Popping Noise?

[The fire is lit]

Hey guys, when I give my car some beans at about 5k it starts popping and almost hits a bit of a wall, as if it struggles to rev more but then seems to be ok. What could be doing this? It's a s2 rs4 with a exhaust and pod that's it.

[Nee-san]

Its called a misfire mate, type Misfire, Miss etc into the search there are heaps of topics on it.

Firstly,

Check all your silicon joiners and hose clamps as if they afm is reading air but the engine is loosing it under pressure then you will overfuel and get these symptoms.

Does it blow alot of black smoke when this happens ?

secondly check the following:

Spark plugs and or gaps,

coil packs themselves,

Ignitor (sits towards the back of your engine)

How does the car feel when it hits this "wall" ?

also you could try buying some air flow meter cleaner from repco or wherever and giving your AFM a nice spray clean (DO NOT TOUCH ANY PART INSIDE THE AIR FLOW METER BODY)

Goodluck.

[The fire is lit]

Thanks dude it did blow some black smoke, it popped a bit revs jumped up and down but not massive, like 100rpm then came on again.

I am seriously not good with cars so I need all the help I can get:(

[Nee-san]

If your not comfortable doing the sort of stuff I mentioned in the first post mate, your probably better off taking it to a workshop that has experiences with these cars if you can afford it.

Sometimes it's easy to do more harm then good.

Goodluck.

Edited February 6, 2011 by Nee-san

[Big Fella]

Hey guys, when I give my car some beans at about 5k it starts popping and almost hits a bit of a wall, as if it struggles to rev more but then seems to be ok. What could be doing this? It's a s2 rs4 with a exhaust and pod that's it.

hey mate ur in adelaide right?? if you wanna bring down south one day, i can check it out for ya. prob a missfire, but could be hitting boost cut? how much boost are ya running??

mine was the same when it landed here, fresh plugs and general check over solved the issue

[The fire is lit]

hey mate ur in adelaide right?? if you wanna bring down south one day, i can check it out for ya. prob a missfire, but could be hitting boost cut? how much boost are ya running??

mine was the same when it landed here, fresh plugs and general check over solved the issue

Yeah dude in sa. Would be sweet if you could give us a hand.

I think it's running stock boost but not sure, I'll pm ya or something later today

Thanks mate

[pipster11]

Sound like coilpacks for sure

You can wrap them in insulation tape to check but you you'll want to replace them if that solves the problem

[QWK32]

Definitely start with spark plugs, if the car is a fresh import or being serviced by a mechanic with little experience on turbo imports it will probably have the wrong plugs in it as most parts places will list iridiums with a 1.1mm gap and a heat range of 5.

You need to get some plugs in there with a 0.8mm gap and at least a heat range of 6, copper or iridium is up to you, I'd recommend coppers though.

Failing that check your coilpacks, they have an internal ignitor so no external one (like the earlier RB25's in R33's) that can cause issues. Coilpack faults are hard to pinpoint especially where it has a miss under load only, sometimes you just have to bite the bullet and shell out for a new set, but at $600+ for a new set of splitfires, it's a big bullet to bite.

[The fire is lit]

Thanks heaps guys I'll see what happens if big fella can give me a hand. It has a statutory warranty so hopefully they will fix the problem.