Vacuum/Timing
September 16th, 2018, 03:12 PM
#42
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Update
I’m still around 15” of vacuum. At idle it looks like about 12 degrees. It isn’t a very smooth idle and I ordered a carb rebuild kit. I’ve sprayed carb cleaner everywhere looking for a leak but I’m coming up empty.
Back of my mind keeps telling me there’s something wrong with the brake booster; I say that because I have to apply a lot of pressure. I’ve blown through the vacuum piece when removed and it does pass air the correct way. Looking for more ideas as to why the vacuum numbers are low
I’m still around 15” of vacuum. At idle it looks like about 12 degrees. It isn’t a very smooth idle and I ordered a carb rebuild kit. I’ve sprayed carb cleaner everywhere looking for a leak but I’m coming up empty.
Back of my mind keeps telling me there’s something wrong with the brake booster; I say that because I have to apply a lot of pressure. I’ve blown through the vacuum piece when removed and it does pass air the correct way. Looking for more ideas as to why the vacuum numbers are low
September 16th, 2018, 03:44 PM
#43
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If you suspect the booster, pull the vacuum line, plug it so there's no engine vacuum leak, then see if you still have the low vacuum.
Alternately, you can pinch the rubber line shut with the proper pliers to get the same effect.
Alternately, you can pinch the rubber line shut with the proper pliers to get the same effect.
September 16th, 2018, 08:18 PM
#45
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September 17th, 2018, 04:48 AM
#47
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You have to plug the hose when you remove it from the booster. If the vacuum advance was hooked to manifold vacuum prior to you capping it off, you will need to raise your curb idle speed to compensate.
September 17th, 2018, 07:25 AM
#48
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September 17th, 2018, 01:38 PM
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Seems like I need to start from square one. After I replaced the balancer and stuff I kept the hei dist where it was at. At idle it was about 16 degrees(idle plate stops at 12 so I’m guesstimating). I increased idle to ~3000rpm and used my dial light to set at 0 based off what I’ve read on the net.
After that the idle seemed low, wasn’t smooth just like before with the same, if not worse vacuum readings. Air/mixture doesn’t seem to change anything unless both are fully closed.
I hear what sounds like a vacuum leak on the driver’s side but the carb spray method doesn’t seem to affect idle.
What should normally happen when you pull the booster hose without plugging it? How about when you plug it?
After that the idle seemed low, wasn’t smooth just like before with the same, if not worse vacuum readings. Air/mixture doesn’t seem to change anything unless both are fully closed.
I hear what sounds like a vacuum leak on the driver’s side but the carb spray method doesn’t seem to affect idle.
What should normally happen when you pull the booster hose without plugging it? How about when you plug it?
September 17th, 2018, 02:15 PM
#51
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Seems like I need to start from square one. After I replaced the balancer and stuff I kept the hei dist where it was at. At idle it was about 16 degrees(idle plate stops at 12 so I’m guesstimating). I increased idle to ~3000rpm and used my dial light to set at 0 based off what I’ve read on the net.
You lost me on what your doing here.
After that the idle seemed low, wasn’t smooth just like before with the same, if not worse vacuum readings. Air/mixture doesn’t seem to change anything unless both are fully closed.
I hear what sounds like a vacuum leak on the driver’s side but the carb spray method doesn’t seem to affect idle.
Raise the idle to 750RPM. Find the vacuum leak.
What should normally happen when you pull the booster hose without plugging it? How about when you plug it?
You lost me on what your doing here.
After that the idle seemed low, wasn’t smooth just like before with the same, if not worse vacuum readings. Air/mixture doesn’t seem to change anything unless both are fully closed.
I hear what sounds like a vacuum leak on the driver’s side but the carb spray method doesn’t seem to affect idle.
Raise the idle to 750RPM. Find the vacuum leak.
What should normally happen when you pull the booster hose without plugging it? How about when you plug it?
September 17th, 2018, 05:14 PM
#54
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September 17th, 2018, 07:15 PM
#56
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Great thanks! I adjusted the idle and the car is running pretty good on the road. I plugged the booster line after increasing the idle and it doesn’t stall
Still feels like the brake pedal is really hard
Still feels like the brake pedal is really hard
Last edited by Mossy; September 17th, 2018 at 10:37 PM.
September 19th, 2018, 06:51 AM
#58
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