After having the nismo exhaust, high flow cats and plenum spacer installed, I noticed that my rev metre when in parked, idles funny, I sat for 5 mins watching it as it fluctuated between 1000 rev then drop to 500 (when I thought it was going to turn itself off) then back up to just under a 1000 revs again constantly. Is this normal after such mods or is this telling me something?
My brother just took his car to Nissan and they said there was some air escaping from where the plenum had been inserted and that it will need to be rethreaded as the screws wont go back in.
On mine I opened the bonnet turned on but cant hear any whistling noise of air coming out from the engine bey, just hear the note of the engine dropping below the rev then going back up again