Pop At Wot To Much Boost?

[scot502]

MY CAR HAS A POP OR BACK FIRE AT WOT IT DOES THIS EVEN IF SCAN MASTER SHOWS NO KNOCK I HAVE FUEL SET AT 42PSI LINE OFF I HAVE AJUSTED IT UP AND DOWN NO HELP CAR IS STOCK WITH 160 STAT, COLD AIR INTAKE,OLD HYPER TECH CHIP,SCAN MASTER,AJUSTABLE WASTE GATE SET TO STOCK LENGTH. THANKS FOR ANY HELP CAR HAS 42,000 MILES

 

[fullahotair]

There is a strong possibility that it is your coil packs. They tend to work fine while not under load, but under load they will break up and causing popping. I would suggest finding someone local to you with a known GOOD coil pack and swap it on to see what happens. Do a search on coil packs...there are ton of discussions on them....

Nate

 

[chadly]

x2 Very possible the coil pack. As stated find someone local to do a swap.

 

[gbsean]

do you have a enough gas in car....mine did that when I had less than a 1/4 tank......after I made the pass...went back got more gas....made another pass without changing anything and ran fine......

 

[Just a Six??]

Also not really related but???? Get a modern custom burned chip from Eric at Turbo Tweak. That outdated generic one you have is marginal at best.

 

[rodman99999]

Also- check all the hose clamps from your turbo and intercooler to the throttlebody.

 

[Sweet6]

I have had pops from being too rich. But it could be a number of things.

 

[TURBOELKY]

I've only had a backfire under boost 2 times. Those 2 times were the sounds of my head gasket blowing out of my block.
As loud as a shot gun. So if your backfiring, keep out of it until you find your culprit!

 

[stagemonster]

How much boost on the top end

 

[bmackinnon]

There is a strong possibility that it is your coil packs. They tend to work fine while not under load, but under load they will break up and causing popping. I would suggest finding someone local to you with a known GOOD coil pack and swap it on to see what happens. Do a search on coil packs...there are ton of discussions on them....

Nate

x3 - most likely the coil pack... been there, done that.... a couple times....

 

[bsdlinux]

x3 - most likely the coil pack... been there, done that.... a couple times....

Agreed. Also check simple stuff like PLUGS been there done that too

 

[buickruss]

Also check the Y hose under the turbo.
I had one go bad which caused an overboost condition

 

[Underboost]

How old are your plug wires?

+4 on the Coil Pack

 

[scot502]

How old are your plug wires?

+4 on the Coil Pack

going to replace wires, and check gap on plugs, already replaced ic hoses thanks for help. its rained all day so i could get car out and play. has anyone seen new tech ad in gm high tech on 87 gn coolant swap and carbon clean out

 

[meanchicken]

I've had the wrong range plugs cause this, and also had the coil pack cause this.
What plugs you running?
Have you run an ohm meter across your coil pack towers?
Bad plug wires could also cause it...ohm those out too.

 

[Black Power]

I've only had a backfire under boost 2 times. Those 2 times were the sounds of my head gasket blowing out of my block.
As loud as a shot gun. So if your backfiring, keep out of it until you find your culprit!

That is no exaggeration. It is as loud as a shotgun! Don't ask me how I know

 

[scot502]

That is no exaggeration. It is as loud as a shotgun! Don't ask me how I know

whats best plug wires to use im going to be doing more upgrades so i want to get some good ones now.

 

[terik.m]

My TR was doing the same thing. Check for vacuum leaks.

 

[2QUICK2B6]

I've had the wrong range plugs cause this, and also had the coil pack cause this.
What plugs you running?
Have you run an ohm meter across your coil pack towers?
Bad plug wires could also cause it...ohm those out too.

X2 check plugs and coil pac ... my car usta fall on its face after the 1/8 an start poping

 

[SCOOBY DOO]

Worn cam lobe?