hi i have a 98 uk turbo standerd bar a simtek ecu as the MAF went was running mint bar a slight cold start issue.

i have just had the engine out to fit fmic, cold air intake, vf28,ngk grade 7 plugs gaped at .65mm (pfr7b i think), heat wraped the manifolds, clutch and rocker gaskets

i now have a running issue.....it hunts badly at idle, if i pick revs up to 2000rpm and hold in there it stutters and missfires constantly yet when i blip the throttle slightley up to 2.5k runs perfect but has not yet been maped and im wondring if its lickly to be the map or weather to look into outher reasons for this???

thing is i want to drive it (off boost) to get it maped but dont realy want to in this condition

would be gratefull for any help/advice

 

The map does need adjusting but it could equally be a vacuum hose missing/split that is causing the idling issue and/or a fmic pipe that isnt done up properly

 

Sounds like cam and crank errors triggered by engine wiring close to the ht leads.
On the drivers side there is a white round plug that normally fixes to the air box, as you have now removed the air box that plug is probably laying down on the ht leads.
You need to route the leads and cables so they dont touch.
Very common.
Obviously it needs mapping for changes but should idle without misfire etc

Simon

 

Sorry to be cocky but try pulling a vac pipe off on a map based ecu equipped car and see what it does

 

lol

 

hi thanks for the replies people i have cheacked these bits and still the same also a few outher bits and still no joy realy doin my head in now dose anyone have any outher ideas?

 

hmmmm just went to move it back into the workshop and in dint wana go........... im gona put old plugs back in later and try again.......

 

Is map sensor on drivers suspension turret still plugged in?

 

yes it is but i will unplug and reconnect it later..... just refitted old plugs and it started still runnng the same tho but new plugs were soaked...... could having the map sensor plumed up rong cause the same issue? is there a diagram of vac pipes anywhere so i could cheak? thank you again for your input

 

on the suspension turret there is a boost solonoid and map sensor right? (witch is witch lol) any ways with eather unpluged it runns the same could i have got the vac pipes crossed over? bound to be something simple lol

 

Map sensor is the higher smaller one with 3 wires and one vac pipe.
It should be plumbed to the manifold via the pressure exchange solenoid

Simon

 

haha fixed it......dont quite know how lol removed all pipes and conectors refitted them in the same way and hay presto lol runs sweet again

 

cool