scottisha3

the fault was with the inlet ports when i fitted the head with same agn code i never noticed the inlet ports were bigger on new head so i had to remove my original plastic inlet manifold and fit the metal one that came with new head i fitted

just to let you know found the fault and car runs perfect now

the full story of this car is i bought it with the head destroyed by belt failure i bought a replacement engine but only used the head it was skimmed and pressure tested prior to fitting both engine have agn code but my engine has plastic inlet manifold other had ally manifold this was the only difference i could see i built engine up and started it only to find it was hunting at idle thinking it as something i had done on rebuild i checked and triple checked and replaced all the parts listed only to find out the car was running this way before belt failure 

i only have one lambda on my car just before the cat

could you tell me what the reading your are saying should be

hi just a update car has been scanned by 3 different machines no fault codes all the parts i have replaced  are as follows

spark plugs,leads,coilpack,camshaft sensor,crank sensor,both knock sensors,maf,full timing belt kit,throttle body and had it reset,cat, the fault is when car idles it hunts and sounds like missfire get it up to 1500/2000 rpm  runs smooth

full new timing belt kit and water pump fitted(gates kit)

i have a 1.8 20v agn a3 on tickover it hunts but get revs over 1500rpm its nice and smooth i have replaced the following parts

maf,plugs,leads,coil,all vacume and breather hoses,cam shaft sensor,both knock sensors,crank sensor checked timing about 10 times there are no fault codes or eml on

if anyone has had the same problem or can shed some light i would be thankful as the wife is talking about buying new car and i have to payfor it

hi all