Rough idle at startup and burning oil B20 .

[jdbenson]

Hey all,

I have a B20 block with wiseco 12:1 pistons, B16 head with skunk2 cams and internals, tuned on hondata with no cat. The normal idle for the car is 1100rpm. When i first stsrt the car up when it is cold it will rev up to about 1600rpm and then imediately drop to about 500-600rpm. The rpms go up and down by about 100rpm until the car hits 1100rpm which is when the idle smoothes out. The car is burning oil a little bit and cars normally stay back and dont get close when they are following me. Any clue whats going on? Any help would be appreciated.

 

[CAFROG]

Do you have a fast idle thermo cable attached to the bottom of theTB? It controls idle at cold start up

The burning oil sounds like the rings on the pistons are letting oil by or maybe the valve guides
No matter what.....I would think you should remove the head and go from there.

 

[jdbenson]

I dont think so. The cable looks stock. I will take a closer look at it over the weekend. The valves were just readjusted is it possible they may not have done it correctly? Thanks for your help.

 

[CAFROG]

Valve lash wouldn't cause that. Clearance too tight would cause the car to reach running temp too quick. Lash too loose would be loud and you'd know.

FITV only has coolant lines going to it. Not the throttle cable.

 

[jdbenson]

It may be a clearance issue. The engine heats up pretty quick even in 40° weather but doesnt overheat.

 

[CAFROG]

Even if the lash is too tight......you got bigger problems with oil going through the exhaust. The fix will not be that easy.

 

[Magana559]

Many people think you can buy pistons and just drop em in, well you can't.
Your piston to wall clearnce might be off and not allowing the rigs to hold back the blowby.
Or you didn't tune and you fuel washed the walls and you have to hone and re ring the block.

 

[Ek908]

I would agree with magana