Is It Valve Springs

[xrt03]

Hey everyone,

Just after some advice, have 03 xr6t, auto, 100000klms, and have found when I run at full throttle I lose out in the top end of the rev range, feels really flat over 4500-5000rpm, and when I back off it sounds like its runnin on 4 cylinders for about ten seconds. Have done the plugs 1 month ago 0.8 gap, thought that was the problem. If I change manually before 4500 it pulls hard and theres no problem at all.

I am running at 10psi generic tune now, but it still happens on the stock tune, only other mod is centre muffler removed.

From searching on here I thought probably valve springs?

Any help much appreciated :banghead:

[Fat-Tony]

I think your assumption is correct.

[our06t]

possibly

only had mine do it once after a good 10 min run up over a good steep run of corners ,got over the other side of the hills and felt like only a few cylinders running or no fuel for 10-15 sec

haven't had it happen again ,I just put it down to springs

Edited 04/11/08 09:03 AM by our06t

[bluprinturbo]

if I were you id do fuel pump injectors valve springs and cat and have it custom tuned.

Edited 04/11/08 09:13 AM by bluprinturbo