rebuilt vr6 s/c misfire under load

[raddo-dave 0]

i have just rebuilt my golf vr6 engine and fitted a v9 stage 1 that came with a chip remapped by stealth and it runs on idle fine but under load it has a misfire

 

i rebuilt the engine with new rings,rod bearings(shells),valve seals,new gaskets,spark plugs,chains,guides and tensioners,oil pump,water pump

 

i have replaced the coilpack,leads,blue temp sensor, and maf with fully working parts off my vr6 daily

 

its a 95 2.8 obd2

 

 

thanks dave

[CorradoVR6-Turbo 0]

what plugs do you run and whats the gap?

[raddo-dave 0]

ngk bkr5ekup

 

i havent touched the plug gaps so i am unsure

 

dave

[CorradoVR6-Turbo 0]

I would ditch the multi ground plugs and run something like a bkr6/7e plugs and gap them to around 0.7mm.

[raddo-dave 0]

ok thanks i will give that a try and let u know how i get on

 

dave

[Abdul 0]

I was just about to say look at your plugs lol.

 

Good luck sorting it mate.

[volksworld13 0]

bit off topic where did you buy the piston rings from,as i thought vw only made over size rings, which meant you needed a rebore and over size pistons?

 

also check you ht leads for arcing at night, and check resistance of each lead to rule them out.

[Abdul 0]

Sorry to go a bit off topic but what is arcing?

[KADVR6 0]

i bet it needs re-mapping, i had a similar problem when i fitted my charger from another corrado with a stealth re-map'd ecu and chip, and in the end i had to get it re-mapped, it sorted out the misfire but then just stalled all the time :censored:

[Abdul 0]

i bet it needs re-mapping, i had a similar problem when i fitted my charger from another corrado with a stealth re-map'd ecu and chip, and in the end i had to get it re-mapped, it sorted out the misfire but then just stalled all the time :censored:

 

F*ckin vr's eh lol :roll:

[raddo-dave 0]

bit off topic where did you buy the piston rings from,as i thought vw only made over size rings, which meant you needed a rebore and over size pistons?

 

also check you ht leads for arcing at night, and check resistance of each lead to rule them out.

 

i got them from a engineering shop near me, they are mahle ones too

 

what ohms shold the leads read?

 

thanks

[raddo-dave 0]

i am gonna get a new set of leads just to be on the safe side now so does anybody have any recommendations on what leads to buy?

[KADVR6 0]

original vw ones are just fine, or the dubpower ones.

[Abdul 0]

original vw ones are just fine, or the dubpower ones.

 

Is there actually any difference in the dubpower and magnecore leads? I ask because i have dubpowers now but want a set of red magnecores.

[Toad 0]

About £100 and the magnecors are shit.

[Abdul 0]

About £100 and the magnecors are ****.

 

Thanks dude, ill stick with my dubpowers then lol.

[raddo-dave 0]

wheres the best place to buy them from?

 

thanks

[KADVR6 0]

wheres the best place to buy them from?

 

thanks

 

 

standard vw ones = main dealer

dubpower ones = dubpower

[Jim 2]

Dubpower leads are really excellent value for money. Well worth a look. DG Autotech endorse them over VW leads these days!

[CorradoVR6-Turbo 0]

Before splashing out on new leads i would do the most likely thing and replace the plugs first.

[raddo-dave 0]

ok i have been and bought some bkr6e plugs this morning but i dont have access to a feeler gauge till tomorrow, i have put them in anyway just to see if it gets better and it didnt do anything

 

these are the plugs i took out

 

 

the four on the left were all wet and the two on the right were dry and sooted up(these were from the 2 front cylinders on the right)

 

thanks for all the replys guys its much appreciated

 

dave

[CorradoVR6-Turbo 0]

thats poor,you say you have swaped the leads and coilpack over? the plugs that are wet,does it smell of fuel or oil?

[raddo-dave 0]

fuel

 

yeah i swapped the leads and coilpack over from my other vr6 i use daily

[CorradoVR6-Turbo 0]

is there any sign on the plugs you took out of fine like pencil lines on the ceramic of the plugs? just need to 100% make sure its not the leads or coil pack breaking down,i know they are off your daily but once forced induction comes into play cylinder pressures are much higher and you need much stronger spark.

 

If all that fails i would look into the mapping side of things,what fuel pressure do you run? standard 3.5?

[raddo-dave 0]

when u say pencil lines do u mean like a hair lin fracture?

 

its got a 4 bar fuel reg