Mivec Problem...Please Help!..SOS

[HEIZAL]

Good day all sifus.I have some serious problem with my Mivec.The problem
is the engines always drop dead all of a suddent especially when you are
going below 40 kmh.sometimes when stop at the traffic light it also off
by itself.Apart from that i cannot start immediatly and have to wait
around 2 to 4 minutes.As far as i am concern the timing is just good
because idling is around 800 and with aircond 1k.So far i have change the
trottle body,spark plug and the cable but the problem still exist...Man i
am deep *****...Please give some tips so i wont have headache when rolling
downtown with my Mivec.Apart from that do inform and recommend me the
type of spark plug and engine oil i should use.This problem happen at any
time when start early in the morning or idling time.....It only stay ok
when i am doing the chasing or running....Heard Mivec common Problem is
the Map sensor...Where can i get a replacement...

 

[phantomRX8]

bro i dont know whether this is relevant or not but try advancing ur ignition timing on ur cam

position sensor...maybe a few degrees would be enuff...then u might notice that rpm would

increase a little bit..i had this experience in the middle of federal hiway..then a mechanic

came and he just advanced a bit of the ignition then no problem so far...just a suggestion

but there's no harm in trying right?? gud luck..

 

[t0il3t_duck]

my friend face similar problem before.... he told me his problem is air fuel ratio oh... i think you can ask for opinion from ppl of mivec club....
http://www.zerotohundred.com/newforums/showthread.php?t=1023

 

[Zeroed]

Quite possible that its your ECU acting up... from what I have experienced the engine should be able to start even if the MAP sensor is damaged.
I once saw a Waja with similar problems. For that car it was the ECU dying.

 

[boosook]

hey bro i got the same prob as urs with my vr4...i went to my mech and change timing belt,spark plug,and cables...using NGK cables and spark plug...its ok now...might come again la...maybe

 

[yellowklone]

this problem not related to MAP sensor..I'm saying this because i already faced the problem..MAP sensor damage on my case occurs when "check engine' indicator lit even your cruising at 100km/h..then you feel that your car are running like only 3 cylinders and when your stopping (using air cond) engine will die just like that..after i replace wit new MAP sensor..everything back to normal..but i tell you, the price of that sensor, is killing you!! a piece, size of a bottle cap (slightly bigger) cost you around nearly RM 500!!

 

[munky]

i didnt read fully wats ur problem coz really lazy right now but last time i faced this problem with my mivec is because 1) spark plug kong and (2) throttle body dirty

 

[HEIZAL]

Mate as i gather the information and so far the diagnose problem as below:
* Map sensor
* ECU
* Trottle body - Confirm ok.
Apart from that i went to local EON spartpart centre and they said for local map sensor you can get it around Rm 140 and From Mitsubishi around Rm 480....Is it true when i asked them about this sensor they said we can use the local proton one because all the same....Boleh percaya ka?????Ada butol Ka?

this problem not related to MAP sensor..I'm saying this because i already faced the problem..MAP sensor damage on my case occurs when "check engine' indicator lit even your cruising at 100km/h..then you feel that your car are running like only 3 cylinders and when your stopping (using air cond) engine will die just like that..after i replace wit new MAP sensor..everything back to normal..but i tell you, the price of that sensor, is killing you!! a piece, size of a bottle cap (slightly bigger) cost you around nearly RM 500!!

 

[HEIZAL]

Mate how much the ECU will cost me and is it difficuilt to get a replacement?Can we swap and use the normal proton ECU....
Apart from that how to confirm wheather these part perform or not ...ECU,Map Sensor and Trottle Body...

Quite possible that its your ECU acting up... from what I have experienced the engine should be able to start even if the MAP sensor is damaged.
I once saw a Waja with similar problems. For that car it was the ECU dying.

 

[E-Tech]

Yo Bro,
Try checking the "speed sensor" behind the speed/rpm meter.
This happens to GTIs also...might be the same.

 

[kwai]

ecu cannot change with proton one... if not ur car will become non-mivec... :D
hahah
:D

 

[boyzone]

yes, plug with normal ecu first, just to confirm ... if ok, that mean is ecu faulty...

actually cannot to said faulty, because from electronic view, maybe some parts like regsister, capacitor or tansistor was open during working in high temperature. :D
think u need to try sawp ecu .

 

[boyzone]

Yo Bro,
Try checking the "speed sensor" behind the speed/rpm meter.
This happens to GTIs also...might be the same.

speed sensor faulty MUT will show error ?? but seldom to hear can be happen ... can be try also :D