Basic Performance upgrade

4gbanger

1,500 RPM
Senior Member
Jun 26, 2013
1,958
386
1,683
Johor/ShahAlam
well im not so sure but the its only minor jerk and felt like abit power loss. it also happen when i'm at low rev cruise..
 

zaifulaika

Active Member
Dec 24, 2013
32
5
508
Kuala Lumpur
well im not so sure but the its only minor jerk and felt like abit power loss. it also happen when i'm at low rev cruise..
bro, i have just about the same problem like yours.... starting from few days back, my atr start to 'cough' when cruising lower rev (below 3000). loss power and also jerking when cruising at steady speed. this morning, started to jerking even bad. Ask around before, some said because of the air flow sensor, some said because of the O2 sensor and the other told me because of the crank shaft...

anyone can give me a hand here.... :confused:
 

biao

Known Member
Senior Member
Oct 21, 2012
348
24
518
perak / ipoh
bro, i have just about the same problem like yours.... starting from few days back, my atr start to 'cough' when cruising lower rev (below 3000). loss power and also jerking when cruising at steady speed. this morning, started to jerking even bad. Ask around before, some said because of the air flow sensor, some said because of the O2 sensor and the other told me because of the crank shaft...

anyone can give me a hand here.... :confused:
if is air flow sensor problem, u pedal heavy let the turbo kick in, when the jerking come, the engine will look like have a emergency brake, total pull back the power and when u have pedal but no any response. so i think is air flow sensor is time to change. cos i just change 1 only before cny, because i wash it then spoil already.
 

4gbanger

1,500 RPM
Senior Member
Jun 26, 2013
1,958
386
1,683
Johor/ShahAlam
well based on my experience, O2 sensor is the last resort. if air flow sensor kong, ur FC and power loss and also it affects the idling problem, ur car even barely drivable. better check the plug, plug cable or ignition coil. last time my car jerking really bad when revving above 4000rpm full throttle. found out that i use a wrong sets of plug. it was denso iridium IW20(meant for stock everything). i was suppost to use IW22 or IW24(meant for boost above stock)
 

zaifulaika

Active Member
Dec 24, 2013
32
5
508
Kuala Lumpur
if is air flow sensor problem, u pedal heavy let the turbo kick in, when the jerking come, the engine will look like have a emergency brake, total pull back the power and when u have pedal but no any response. so i think is air flow sensor is time to change. cos i just change 1 only before cny, because i wash it then spoil already.
totally agree with u bro biao. when i press harder and turbo kick in, the jerking disappear. but when steady speed, jerking come in and its just like having an engine break... :bawling:

well based on my experience, O2 sensor is the last resort. if air flow sensor kong, ur FC and power loss and also it affects the idling problem, ur car even barely drivable. better check the plug, plug cable or ignition coil. last time my car jerking really bad when revving above 4000rpm full throttle. found out that i use a wrong sets of plug. it was denso iridium IW20(meant for stock everything). i was suppost to use IW22 or IW24(meant for boost above stock)
bro 4gbanger, already change the plugs to IW24 last month. at the moment, having power loss, jerking (i call it coughing) and higher FC (4 to 5 km/l)... :banghead:

above all, currently using petronas ron95. does it give any bad effect to the engine?
 

biao

Known Member
Senior Member
Oct 21, 2012
348
24
518
perak / ipoh
totally agree with u bro biao. when i press harder and turbo kick in, the jerking disappear. but when steady speed, jerking come in and its just like having an engine break... :bawling:



bro 4gbanger, already change the plugs to IW24 last month. at the moment, having power loss, jerking (i call it coughing) and higher FC (4 to 5 km/l)... :banghead:

above all, currently using petronas ron95. does it give any bad effect to the engine?
so u find a workshop to check.
 

stutzedward

3,000 RPM
Senior Member
May 27, 2009
3,416
561
1,713
KL
Iridium needs to be replaced around 25k. U can drag a bit more but u start to get backfire at high revs. MAF costs around 1.4K
 

biao

Known Member
Senior Member
Oct 21, 2012
348
24
518
perak / ipoh
already gone to few places and asked around... too many assumptions, dats y i seeks advice from sifus here... anyway tq bro biao and bro 4gbanger...

anyone know where to find MAF sensor and the approx price?
go cut-shop find or see which shop have mod car d. find got who dismantle from evo.

---------- Post added at 01:27 PM ---------- 6 hour anti-bump limit - Previous post was at 01:25 PM ----------

Iridium needs to be replaced around 25k. U can drag a bit more but u start to get backfire at high revs. MAF costs around 1.4K
iridium not can use 100k?
 

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