New engine, popping under boost??

[GasGuzzler]

^^^ echo

[George C]

i had a few issues i found on my setup


first issue i had want seemed to be a 3 bar map but was actually a older 1 bar map..in boost motor would just die and amost stall

second issue was my narrowbands were screwing with the tune. i shut them off and ran OLSD and never had an issue again.

i run un gapped plugs. so .035 and no issues with my combo

[Justin_Inc]

i run un gapped plugs. so .035 and no issues with my combo

x2, i would open the gaps up to .028-032, as for what it could be, tune, coil, plug, valvespring/seat (kinda doubt it), or just a tune issue.

[trx2stroke4life39]

Try a leak down test. Check for valve leaks and leaking gasket at the same time.

[farmtruc]

Taking the shotgun approach;, changing out heads as we speak, plugs, coils, wires, anything on the heads.

We'll see how it turns out after the install. I'm really set on these heads causing the problem, sticking valve, bent valve, seat, etc, something like that.

The only difference between this engine and the previous one ; are the heads. Everything else is identical.

hope it works,
allen

[flaco]

i would suspect a cracked plug, when installing them sometimes the socket binds on the plug and makes a hairline crack and causes the same conditions.....i have had that before....

a week spring would not cause the issue, it would just bleed off the pressure IE..running fat...

but keep us updated on your results since you've taken it apart...

a bent reluctor ring would pretty much pop the same but on higher rpms.... i had one of those problems too, but it would do it at 5500-5800 all the time...

x2 on quik, i would do a .030 or so gap...unless running high boost 20 + i would do .025-.028

[Trick1]

Plugs wires etc the easy stuff.

My truck had all kinds of banging and popping going on, had a bad injector.

[farmtruc]

i would suspect a cracked plug....
but keep us updated on your results since you've taken it apart...
x2 on quik, i would do a .030 or so

I forgot to mention, I did change plugs, but it's getting a new set just incase.

got it all apart and back together again. Just need to get in two plugs and the coils, then let it warm up and top everything off.

i regapped to .030 this time. Thought the smaller gap might cure it, but it didn't. I'm running msd coils just to see if it helps.

I'll keep you updated,
thanks for the feedback.


hey, btw, i did notice something. some of the cylinders had black residue outside of the cylinder bore, like the combustion/explosion escaped pass the head gasket sealing ring. I guess like a head gasket leak.

[ducky]

I know this is a shot in the dark, but maybe if this doesnt work try regapping to .035. I had some bad popping with my plugs gapped at .030. FWIW

[Bagged93gmc]

maybe your head is warped causing it to leak outside the chambers?