Ported Throttle Body PROBLEM!?!?

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Jan 23, 2013 | 10:43 PM

TW14

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From: Dallas Texas

Ported Throttle Body PROBLEM!?!?

Have a 2008 C6. Had the thottle body ported and is now causing some minor issues while operating the car. When I come to a stop the idle begins to slowly climb to 1400rpm and then drop back to normal idle position. Also, when I let of the gas peddle while driving the car it seems like the butterfly is ever so slightly open not allowing the car to slow down while in gear. Also dont get the some back pressure and exhaust noise when letting off the gas. Help would be appreciated.

Jan 24, 2013 | 06:07 AM

06CSIX

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From: dayton ohio

Not normal call whoever ported yours mine ran like stock.

Jan 24, 2013 | 06:51 AM

Don 79 TA

Burning Brakes

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the one from Peak speed in my wife's 05 is fine too

Jan 24, 2013 | 07:56 AM

timd38

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From: Hudson WI

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Is there a vacuum leak?

Jan 24, 2013 | 08:30 AM

jon6.0

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From: Phoenix

It sounds like they went too far porting it.

Jan 24, 2013 | 09:40 AM

ATC399

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Sounds like you need a new throttle body

Jan 24, 2013 | 10:28 AM

TW14

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From: Dallas Texas

I have taken the intire assembly apart and checked it out and re installed. I do not think its a vacuum leak especially since the car was running fine until the TB was installed. I had the GM TB ported by VMAX. I think its ported to much. Sad thing is I spent 12 hours correclty sanding and polishing it and now I will most likely have to do that again.

Jan 24, 2013 | 10:55 AM

madmax4499

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From: tacoma wa

sanding after it was ported?

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Jan 24, 2013 | 10:59 AM

TW14

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From: Dallas Texas

Quote:

Originally Posted by madmax4499

sanding after it was ported?

Yes, only the exterior surface for finish. The inside port was never touched and was taped off.

Jan 24, 2013 | 11:03 AM

#10

madmax4499

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From: tacoma wa

ok, some have great luck with ported TB, some, like you, not so much. you might need to have a tuner look at it.

Jan 24, 2013 | 11:08 AM

#11

TW14

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From: Dallas Texas

Quote:

Originally Posted by madmax4499

ok, some have great luck with ported TB, some, like you, not so much. you might need to have a tuner look at it.

I was informed by my tuner that tuning it is only putting a band aid on the problem which I agree with! The reason I ordered the vmax was to avoid these kind of problems. Guess I will have to start making phone calls.

Jan 24, 2013 | 11:38 AM

#12

AVB

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From: Hayward California

If you still have your old TB, put that back on and confirm it is the new TB.

Jan 24, 2013 | 11:47 AM

#13

TW14

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From: Dallas Texas

Quote:

Originally Posted by AVB

If you still have your old TB, put that back on and confirm it is the new TB.

It was a core exchange. I'm 99% positive if I put the stock TB back on it will eliminate the current problem! Just going to have to get one now.

Jan 24, 2013 | 02:23 PM

#14

SUB VETTE

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From: San Diego CA

I've been running a VMAX ported throttle body for about 5 years with absolutely no problem on my 06. I'd contact VMAX and have them send you a new one.

Jan 24, 2013 | 03:07 PM

#15

TW14

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From: Dallas Texas

Quote:

Originally Posted by SUB VETTE

I've been running a VMAX ported throttle body for about 5 years with absolutely no problem on my 06. I'd contact VMAX and have them send you a new one.

Alot of people have the vmax ported TB and runs fine. Possibly I just got a bad draw. I am going to call the vendor and see if he will send me another. If the the problem continues I will be going back to OEM.

Jan 24, 2013 | 03:13 PM

#16

C5kid

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From: Hershey, PA, USA

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St. Jude Donor '12

They took too much out of the blade area. You can tune it out and it's not a band aid. A simple Idle air adjustment will fix the problem. This sounds dumb, but make sure you still have your gasket in between the TB and intake.

I helped a guy out w/ a high idle problem, turns out he forgot the gasket. We all make dumb mistakes like that once and awhile.

Jan 24, 2013 | 03:25 PM

#17

TW14

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From: Dallas Texas

Quote:

Originally Posted by C5kid

Lol, yeah i have made my fair share of mistakes. But the gasket is still there between the TB and manifold. The car idles correctly just decides to rise to 1400rpm when coming to a stop and drop back down. Find it weird that it idles correctly but is doing that. The car has already been tuned. Not sure that adjustment will help. I have been informed by many they never needed to tune the car after installing a ported TB.

Jan 24, 2013 | 03:30 PM

#18

irok

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From: Oshawa, Ontario

Quote:

Originally Posted by TW14

tried the Vmax ported tb and car ran like crap. it was untuneable.before trying to tune it it would idle at 3200 rpm.

Last edited by irok; Jan 24, 2013 at 03:33 PM.

Jan 24, 2013 | 03:39 PM

#19

TW14

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From: Dallas Texas

Quote:

Originally Posted by irok

tried the Vmax ported tb and car ran like crap. it was untuneable.before trying to tune it it would idle at 3200 rpm.

Wow, thats no good! What did you end up doing? Did the tune help at all?

Jan 24, 2013 | 03:50 PM

#20

irok

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From: Oshawa, Ontario

Quote:

Originally Posted by TW14

Wow, thats no good! What did you end up doing? Did the tune help at all?

had three tuners try to tune it. got the idle down but car not driveable.put stock tb back on and all was good. dont know what the problem was but I would actually like to try another Vmax sometime

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