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The mkiv Supra Owners Club

Finally found the root cause of my Aristo misfiring problem!


aido

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Well I've been having issues with the Aristo for the past couple of months, started off as a misfire under load and then started with a lumpy idle and misfiring all the time..

 

Have to admit I was getting really worried something really major was goosed, like say the engine :o

 

I'd replaced the sparks recently, thought it had initially cured the problem but then back it came worse than ever, so I'd just assumed it was the coilpacks and was going to get someone to give it a good look over to see what the crack was!

 

Well...

 

Had major issues yesterday, and I mean major, car is overboosting (not going above 1.2 but hitting 0.5 bar when cruising at 30 and struggling to pull) running really badly, my thoughts got worse and I assumed the gearbox was screwed, all sorts of nightmares were going through my head as to how much this lot was going to cost to sort so I turned the AC and fans all off and just happened to notice I could faintly hear rushing air - managed to make it all the way to the office and popped the bonnet for a quick check over....

 

Turns out the bloody air intake plastic piping has split and it's releasing the air there so I guess this is why it's been misfiring as it must have started off as a tiny split, so it's been leaking under load, which is what I was initially seeing at WOT - then it's got to the point where it's got bigger and bigger and resulted in the misfires cruising at 2k rpm!!

 

Well just as luck has it I happened to have a spare one sat in the front room thanks to Mr Ellen, so got to work today to fitting it..

 

It's a different car, oh my *** I forgot how hard this thing was supposed to pull - I'd just assumed it was me getting used to the car which is why it was feeling slow - but turns out it isn't at all - it's just because it has been getting slower and slower until yesterday when I got overtaken by a lorry on a hill as I was trying to get to the office :lol:

 

Slight problem now though :o

 

Decided to give it a bit of welly for the first time in a ages - pulled like a train then BOOM, big bang and all power immediately cut and the boost guage dropped straight down to near the bottom, well below where it idles anyway, can hear the engine struggling so pulled over in Attecliffe and next thing she stalls - first time she's done this.

 

All sorts going round in my head at this point, oh *** what's happened now etc...

 

Pops the bonnet and oh bugger me the same part we just swapped has popped out, so sorted it at the roadside and then managed to limp nback to work at which point I've tried tightening up as much as i could with what was available at the time...

 

Left it there tonight as I didn't want to risk it happening again on the way home in Friday rush hour traffic - the fact that the girl who brought me home is hot was just a bonus :D

 

So, anyways, I'm guessing the jubilee clamp has seen better days, so I'm guessing time for some Mikalors now...

 

Also read on here that applying hairspray to the plastic can also help so will do that too I reckon!

 

Any other tips please to make it stay there as I can't be done with it if it's going to start popping off everytime the car is getting some hammer :lol:

 

Thanks in advance :D

 

Oh, this is the bit that's died:

 

http://xs215.xs.to/xs215/07215/knacked.jpg

 

That pic was taken last August and it looks perfect - I'll get a pic up of the knackered bit when I get the car on Sunday, it's really perished badly!

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