**Urgent Q** Has this happened to anyone..

[sepulchral]

Hey I have an s13 with sr, fmic, catback, stock injectors/turbo, walbro 255 fuel pump and a Greddy Profec B Spec 2 boost controller. When i go on my high boost (12lbs+) setting itll boost perfectly strong to 5,000rpms- its always 5,000rpms then i'll hear a loud "PUT PUT PUTT" like rapid backfires and the rpms will drop, boosting stops completely. It never does it on stock boost or low boost(9-10lbs). Anyone know what this problem is from/ any solutions?

Mike

[sepulchral]

oh yea theres a crack in my mafs little computer box where the wires connect, i mean if there was somethign wrong with it then it would happen at low boost too wouldnt it?

[TokyoNights]

Mabie you have to change the spark plug gap,, or could be that you start to run lean for some reason..

[sepulchral]

top.......

[gsracer]

yea you probablay gapend them to much try gapping the spark plugs to .9 - 1.0 mm or .37 to .39, that has happened to me before, ok on low boost sputtering on high boost at a high engine speed. try the plugs.

[JagdStealth]

Sounds like plug gap to me as well... I gap them down to .34. The downside is slightly decrease fuel economy (maybe 1MPG)