Hi guys,

 

Was out for a blast today and had issue.

 

Was giving it some beans 6-7rpm in first and had Loss of power and a back fire out the exhaust. The car stuttered and yo yo' d with power cutting in and out, The car eventually died was chucking loads of black smoke out both exhausts.

 

The car fired straight back up but won't idle . The car bogs down until about 3k then revs cleanly.

 

Weird thing is I left the car for a bit (45mins) when I started it idled perfectly. As soon as I reved it up , it went back yo running like dog shit again.

 

So far I have cleaned all the plugs as they were fouled. Cat started straight up and idled for 2 mins perfectly, touched the throttle to reverse of the drive and now back to square one again.

 

No codes.

Good compression on all 6 .

 

 

It's almost like it's on the idle switch them as soon as the TPS send the signal it chucks a load of fuel in .

 

 

Any help is appreciated !

Possible boost leak such as a from a cuff on an intercooler or even the afm playing up ( give same symptoms ) do you have an induction kit ? been out in the rain?

 

Jef

Edited October 22, 20178 yr by JeffTT

Hi Jeff , I took the maf off and it was dry inside . I also unplugged it and it made it worse (wouldn't rev cleanly higher up ) , yes I do have an induction kit with filters that are 7 months old and a standard nose panel .

 

I checked the boost hoses on the fmic . Will have a look tomorrow when I've relaxed a bit .

 

Cheers for the help

It would do this with me if the induction kit filter got wet mate but you have checked this already.

Before I fixed it, one of my coil pack pig tails was loose as hte clip was broken, over 6000rpm the engine used to shake the plug off and it would be a V5 and run really badly. I used to have to get out, lift the bonnet and push the plug in. I didnt go over 6000rpm very often, so wasnt too bad, but i did fix it. Might not be your problem, but give all the plugs a wiggy just incase

In my not expert and limited experience. Dropping a cylinder is a soft cut, like a flattening of acceleration rather than the "ooof-f**k!" sort of a cut you're describing.

 

I had a one sided boost leak and it pulsed down the road, I presume as one bank was fine and the other was struggling.

 

Dodgy fueling or AFR in my experience showed itself with a wierd inconsistent acceleration, flat spots and then kind of alright at WOT.

 

I think it'll be a 1 sided boost leak.

Hi Guys,

 

Bit of an update I have tracked down a big exhaust leak on the passenger side manifold /turbo.

My aussie down pipe had a little blow at the lower flange which made it hard work to track down. When the car was was barely ticking over I could actually see the exhaust gasses by cylinder 6.

 

I'm unassuming because the leak is before the turbo this is air leak and the reason why she is dumping loads of fuel in ?

 

Very glad I have stainless manifold with no heat shields , this may be a pain to get to but not impossible.

It isn't an air or boost leak so won't directly affect the fueling in that way.

 

However, the loss of gas driving one of the turbos will cause asymmetric boost across the two banks of the engine. It will ballance a little using the ballance bar but clearly it isn't ideal at all.

 

There may be something else at play, but 'till you sort that leak out there is no point thinking about other possible issues.

Thanks for the help guys , it was an intercooler hose .

 

All sorted and running sweet again

Glad its sorted mate :thumbup1: