..

Do not take this as a joke.. .

Some say that there are certain places on the Earths surface that have a magnetic anomaly...

(A word I have always wanted to use)

This causes cars to stop..or..electrical faults to occur.

It can also cause drivers to fall asleep or faint at that point..causing major problems...even accidents.

These spots can change or can always occur constantly at one point. :laughing-smiley-014:

Heard of the Devils Triangle?

This can explain..all of the faults we experience in our cars.. and we can blame these anomolys(twice in one night..yippi)

I am not in anyway in charge of myself at this point..so whatever I have said should not be held against me.

Written and authorised by M J..Mc Dougan..Canberra..LMCT 1234....conditions may apply......

[700HP-GTR33]

Hey

Not sure if i should post here or in the skyline section, but i just went for a drive and while rolling at about 90kmh in 5th, take my foot off the throttle, put the clutch in, ease on the brake then all of a sudden it stalls, all lights on the dash come up, no power steering, it has been doing the same thing since about a couple of weeks ago just randomly, normally the revs just drop right down and then come straight back up to idle but this time it completly stalled, the car runs fine when coming to a complete stop everywere else, it just seems to do it at the same peice of road just before my house (no, im not saying the road is causing it lol). any ideas on what could be causing the problem? its not a vaccum leak cause if it was it would stall while its idling, im running the stock bov ,im stumped as to what it could be, O2 sensor of afm maybe?

I could plug in my PFC and do a sensor SW check and get the reading of all the sensors? would this tell me anything?

Any help would be much appreciated!

Cheers

Get a second hand AFM....

If that does not fix it......try changing your TPS...then sensors as a last resort..unless you can get them cheap..

You will need to change your tps.....in the short future anyway..due to age of car.

It can also be an electrical fault..or computer is playing up..some can get that way...If you can find one to plug in..second hand and see if this fixes it.

Could also be pressure drop in fuel...check your pressure lately?Or injectors get sticky....and clogged..try some fuel additive......EDITED:(This is an add on).

[nizmo_freek]

So you guys reckon afm? im thinking that aswell, the car does hesitate and surge somtimes but nothing to major, just seems weird that all of a sudden it has got a problem, might take it into nissan and see what they think

[Mr Jollwah]

Mine was doing this, Checked my afm for cleanliness and noticed it was covered in grime and air filter oil. Cleaned it out with brake kleen and all is well again.

[700HP-GTR33]

So you guys reckon afm? im thinking that aswell, the car does hesitate and surge somtimes but nothing to major, just seems weird that all of a sudden it has got a problem, might take it into nissan and see what they think

They know jack shit...trust me.....

get a second hand one...try it and see if it fixes your problem

[nizmo_freek]

They know jack shit...trust me.....

get a second hand one...try it and see if it fixes your problem

Yea i think i will just do that, or buy a cheap 2nd hand one, i dont want to buy a brand new one as i need to get my z32 afm in the future anyway, it happen again today by the way, ive checked all the pipe for splits and lose hose clamps but everything is fine, ive checked all the intake pipe setup and bov return line aswell and all is fine, so im leaning towards it being the afm, would a faulty afm cause it to only stall randomly ,if the afm was fauly wouldnt the car run like crap??

[nizmo_freek]

Bump, anymore ideas??

[VB-]

i would first check for any possible leaks, check vaccum hoses just to be sure, next up would be the AFM. does the PFC have any sort of diagnostics?

[nizmo_freek]

Ive checked all the intercooler piping, intake pipe and bov plumback line, vacuum hoses and tightened all the hose clamps ,everything looks fine to me, im running the stock ecu at the moment, but if i have to i could plug in the PFC and see what the airflow voltages are while im driving.

Is there anyway i can test the afm to see if it is faulty? would a dry solder/joint cause the problems im having, i thought that a broken joint/solder in the afm would cause the car to run completly crap and hardly drive at all?

cheers for all the help, would be great if i could get some more opinions

[Spook's_Skyline]

if you have pfc plugged in just graph the afm signal

with mine, its a nice curve, and then, a vertical drop to nothing when it starts playing up

very easily seen and diagnosed

[delljit]

Mine does this as well, stalls when coming to a stop from 3rd/4th/5th. When it dies, power steering goes away, brakes go hard, all the dash lights go on etc. Mine is 100% stock so it isnt a bov issue. I need to get this fixed because i cant use the brakes properly when coming to a stop since they harden.

Would a dirty afm cause this sort of stall? Im pretty sure the battery might need replacing too, because when i bought the car it had been sitting garaged for quite some time (long enough for the battery to die).

What else can i check? Searching the forum also suggested aac lines but im not confident enough to check it out myself just yet. The car will have to get a roadworthy in a week or 2 anyway so i can atleast tell the guy about what is happening. It only started doing it this last week; it was fine before that and passed a rwc last month.

I havent really driven it since it is unregistered. (only to and from vic roads)

Also, i was told just before i boguht it, it may need injector cleaning; would carbon build-up cause something like this?

Im just trying to narrow it down.

edit: stalled about 3 times to vic roads, maybe twice or 3 times on the way home

r33 96 gtst s2

Edited August 13, 2007 by delljit

[delljit]

[4drftn]

is it hard to start at times? i had the same problem with my vs commodore just driving along and just shut off and all the dash lights will come up... in the end it was the crank angle sensor... get it checked out

[delljit]

It starts first time always; although it does make a sort of high pitch noise for a second or 2 when i start it sometimes after its been sitting for a day or so.

Guess ill just have to get it checked out; i wouldve liked to solve it by myself though.

[nizmo_freek]

Bit of an update

Just bought a 2nd hand recondition AFM, changed it over today and no difference at all so im a bit stumped, i can actually make the car stall on purpose, for instance i can be in 5th gear at about 90kmh,give it a bit of throttle then just before it starts boosting, put the clutch in and put the brakes on slighty (it dosent stall without the brake not being on) and the revs will just drop and car will stall, it likes it just cant catch its idle.

Anymore ideas on what it could be? the car runs great apart from this problem, not sure what to check next, 02 sensor? idle valves? TPS???

Might plug my PFC in on the weekend and check the TPS values etc etc

Any more help would be awsome, cheers guys.