Lean Misfires at 2700-2800 rpm

[DoctorDex]

Originally Posted by badass3000

it says in the manual to make sure the painted (dark) part of the spring goes up.

Its pretty tough to see any paint in those pics.

[StealthCRF]

Originally Posted by DoctorDex

Its pretty tough to see any paint in those pics.

the dark areas at the top are what is left of the paint.

[StealthCRF]

Originally Posted by TurboBob

An upside down spring can only be a problem if they are asymmetrically wound. This should be visible especially if 2 springs are held next to each other and then one is flipped around.

If they are asymmetrically wound with the coils tighter at one end, the tightly wound end goes toward the head.

Anyone got pics of stock valve springs?

Bob

I have a box of about 100 of them, i'll take pics on monday.

[badass3000]

Originally Posted by TurboBob

An upside down spring can only be a problem if...

what would it do Bob?

[badass3000]

Originally Posted by StealthCRF

I have a box of about 100 of them, i'll take pics on monday.

so, can anybody tell if the springs are different on the top?
I opened up my valve cover and even tho everything was super clean, I couldnt tell if any were upside down.
Im going to put everything back together and drive around a little this weekend. I mean its like 70* this weekend.

[badass3000]

DoctorDex, since you and I have tried swapping in known good parts for almost everything this could be with the exception of the heads, I propose a deal.
If one of us chooses to change heads, and that fixes the problem, then the other person buys the new head gaskets.
I have my stock heads somewhere, but not much time to swap them.
If you wanted to swap your heads, I would buy your HG's.

[badass3000]

does your rear valve cover still make noises?
mine does too, and theres no reason mine should, there super clean, freshly built, and have 99 liters

[DoctorDex]

My rear valve cover still makes noise.

I made a video of the noise last summer with my cell phone. You can hear the valve cover noise in the first 2 seconds of this video:

http://www.youtube.com/watch?v=bd_HOVb4eDE

. The reason the sound stops is because as soon as I started moving the mike around, the phone didn't pick up the noise as well.

As far as the head gaskets are concerned, how much are head gaskets? I don't have access to any heads I could swap, so it'd probably have to be you doing the swap.

As soon as it warms up, I'm going to pull my rear valve cover off and check each lifter, each valve spring and the bearings in each of the rocker arms. I suspect I may have a flat spot in one of the rocker arm bearings (secondary to an old valve strike which resulted in the heads being rebuilt). If this fails, than I'm going to do everything I can to get my hands on an oscilloscope to test the injector waveforms during the miss...

[J-Ville VR-4]

Originally Posted by badass3000

I have my stock heads somewhere, but not much time to swap them.

They're in my garage I have no time for car work either

[DoctorDex]

Update: Found a scope. Now all I have to do is get my car out of storage, which won't be for another couple of weeks...