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dan(nthqld)

Rough Acceleration At High Revs

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I have a 2004 BA mk2 xr6t and today it started playing up.

I have just been on a long trip from townsville to sydney and back (over a few days) and on the way back about 400km from home the car started feeling a bit sluggish.

Whilst going to overtake a car I planted the right foot down, car started coming up to speed then all of a sudden the power just disappeared. it was like I was driving a n/a. Felt like no boost getting through at all. I could hear the turbo spooling just fine, just wasnt creating power.

I slowed right down then speed up slowy keeping it under 3grand. Nothing happened all seemed fine. as soon as I started putting the foot right down to higher revs it did it again. I have put spitfire through it but it doesnt seem to be a fuel issue as there is no rough idle now rough acceleration when revs are down low.

Im not sure here but could this be a problem with the waste gate actuator not functioning correctly?

Car is completely stock and only had it serviced about 3000kms ago.

If u need any more info let me know

Thanks

edit: also forgot to mention wen accelerating at the high revs I can hear like a fffffut ffffut sound from the exhaust

Edited by dan(nthqld)

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How old are your coil packs mate? Loss of power on boost usually means coil packs are screwed. You can pick up genuine sets on ebay for around $160.

cheers, J

Edited by kirjo

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Well since ive had the car, just over a year, I have never replaced them so I presume they have never been changed. im trying to put the car in this week to see if it can get fixed. Thanks

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na its not spluttering, revving up its fine til about 3000rpm then the power disappears, then it will stay without power all the way to 6grand whilst making intermitent ffffut fffffut sounds out of the exhaust

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I have a 03 XR6T, it ran fine under 3000rpm, but when it wanted to boost it would loose power and wouldn't gain revs easily and the same exhaust sound you described, just missing under boost, it was just a spark plug (could also be a coil as stated above), replaced them and the fun returned

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had a look for boost leaks. there was a hose disconnected near the "blow off valve". I placed it back on and drove it. seemed fine. drove it the next day and problems again. dunno if I just got lucky or wat. seems to be no other boost leaks. there was a small bit of oil in the turbo. only a small amount and a little bit on the intake side. is this normal?

thanks turbo I am trying to get the car in this week so they can have a look at the coil packs and plugs

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Took car to mechanics today. They hooked it up to diagnostic tool, no fault codes. They took it for test drive and it wouldnt play up. I stopped in the afternoon and went for drive with them. Couldnt get it to do it - :roflmbo: Whilst driving home I gave it a stab and there it was. It feels even worse now, losing a lot of power, and also you can hear the turbo spooling loud as, normally very quiet. Ive checked all intake pipes and vacumn hoses and everything I can think of for boost leaks and nothing. So now im stumped. Dunno wat to do. is there a way to test coil packs other then try them on a different car? Im thinking its either them or a spark plug, but apparently no miss was showing on the computer they connected :S

Edited by dan(nthqld)

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I had the same problem took the car in to the local ford it took them 3 goes to find what was up, it ended up being the coil pack. that was about 1 year ago but iam getting the same problem again. So iam going to get them to change the coils over and the spark plugs then it will be right as rain again....

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Process of elimination mate. Go to Ford, get some F6 plugs part # AGSP22Z11. These are the best plugs and are only about 12-14 bucks each. If you are going to get your car tuned in the near future, gap them down to 0.75mm. This will save the labour getting it done later when you up the boost. Then go on ebay and get yourself some genuine Ford coil packs for dirt cheap. FORD BA - BF Brand NEW Genuine 6-Pack Ignition Coils - eBay, Other, Car Parts, Accessories, Cars, Bikes, Boats. (end time 19-Mar-10 04:40:50 AEDST)

For about $250, you will get away with brand new genuine plugs and coils. If you go to ford for the coils, they will sting you about $500 for the set!

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There should be a small rubber hose going from the front bottom of your turbo to the actuator. Pull it off and spray a good amount of wd40 down it then connect it back. Take the car for a drive and see if it improves.

If it doesn't then it’s probably the plugs or packs but could also be the fuel filter.

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yea I have already done that to the solenoid. Having a really good look at it this weekend. will pull off every pipe and inspect, and also have a good look at plugs and coils.

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driving it home tonight, temp was cooler then normal. car went like nothing was wrong at all, apart from the loud turbo spooling (which I think is do do with the piping, will look at it on weekend). No power loss watsoever. So wat could make the car lose power on hot days, but wen cool not affect it at all. Could this be coil packs?

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You will notice a big difference in performance up here when it is cool compared to hot. Wait until cold winter nights and you'll hear it spool alot quicker.

Your problem is strange though as it is standard. I've never had a cat fail so cant say what the symptoms are but have found with either coil or plug problems the engine missfires under load.

Maybe you need to put it on a dyno to check fuel pressure and see what boost and afr it has. Could be a lack of fuel pressure?

Who was the mechanic you took it to? Ford are useless fcks up here that why I never bothered with them except for my free replacement tyres...

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Na I take it to honeycombs, their audi service centre (where I bought the car). I am taking it to a mates on sat, hes got a sniffer for afr readings so I can check my fuel pump, gonna change fuel filter aswell. Give the cat a kick to see if it rattles lol

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