A32 - 3.0v6 engine jerking

[sb3]

o worst case scenario....da 1 wt da foul plug might hv problem wt valve

Yeah i had thought of that too but most of the foreman/mechanic wouldn't recommend valve jobs on the our cylinder head coz its made of aluminium. Skimming the head would warp it. Infact i did check with TC . They told me to replace 2 new cyclinder head (V6 ) as they don't normally do a valve jobs on our cars.

 

[dream.tent]

Dream tent, but each time i checked it was always the same cyclinder(s) which are fouling the plugs. If AFM problem, which contributes to engine running too rich it will foul all of the plugs right?

Funny...

But for the sake of troubleshooting, why not swapping the ignition coils around and see if the problem follows the coil?

Wonder if there is a way to check each of the injector too. Maybe the solenoid degraded.

 

[cooper1275]

Sb3,
So finally how u solve the engine jerking problem? change the injectors (new or used and how much per no?)
or can it be clean?

change a set of used ignition coils & leads(6nos all in) from a 2001 accident model, that must have solved the problem,
anyway gys, i have sold my A32 for a good price, and cos i found the car i have been looking, bought a Subaru Sti v8-spec-C,
i will still be contributing/logging in this foum whenever i can, probably bcos i have done alot about my A32,

thanx,

 

[sb3]

change a set of used ignition coils & leads(6nos all in) from a 2001 accident model, that must have solved the problem,
anyway gys, i have sold my A32 for a good price, and cos i found the car i have been looking, bought a Subaru Sti v8-spec-C,
i will still be contributing/logging in this foum whenever i can, probably bcos i have done alot about my A32,

thanx,

Waaah, Changed your taste to monster power instead of VIP syle ? Subaru Sti is a great and tough car , i wish i can afford one, anyways good luck with your new car!

 

[sb3]

Funny...

But for the sake of troubleshooting, why not swapping the ignition coils around and see if the problem follows the coil?

Wonder if there is a way to check each of the injector too. Maybe the solenoid degraded.

Already done that and the problem stays @ the same cylinder/s. All the 6 injectors clicking away fine . (I used a long screw driver and listen to it).

 

[ctk22]

Bringing back this old thread cos i'm having similar problems lately.

Where is the injector? Kind to illustrate anyone?

Thanx!

 

[sb3]

CTK22, long time no hear fr u. just dismantle the decorative engine cover (which reads Nissan v6 3000...) and there u r , 3 injectors mounted on the fuel railings. That is only the front bank. Repeat the same thing for the rear bank. What do u want to do anyway?

 

[ctk22]

hi sb3,

i was having the same jerking while idling in gear D problem... and i tried switching and replacing a few ignition coil (trying 1 by 1) but still doesnt solve the problem, that's why i thought of getting a spare set injector from the chop shop and try replacing the injectors see whether that's the problem. That uncle dunno which is the injector and wanted me to point to him. That's why...

Have been busy with work tat's why just left those minor problems of the car unattended. But recently found tat the problems might be getting serious...

 

[weikee]

injector got problem won't be on ideal only. it will have engine "jerking" when driving also. and Plug will have difference color too.

Could be AFM, or vacuum problem.

 

[ctk22]

hi weikee,

thanx for the info. I've just changed all 6 plugs last week and the wear and tear found to be normal. Thanx for suggesting AFM and vacuum, cos actually i'm having a crack on the air filter box that i sealed it with bitumen. Maybe it's the one causing the problem.

BTW, can I clean the AFM by spraying carburetor cleaner?

 

[weikee]

i use crc contact cleaner. afm need to be NON oil cleaner.

Go buy one from a chap shop lah, is not very expensive less than 200

 

[sb3]

hi sb3,

i was having the same jerking while idling in gear D problem... and i tried switching and replacing a few ignition coil (trying 1 by 1) but still doesnt solve the problem, that's why i thought of getting a spare set injector from the chop shop and try replacing the injectors see whether that's the problem. That uncle dunno which is the injector and wanted me to point to him. That's why...

Have been busy with work tat's why just left those minor problems of the car unattended. But recently found tat the problems might be getting serious...

Before changing the injectors try listening to the six existing injectors whether they r clicking away, the one that isn't clicking might be the culprit but don't light up a cigar yet..if all injectors clicking away maybe one of the pintle valve/needle might be stuck open.

Oh Yes ! Try to thoroughly run thru all the rubber hoses from after the afm thru the throttle body to look for air leak/s . Afm & TPS might cause idling problem too. Try cleaning afm with contact cleaner but i doubt it will make any difference. If you have any friends with spare afm just do a switching test to confirm the afm problem.

Our fatty r great cars to drive especially long distance. However care and preventive maintenance must be taken to prevent the engine from having minor but irritating problems. Some of the problem really needs a pro with lots of patience to rectify if faulty but the rule of thumb is, DO NOT CHANGE ANY PART till u have confirmed its faulty. Otherwise you would break your wallet replacing the working parts. Happy hunting!

 

[ctk22]

thanx for the advice. now trying to climb up the learning curve by trial and error, at the same time can know more about this "aeroplane engine"

 

[dream.tent]

Just to understand this jerking more.

Is it happening when you are stop (traffic lights/any condition) and gear is in D?
You feel car jerks forward a bit 'like someone bump you from behind' but you can't figure or if is it the clutch slipped or engine choke?

 

[ctk22]

hi dream.tent,
initially, the jerking is like wat u've described... these few days, the jerking become noticeable even when the gear is in N.
i actually planning to try cleaning the AFM using carb cleaner as found in other threads in this forum. but i also suspect there's something to do w the valve/pump thingy (sorry, dunno wat's the name), it's connecting the air filter box to the engine. i suspected tis bcos there's hissing sound at tis valve/pump thing, as if there's air leak, at tis valve. my readings tells me tat tis thing actually acts like a pump to create vacuum condition to the engine. correct me if i'm wrong. it's not confirmed yet though. i have to test it out first.

could the knock sensor faulty cause similar problems like tis?

 

[weikee]

make sure the carb cleaner is NON oil based. else say good buy to the afm.

 

[seizai]

hv u try any injector cleaner? those like treatment which mix with petrol.

 

[dream.tent]

hi dream.tent,
initially, the jerking is like wat u've described... these few days, the jerking become noticeable even when the gear is in N.
i actually planning to try cleaning the AFM using carb cleaner as found in other threads in this forum. but i also suspect there's something to do w the valve/pump thingy (sorry, dunno wat's the name), it's connecting the air filter box to the engine. i suspected tis bcos there's hissing sound at tis valve/pump thing, as if there's air leak, at tis valve. my readings tells me tat tis thing actually acts like a pump to create vacuum condition to the engine. correct me if i'm wrong. it's not confirmed yet though. i have to test it out first.

could the knock sensor faulty cause similar problems like tis?

From what i hear so far...I think:
1. something to do with fuel feeding to the engine. (Check if fuel filter if clog..or fuel pump?)
2. ignition coils/high voltage cord. You have 6 individual ignition coils and might have voltage short to the block and didn't fire the spark. (OBDII might be able to tell if you have miss fire)
3. I don't think AFM could be the issue. If it's dead, will be stay dead and won't be intermittent..(If AFM dead, you can start engine but will die off in a second or two with engine check light on. You can just disconnect the AFM connector at the intake box to put your car in 'take me home mode'.)

This is what i can think of now....hope it helps...

 

[weikee]

Dream,

My AFM when about to die sometime stall my engine, and my O2 reading on lifting throttle @ 1,300 (+- 200) rpm, it give 11 - 13 reading... after changing it give back normal reading.

 

[ctk22]

seizai,

u mean clean the injector using petrol? I was thinking to....

thanx dream.tent for the suggestion.

i've changed fuel filter last month, but i'll check the fuel pump.

the most possible problem now is the iacv-aac valve, cos there's hissing sound from there, as if the air is leaking.

the problem is becoming serious day-by-day, and it even stalled the car when i step shift to D and step on the pedal. I have to step the pedal harder so that the engine in higher revv, then it wont die.... :hmmmm:

btw, is the fuel pump accessible from rear seat?