Crappy Running Gst After Swap..

[jott5555]

Ok heres a lil background

90 gst blows a valve we have a perfect 114000 mils 4g63 from a tsi we swap in everything goes well swap is done along with a b16g added. so we did boost leak test fixed a couple leaks, new plugs and wires, start it up and it sounds like a lawn mower, Really bad miss. we put in a new coil and set the timeing 5deg before tdc and man it ran sweeeeeeeeeeeet no miss nothing. after 5 min on the road the miss came back.

check timeing it off by 5 deg again. reset timeing ran fine, 5 min later timeing is off again. now im leaning tword bad cas i just wanted some more imput..

the upper eng (head ect.. ) was just redone. it has no boost leaks. the ecu has no "fishy" smell nor any residue on the ciruit boards..

so what do ya all think?

 

[jott5555]

Anyone? i did a search and couldnt find anything?

 

[SpeedFreak03]

It really sounds like the CAS because the timing keeps getting reset. I'd give that a try.