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Author
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Topic: Possible air leak source
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Maxstang
Senior Member Posts: 83
From:LA
Registered: Jun 99
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posted 03-09-2000 12:04 AM
   
Some of you may know I'm fighting what appears to be a manifold leak that only appears when the engine warms up. The leak appears to be very minor and manifests itself mostly as an increased surge at low RPMs. I had a thought today and thought I'd run it past you. I have ARP stainless bolts and washers on my aluminum intake. The washers don't compress like the copper stock ones. Is it possible I'm getting leaks at the intake bolts themselves when they heat up? I know I'm grasping but I'm stuck. -MaxIP: 205.188.199.166 |
John Z
Senior Member Posts: 104
From:Morgantown, WV
Registered: Jul 99
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posted 03-09-2000 08:10 AM
If the washers are not sealing there would be a vacuum leak right? On Shade Tree Mechanic they showed using a propane bottle, like used for a plumber solderer, to sniff out vacuum leaks. You release some propane near where you think the leak is and if the propane is sucked in, the speed of the engine will increase. I think this is the process, may be others can comment. IP: 157.182.80.226 |
Clark
Senior Member Posts: 236
From:Rowlett,Texas
Registered: Aug 99
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posted 03-09-2000 09:54 AM
John, that will work or you could just use starting fluid and squirt it around the bolts and other intake areas. ------------------
69 351W Sportsroof Deluxe IP: 208.238.117.2 |
Maxstang
Senior Member Posts: 83
From:LA
Registered: Jun 99
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posted 03-09-2000 12:40 PM
Thanks guys. I've tried the carb cleaner bit on the bolts but my leak is so subtle that it doesn't affect idle much at all. I think I'll try using some copper washers and see what happens. -MaxIP: 152.163.197.176 |
georgeb
Moderator Posts: 793
From:Solomons, MD, USA
Registered: Jun 99
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posted 03-09-2000 03:27 PM
If you have power brakes, check the hose to the booster, the manifold fitting for said hose, the booster check valve for cracks, the booster check valve grommet for sealing, etc.If you have a vacuum advance distributor, check the diaphram and pot for leakage, and of course the vacuum line/hose. Also, remove carb and check the mounting flange for warpage, and the gasket and manifold surface for a possible leak source. I doubt if it's the intake manifold bolts/washers; if you put the manifold on without using guide studs and the gasket wasn't fixed to the heads with sealer, a gasket probably slipped. IP: 198.23.5.73 |
Moneymaker
Administrator Posts: 3668
From:Lyons, il, USA
Registered: May 99
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posted 03-09-2000 10:02 PM
Max did you try the ATF trick?  Alex------------------
Alex Denysenko Co-Administrator and Moderator
IP: 152.163.195.183 |
Maxstang
Senior Member Posts: 83
From:LA
Registered: Jun 99
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posted 03-10-2000 02:13 AM
Not yet Alex. I was rejetting the carb (a tad richer) maybe I'll try it this week.-Max PS. My tuner thinks I'm worrying too much and thinks this is just the way it's going to run when hot. IP: 205.188.201.57 |
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