my 95 import has got a bit of a running issue but only sometimes???
its been modified by me and remapped running no probs but it has started hunting on tickover every now and again and was driving it yesterday and when was slowing down and pushing clutch in it was cutting out sometimes? when driving it it runs fine and boosts fine,it is using more petrol normaly get 230 miles out of full tank but has dropped to 180-190.
it was remapped over 18 months ago and run fine till this started have checked all vacumn hoses for air leaks but all ok could it be lamba sensor??
mods are as follows before someone asks
550 injectors
walbro fuel pump
fuel pressure regulator
front mount intercooler
bellmouth wrapped decat downpipe
blitz r spec 3" exhaust system
powertec air filter
z32 orange maf sensor
apexi ecu and commander
gizmo electronic boost controller
td05 16g turbo
ssqv dump valve
lightened pulleys
running 335bhp and 325ftlb torque
any ideas
ps theres no lights on dash on runs fine when actually driving

 

 

Hunting is almost always an air leak.
How did you check for vacuum leaks? Best way is to put a pressure source at the turbo inlet, or alternatively block the turbo inlet and introduce pressure through a vacuum hose.
Dump valve leaking?
I have also ever seen a leak between the MAF and turbo that caused the strangest drivability issues ever.

 

sounds like lamda/afr to me. whats your closed loop idle like.

 

dont mean to be ignorant but whats closed loop idle??
if it was air leak would hunt all time not just every now and then

 

any ideas

 

what condition are your spark plugs in? i'd also - as mentioned - check all the air carrying pipes for leaks & investigate the afr/lamba

anyone - what about the coolant temp sensor? is that only when cold it causes issues?

 

idle and lambda control are part of the ECU control parameters. have any of the values in the apexi unit been changed to cause lumpy idle when cold or hunting of idle when warm. does hot or cold days make a difference?

 

temp sensor fine had that issue last year,temp was fine on dash but one that tells ecu was up and down had probs starting it changed temp sensor for ecu was fine

no doesn't matter what day it is and its not hunting all the time one minute you stop at lights its fine next time you stop could be revs up and down stop again 5 mins later could be fine but also using a lot more petrol and cuts out when u slow down and put clutch in some times