When i am giving the car some for any lenghth of time, like more than a short blast the car starts to cut then go. Hard to explain really. Its not at any particular revs and only when giving it some. Its like kangerooing.
Some of the things i have thought possible are:

Intercooler can't cope.
fuel cut.
Fuel in the tank is swilling away from fuel pump and not enough fuel is getting through.

Any help please.

Also it seems to only happpen in second.

 

have a similar prob mate and also i have posted a thread for some help,hope someone replies b4 i go to work as im away a week at a time.

 

Sounds like your overboosting which causes fuel cut.

 

it could posibly be the maff sensor

 

Should it be overboosting though with an apexi avcr? Thought this kept it in control.

 

we had a problem like that after going to the garage repeatedly as it only happend with the engine under big load it turned out to be a couple of cracked coil packs failing under load

 

is there any way of testing the coil packs?

 

dont tnink so yourself as they will only fail under load the garage eventuly took them out and found two cracked...replaced them and it was good as new...

 

Maybe i will see if i can take them off and check them.

 

mine was overboosting and it felt like i hit a brick wall then the power just kicked back in with a nice thump

 

hi pal, I had this problem when i first got the car, firstly i cleaned the boost solenoid (sp) with circuit cleaner, that made a bit of difference then changed fuel pumps, It had a walbro pump all ready but it was on its last legs, put the new one it and it never happened again!

hth
Baz

 

mine has got an newly fitted avcr and a fairly new walbro.

 

it was happening on mine too, i put new spark plugs and ht leads on thinking this was the problem and it was the MAF sensor, if you read up it is a common fault on 99-00 cars

 

I thought maf would affect idle and normal running? This only happens when i hit high boost. When it happens it shows an overboost figure on my boost controller.

 

mine does the exact same!! kangarooes.
espec sometimes flooring it round a corner.
This only happens since I have had the car remapped and have put a cold air induction kit on.
Happens intermittently

 

What is your high boost? Why dont you wind down your boost to 1.10 or 1.00 bar and see if problem goes away.
BOV leaking or not able to take the high boost?
Change fuel filter,could be partially blocked...
Hope this helps.

Chan.

 

The boost was setup on the avcr by zen so i would have thought it would be correct. Its at 1.45 bar @ 4500rpm.

 

Try wind it down to 1.20 bar or even lower and see if problem still persist.I think 1.45 bar is on the high side,ie standard ECU will do fuel cut to prevent engine from blowing up.

Chan