I would check your cam timing which can be hit and miss with the stock pulleys. It should be around 35 thou lift at TDC on the inlet and 30 thou lift at TDC on the exhaust.Morning guys and girls,
I fitted a pair of VVC exhaust cams to my 1.6 16v the other week and it idles very lumpy first thing (and if you leave it for a few hours) as if i had more aggressive cams in it.
It does smooth out after about 15 minutes or so of driving and it is fine throughout the rev range, its just the idle.
I know a few people that have fitted VVC exh cams to 1.4's and 1.6's and havnt had this problem so im abit baffled.
Ive also got a misfire, which is starting to get worse but ill be checking the ignition system this weekend to try and solve that.
I did have to space out the distributer as i found the spigot drive must not be far enough in as the rotor arm was wearing the inside of the distributor cap away (have both been subsequently changed)
If you take a look at the video i have attached, if i compress the breather pipe from the inlet to the throttle body, the engine calms down but driving with this compressed (as i experimented) makes the engine bog down big time and usually stalls under load.
As you can see its got a VVC inlet, 52mm throttle body, ZR 160 ITG panel filter, and the exhaust system is now a decated Metro GTi system (video shows it as a Scorpian exhaust but have changed that since).
Im not sure if its because the ECU cant cope with the new cam specs, might it be worth trying a 135 ecu set?
Hope someone can help as its doing my head in now.
There is an article on my website on how to check this.