Cam And Heads Installed Now A Wierd Noise From Intake?

Sable · September 7th, 2006, 12:51 PM

Helping a friend of mine install his cam and heads. Long story short...
Got it all done and buttoned up but now there is a strange sound coming from the air intake. Sounds like a tuba!! LOL (sorry buddy). We took the thing apart and put it back together a few times and can't seem to figure it out.

New parts are port and polish heads, new cam, new adjustable rockers.

Almost sounds like a gasket vibrating but we have double checked those with no luck.

Any idea's?

itschristorres8 · September 7th, 2006, 02:08 PM

srry buddy i wouldnt know....but tell me how much hp or a differnce u get

99mustang232 · September 7th, 2006, 03:38 PM

what year stang is this... have heard of some getting a strange noise after installing the IAC backwards... but also when you say air intake are you talking about noise coming from the manifold or from the intake air tube? did you recheck the vac lines

99mustang232 · September 7th, 2006, 03:39 PM

also what type of rockers did you install? 1.73 adjustable rollers?

Sable · September 8th, 2006, 09:15 AM

It's a 2002. The noise is generated from the the manifold I believe. We have checked all the vacum lines. Took the CAI off and you can still hear it from the throttlebody. We also to the egr off and still made the noise. Checked the brake booster as well. Taking the upper and lower intake manifolds off again to check for the third time...

Any additional thoughts on what to check?
Not sure on the Rockers...Comp Cam (for sure) 1.73 (not sure)

99mustang232 · September 8th, 2006, 09:40 AM

would probably put money on the IAC causing it, have heard this once on an explorer 4.0L and it sounded very similar to someone blowing across a beer bottle. i would try cleaning it to see but if it doesn't change replace it.

Sable · September 8th, 2006, 04:27 PM

Isn't the IAC on the CAI elbow? If so we took that elbow off (yes no maf, dangerous) and it was still making the noise through the throttle body. One other odd thing... when the car is cold (first start) no noise for a couple minutes until the car heats up and then it starts and stays. Seems to go away momentarily when you punch the throttle (engine sucking air).

99mustang232 · September 8th, 2006, 07:13 PM

the IAT (intake air tempeture) sensor is on the CAI tube, the 99-04 3.8L mustang IAC (idle air control/bypass) is on the side of the upper intake (near passenger rear of enginebay). here is what mine looks like, yours is the same:

IAC pic1
IAC pic2

there is a gasket if you are careful sometimes it can be reused.

also see: http://www.moddedmustangs.com/cleaning-your-iac.html

Sable · September 9th, 2006, 02:24 PM

Going to give it a whirl. Let you all know how it goes.

Sable · September 11th, 2006, 12:16 PM

OK, the problem turned out to be the IAC like you suggested so thank you very much for your help. The tuner had to adjust it when he tuned the car. You guys asked for the results so here they are....

228 rwhp and 238 rwtq
Tuned by Big Shot Dyno out of Akron, Ohio.

I'll post his track times with it after Sept 18th (we'll be up at Norwalk running them)

itschristorres8 · September 11th, 2006, 12:42 PM

nice....what other mods did he have tho...AB almost has that much hp and hes got bolt ons...idk if it rwhp tho..but yea what other mods does he have then?

99mustang232 · September 11th, 2006, 03:24 PM

Originally Posted by Sable

OK, the problem turned out to be the IAC like you suggested so thank you very much for your help. The tuner had to adjust it when he tuned the car.

no problem

Sable · September 11th, 2006, 07:38 PM

He has CAI, shorty headers, UDP, Dual exhaust, Triax shifter, tuned by Big Shot Dyno.....I think that is it. You can see his info over on www.buckeyestangs.com

September 7th, 2006, 12:51 PM	#1
Sable Regular Join Date: Aug 2006 Posts: 101	Cam And Heads Installed Now A Wierd Noise From Intake? Helping a friend of mine install his cam and heads. Long story short... Got it all done and buttoned up but now there is a strange sound coming from the air intake. Sounds like a tuba!! LOL (sorry buddy). We took the thing apart and put it back together a few times and can't seem to figure it out. New parts are port and polish heads, new cam, new adjustable rockers. Almost sounds like a gasket vibrating but we have double checked those with no luck. Any idea's? __________________ 2002 True Blue Mustang GT M5 Check garage for modsStainless Works First prod LTs, X Pipe, Turbo Muffs Dyno-310hp 320T 2004 GTO Dyno–419RWHP 394RWT

September 7th, 2006, 02:08 PM	#2
itschristorres8 I Post Entirely Way Too Much 2000 Mustang V6 unknown @390 Join Date: Aug 2006 Location: south florida Posts: 14,342	srry buddy i wouldnt know....but tell me how much hp or a differnce u get __________________ www.crtperformance.webs.com

September 7th, 2006, 03:38 PM	#3
99mustang232 MM Fanatic 1999 Ford Mustang V6 Join Date: Sep 2005 Location: newport news, va Posts: 3,720	what year stang is this... have heard of some getting a strange noise after installing the IAC backwards... but also when you say air intake are you talking about noise coming from the manifold or from the intake air tube? did you recheck the vac lines __________________ ...even fire and single cammin

September 7th, 2006, 03:39 PM	#4
99mustang232 MM Fanatic 1999 Ford Mustang V6 Join Date: Sep 2005 Location: newport news, va Posts: 3,720	also what type of rockers did you install? 1.73 adjustable rollers? __________________ ...even fire and single cammin

September 8th, 2006, 09:15 AM	#5
Sable Regular Join Date: Aug 2006 Posts: 101	It's a 2002. The noise is generated from the the manifold I believe. We have checked all the vacum lines. Took the CAI off and you can still hear it from the throttlebody. We also to the egr off and still made the noise. Checked the brake booster as well. Taking the upper and lower intake manifolds off again to check for the third time... Any additional thoughts on what to check? Not sure on the Rockers...Comp Cam (for sure) 1.73 (not sure) __________________ 2002 True Blue Mustang GT M5 Check garage for modsStainless Works First prod LTs, X Pipe, Turbo Muffs Dyno-310hp 320T 2004 GTO Dyno–419RWHP 394RWT

September 8th, 2006, 09:40 AM	#6
99mustang232 MM Fanatic 1999 Ford Mustang V6 Join Date: Sep 2005 Location: newport news, va Posts: 3,720	would probably put money on the IAC causing it, have heard this once on an explorer 4.0L and it sounded very similar to someone blowing across a beer bottle. i would try cleaning it to see but if it doesn't change replace it. __________________ ...even fire and single cammin

September 8th, 2006, 04:27 PM	#7
Sable Regular Join Date: Aug 2006 Posts: 101	Isn't the IAC on the CAI elbow? If so we took that elbow off (yes no maf, dangerous) and it was still making the noise through the throttle body. One other odd thing... when the car is cold (first start) no noise for a couple minutes until the car heats up and then it starts and stays. Seems to go away momentarily when you punch the throttle (engine sucking air). __________________ 2002 True Blue Mustang GT M5 Check garage for modsStainless Works First prod LTs, X Pipe, Turbo Muffs Dyno-310hp 320T 2004 GTO Dyno–419RWHP 394RWT

September 8th, 2006, 07:13 PM	#8
99mustang232 MM Fanatic 1999 Ford Mustang V6 Join Date: Sep 2005 Location: newport news, va Posts: 3,720	the IAT (intake air tempeture) sensor is on the CAI tube, the 99-04 3.8L mustang IAC (idle air control/bypass) is on the side of the upper intake (near passenger rear of enginebay). here is what mine looks like, yours is the same: IAC pic1 IAC pic2 there is a gasket if you are careful sometimes it can be reused. also see: http://www.moddedmustangs.com/cleaning-your-iac.html __________________ ...even fire and single cammin

September 9th, 2006, 02:24 PM	#9
Sable Regular Join Date: Aug 2006 Posts: 101	Going to give it a whirl. Let you all know how it goes. __________________ 2002 True Blue Mustang GT M5 Check garage for modsStainless Works First prod LTs, X Pipe, Turbo Muffs Dyno-310hp 320T 2004 GTO Dyno–419RWHP 394RWT

September 11th, 2006, 12:16 PM	#10
Sable Regular Join Date: Aug 2006 Posts: 101	OK, the problem turned out to be the IAC like you suggested so thank you very much for your help. The tuner had to adjust it when he tuned the car. You guys asked for the results so here they are.... 228 rwhp and 238 rwtq Tuned by Big Shot Dyno out of Akron, Ohio. I'll post his track times with it after Sept 18th (we'll be up at Norwalk running them) __________________ 2002 True Blue Mustang GT M5 Check garage for modsStainless Works First prod LTs, X Pipe, Turbo Muffs Dyno-310hp 320T 2004 GTO Dyno–419RWHP 394RWT

September 11th, 2006, 12:42 PM	#11
itschristorres8 I Post Entirely Way Too Much 2000 Mustang V6 unknown @390 Join Date: Aug 2006 Location: south florida Posts: 14,342	nice....what other mods did he have tho...AB almost has that much hp and hes got bolt ons...idk if it rwhp tho..but yea what other mods does he have then? __________________ www.crtperformance.webs.com

September 11th, 2006, 07:38 PM	#13
Sable Regular Join Date: Aug 2006 Posts: 101	He has CAI, shorty headers, UDP, Dual exhaust, Triax shifter, tuned by Big Shot Dyno.....I think that is it. You can see his info over on www.buckeyestangs.com __________________ 2002 True Blue Mustang GT M5 Check garage for modsStainless Works First prod LTs, X Pipe, Turbo Muffs Dyno-310hp 320T 2004 GTO Dyno–419RWHP 394RWT

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