Change in the Power when restarting the car..

[akarshmalikal]

Hey Mates,
When i start the car and drive i feel loss of power ( it happens few times a week ) then i just turn off engine and on engine again and i get the actually power of a alloytec. Why is this happening it has anything to do with ECU ( as new cars feature shut downs a cylinder if not required. To save fuel ) ??? or my coil pack or spark plugs playing ??

Even sometime when i apply full acceleration when car is on neutral gear it mis fires sometime. Please suggest.


Reagrds
Akarsh Malikal.
VZ lover :surprise:

 

[Benboy]

What methodology are you utilising in order to calculate the 'loss of power' when starting the engine ? When you turn the engine off and on again how do you know that there is any variation in the power output of the engine ? If you continue to apply full acceleration when the car is in neutral, it will only be a short time before your engine 'lets go' and you will no longer have to worry about 'power loss' - you won't have ANY power at all !!

 

[markbaja]

Oh boy!

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[somefool]

If you continue to apply full acceleration when the car is in neutral, it will only be a short time before your engine 'lets go' and you will no longer have to worry about 'power loss' - you won't have ANY power at all !!

I thought alloytecs do not allow the driver to rev past 3000RPM when in neutral anyway (-i could be wrong but) so how can one possibly do damage to the engine revving it to 3 grand? If its mis-firing doing 3G then something isnt right.

It sounds like a bit of a wierd issue, maybe coils, maybe ECU. Ive heard of the alloytecs having coil issues. Service it often? tell your mechanic at the next service about it.

 

[akarshmalikal]

What methodology are you utilising in order to calculate the 'loss of power' when starting the engine ? When you turn the engine off and on again how do you know that there is any variation in the power output of the engine ? If you continue to apply full acceleration when the car is in neutral, it will only be a short time before your engine 'lets go' and you will no longer have to worry about 'power loss' - you won't have ANY power at all !!

Hey Benboy,

sometimes when i apply 100 % of acceleration the pickup is less than the actually as compare to, when i turn off the engine and on the pickup is different ( more The actually pickup )... i tested in the same straight road with A/C off in both the case. As i mention in my post this happens few times in a week.

 

[akarshmalikal]

I thought alloytecs do not allow the driver to rev past 3000RPM when in neutral anyway (-i could be wrong but) so how can one possibly do damage to the engine revving it to 3 grand? If its mis-firing doing 3G then something isnt right.

It sounds like a bit of a wierd issue, maybe coils, maybe ECU. Ive heard of the alloytecs having coil issues. Service it often? tell your mechanic at the next service about it.

Yes dude u are right its 4000 RPM it won't go beyond it in neutral gear. Even i feel so it have to do with coil pack... There is strange problem with my commodore, when even i face a problem and take it to a mechanic. My commodore just work fine in front of mechanic without misfire etc.. lol

 

[gendi]

you know what ive actually noticed this with my VZ wagon, some days its got plenty of power then some days it feels gutless, i havnt tried turning the car off then back on to see if it makes a difference but somedays the car goes better then others.

 

[holdenvtman1123]

Colder days will be more efficient than warmer days

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[akarshmalikal]

Day before yesterday I changed Spark plugs + New air filter, Vz working cool so far. My old Spark plugs was 1 year old with 50k km, How usually should i change spark plugs ???

I asked mechanic about the coil pack, how to know if the coil pack is damaged or not. He replied but doing computer test ( OBD 2 scanner ). Is that true ???

 

[aljohnson]

I've got the exact same problem, sometimes the power can change multiple times within one day!


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