Oil In Air Intake

[andy07]

Hi everyone

My 2.8 v6 has been struggling on the hills for sometime now, spent nearly 300 quid on trying to get it sorted, so far I have replaced ;

Coil pack

Spark plugs

HT leads

Cat

& MAF

but it still struggles on the hills althought much better on the flat, anyway on dismantling the air intake ducting I noticed alot of oil just before the throttle flap, does this mean that the crankcase breather is knackered and the misfire (more noticeable at 1000-1100 revs) is because oil is beening drawn into the inlet manifold, and could this be why it uses a fair bit of oil even though it does'nt smoke.

Many thanx in advance

[cyborg]

Hi everyone

My 2.8 v6 has been struggling on the hills for sometime now, spent nearly 300 quid on trying to get it sorted, so far I have replaced ;

Coil pack

Spark plugs

HT leads

Cat

& MAF

but it still struggles on the hills althought much better on the flat, anyway on dismantling the air intake ducting I noticed alot of oil just before the throttle flap, does this mean that the crankcase breather is knackered and the misfire (more noticeable at 1000-1100 revs) is because oil is beening drawn into the inlet manifold, and could this be why it uses a fair bit of oil even though it does'nt smoke.

Many thanx in advance

Hi if your rev's increase whilst going up hills its a sure sign your clutch is on its way.If it doesnt then its compression check if ok check lifters.The valve's are hydrolic the easy way to check is take rocker cover off and use a piece of wood to press the tops of lifter under each cam shaft lobe,if they go down more than .10mm or so then they need replaceing. Oh before you do all that i notice you said you changed ht leads did you put some light grease on then and made sure there home sometimes if you dont they will catch and not connect.

[andy07]

hi cyborg thanks for replying,

Its definately not the clutch as the revs drop aswell.

Good tip about putting light grease in the plug caps though but have checked and double checked to make sure they're seated properly.

 

I have recently had it put on vag-com at my local garage and its coming up with fault codes for the MAF, did replace the MAF several weeks ago with genuine BOSCH one so I am thinking now it could be the wiring to the MAF as I have read a few write-ups about it, so I'll be checking that out next when/if the weather brightens up.

 

I bought a new crankcase breather cost

[cyborg]

May not show up in vag 'mine didn't' If your fuel is around 15mpg also and car feels lumpy then lambda sensor is where i would hedge my bet 16.99 one on flea bay works well ,size 22 spanner will be needed.

Oil in intake could be Leaky valve seals,Essentially the piston compression pressure pushes petrol air mixture up into the head through the valve seats, a small amount will come through in normal operations. the fumes sent by breather hose from this process are normally burnt off (some modder's disconnect Pcv Valve's to reduce emissions on mot's or for small power increases they use an oil catch tank).

A small amount of oil is normal on intake as it is also used to reduce wear on intake valves and was traditionally there to lubricate old carburetor cars.I don't think its your problem,Mind you i haven't seen car! Did you check compression ?

good luck.