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Car Forum / Honda Cars / November 2005Good Idea Bad Idea? drive a civic with no compression on a cylinder
As mentioned in previous posts, my sister's 99 civic has a damaged valve on cylinder 3 due to a timing belt breaking. The car is running, albeit poorly due to no compression on cylinder 3. Once you rev it up, it sounds OK. Would it be safe to drive the car across town to a different mechanic in this condition? What are the risks? Or should it be towed? The drive would be in the city, 50 km/h or less, and revved as low as possible. Its about a 14km trip. Please advise. Thanks Terry in Winnipeg and by risks, i mean could we do further damage to the cylinder/piston/valvetrain by driving with no compression and a damaged valve. t >As mentioned in previous posts, my sister's 99 civic has a damaged valve on >cylinder 3 due to a timing belt breaking. The car is running, albeit poorly [quoted text clipped - 10 lines] >Thanks >Terry in Winnipeg > and by risks, i mean could we do further damage to the > cylinder/piston/valvetrain by driving with no compression and a damaged valve. [quoted text clipped - 17 lines] > > -- ------------------------- I'd remove the spark plug wire from the plug and put an old 'dummy' plug on the wire, with the metal part of the plug grounded, so it sparks normally. Otherwise, I doubt anything bad could happen. (the high tension needs to find it's way to ground or it will 'blaze a new trail" inside the cap, or igniter) 'Curly' Curly, not sure what you mean. How could I ground the 'dummy' plug? (IE make it stay grounded while driving the car.) Also, if the gas in the cylinder is not being burned off, wouldn't it cause the oil on the cylinder wall to be washed away, causing potential damage to the rings, and contamination of the engine oil? This is one of the big concerns I have. >> and by risks, i mean could we do further damage to the >> cylinder/piston/valvetrain by driving with no compression and a damaged valve. [quoted text clipped - 10 lines] > >'Curly' > Curly, not sure what you mean. How could I ground the 'dummy' plug? (IE > make it stay grounded while driving the car.) [quoted text clipped - 5 lines] > the rings, and contamination of the engine oil? This is one of the big > concerns I have. This brings me to what I would add - disconnect the injector. Injecting fuel into that cylinder will come to no good. Mike >>> and by risks, i mean could we do further damage to the >>> cylinder/piston/valvetrain by driving with no compression and a damaged [quoted text clipped - 11 lines] >> >>'Curly' >> Curly, not sure what you mean. How could I ground the 'dummy' plug? >> (IE make it stay grounded while driving the car.) [quoted text clipped - 10 lines] > > Mike yes,the unburned fuel will throw off the O2 sensor,and the ECU will misadjust the other cylinders. Better to just leave the spark plug the way it is,not provide a "dummy" plug.  SignatureJim Yanik jyanik at kua.net Thanks for everyones input! I will unplug the injector and leave everything else as is. For a short trip, I doubt it will create any big problems. t >>> Curly, not sure what you mean. How could I ground the 'dummy' plug? >>> (IE make it stay grounded while driving the car.) [quoted text clipped - 7 lines] >Better to just leave the spark plug the way it is,not provide a "dummy" >plug. > yes,the unburned fuel will throw off the O2 sensor,and the ECU will > misadjust the other cylinders. > > Better to just leave the spark plug the way it is,not provide a "dummy" > plug. I'm imagining the combustion chamber pooling up with unburned gas, or would it just shoot out the exhaust valves anyway? >> yes,the unburned fuel will throw off the O2 sensor,and the ECU will >> misadjust the other cylinders. [quoted text clipped - 4 lines] > I'm imagining the combustion chamber pooling up with unburned gas, or > would it just shoot out the exhaust valves anyway? Of course it would get pushed out the exhaust.The cylinder still remains an air pump.A little leakage around a bent valve is not going to stop that. The injectors atomize the liquid,so it will be a burnable fuel-air mix,vapor,not a liquid. SignatureJim Yanik jyanik at kua.net > Curly, not sure what you mean. How could I ground the 'dummy' plug? (IE > make it stay grounded while driving the car.) With one of these, http://tinyurl.com/cb9ky part number 2756 for HEI systems. Eric > and by risks, i mean could we do further damage to the > cylinder/piston/valvetrain by driving with no compression and a damaged valve. > > t -------------------------- The other guys are more correct . . Unplug the injector. No worries about any backfiring, but you might still generate a 'misfire' code, but so what? At least it can't backfire if there's no fuel/air mixture present. I was referring to chassis ground, like any part that's steel. Doesn't matter anyway, but it's worth remembering. Honda spark has to go _somewhere_ or it will go to the wrong places. 'Curly' >> and by risks, i mean could we do further damage to the >> cylinder/piston/valvetrain by driving with no compression and a [quoted text clipped - 14 lines] > > 'Curly' Let it spark in the cylinder,it won't harm anything. No fuel-air mix to burn with an injector disabled,but that does not matter. Those engines(non-Honda) that share a coil between two cylinders do the same thing;allowing a spark in a cylinder with no fuel-air mix. SignatureJim Yanik jyanik at kua.net Is it really worth it to try? What will you save? $50 or less? I wouldn't do it. G-Man > As mentioned in previous posts, my sister's 99 civic has a damaged valve > on [quoted text clipped - 13 lines] > Thanks > Terry in Winnipeg > As mentioned in previous posts, my sister's 99 civic has a damaged valve on > cylinder 3 due to a timing belt breaking. The car is running, albeit poorly [quoted text clipped - 10 lines] > Thanks > Terry in Winnipeg 14k's are no problem. it's just one or two valves a little open - nothing different to a burnt valve. and don't worry about driving normal speed - if anything it'll be better as you'll get less blowback if it's on the intake side. |
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