misfire

[mdss]

Hi guys thanks for all the replies. The problem still persists!

I have tried the other coils from my evo that did not work.
I have put on another maf and again this has not worked.
I am now going to try and replace the injector pack as I have a spare somewhere.

Its very odd as it only happens as soon as you turn the car on, once you press the accelerator hard it clears and is fine, more odd is that it does not do it everyday, there seems to be no pattern to this odd behaviour.

Can anyone think what else it could be? As I said its fine on full throttle no misfires but on the first few presses of the throttle when cold it misfires then clears.

I am becoming very frustrated with it to be honest as the car is great and was hoping to keep her for at least another 2 years.

Any help is always appreciated.

 

[weiye]

If you swapped the MAF, it might need some re-scaling by a tuner. Anyway, I suggest to get a tuner to plug in and start the car when cold. Then get the tuner to log the whole process to see if the fuel is to rich or something. If you haven't tried swapping out the idle control valve, you could try that with a used idle control valve that is working fine - don't think this is the issue but seems like you don't have much options left to try. Good luck!

 

[vr2turbo]

Have you tried cleaning the throttle body?

 

[stutzedward]

I don't really rev the car hard when it's cold. So if this is happening only when cold, I have similar experience with my current Airtrek too... after it's warm, then car is normal.

 

[vr2turbo]

I don't really rev the car hard when it's cold. So if this is happening only when cold, I have similar experience with my current Airtrek too... after it's warm, then car is normal.

Sounds more like auto choke problem. Running lean when cold will cough and shudder, and when step on accelerator slightly will idle properly.....

 

[stutzedward]

maybe ... but I was taught not to rev the car hard when it's cold. Learnt it from the days when I first owned a car - 78 Colt Mirage. You know carb cars are like that... and its like nto warming up ourselves before doing some hardcore exercise... will hurt ourself too...

 

[vr2turbo]

maybe ... but I was taught not to rev the car hard when it's cold. Learnt it from the days when I first owned a car - 78 Colt Mirage. You know carb cars are like that... and its like nto warming up ourselves before doing some hardcore exercise... will hurt ourself too...

Not hard revs loh! but step slightly on the accelerator to increase the idling speed.....

 

[4gbanger]

you need more time to check at this problem.. cause it wont always a big issue to solved. sometime it was just a loose MAF socket like my friends did last time. take your time to check one by one.

 

[vr2turbo]

you need more time to check at this problem.. cause it wont always a big issue to solved. sometime it was just a loose MAF socket like my friends did last time. take your time to check one by one.

Yah! my mechanic did before on one car. Remove all sockets he can find, spray contact cleaner then put back.....

 

[stutzedward]

It's a good exercise to remove contact sockets, spray with contact cleaner to improve electric signal connectivity.

 

[mdss]

I cannot find anything I have tried to spray contact cleaner into the connectors but still no joy. I have not cleaned the throttle body so maybe I will give that a go. The only thing left is to replace the battery, a good friend had a Porsche boxster that would do the exact same thing when cold after being first turned on and then it would clear. It turned out to be the battery.

This is very very frustrating. My tuner has a MUT tester so I am hoping it does it in the next few days so I can drive the car over and hopefully it has logged a fault. Like I said some days its perfect and others it does it straight away.

Thanks for all the help its much appreciated.

 

[Izso]

Hi guys thanks for all the replies. The problem still persists!

I have tried the other coils from my evo that did not work.
I have put on another maf and again this has not worked.
I am now going to try and replace the injector pack as I have a spare somewhere.

Its very odd as it only happens as soon as you turn the car on, once you press the accelerator hard it clears and is fine, more odd is that it does not do it everyday, there seems to be no pattern to this odd behaviour.

Can anyone think what else it could be? As I said its fine on full throttle no misfires but on the first few presses of the throttle when cold it misfires then clears.

I am becoming very frustrated with it to be honest as the car is great and was hoping to keep her for at least another 2 years.

Any help is always appreciated.

I know nothing about Airtreks. However I've had this problem with my wira before. Turned out to be my spark plug cables. Does the Airtrek use cables? Or COP? if COP perhaps you have one that's breaking down soon?

 

[vr2turbo]

I cannot find anything I have tried to spray contact cleaner into the connectors but still no joy. I have not cleaned the throttle body so maybe I will give that a go. The only thing left is to replace the battery, a good friend had a Porsche boxster that would do the exact same thing when cold after being first turned on and then it would clear. It turned out to be the battery.

This is very very frustrating. My tuner has a MUT tester so I am hoping it does it in the next few days so I can drive the car over and hopefully it has logged a fault. Like I said some days its perfect and others it does it straight away.

Thanks for all the help its much appreciated.

Not sure if diagnostic will show anything if there is no check light coming on.
Yah! the battery thing you mentioned can be also. My VR got one time idle poorly, however car can still start but can hear having weaker crank, so did not think of changing the battery. However later I decided to change the battery in case it died on me, and like you mentioned the poor idling disappeared....

 

[stutzedward]

I know nothing about Airtreks. However I've had this problem with my wira before. Turned out to be my spark plug cables. Does the Airtrek use cables? Or COP? if COP perhaps you have one that's breaking down soon?

Atr has 2 COP and 2 cables... so the coils are shared.

 

[4gbanger]

better find someone with the same car and runs well.. so you can swap test the parts one by one till you found which one is the error. we'll do exactly like that here..