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Car Forum / Honda Cars / August 2006locating a vaccuum leak
New to the list here. From what I've read it seems you folkz are pretty informed. So here's my situation: I have a '96 civic DX HB with about 85k miles. last week, literally hours before I was gonna have her inspected, the check engine light comes on. Following the guidance I've gleamed from here, I took it to advanced auto and had them run the diagnostic. The resulting code reads: P0420 Catalyst Efficiency Below Threshold (Bank 1) the lady who ran the diagnostic, said it was a vaccuum leak. So my question to the group is; a) does this code give any indication of where the leak is? if so, can you tell me where or point me to a resource that can. b) how does one go about checking the vaccuum on individual lines? thanks in advance,  Signaturegrizzman1 http://www.automotiveforums.com > New to the list here. From what I've read it seems you folkz are pretty > informed. [quoted text clipped - 14 lines] > resource that can. b) how does one go about checking the vaccuum on > individual lines? You can usually hear a vacuum leak - listen for a whistling or hissing noise under the hood while at idle. For an example, blow through a small straw - it will likely sound something like that. If you can hear the leak, but are having trouble locating it, use a pair of needlenose pliers to (gently!) pinch off each hose until the sound goes away - that will be your faulty hose, or the hose running to a faulty vacuum device (sometimes the diaphragms in vacuum-operated devices can become leaky). Hope that helps.. The problem is more likely a worn out catalytic converter. There is a slight possibility that an O2 sensor is bad. You will need a lot more knowledge to troubleshoot the problem. You can spend a fortune throwing parts at it for that code. There may be secondary codes in the computer that will further define the problem. These you won't get from a parts store. I advise taking it to a good mechanic and have it diagnosed properly. > New to the list here. From what I've read it seems you folkz are pretty > informed. [quoted text clipped - 16 lines] > > thanks in advance, > New to the list here. From what I've read it seems you folkz are pretty > informed. [quoted text clipped - 14 lines] > resource that can. b) how does one go about checking the vaccuum on > individual lines? Not a vacuum leak, but an AIR leak in the exhaust between the primary O2 sensor and the front of the cat. A garage that can do a "smoke test" can eliminate this as a possibility. Sometimes this is due to a cracked exhaust manifold, which is what creates the air leak. Smoke test applies here too. Many times it IS actually a cat that is not condensing as it should, and needs to be replaced. What sort of driving do you do? Lots of low-speed city? A mix? SignatureTeGGeR® The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ |
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