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Car Forum / Honda Cars / November 2005symptoms of a clogged cat converter
Got a phone call from a friend who is looking to buy a used 1990 Civc with 100K. MT and the car has been well maintained. The seller says the cat converter is "going bad and the exhaust is blowing by the converter". I doubted that even being posible unitl I looked at my service manual. I see that the exhaust manifold goes to " EX pipe A" which connects to "MIDDLE EX PIPE" which is fastened to the cat converter with a set of bolts that are spring loadd. Could exhaust gas bypass a clogged converter in this manor? I will be taking a look at this car Friday afternoon and thought I would ask if anyone in the group has seen this before. My first thought was the gasket had failed, or the middle exhaust pipe had cracked. I haven't done any work that far up the exhaust train since I quite ridding motorcycles. Seeing a set of spring loaded bolts holding the converter to the middle exhaust pipe surprised me. I plan using a longish tube to listen for the leak to pin point it. I don't think it wise to try to feel for hot exhaust gasses. Terry > Got a phone call from a friend who is looking to buy a used 1990 Civc > with 100K. [quoted text clipped - 26 lines] > > Terry if the cat really is clogged, i'd be beware of buying the car because it will either have had a serious injection problem /or/ will have spent its whole life pottering about on 3 mile journeys where the engine never got hot. both scenarios wreck a motor pdq. otoh, it may be just a blowing exhaust, in which case, it's easily fixed and the problem goes away. inspection will reveal all. and if your friend still wants to take their chances on whether the motor was in 3 mile heck, make sure the easy things are fixed like ignition, o2 sensor, etc., change the oil, makes sure there are no coolant leaks, /then/ take the car on a good hard run on some nice steep hills. red line, full throttle. that will burn out a bunch of the accumulated carbon from the engine and the cat. you'd be amazed how much better it can be after a couple of hundred miles of running at "full working temperature". then change the oil again. > if the cat really is clogged, i'd be beware of buying the car because it > will either have had a serious injection problem /or/ will have spent [quoted text clipped - 14 lines] > > then change the oil again. ++++++++++++++++++++++++++++++++++++++++++++++ The inspection will have to wait until the middle of next week. I managed to scratch my cornea with an allen wrench today. Don't ask, it was rather silly and it hurts like hell so I learned a valued leason. I was using my hand and "pounding" on a 3/8" allen over my head, it slipped out of the screw and spun nto my eay. Ouch! on steroids. No permanent damage, but the pain is too real. I wondered why they, ER MD, gave me so many and such "pain pills". About 5:00 I learned why. My wife says the patch reveals the true me. And my idiot cat stays about 15' away and just looks at me in a truely unique way. Terry Cats are either plugged or poisened. The former is tested by a vacuum gauge, the latter by your state emmissions test. |
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