darylz Posted November 23, 2005 Share Posted November 23, 2005 I am looking at a used 98 Outback with 154k miles on it from a dealers lot. I took it to a local AutoZone to check on a check engine code and it comes back with "injector voltage low on #4 injector". Looking on some searches I see that #4 cylinder is the one where most head gaskets fail. Could these be related? Has anyone ever troubleshot a low voltage problem on an injector? Where should I begin to check on this problem? Thanks in advance. Quote Link to comment Share on other sites More sharing options...
Adnan Posted November 23, 2005 Share Posted November 23, 2005 Hi, I don't think that there is any correlation between an injector driver problem and leaking head gaskets. A "low voltage" code suggests that the IGBT that is driving the injector is either bad or there's a loose connection someplace. Unfortunately, I'm not familiar with that model to tell you where the drivers are located. Have you checked the Haynes manual? Regards, Adnan Quote Link to comment Share on other sites More sharing options...
nipper Posted November 23, 2005 Share Posted November 23, 2005 Myabe a bad injector ... electrically i can imagine how a bad injector coil would give a low voltage reading. The injector and head gasket are not related. nipper Quote Link to comment Share on other sites More sharing options...
Cougar Posted November 23, 2005 Share Posted November 23, 2005 If you have a ohmmeter available you can check the resistance of the injector coil and compare it to another good one. I think the resistance should be between 2 and 12 ohms. Clean the connections also, as that may be the problem. Quote Link to comment Share on other sites More sharing options...
darylz Posted November 25, 2005 Author Share Posted November 25, 2005 This car is in Florida and I found it while on vacation. I am thinking of driving it to Ohio and fixing it there. Do you guys think it would be OK to drive it like that to Ohio? Would that injector just not deliver enough fuel to that cylinder while the problem is there? Does anyone know how exactly I can check the injector coil, or the voltage at the injector and where it comes from to check for a bad connection? I have a VOM with me here. Thanks again. Quote Link to comment Share on other sites More sharing options...
nipper Posted November 25, 2005 Share Posted November 25, 2005 compare good injectors to the weak one. Check the resistance of the injector. They arent terribly expenisve if you research it to replace just the one. Worst thing its going to do is maybe give you a miss or a rough idle i would think. nipper Quote Link to comment Share on other sites More sharing options...
darylz Posted November 25, 2005 Author Share Posted November 25, 2005 compare good injectors to the weak one. Check the resistance of the injector. They arent terribly expenisve if you research it to replace just the one. Worst thing its going to do is maybe give you a miss or a rough idle i would think. nipper How exactly do I check the resistance of an injector? I have never checked one before. Thanks for your replies. Quote Link to comment Share on other sites More sharing options...
Tiny Clark Posted November 25, 2005 Share Posted November 25, 2005 You carefully pull the connector off of the injector, and put the meter leads on the pins of the injector. There are two of them, and it doesn't matter which way you hook them up. Compare that reading to another one of the injectors. If it's the same, then maybe the ECU is not working properly. Quote Link to comment Share on other sites More sharing options...
nipper Posted November 25, 2005 Share Posted November 25, 2005 can also be a dirty electrical connector, The action of unploging and pluging in the injector may clear it up ... Also check both to ground just to make sure there is no voltage leakage. Should be zero ohms to ground. nipper Quote Link to comment Share on other sites More sharing options...
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