Power valve keeps going bad...why?

82GT · May 17th, 2008, 06:19 PM

The car is running pig rich at idle and has fouled all the plugs. The last few times it has done this, the PV was blown and without taking the carb bowl off, I'm pretty sure it's blown again.
What makes a PV rupture? I know backfires can cause them to rupture but the car has set all winter with only an occasional start up now and then.
It seems like every year I have to replace it.
The car hasn't been driven on the roads since last summer and now the PV is probably bad again?....it doesn't make sense!
How can a car go from running perfect to running super rich just from setting in a garage for the winter?

JBIGBOOTSY · May 17th, 2008, 11:13 PM

Dirty carb circuts. They will cause a whole range of problems.

tmoss · May 18th, 2008, 10:56 AM

if it was backfiring hard eonough to blow the valve, I'd think you'd know it. Also, depoending on the year carb, it may have the ball-check in the passage to keep from blowing the valve.

ujslost · May 18th, 2008, 11:16 PM

if its an old carb with out the powervalve blowoff, i would but the blow off kit

punkid · May 18th, 2008, 11:24 PM

if it sat all winter the ethonol in the gas now a day eats at the rubber makeing it soft this might be why it goes bad so often

ryans88gt · May 19th, 2008, 03:17 PM

maybe time for some dissasembly and cleaning if you let it sit all winter without at least adding some fuel stabilizer.

May 17th, 2008, 06:19 PM	#1
82GT Regular Join Date: Nov 2006 Location: Danville, Pa. Posts: 324 iTrader: 0 reviews	Power valve keeps going bad...why? The car is running pig rich at idle and has fouled all the plugs. The last few times it has done this, the PV was blown and without taking the carb bowl off, I'm pretty sure it's blown again. What makes a PV rupture? I know backfires can cause them to rupture but the car has set all winter with only an occasional start up now and then. It seems like every year I have to replace it. The car hasn't been driven on the roads since last summer and now the PV is probably bad again?....it doesn't make sense! How can a car go from running perfect to running super rich just from setting in a garage for the winter? __________________ 1982 GT (t-top) 351w(.060),10:3, ported & polished iron heads, 1.94/1.60 valves, BBK shorties & flowmasters, 274XE cam, stealth intake, mallory dizzy, stealth intake, 750dp, Edge 3700 stall converter, C-4, 4:10's Best E.T 12.79@103.55mph

May 18th, 2008, 10:56 AM	#3
tmoss Regular Join Date: Jan 2007 Location: St Louis, Mo Posts: 382 iTrader: 0 reviews	if it was backfiring hard eonough to blow the valve, I'd think you'd know it. Also, depoending on the year carb, it may have the ball-check in the passage to keep from blowing the valve. __________________ 88 GT Vert 5spd, 3:73 gears, Explorer intake/65mm TB, Explorer Ps, Manley race 1.85/1.55 valves, 1.7/1.6 stud rockers, stock cam +4 degrees, MAC Jet-Hot coated shorties. 277RWHP/330RWTQ www.fastlanecars.com http://tmossporting.0catch.com/

May 18th, 2008, 11:16 PM	#4
ujslost MM Fanatic Join Date: Mar 2007 Location: Albertville, AL Posts: 3,920 Blog Entries: 1 iTrader: 1 reviews	if its an old carb with out the powervalve blowoff, i would but the blow off kit __________________ 1986 Mustang GT t-top time piece!

May 19th, 2008, 03:17 PM	#6
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	maybe time for some dissasembly and cleaning if you let it sit all winter without at least adding some fuel stabilizer. __________________ 88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

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May 17th, 2008, 11:13 PM	#2
JBIGBOOTSY MM Fanatic 1990 LX hatch Join Date: Aug 2006 Location: Hobart Indiana Posts: 4,391 iTrader: 0 reviews	Dirty carb circuts. They will cause a whole range of problems.

May 18th, 2008, 11:24 PM	#5
punkid Newbie 1989 lx convertable 11.30 Join Date: Jan 2008 Posts: 19 iTrader: 0 reviews	if it sat all winter the ethonol in the gas now a day eats at the rubber makeing it soft this might be why it goes bad so often

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