noisy lifters.

[zeeman]

Yep, lifters are all swapped out. I get an occasional tapping for a second or two at start up, then all is quiet. However, I am having other issues with the car that prevent me from running it to much. I have adjusted them3 times to 3/4 of a turn preload and still have a misfire. The whole engine shakes under load. I am going to go to 1/2 a turn of preload and adjust them running next time. Its all I can think to try next.

[Steves94Z28]

Yep, lifters are all swapped out. I get an occasional tapping for a second or two at start up, then all is quiet. However, I am having other issues with the car that prevent me from running it to much. I have adjusted them3 times to 3/4 of a turn preload and still have a misfire. The whole engine shakes under load. I am going to go to 1/2 a turn of preload and adjust them running next time. Its all I can think to try next.

Dang, that stinks man. Hope you get it figured out....What kind of lifters did you use this time?

[zeeman]

Damned if I can remember..... I got them at auto zone ... If I figure t out Ill post it.

[Fox Slaughter]

Ew Autozone lifters?

Should of put LS7 lifters in.

[Steves94Z28]

Damned if I can remember..... I got them at auto zone ... If I figure t out Ill post it.

thanks zeeman, appreciate it brother!

[Steves94Z28]

Ew Autozone lifters?

Should of put LS7 lifters in.

So LS7 lifters will fit in a LT1? Had no idea....do i need to also use LS push rods or does it matter?

[Fox Slaughter]

I adjusted mine with the engine off and they were whacked when it was running.
So what I do is tighten them all down.
Start the engine, one at a time, back it off till it clicks. Slowly tighten till clicking stops, then 3/4 more. Repeat for each rocker.

[nascarnate326]

Ls7 is the standard replacement for lifters now, he may have got them.

They have whored the ls7 parts out to every thing they could.

[Fox Slaughter]

Yupp they don't make LT1 lifters anymore so the replacement is LS7 lifters.

Which work great unless youre going race engine.

[zeeman]

Damned if I can remember..... I got them at auto zone ... If I figure t out Ill post it.

Awe crap! I meant Advanced auto parts. Its a shame really....senility at such a young age...

[zeeman]

Ah ha! Sealed Power was the brand lifter I installed.


I'm sure I will get replys now on how crappy Sealed Power lifters are. Lol

[zeeman]

I adjusted mine with the engine off and they were whacked when it was running.
So what I do is tighten them all down.
Start the engine, one at a time, back it off till it clicks. Slowly tighten till clicking stops, then 3/4 more. Repeat for each rocker.

I've done it this way the last time too. Still has a misfire. And I don't know why.

[Fox Slaughter]

Then I'd probably look at something else causing the misfire.

[zeeman]

Then I'd probably look at something else causing the misfire.

Certainly, thats why Im stumped. Everything is new,plugs, wires, optispark, cap, rotor. Ive checked the wires to make sure they are seated and tight, they are not burned or arching. The plugs all look ok, maybe a bit lean but they appear to be firing. I have run out of ideas.

[hoogiesngrinderz]

Certainly, thats why Im stumped. Everything is new,plugs, wires, optispark, cap, rotor. Ive checked the wires to make sure they are seated and tight, they are not burned or arching. The plugs all look ok, maybe a bit lean but they appear to be firing. I have run out of ideas.

Clean the MAF or borrow a known good unit. Hell, unplug it and see what it does Should put it into SD mode, might want to be careful w/ aftermarket bolt ons if you don't have a WBo2 sensor.

I'd have to read up on LT1, but LS1 (1998 at least) will base fuel solely on the MAF above 4000 rpm and anything below is a VE table and MAF calculation.