OK here's a soundclip...sorry it's so close, I'll have to get the camera a little further away next time. Anyways, you can here all this LOUD POPPING in the exhaust, and it has no throttle response whatsoever. When we first got the car running, it had throttle response and ran good, so I'm not sure what changed.

Right click/save as: (682K)
http://paradox.shacknet.nu/dave88lx/...slikecrap1.mp3

 

Have you checked the plug wire routing? It must be something about these LT1's but i always get the plug wires mixed up and put one on the wrong cylinder.

 

Yea, sounds like you either have the wires going to wrong cylinders or your OPTI was installed wrong..trust me, you can install it WRONG..
.
Cody

 

Rechecked my plug wiring, I've got them all hooked up right to the Delteq...1357 down the driver side and 2468 down the passenger side.

Listen here, and you can see that at one point it was running pretty decent:
http://paradox.shacknet.nu/dave88lx/...a/takeoff1.wav
http://paradox.shacknet.nu/dave88lx/...a/driveby2.wav

 

Its always good to check the wires via the chart by DELTEQ too. Been there done that.

 

I've got the wires right, but I'll recheck them again...

I suppose maybe one of the coil packs may have gone bad...I guess just start pulling wires off it and listen to see if they arc eh?

Don't know why the plugs are all fouled with sooty carbon though.

If anyone else cares to comment...

 

Mine popped like crazy, when almost all plugs were fouled. I think, this is your problem. Why it is running that rich, who knows... Check all sensors, better scan it.

 

I was thinking that was what the problem was before when it first started acting up. I put new plugs in, drove home, and it started acting up again. I'm wondering if the bad valve adjustment caused these plugs to foul again, even with the right lash, and if getting yet NEW plugs again will fix the problem? What a waste of 16 plugs! My last set were carbon/soot fouled, I'd imagine these are too.

 

Id guess your opti is f'd up. Or something with the delteq setup itself, if you're positive the plug wires are all right.

 

I'll have to figure or see if shoebox's site has a way to test the opti. So long as the optical side is working, then that's all it needs to do, since that sends the signal up to the Delteq. I don't believe the optical side has too many problems, and that it's usually the high voltage side that goes out? Anything's possible though. I'll search around to see if there's a way to test it. Still have to see how to get oil up to them other rocker arms too.

 

Dave,

Remember that there is barely a trickle of oil going thru the pushrods up to the rocker arms even at 50psi of pressure.

Getting that things A/F tuned in right would help out the plug situation a ton.

Bret

 

I hear ya...all but maybe 4 or 5 had oil trickling out, the rest were dry. I wouldn't have killed these Comp R lifters already you think? I was going to redo the lash again tonight but I'm just entirely too lazy.

I ordered a hard drive for my laptop so that I can datalog and send that to Ion for a more precise tune, but I need to get it running like we had it the first night before I worry about that. The tune wouldn't have changed overnight...I don't think LOL.

I bought ANOTHER set of plugs, so I'm going to do the lash yet again, and put some fresh plugs in it at the same time, and maybe see what that does.

 

OH YEAH...I have NGK TR-55 plugs, gapped at .050". Should I close them down to .035"?

 

I would put them around .040"

 

Hey man as for the popping sound and the backfire through the intake goes I would really check the adjustment because I have had 2 different cars having that same problem that you are. One of them had an F'd up lifter that actually chewed up an exhaust lobe to the point that it was completely rounded it off and looked like a spot for one of the cam bearing's to rest on haha. The other just out of adjustment but i would get that right cause it sounded alot like that both times.