Azid Rush Donating doesnt allow you to be an idiot! Member 692 Member For: 17y 10m 9d Gender: Male Location: Newcastle Posted 12/11/10 03:03 PM Share Posted 12/11/10 03:03 PM Hey guysRecently I put a GCG rebuilt turbo in after mine had shat itself due to fords terrible oil filters. Since the change I took it for a drive to find that under heavy acceleration and pick up it starts massively backfiring and spluttering losing all power. While car was off road doing turbo, I bought a set of NGK plugs and put them in. They were already gapped properly and I was careful not to bump the ends at all so ive eliminated plugs as the problem considering there brand new and gapped properly.Car is completely stock. On idle and being revved all sounds good and right, just under heavy boost and power it happens. Pretty daunting sound, almost like a car hitting the rev limiter. The coil packs seemed all fine and in good condition when I changed plugs and didnt have any problems before turbo stuffed up. Could the cat have sh*t itself in the changeover, or cat not lined up with dump pipe properly? Any suggestions muchly appreciatedcheers Link to comment Share on other sites More sharing options...
IBOO57 Member 538 Member For: 15y 6m 13d Posted 12/11/10 10:24 PM Share Posted 12/11/10 10:24 PM What where the plugs gapped too?Gap them down to .65 mm and if it still does it get some new coils. Link to comment Share on other sites More sharing options...
Redback Banned 236 Member For: 15y 6m 15d Gender: Male Location: Blacktown NSW Posted 12/11/10 11:51 PM Share Posted 12/11/10 11:51 PM You could check the cat out. Also was the replacement turbo modified in any way or just a rebuild?Check all boost hoses and vacuum hoses and make sure they're connected well. Link to comment Share on other sites More sharing options...
our06t Mmmmm......BOOST Member 3,135 Member For: 17y 7m 28d Gender: Male Location: central coast Posted 13/11/10 05:21 AM Share Posted 13/11/10 05:21 AM Stop being a tight arse azz take into justin for a quick look before you brake something. Link to comment Share on other sites More sharing options...
bjc Donating Members 2,823 Member For: 21y 3m 22d Gender: Male Location: Townsville Posted 13/11/10 09:14 AM Share Posted 13/11/10 09:14 AM What where the plugs gapped too?Gap them down to .65 mm and if it still does it get some new coils.What he said Link to comment Share on other sites More sharing options...
ali@btamotorsports Member 42 Member For: 14y 9m 8d Gender: Male Posted 13/11/10 09:18 AM Share Posted 13/11/10 09:18 AM (edited) sounds like you can possibly be overboosting get rid of the CAPA tune and get a custom tune,generic tunes dont work on these cars Edited 13/11/10 09:19 AM by ali@btamotorsports Link to comment Share on other sites More sharing options...
our06t Mmmmm......BOOST Member 3,135 Member For: 17y 7m 28d Gender: Male Location: central coast Posted 13/11/10 10:27 AM Share Posted 13/11/10 10:27 AM (edited) guys azz has been around here a long time so long ,he's gone from modded back to stock.just hasn't edited his sig that's unless you started modding again mate? Edited 13/11/10 10:28 AM by our06t Link to comment Share on other sites More sharing options...
kartman Member 88 Member For: 15y 3m 15d Posted 13/11/10 11:38 AM Share Posted 13/11/10 11:38 AM Sound like valve float. Is it a BA? Shouldn't need to gap down to .65mm, I have cars running 18psi on .7mm gap and you can experience idle issues and log coil faults with too smaller plug gaps, the ecu feedback expects a certain minimum firing voltage. If you stop really quickly does the car return to a smooth idle straight away? The BA is light on spring pressure, what oil did you use on the turbo refit? I've seen cars with weak springs improve on 5-30 weight oil, don't use a 25-50 oil. If you have a CAPA tune on stock engine then you really want to be around 7 psi as at 6000 rpm this is about all the fuel the injectors can supply, they run lean at the top end. I do my stock engine tunes to boost to 10psi at 4500 and then drop to 7psi by 6000 so maintain mixture. Link to comment Share on other sites More sharing options...
Azid Rush Donating doesnt allow you to be an idiot! Member 692 Member For: 17y 10m 9d Gender: Male Location: Newcastle Posted 14/11/10 12:58 AM Author Share Posted 14/11/10 12:58 AM hey guyssorry I should have mentioned more about car. Dont pay attention to sig, my car is completely stock again. I did oil changed with Nulon 10-40 I think it was. The car idles beautifully, it runs fine on low boost u can hear turbo spool up, car picks up fine and slows down to a nice idle again, its only when u plant it and it kicks up to high revs Link to comment Share on other sites More sharing options...
ratter Member 6,793 Member For: 18y 6m 29d Gender: Male Location: @ my laptop Posted 14/11/10 01:14 AM Share Posted 14/11/10 01:14 AM Is the actuator new? if so does it have the same part number as a stock item?How old are the coils? Link to comment Share on other sites More sharing options...
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