engine jerking... b16a

[arrowhead]

Ok no repairs done yet but I'm pretty sure I know how to engge the jerking.

2/3 gear. 4-5k rpm. Accel abit then full release then full throttle. Make sure u hit the ground. The car will most likely jerk. About 70% chance.

Haih. Seems to me like it's fuel related. Will get diff opinions from 2-3 famous workshops tmr. Wish me luck.

 

[D-IV]

How come i got a feeling there's something wrong with your fuel regulator

 

[arrowhead]

noted. will get it checked also tmr...

 

[E-Tech]

I am wondering now.....is that normal way of driving?
20% throttle then 30% throttle then 0% throttle then 100% thorttle then jerk jerk jerk...
"Knocking" or not when you do that?... oledi adjust distributor?
If fuel related then something is not responding fast enough to compensate the sudden full throttle.... too much/not enough fuel???
Stick a wideband 02 af meter and go for a drive.,, innovate or dynojet- ur pomen hv?

Your injectors and throttle all standard sizes?
O2 sensor running close loop or open loop?
Haiyo...sakit kepala.....
By the way... I manage to "cure" another ecu today....P08 with chip....

 

[D-IV]

It might not be the normal way of driving but depending on gear and rpm, the engine won't jerk if what arrowhead way of driving is as described. But If 4th gear at 1000rpm and full throttle the jerking might be fatal which ofcourse is a knocking issue and is what we shouldn't be doing anyway haha.

His engine is closed to stock and running on stock ecu. Would a stuck fuel regulator cause this? High vaccuum, fuel regulator valve open to release pressure (or maintain stock pressure at the rails), then sudden 100% throttle, fuel pressure drop (due to stuck fuel regulator) and after a while the pressure goes up again coz the fuel regulator slowly returns back.

It might be possible.

 

[arrowhead]

its not a normal way to drive, but sometimes we drive like that, like maybe when u rolling start with a friend...

hehehe but either way, the jerk shouldn't be. last night i backside itchy, drag with my friend. at 4th gear, full throttle engine also jerk like no tmr, futhermore, at 1 point, my car felt like no power... (seriously i think its fuel as D-IV mentioned) cuz my car's rpm was stuck at like 5k, even at full throttle, the rpm didn't rise..

no, my foremen dont have innovate or dynojet.. he cheapskate LOLOL!

 

[E-Tech]

wah, sound like getting more serious.....
If you car got adjustable fuel regulator and the meter then easy to check the pressure lor...
but if do not have hopefully you pomen have the meter so that can temporary hose it to your return fuel line to check the preassure to see the pressure at different rpm...
Or paling senang exchange test fuel regulator with a friend's car to confirm this item first...
Still cannot then tukar half cut ek9 fuel pump...

by the way Vacuum pipe semua okay? Crack ke, bocor ke....

 

[apex262]

bro, hv u check TPS?.i think someone did mention earlier...
my car was jerking oso past few days..normal cruising 3.5k-4k rpm felt like insufficient fuel
then 2day my mech adjusted the TPS and everything seems normal again..few cars at d wshop oso got d same symptom, n all TPS related..me hwver still need to monitor d car in case it jerking again..good luck

 

[arrowhead]

e-tech : will try that next visit

apex: yes i did. today i tried another tps and map sensor... also same results..

=(

i think i need to go halfcut shopping adi.

yesterday night i test tekan with my friend, 3/4 gear jerk jerk jerk car like no power.. zzz

 

[D-IV]

Stop beating the car. You don't want to spend on buying another engine or fixing a blown engine.

 

[arrowhead]

cant help it. it annoys me to that it jerks.

 

[skf]

e-tech : will try that next visit

apex: yes i did. today i tried another tps and map sensor... also same results..

=(

i think i need to go halfcut shopping adi.

yesterday night i test tekan with my friend, 3/4 gear jerk jerk jerk car like no power.. zzz

i also got tis experience , when full throttle , engine will jerk , found out that my halfcut fuel tank already karat dirty fuel make my engine jerk
so maybe u also can try to check your fuel tank

 

[arrowhead]

good advise. something we've all missed out. will get it check this week!

thanks for all the advise/opinions guys.

really helps in my troubleshootin.

 

[pencalat]

still got hte prob ka mr arrowhead... i thought u've solve it edi....
long time didn't visit this 0-100......

 

[arrowhead]

Still got... Left my car at hospital already...

 

[ahlim13]

interesting topic.. bro.
im facing a bit different problem now.. but its not when the car running. its when cold start the car.. its jerk and off itself.. need to hit accelerate when start. engine light come on if i start like that... giving code 9 and 15. = ="

so i suspect distributor..
change distributor.. result cannot.. change another one again.. oso same. after change got Reset ecu by remove battery cable oso..

the problem appear since ron95.. but once i got this problem.. i oledi change back to ron97. result still same.. haiz..

got any suggestion?
sry ah.. borrow ur topic.. i see a bit kind of similiar..

 

[E-Tech]

If you got spare ECU just give it a try-swap..
See DIY section for more info.....this could happen to your ecu too...
Leaky caps that damages anything near it...

For Ron 95... jerking.... had that too, but during drive only especially after releae throttle time...That will be my first and last time on ron 95 (Shell ran out of 97 and V-pakwe)

 

[arrowhead]

My car runs fine on ron95. Just that everyones opinion on ron97 made me continue using it. But honestly, ron95 didn't give me problems at all.

 

[E-Tech]

For mine, no choice cause I'm running with quite high C.R.
And since it is a weekend car, let it drink v-pwr lor...
So how's the progress in "hospital"....let's hope it is something simple...
"Baby" sick...:call2:

 

[arrowhead]

Not baby.. Wife.. Haha. Under the knife as we speak. I haven't follow up. Concentrating on my day job :(