Installed Accufab 75mm TB and Plenum, but now..

Smeech · Nov 21, 2004

I installed the accufab 75mm TB and Plenum on my car... it went pretty smooth, sounds good... changed the tone. It idles just fine, a little higher than before (maybe 100-150 rpm higher, around 700) and runs really smooth.

However, it has a diesel-like sound to it when idling. It's only really noticeable when I have the hood open, and I'm paranoid about the "piston slap" problem... does the TB/Plenum create a raspier sound under the hood?

It wasn't making that sound before the swap... We hand tightened the plenum but didn't overtighten them IMO..

Beau · Nov 21, 2004

did you leave a vacuum line disconnected or something? i had both on my 03 GT and never had it idle like a diesel motor.

Smeech · Nov 21, 2004

I don't think so.. but I'll double check cracks/missed vacuum lines. Is it possible I don't have the Plenum tightened enough? It's tight, but I didn't want to overtighten it...

I left the stock o-ring on the lower intake manifold when I put on the plenum.. should I just remove it?

myponyrocks · Nov 21, 2004

no, you leave the stock o ring in... I had the same problem, theres a line on the back side I didn't have pushed in all the way and it was leaking slightly

Smeech · Nov 21, 2004

yes, i know which line you're talking about, and it's not in all the way, only halfway. I thought that was enough. I'll check that..

How did everyone else tighten the plenum?

twogts4us · Nov 21, 2004

Smeech said:
How did everyone else tighten the plenum?

Without a torque wrench, just use a small socket wrench and tighten with one hand.

Smeech · Nov 21, 2004

twogts4us said:
Without a torque wrench, just use a small socket wrench and tighten with one hand.

thanks for the quick replies!

Smeech · Nov 21, 2004

well, pushed on the hose in the back as well as I could, and tightened the plenum down better (some bolts did need good tightening) and it sounds fine now.

Beau · Nov 21, 2004

good job

Darkhorse845 · Nov 21, 2004

Yes,good job!

madmatt · Nov 21, 2004

Hows the SOTP gain with them on? Congrats on fixing your prob.

myponyrocks · Nov 22, 2004

no SoTP gains, at least I dont feel em, throttle response is silky smooth now though, and that makes it worth every penny even if I'll only see the increase on the Dyno

twogts4us · Nov 22, 2004

madmatt said:
Hows the SOTP gain with them on? Congrats on fixing your prob.

I really noticed a difference on mine at 3K...it suddenly pulls like it never did before, pulling pretty hard to 6K (it can NEVER pull hard enough ). Below 3K, the difference is minimal. The 3.73s likely make the additional power more noticable.

Smeech · Nov 22, 2004

twogts4us said:
I really noticed a difference on mine at 3K...it suddenly pulls like it never did before, pulling pretty hard to 6K (it can NEVER pull hard enough ). Below 3K, the difference is minimal. The 3.73s likely make the additional power more noticable.

Same here.. plus I like no slack in the throttle. The exhaust has a deeper tone, and the car now sounds mean coming towards you.

Tylerb59 · Nov 22, 2004

YES.

Damnit, I'm having the same problem. I thought I check every connection going in but that diesel sound is / was driving me nuts.

Installed Accufab 75mm TB and Plenum, but now..

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