Belt chirp on shifting

militant54 · January 19th, 2008, 09:59 PM

Ok, when I go WOT or near WOT, then let off the gas a little before shifting, it sounds like I have some sort of belt chirp. When I go WOT and shift still in WOT, no chip. Never any other squealing or squeeking. Why is it doing this? I'm thinking belt actually runs over a pulley because it can't slow down as fast as the engine did? Does that make sense? Any ideas and how to fix? Brand new belt btw.

Just curious, I tell people it's my turbo blow off right now.....

HMUSN · January 19th, 2008, 10:03 PM

hows the tensioner pulley look?

militant54 · January 19th, 2008, 10:09 PM

Looks good to me, looks and feels very tight.....but I'm no mechanic. (actually, a mechanic told me it looked great 1k miles ago.

cruiSSin LS1 · January 21st, 2008, 12:26 AM

Originally Posted by militant54

Ok, when I go WOT or near WOT, then let off the gas a little before shifting, it sounds like I have some sort of belt chirp. When I go WOT and shift still in WOT, no chip. Never any other squealing or squeeking. Why is it doing this? I'm thinking belt actually runs over a pulley because it can't slow down as fast as the engine did? Does that make sense? Any ideas and how to fix? Brand new belt btw.

Just curious, I tell people it's my turbo blow off right now.....

id unno

militant54 · January 24th, 2008, 11:12 PM

Any ideas?

StangMod · February 6th, 2008, 01:29 AM

my car with an sct tuner does the same thing on the 1-2 shift at WOT. i wouldn't worry about unless it happens when at partial throttle.

militant54 · April 4th, 2008, 11:46 AM

Any other ideas? It's driving me nuts and I can't trace it....

It doesn't do it AT constant WOT, only when I hit it hard in WOT and release from the gas, then when if shifts, it chirps....well, almost screams.

MIKE 04 GT · April 7th, 2008, 01:20 PM

both my 2002 and 2004 gt have done this the ford dealership said that is something thay do with the mod motor to keep the belt from braking. i dont know if that is true or not. also my f150 did the same thing.

00redgt · April 7th, 2008, 01:28 PM

sounds like the belt is slipping mine does that,no biggie

militant54 · April 7th, 2008, 01:45 PM

Think my belt might be a little too big? It really seems like when I let off, the engine drops rpms so fast that the belt keeps going and slips a bit. It's loud enough sometimes that people duck like they're being shot at.

January 19th, 2008, 09:59 PM	#1
militant54 Regular Join Date: Oct 2006 Posts: 177 iTrader: 1 reviews	Belt chirp on shifting Ok, when I go WOT or near WOT, then let off the gas a little before shifting, it sounds like I have some sort of belt chirp. When I go WOT and shift still in WOT, no chip. Never any other squealing or squeeking. Why is it doing this? I'm thinking belt actually runs over a pulley because it can't slow down as fast as the engine did? Does that make sense? Any ideas and how to fix? Brand new belt btw. Just curious, I tell people it's my turbo blow off right now..... __________________ 1998 Mustang GT Convertible, black on black on black with MAC prochamber H, Flowmasters, PI intake, SCT tune, K&N.

January 19th, 2008, 10:03 PM	#2
HMUSN Doc 1986 SVO Join Date: Nov 2006 Posts: 36,836 iTrader: 9 reviews	hows the tensioner pulley look? __________________

January 19th, 2008, 10:09 PM	#3
militant54 Regular Join Date: Oct 2006 Posts: 177 iTrader: 1 reviews	Looks good to me, looks and feels very tight.....but I'm no mechanic. (actually, a mechanic told me it looked great 1k miles ago. __________________ 1998 Mustang GT Convertible, black on black on black with MAC prochamber H, Flowmasters, PI intake, SCT tune, K&N.

January 24th, 2008, 11:12 PM	#5
militant54 Regular Join Date: Oct 2006 Posts: 177 iTrader: 1 reviews	Any ideas? __________________ 1998 Mustang GT Convertible, black on black on black with MAC prochamber H, Flowmasters, PI intake, SCT tune, K&N.

April 4th, 2008, 11:46 AM	#7
militant54 Regular Join Date: Oct 2006 Posts: 177 iTrader: 1 reviews	Any other ideas? It's driving me nuts and I can't trace it.... It doesn't do it AT constant WOT, only when I hit it hard in WOT and release from the gas, then when if shifts, it chirps....well, almost screams. __________________ 1998 Mustang GT Convertible, black on black on black with MAC prochamber H, Flowmasters, PI intake, SCT tune, K&N.

February 6th, 2008, 01:29 AM	#6
StangMod Newbie Join Date: Feb 2008 Posts: 9 iTrader: 0 reviews	my car with an sct tuner does the same thing on the 1-2 shift at WOT. i wouldn't worry about unless it happens when at partial throttle.

April 7th, 2008, 01:20 PM	#8
MIKE 04 GT Regular 04 MUSTANG GT 14.5 @ 97.2 Join Date: Oct 2007 Location: SC Posts: 312 iTrader: 0 reviews	both my 2002 and 2004 gt have done this the ford dealership said that is something thay do with the mod motor to keep the belt from braking. i dont know if that is true or not. also my f150 did the same thing.

April 7th, 2008, 01:28 PM	#9
00redgt MM Fanatic 2000 mustang gt Join Date: Oct 2007 Location: vansant,va Posts: 4,073 iTrader: 5 reviews	sounds like the belt is slipping mine does that,no biggie __________________

April 7th, 2008, 01:45 PM	#10
militant54 Regular Join Date: Oct 2006 Posts: 177 iTrader: 1 reviews	Think my belt might be a little too big? It really seems like when I let off, the engine drops rpms so fast that the belt keeps going and slips a bit. It's loud enough sometimes that people duck like they're being shot at. __________________ 1998 Mustang GT Convertible, black on black on black with MAC prochamber H, Flowmasters, PI intake, SCT tune, K&N.

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