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Car Forum / Honda Cars / October 2007Do I need to replace my intake manifold?
My 94 Civic has the check engine light on. Mechanic says its the O2 sensor, which sounds reasonable. However, he says that the sensor is essentially melted onto the intake manifold, so that the IM needs to be replaced too. Does this make any sense? The IM replacement is way more expensive. Thoughts? > My 94 Civic has the check engine light on. Mechanic says > its the O2 > sensor, which sounds reasonable. You should be able to get the code read at an Autozone at no charge. The code may indicate a problem with the O2 sensor, but this does not mean it must be replaced. Are their symptoms of rough running when the car is driven? Your car certainly is old enough that the O2 sensor may be failing. > However, he says that the sensor is > essentially melted onto the intake manifold, so that the > IM needs to > be replaced too. The O2 sensor is mounted on the exhaust manifold. It monitors the oxygen content of /exhaust/ gases and sends a signal to the engine control system to maximize engine (fuel burning) efficiency and minimize pollution. Has your mechanic actually put a wrench to the sensor and tried to remove it? If it seems the sensor has failed, and if you are the least bit handy, I would take off the exhaust manifold shield (and maybe any other small interference of parts), soak the O2 sensor's threads as best I could with the penetrating oil "PB Blaster" (around $5 a can at Autozone and Wal-Mart). Then I'd borrow an O2 sensor wrench from Autozone (no charge) and try to remove it. If you can remove it, you can buy an OEM sensor online and replace it yourself. Here's a drawing of the O2 sensor location: http://www.hondaautomotiveparts.com/auto/jsp/mws/prddisplay.jsp?inputstate=5&cat cgry1=Civic&catcgry2=1994&catcgry3=4DR+DX&catcgry4=KA5MT&catcgry5=EXHAUST+MANIFO LD+%281%29 Great and inexpensive OEM O2 sensors: https://www.automedicsupply.com/ For most 1994 Civics, the sensor costs about $70 at this site. Raul <alpesh.patel@gmail.com> wrote in news:1193161768.823097.114530 @t8g2000prg.googlegroups.com: > My 94 Civic has the check engine light on. Mechanic says its the O2 > sensor, which sounds reasonable. However, he says that the sensor is > essentially melted onto the intake manifold, so that the IM needs to > be replaced too. Does this make any sense? The IM replacement is way > more expensive. As Elle says, the sensor is in the EXHAUST manifold. Mechanic should reset the Check Engine light and simply wait to see if it comes on again. Often the problem will not recur. It is important that you specify the actual numeric code that was registered. Even if the sensor does actually need to be replaced and is seized in the manifold, you can still just wind it out of the hole, then re-cut the threads in the manifold with a spark plug tap. A lot easier and cheaper than a new exhaust manifold!  SignatureTegger The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ > My 94 Civic has the check engine light on. Mechanic says its the O2 > sensor, which sounds reasonable. However, he says that the sensor is > essentially melted onto the intake manifold, so that the IM needs to > be replaced too. Does this make any sense? The IM replacement is way > more expensive. --------------------------- Your diagrams are at www.slhondaparts.com You want to look at the exhaust manifold. prices are there too. 'Curly' > My 94 Civic has the check engine light on. Mechanic says its the O2 > sensor, which sounds reasonable. However, he says that the sensor is [quoted text clipped - 3 lines] > > Thoughts? Just to add to what Tegger and Elle have already said... it sounds like either you misunderstood your "mechanic", or he's simply an idiot. I'd get a second opinion before proceeding. > > My 94 Civic has the check engine light on. Mechanic says its the O2 > > sensor, which sounds reasonable. However, he says that the sensor is [quoted text clipped - 8 lines] > > I'd get a second opinion before proceeding. Going just by the numbers, the sensor is probably thoroughly stuck in the exhaust manifold, and either the mechanic or the OP misspoke. On the other hand, if the sensor really is melted into the intake manifold, he definitely needs some serious repairs. > My 94 Civic has the check engine light on. Mechanic says its the O2 > sensor, which sounds reasonable. However, he says that the sensor is [quoted text clipped - 3 lines] > > Thoughts? Like everybody said, it's probably stuck into the exhaust manifold, and it's probably more feasible to remove it with penetrating oil, heat, and brute force than replace the manifold. Because if it's stuck, then i can guarantee you that the mounting studs and nuts for the manifold to the head and the catalytic converter are going to be equally stuck, and there are more of them than just the one sensor, and it's less feasible to just destroy them to get them out and replace them than it is with the sensor. |
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