3.4 Setup Issues

[Spartan GL]

So my Mod list engine wise is as follows

3.4
Speed Daddy headers
Cat Back Exhaust
2 Magnaflow mufflers
Wizaired Cold Air Induction
3800 Performance PCM (3.4 Mail order)
Autolite 104 Sparkplugs
Ported Supercharger, Blower and Throttle boddy
ZZP Supercharger Coupler
180* T-stat
MSD Coils
MSD Wires



Issues I'm getting is I'm getting crappy MPG (14MPG ish) and it doesnt seem to have the Boost it did before i put the new PCM & 3.4 on also the Boost gauge in the DIC only goes to half way

any ideas?

did the 1/8th in like 10.1

[TorqueAutoMotiv]

cat issue? o2 issue maybe isnt it a fresh build?

[Spartan GL]

i have new o2 Sensors, and I'm not getting any Codes from a scan

and i don't have a Cat converter I have headers and a catback with 2 magnaflows

[blueguy]

Vacuum leak...betting on it.

[Spartan GL]

Vacuum leak...betting on it.

wouldn't that throw a code?

and i know the "T" fitting under the Supercharger, and the brake booster lines where else to check?

[SilvaMan61]

egr connectors lol

[Juanmiguel]

wouldn't that throw a code?

and i know the "T" fitting under the Supercharger, and the brake booster lines where else to check?

My GTP had a couple of lines with tiny cracks and the MAP sensor vac line was completely clogged and was throwing no codes.

[OH4CompG]

Bluegtp91 took the words right outta my mouth

[TorqueAutoMotiv]

vac leaks where id check next

[Juanmiguel]

i bet on vac leak too.

[TorqueAutoMotiv]

just follow all the vac lines and check the tb and so on

[gtpinsc]

is trans doing long shifts?

[SliceTheRice]

I've had vacuum leaks with no codes thrown as well.

is trans doing long shifts?

I know nothing about trannys. What does a long shift indicate?

[gtpinsc]

swicthing gears at a higher rpm than normal... under normal driving.. that damn T boot is a culprit for half full boost gauge and if leak is bad enough it will make trans shifts funny.

[minichopper6hp]

You need to delete your bbv solenoid, i see you have it hooked up in the pic you sent me. Also, 14mpg city is not uncommon when you have your foot on it...

[OrangeL67]

I had the same issue. It's a vacuum leak in one of them small lines over the blower.

[minichopper6hp]

I doubt it. He has replaced all those. Its the bbv solenoid stuck open.

[Spartan GL]

I doubt it. He has replaced all those. Its the bbv solenoid stuck open.

yeah chopper just walked me through the bbv solenoid. still no fix. ='[

[Bio248]

BUY A BOOST GAUGE AND STOP GUESSING AT YOUR CAR MAKING BOOST OR NOT!!

jesus christ...got all that money into your interior and you cant buy a $40 boost gauge and hook it up. that will tell you 100% if you have a vacuum leak or if you're not making 'full' boost.

[Spartan GL]

BUY A BOOST GAUGE AND STOP GUESSING AT YOUR CAR MAKING BOOST OR NOT!!

jesus christ...got all that money into your interior and you cant buy a $40 boost gauge and hook it up. that will tell you 100% if you have a vacuum leak or if you're not making 'full' boost.

I'm picking up one from my friend in tampa in a week.

Vac leak, you knocked something loose putting on the pulley.

minichopper put the pulley & new ZZP Coupler in while the engine was apart. then picked it up a week later ported