Poor Idle And Air Leaks

[petesy71 0]

hi, i've been reading a lot of posts on idling problems, and one mentioned the screw holding the oil filler to the inlet manifold. i had a look today and discovered this hole and was wondering is it the one that was mentioned?

 

with the engine running i can hear air rushing into this hole,however when i cover it up the car stalls, leading me to think that it's something else.

any help much appreciated,thanks, pete.

[welshpug 1,626]

if the throttle stop or air screw have been adjusted to compensate for the airleak it will stall when you remove the leaf, stick a suitable bolt in it and unsrew the air screw on the throttle body to achieve a suitable idle speed.

 

You may well find that you need to adjust the air flow meter a little to compensate as it would have been adjusted higher to compensate as well.

[petesy71 0]

if the throttle stop or air screw have been adjusted to compensate for the airleak it will stall when you remove the leaf, stick a suitable bolt in it and unsrew the air screw on the throttle body to achieve a suitable idle speed.

 

You may well find that you need to adjust the air flow meter a little to compensate as it would have been adjusted higher to compensate as well.

 

thanks welshpug, is the afm easy to adjust?

[welshpug 1,626]

yes, but best to leave it till you find a friendly garage with a gastester, its just a 5mm allen key.

 

basically set the throttle to spec, then adust air screw till its idling at roughly 900 rpm, then set afm. (CO% at idle should be 1.5 but anything up to 3% is acceptable for MOT purposes, lower than 1.5% and itll be a bit lean, higher and it'll be a bit rich and thirsty)

[petesy71 0]

thanks a lot for the info mate, pete.