My ongoing quest to find the source of my low revs issue (random tickover and kangarooing at less than 2000rpm) has lead thus far;
1. Diagnostic at local main dealer found nothing wrong, at least nothing wrong electrically - so not Lambda
2. Found missing hose clips on a number of pipes, new clips fitted, no change
3. Stripped all the induction hoses/resonator boxes from the MAF to the throttle body, check for leaks, found none.
4. Did a throttle reset (not entirely sure if there was any point in doing this as it's a phase 1 car with an accelerator cable) - no difference.
5. Cleaned the butterfly at the throttle body - not very dirty but did it anyway, no change.
So I decided to have a look at the airfilter to see if it was dirty, in removing the cover of the basket I noticed that one of the securing nuts (1 of 3) was completely missing and that the plastic surround which it would have tightened up against was snapped off, please see picture:
I was able to take the basket cover off, the MAF didn't want to separate all that easily so I left it in place for now. I inspected the airfilter and was surprised as to just how clean it actually was. Upon further inspection of the basket itself, I noticed that the screw which should have gone up to the missing nut was missing too.
So here's my question; if I only have 2 nuts holding the top of the basket in place, will this cause the seal between the airfilter and MAF to constantly break and potentially affect the idle/low revs due to irregular amounts of air being drawn into the induction system prior to the MAF?