Possible Issue - New Logs Added - Update 25/3/12

[marv8]

Forgive me for asking but what range should the engine load run? Percent (par cent/by 100) would surely max out at 100 but the engine load on the second log runs to almost 180%?
Must learn more about these logs as are invaluable understanding the car

Edit - just check my last logs and got to 189%....

[Ryan_Pestell]

cheers for the advice Shop, most helpful, those logs do certainly show the missfire up.

but it only did it the once, it wsa the only time during those logs it did it.

will change a coilpack round tomrrow and try another log.

interesting about the boost, as it certainly doesnt feel as strong as it used to.

[Shoppinit]

Forgive me for asking but what range should the engine load run? Percent (par cent/by 100) would surely max out at 100 but the engine load on the second log runs to almost 180%?
Must learn more about these logs as are invaluable understanding the car

Edit - just check my last logs and got to 189%....

I don't know what the load relates to. It certainly isn't necessarily 100% when you are standing upright on the accelerator. I've never found any use for it, so I ignore it. If anyone can shed light on what it's for, I'll be interested to know.

[Shoppinit]

Ryan, cylinder 7 was logged in the DTCs as well, so it's obviously the worst one. I'm not sure whether the other DTC means that other cylinders are misfiring also, or whether it show up when one or more cylinders misfire.

Do you know what plugs you have in?

[Ryan_Pestell]

just looked through paperwork, and on the QST invoices its just listed as plugs, so unsure, easiest way is going to be take one out when i swap the coilpack around.

looking at the actual mbar it does occationally reach over 2000.

[Shoppinit]

Yeah, but not often, and it doesn't get there quick enough. At one point you are WOT and 2100 of boost is being asked for but only 1800 odd is being reached, and this for several seconds at high rpm, too.

[Ryan_Pestell]

ahh ok. like you say will sort missfire first and then see about the lack of power.

turbos on there way out? eeekkk?

hmmmm

[Ryan_Pestell]

N75 was changed last year according to previous owner, less than 5k ago.

[Mr V10]

Lucky you have that sexy Inchape warranty eh?

[Ryan_Pestell]

Right swapped coilpack 7 with coilpack 5 and run the same test again this morning.

car is flat as a pancake, no doubt its not as quick as it used to be.

logs from about 30 mins ago.

[Ryan_Pestell]

So still missfire on 7, cleared fault codes before run and no codes came up after the run.

Spark plug?

Car feels like its 400hp, feels shockingly slow

[sweegie]

Hi Ryan,

Cant see the misfire count in your logs - you still seeing cyl 7 with the problem after the coil pack swap? As you're duty cycle on the n75 isnt maxed out, i'd say you're running into a limiter in the ecu somewhere, rather than an n75 fault or wastegate actuator problem.

I'd certainly be pulling the cyl 7 plug for a look, and probably popping a new one in or even swap with an adjacent plug. Dont rule out a clogged fuel injector also - very possible to get misfires due to a bad spray pattern so running some injector cleaner through might help too.

HTH

[Ryan_Pestell]

Missfire starts at time log 362 secs.

Don't understand why there would be a limiter. Certainly wasn't there before

Yeah might whip te airbox off again and have a look at plug 7.

[Hedgehog Dodger]

Yeah, but not often, and it doesn't get there quick enough. At one point you are WOT and 2100 of boost is being asked for but only 1800 odd is being reached, and this for several seconds at high rpm, too.

Is that 1800 on both turbos or just one? If both I would say air leak from IC/Hoses/BOV's.

(sorry cant read attachments)

[Shoppinit]

The turbos pool on this car. There's only one charge pressure sensor.

I like the sound of the injector. Swap plug 7 with another cylinder and the injector with a different cylinder again?

If that doesn't work, might be worth looking at the fuel pressure being delivered. When's the last time the filter was changed?