jaredfrompcola Posted June 20, 2012 Share Posted June 20, 2012 I hope I explain this right. I got my valve covers done. First I got the passenger side done and week later got the driver side done. After I got the driver side done my check engine light came on. Nothing seemed to happen to the pathy, everything seems ok. Well I took it back and found that the vacuum lines had a crack so they replaced several lines. Light went off but after two miles light came back on and I took truck back and they told me that the computer has to reset and it takes some time driving for the light to go out. Just wonder if this sounds right or does this seem fishy. Link to comment Share on other sites More sharing options...
ahardb0dy Posted June 20, 2012 Share Posted June 20, 2012 Check the computer for codes to see what might be causing the check engine light to come on Link to comment Share on other sites More sharing options...
jaredfrompcola Posted June 20, 2012 Author Share Posted June 20, 2012 They checked the codes and it told them vacuum was the problem. They changed the lines.The mechanic told me that you have to drive at a certain speed for some much time to reset the computer. Link to comment Share on other sites More sharing options...
Slartibartfast Posted June 20, 2012 Share Posted June 20, 2012 I don't think there even is a code for vac leak... they may have seen other codes that they decided indicated a vac leak, but I've never heard of the computer knowing a vac leak when it sees one. Resetting the computer is dead simple... disconnect the battery for a couple minutes. Maybe turn the lights on/off, put the key to 'on,' just to make sure anything stored is gone. Then hook it back up and presto, it's got amnesia. I've never heard that about it resetting itself if driven at a certain speed. Check the codes yourself. There's a great writeup on here (in the how-to section IIRC). I have no idea what your mechanic is talking about, but it does sound iffy. The code will tell you which sensor is reading funny, and from there you can figure out what the actual problem is. My bet is that they bumped an electrical connection when they did the valve cover, and it's making intermittent contact. If the computer says there's a sensor or something that's wrong near there, maybe try checking/cleaning the electrical plugs and things around that side. Link to comment Share on other sites More sharing options...
Alkorahil Posted June 20, 2012 Share Posted June 20, 2012 http://www.nissanpathfinders.net/forum/topic/21-ecu-self-diagnostics-for-87-95-pathfinder/ Link to comment Share on other sites More sharing options...
1994SEV6 Posted June 21, 2012 Share Posted June 21, 2012 I am suspicious that the ECU resets itself at a certain speed, but it does "learn" and adjust certain things when you restart the vehicle. For example, it can adjust to different oxygen levels in different altitudes. There are methods here for checking codes and checking for vacuum leaks. Read and report back! Link to comment Share on other sites More sharing options...
Alkorahil Posted June 21, 2012 Share Posted June 21, 2012 I am suspicious that the ECU resets itself at a certain speed, but it does "learn" and adjust certain things when you restart the vehicle. For example, it can adjust to different oxygen levels in different altitudes. There are methods here for checking codes and checking for vacuum leaks. Read and report back! I belive they are thinking of OBD-II or III that will do some 'relearning' by starting to log a new set of data history after being cleared............ Link to comment Share on other sites More sharing options...
jaredfrompcola Posted June 23, 2012 Author Share Posted June 23, 2012 I belive they are thinking of OBD-II or III that will do some 'relearning' by starting to log a new set of data history after being cleared............ Alk how long does that take. I been driving several days and light still on. If it does not go off I am going back so they can do more work on vac. lines. I hate seeing the engine light on even though it is not hurting the truck. Link to comment Share on other sites More sharing options...
ejin4499 Posted June 23, 2012 Share Posted June 23, 2012 Something isn't adding up. We need more information. Pull your codes and post back. That might give us the info that makes this all work. Link to comment Share on other sites More sharing options...
Alkorahil Posted June 25, 2012 Share Posted June 25, 2012 (edited) Alk how long does that take. I been driving several days and light still on. If it does not go off I am going back so they can do more work on vac. lines. I hate seeing the engine light on even though it is not hurting the truck. Your vehicle isnt OBD-II.......... But if it was, it would take about 15 minutes of continuous driving..... Edited June 25, 2012 by Alkorahil Link to comment Share on other sites More sharing options...
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