2006 Apex mcx 290, stuttering

[le700]

I got to drive my Apex a bit last weekend. It worked well most of the time, but once it stuttered. Ususally it charges 0.9-1 barg. But once it stuttered/offloaded when it came to 0,4-0,5 barg. I drove it home slowly, pulled all panels and checked for loose hoses etc. I could not find anything wrong. Later the same day it worked perfectly again.
What could it be? Would be nice to get any tips /pointers.

If it happens again while down somewhere steep I won´t get home again without proper boost. So any tips may help get me home..

 

[mbarryracing]

Do you have an AFR gauge on it? It could be stuttering because of being too rich AFR at that moment and that will not give 0.9-1.0 pressure

 

[le700]

No, i don´t have a single afr gauge, but i´ve got the mcx display. Maybe it is on there.

 

[mbarryracing]

Without it you are just guessing.

 

[le700]

ok, thanks. Have to check it then.

Found a thread on a norwegian forum, a guy with similar behaviour, and the fuel pump gone bad. But his was constantly not going over 0,4-0,5barg. Mine only did it a few times in the same trip, and were good next trip.

 

[mbarryracing]

Fuel pump going bad would show lean AFR. I highly recommend installing a wideband AFR lambda meter.