Smoke_ur_5.0

iTrader: (2)

You getting fire? Sounds like a ground isn't hooked up.

JC

All the grounds are on the back of the head. I've checked all that stuff. I don't know what's left to do.

JoSeY

fuel pump went bad...just a thoght.....wait no u smellled fuel....maf sensor hooked up?
wires crossed maybe

JC

I'm gonna check re-check the cam orientation tonight. If they dots are looking at each other then I'm gonna try less preload on the lifters. I'll loosen the rockers a tad just to see if it'll start. If so then I know that's the problem.

DaleMX

iTrader: (4)

There is another thread on here about comp-r and too much preload (2 turns past 0 lash). He isnt running and is getting a backfire through the intake. He's not sure thats the problem, but it sure sound similar.

https://ls1tech.com/forums/generation-iii-internal-engine/130864-scenario-even-remotely-possible.html

JC

LOL That's me!

Pro Stock John

iTrader: (34)

Is the coolant temp sensor in the head hooked up? Is it a 98 block with a 98 temp sensor fitting and you have a 00 male connector?

Stuff like that sensor and the MAF, or not plugging in half of your coil packs will make a car incredibly hard to start.

GrimReaper

iTrader: (33)

you milled your heads which means you have to do the same to your pr's.
your valves are hung open .

Slowhawk

iTrader: (12)

I didn't read that it's backfiring through the intake...The pushrods are way to long..With milled heads,TR cam and STOCK lifters I run 7.35 pushrods and still have .080 preload.The comp R's recommend the most of .030 preload.I would guess you are hanging the valves open.

JC

Folks let me first say that I appreciate all of you guys hanging in there with me.

Now, I went out tonight and torqued the rocker bolts to 11lbs instead of 22. While doing it I was thinking that it didn't seem to make much difference. I tried to start it and it backfired loud out the back. At least it didn't blow the hose off the manifold this time.

I get home when it's dark and I go to school online at night so I don't have much time to fool with the car unless it's the weekends. So I will have to wait until tomorrow night to check that the timing isn't off a couple of tooths.

Will a .005 mill make that much of a difference to where if the PRs aren't adjusted the valves will hang open?

Unaffliated Racing

iTrader: (15)

a few things....
1. a stock length PR will be just fine 7.4"
2. Comp R lifters are only supposed to have .002"-.004" preload..excessive preload will damage the lifters..that being said..you need to switch to an adjustable valvetrain..you need to keep the torque spec to 22ft/lbs..you dont want the rocker bolts to back out..so you will either to shim the rockers up(cheap, non-recomended way) or buy an adjustable rocker(recomemded)
3 the comp R lifter is made for more spring pressure and higher rpm..if you use a standard spring(like a 918) then the excessive preload will most likely cause the valve to be staying open and you not getting any compression..like most have said

JC

Heck. It'd be cheaper to just go back to stock lifters. The springs are Isky doubles. (the fat ones)

strokedls1

iTrader: (1)

Just shim up the rockers to get the right preload. A compression test will tell you right off if the vavles are staying open.

Pro Stock John

iTrader: (34)

It's compression test time.

With mine it was obvious, there was no compression.

I had 7.450's based on some bad advice. I had like .150 lifter prelod if I recall.

JC

I'll do the Comp. test this weekend.

JC

What should my cold compression numbers be?

JC

My cam gear looks like it's off a tooth. Is that enough to prevent the car from firing? Heard of any cases like that?

slyws6

Ok first of all you can tell if your valves are hung open by the way the engine sounds when cranking it over. If it has the normal lope sound while cranking then it's okay. If the engine sounds like a .....hmmm.... i guess like your started kicking out and spinning freely without the lope sound then your valves are hung open. If the cam is off a gear yes it more than likely won't start, everything is happening at the wrong time and it the car will backfire. I'd start by getting that thing dead on then retrying.

-Sly