Splattering And Back Firing On Full Boost

[benjis32]

hi,

first of all i have an r32 with rb25 with front mount, 3" exhaust, pod and bov. when i give it full noise it runs fine until it hits full boost (stock) and then it splatters backfires. but it only does it when it hits full boost. just put new platinum spark plugs that are gapped at 1.1 mm. andb4 hand it was splattering when i gave it full noise even when not on full boost but not as bad i put my mates coilpacks in and it fixed the problem for about 5 hours and now it splatters and backfires a hole lot worse than b4.

any help would be good

thanks

benjis32

[barnoon]

What spark plugs were in before you change over to the platinums? 1.1mm gap would be too big wouldnt it?

Could be your AFM playing up I had similar symptoms on my R32 when my AFM went.

[benjis32]

What spark plugs were in before you change over to the platinums? 1.1mm gap would be too big wouldnt it?

Could be your AFM playing up I had similar symptoms on my R32 when my AFM went.

iriduims. the afm is touching the cooler piping could this be a problem. i was told these were the recommended plugs for rb25. can i change the gaps or do i have to buy them already gapped

Edited October 10, 2006 by benjis32

[dead32]

you can regap your new plugs, i wouldnt recommend re gapping old plugs, backfire generaly = ignition problems in most cases, considering your boost and fuel system is stock,

[barnoon]

Try cleaning your AFM out with contact cleaner or something similar, I dont see how it touching the piping would be an issue. Im not too sure on weather you should regap or not but I had major missfire problems and when I gapped my plugs down to .8 the miss went away.

[benjis32]

it also only does it when it is under load and when it hits full boost its fine when it is in nutruel and until it hits full boost