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General => The garage => Topic started by: tmparry01 on 26 July 2012, 21:55

Title: On Boost Misfire - AGU K04 - with logs -solved
Post by: tmparry01 on 26 July 2012, 21:55: I'm getting a misfire when boosting to +10psi; At higher (+5k) rpms it seems to mostly clear. Its also chucking out black smoke.

Its ran great for 15k mile after being mapped as below...

(http://i357.photobucket.com/albums/oo15/tmparry01/Graph/k04agu.jpg)

Ive tried changing plugs, coilpacks, ign amp, MAF, lambda, N75, wastegate feed clamp and also checked for boost leaks.

What else could it be? I've done some logs below, I dont know if anything can be seen from these....???

(http://i357.photobucket.com/albums/oo15/tmparry01/Graph/log1.jpg)
(http://i357.photobucket.com/albums/oo15/tmparry01/Graph/log2.jpg)
Title: Re: On Boost Misfire - AGU K04 - with logs
Post by: Chris. on 11 August 2012, 20:50: N75 duty cycle is maxxed out. Is it a boost drop/cut or engine misfire?
Title: Re: On Boost Misfire - AGU K04 - with logs
Post by: RTechUK on 15 August 2012, 20:26: Could be a lean misfire, fuel pump, crap in the injectors, fuel pressure not scaling ect..

Get it booked in and I will give it a wideband logging session to see what going one, in theory it should take us an hour or two to pin point using external logging on the lambda and fuel pump.

What spec are you running again?

Nick
Title: Re: On Boost Misfire - AGU K04 - with logs-solved
Post by: tmparry01 on 09 September 2012, 21:43: Thanks for the replies guys. Turned out to be one of the pencils that connects the coil packs to the spark plugs. Took an age to solve and only found when I saw I had a spare one in the garage. The old one had a sooty appearance on the outside....
Title: Re: On Boost Misfire - AGU K04 - with logs -solved
Post by: RTechUK on 13 September 2012, 18:05: The rubber on the pencil?

Nick
Title: Re: On Boost Misfire - AGU K04 - with logs -solved
Post by: tmparry01 on 15 September 2012, 19:58: Yes, not sure if the plug not being torqued down property or what caused the carbon looking build up...