i have a 2000 audi tt 3 months ago i swapped the engine with one from a 2004 jetta the only difference between them is vvt mine did not have it the jetta does. since i replaced the engine ive been having cold start problems like rough idle, multiple cylinder misfires and even engine shut off every now and then but if the engine shuts off the car will not start back up it will just crank slowly like if there was no spark and if it was flooded with gas. i really really need help with this its driving me insane idk what to do i replaced plugs, coils, coolant temp sensor, maf sensor and nothing has changed i also have an overboost issue idk if the two are related or not codes are cyl, 2 3 4 and random misfire and turbo bypass valve open. please if anyone has any ideas i will greatly appreciate them.

 

when vvt was introduced to the 1.8t is was primarily for cold start ups, your ecu isnt programmed for vvt meaning your tensioner is off setting all your valves during start up while the fuel trim and ratios are still at normal run. swap out chain tensioners for a non-vvt one and should fix it, but thats quite a project, if i were you, i would do a head swap.

not sure about your over boost

 

thanks for the reply im going to have to do the tensioner swap the head is just way more expensive than the tensioner its just very wierd how it wont do it everytime

 

ok so i was reading on vwvortex that some guy also had a cold start problem on his vvt engine due to his tensioner not working properly so what he did was remove the piston from the tensioner to stop it. do you know if thats something i can do temporarily???

 

no idea, i wouldn't try it.

find the right non-vvt head on a classified from somebody put it on and sell your other.

need to replace gaskets and head bolts and recycle oil and coolant properly.

a head swap will be alot easier and cheaper than a head rebuild. you can sell your head as is if you dont rip it apart.

do this the right way and labor yourself you could do this under $100 if your fortunate and have tools