Need help!! Twin turbo silverado
#1
Need help!! Twin turbo silverado
I’m getting a bad bucking/falls on its face just after 3k-3500 rpm, Hook my scanner to it and everything looks to be working. And it throws a p0121( TP position) code every time I can get it to fail, driving regular you would never tell anything is wrong with it until you get on it(maybe a slight surge at part throttle at times)
Mods: twin 60mm eBay turbo @8psi
60lb injectors
206/212 112lsa cam
walbro 450
duel flowmaster40s (if that matters)
2bar map
things ive tried to fix it
new maf
map
throttle body
throttle pedal
intake gasket
new tr6 plugs @.30
checked continuity &power between the pcm and the first 4 things I listed.
Obviously been to the tuners (2) and they can’t fix it
smoke tested
and I’m pulling the valve covers off now to check the springs.
Is is there anything I’m missing ? Any help would be much apreciated. I’ll send you an 18pk if you lead to the fix lol
and it’s holding 8 psi through the run
Thanks!
Mods: twin 60mm eBay turbo @8psi
60lb injectors
206/212 112lsa cam
walbro 450
duel flowmaster40s (if that matters)
2bar map
things ive tried to fix it
new maf
map
throttle body
throttle pedal
intake gasket
new tr6 plugs @.30
checked continuity &power between the pcm and the first 4 things I listed.
Obviously been to the tuners (2) and they can’t fix it
smoke tested
and I’m pulling the valve covers off now to check the springs.
Is is there anything I’m missing ? Any help would be much apreciated. I’ll send you an 18pk if you lead to the fix lol
and it’s holding 8 psi through the run
Thanks!
#2
[QUOTE=Sage G;5432033]
I’m getting a bad bucking/falls on its face just after 3k-3500 rpm, Hook my scanner to it and everything looks to be working. And it throws a p0121( TP position) code every time I can get it to fail, driving regular you would never tell anything is wrong with it until you get on it(maybe a slight surge at part throttle at times)
Mods: twin 60mm eBay turbo @8psi
60lb injectors
206/212 112lsa cam
walbro 450
duel flowmaster40s (if that matters)
2bar map
things ive tried to fix it
new maf
map
throttle body
throttle pedal
intake gasket
new tr6 plugs @.30
checked continuity &power between the pcm and the first 4 things I listed.
Obviously been to the tuners (2) and they can’t fix it
smoke tested
and I’m pulling the valve covers off now to check the springs.
Is is there anything I’m missing ? Any help would be much apreciated. I’ll send you an 18pk if you lead to the fix lol
and it’s holding 8 psi through the run
Thanks!
Forgot to say it’s a 08 silverado 1500 5.3 ly5 engineMods: twin 60mm eBay turbo @8psi
60lb injectors
206/212 112lsa cam
walbro 450
duel flowmaster40s (if that matters)
2bar map
things ive tried to fix it
new maf
map
throttle body
throttle pedal
intake gasket
new tr6 plugs @.30
checked continuity &power between the pcm and the first 4 things I listed.
Obviously been to the tuners (2) and they can’t fix it
smoke tested
and I’m pulling the valve covers off now to check the springs.
Is is there anything I’m missing ? Any help would be much apreciated. I’ll send you an 18pk if you lead to the fix lol
and it’s holding 8 psi through the run
Thanks!
#4
TECH Regular
I would start with tightening up your gap. That is an easy check. Try bringing your gap down to .025. If that doesn't change it you can open the gap back up.
I always shoot for the most gap you can get. I start tight and make sure it runs good. Then start opening it up until you get blowout, then go just a little tighter.
I always shoot for the most gap you can get. I start tight and make sure it runs good. Then start opening it up until you get blowout, then go just a little tighter.
#9
#10