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08-25-2009, 11:07 PM
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#1 |
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Registered User
Join Date: Apr 2002
Location: Manitoba, Canada
Posts: 663
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Power Brakes - Runs Rough Now
I just finished my power brake install. Stops ok, but my 250 is now running rough. I'm wondering if its a vacuum issue. I put a T fitting on the vacuum port between the carb and the head. The T is connected to the booster and the PCV valve. The little vacuum ports go to the vacuum advance and the AIR pump. It runs rough, especially when accelerating from a stop. Any ideas?
__________________
Present: 2015 Tacoma. Yeah, not a GM, but I love it. 1969 GMC 32,000 - fix, drive, relax, fix... 2019 BMW R1250 GSA - Yahoooooooo 1979 Honda GL 1000 - retro touring at its best. Past: '05 Sierra 4x4 - Had 270,000 KM and running well when it was written-off by a stop sign runner. '94 F-150 from the "F word" company. I'll admit it...good truck. Sold what was left of it for $800 to a guy who came to pick it up at 11:00 PM with cash in hand. Hmm. '79 Sierra Grande (Black) organ donor - perfect rebuildable 4-bolt 350 and a good TH350. '76 Sierra Grande (Orange) - hate isn't too strong a word. Kid who bought it turned it into a hot rod. '68 C-10 R.I.P. - Dad's old truck...too far gone to resurrect. '59 C-50 - with hoist. Truck is gone, wife isn't. Nuff said. |
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08-25-2009, 11:10 PM
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#2 |
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Senior Member
Join Date: Jan 2005
Location: SUNNY WARM BIKE RIDING COTTONWOOD ARIZONA
Posts: 2,097
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Re: Power Brakes - Runs Rough Now
sounds to me like a HUGE vacum leak... try bypassin the PCV and see if it smooths up... bet it does...
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08-26-2009, 01:37 AM
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#3 |
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Registered User
Join Date: Jan 2006
Location: Take Off
Posts: 1,908
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Re: Power Brakes - Runs Rough Now
Vacuum leak. Whatever you did, you created a vacuum leak. Could it be a leaking power booster? I use a Mityvac vacuum pump to test vacuum operated items to see if they are holding vacuum or if they have ruptured diaphrams.
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08-26-2009, 02:04 AM
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#4 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Power Brakes - Runs Rough Now
was it a new booster and new check valve?
__________________
71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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08-26-2009, 06:55 PM
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#5 |
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Registered User
Join Date: Apr 2002
Location: Manitoba, Canada
Posts: 663
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Re: Power Brakes - Runs Rough Now
New check valve, e-bay used booster.
__________________
Present: 2015 Tacoma. Yeah, not a GM, but I love it. 1969 GMC 32,000 - fix, drive, relax, fix... 2019 BMW R1250 GSA - Yahoooooooo 1979 Honda GL 1000 - retro touring at its best. Past: '05 Sierra 4x4 - Had 270,000 KM and running well when it was written-off by a stop sign runner. '94 F-150 from the "F word" company. I'll admit it...good truck. Sold what was left of it for $800 to a guy who came to pick it up at 11:00 PM with cash in hand. Hmm. '79 Sierra Grande (Black) organ donor - perfect rebuildable 4-bolt 350 and a good TH350. '76 Sierra Grande (Orange) - hate isn't too strong a word. Kid who bought it turned it into a hot rod. '68 C-10 R.I.P. - Dad's old truck...too far gone to resurrect. '59 C-50 - with hoist. Truck is gone, wife isn't. Nuff said. |
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08-26-2009, 07:17 PM
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#6 |
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Registered User
Join Date: Jan 2006
Location: Take Off
Posts: 1,908
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Re: Power Brakes - Runs Rough Now
Autozone carries rebuilt boosters for about $100. I recommend you get one. Brakes need to be 100%.
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