Hi guys,
Vehicle: 2003 Murano SL AWD
Okay, it began with my P0303 misfire cylinder #3 code. I replaced #1 , #3 and #5 coil packs while I was there and the 3 spark plugs with 100,000 mile Iridium's. When I can afford three more coils I can easily throw the other three in without any trouble. I did not split the intake manifold and plenum. I took them off as one piece. I did put a new intake manifold gasket on and a new PCV valve. While I was waiting for parts to arrive I sprayed "Throttle Body and Mass Air Flow" cleaner in the throttle body to clean it out. It wasn't too awfully dirty but enough to warrant a cleaning.
Skipping ahead, after everything was back together I now have an idle speed of about 1,100 to 1,200 RPM and a SES light on. Before I had the code read I was thinking the high idle was probably because I missed reconnecting vacuum hose somewhere. On reassembly I checked, double checked and checked again that I didn't miss anything as I went along but the now high idle I had to have missed a hose somewhere. I have looked and looked, the best that I can anyways with everything back together, and can't see anything I missed. I don't hear any obvious vacuum leak anywhere either. I bought a can of carb cleaner and sprayed it everywhere, including the base of the intake manifold, but noticed no RMP change.
After I had the code read and found it to be P0507. I read on the good ole internet that code is to be expected after you clean out the throttle body and the now high RPM's are because the air flow is faster through the clean throttle body. It also said the idle air volume relearning procedure would resolve it. So that's what I did. After a successful relearning the idle went down to a normal 650ish RPM's.
Here's where I need help.
After driving the murano for about 50 or so miles the light remains on and the idle has worked itself back up to about 1,100-1,200 RPM's. I complete the idle air volume relearning procedure again and the idle returns to normal. After another day and 50 or so more miles the light remains on and the idle climbed back up to 1,000-1,200 range again. Same thing, relearned, idle back to normal, light remains on.
The vehicle runs normal, sounds normal just starts running with a high idle after driving it for a bit. Don't hear any obvious vacuum leaks and carb cleaner sprayed all over, including the base of the intake manifold, did not indicate any leaks. This code and this idle behavior just started with the coil pack replacement repair job. By the way, when re torquing the intake manifold I went in proper order barely snugging each bolt. I then set my torque wrench at the lowest setting it has which is 20 ft pounds and went through the pattern again. That still didn't feel to be enough so I added about 1/4 turn each and left it at that. It calls for 20 to 23 ft pounds so the manifold should be tight enough and the carb cleaner test indicated no leaks.
Being able to get the idle speed down to normal but after driving it for a bit having it returns to high idle again is what is stumping me. Any guidance on where to look next would be great!
Thanks guys.
Vehicle: 2003 Murano SL AWD
Okay, it began with my P0303 misfire cylinder #3 code. I replaced #1 , #3 and #5 coil packs while I was there and the 3 spark plugs with 100,000 mile Iridium's. When I can afford three more coils I can easily throw the other three in without any trouble. I did not split the intake manifold and plenum. I took them off as one piece. I did put a new intake manifold gasket on and a new PCV valve. While I was waiting for parts to arrive I sprayed "Throttle Body and Mass Air Flow" cleaner in the throttle body to clean it out. It wasn't too awfully dirty but enough to warrant a cleaning.
Skipping ahead, after everything was back together I now have an idle speed of about 1,100 to 1,200 RPM and a SES light on. Before I had the code read I was thinking the high idle was probably because I missed reconnecting vacuum hose somewhere. On reassembly I checked, double checked and checked again that I didn't miss anything as I went along but the now high idle I had to have missed a hose somewhere. I have looked and looked, the best that I can anyways with everything back together, and can't see anything I missed. I don't hear any obvious vacuum leak anywhere either. I bought a can of carb cleaner and sprayed it everywhere, including the base of the intake manifold, but noticed no RMP change.
After I had the code read and found it to be P0507. I read on the good ole internet that code is to be expected after you clean out the throttle body and the now high RPM's are because the air flow is faster through the clean throttle body. It also said the idle air volume relearning procedure would resolve it. So that's what I did. After a successful relearning the idle went down to a normal 650ish RPM's.
Here's where I need help.
After driving the murano for about 50 or so miles the light remains on and the idle has worked itself back up to about 1,100-1,200 RPM's. I complete the idle air volume relearning procedure again and the idle returns to normal. After another day and 50 or so more miles the light remains on and the idle climbed back up to 1,000-1,200 range again. Same thing, relearned, idle back to normal, light remains on.
The vehicle runs normal, sounds normal just starts running with a high idle after driving it for a bit. Don't hear any obvious vacuum leaks and carb cleaner sprayed all over, including the base of the intake manifold, did not indicate any leaks. This code and this idle behavior just started with the coil pack replacement repair job. By the way, when re torquing the intake manifold I went in proper order barely snugging each bolt. I then set my torque wrench at the lowest setting it has which is 20 ft pounds and went through the pattern again. That still didn't feel to be enough so I added about 1/4 turn each and left it at that. It calls for 20 to 23 ft pounds so the manifold should be tight enough and the carb cleaner test indicated no leaks.
Being able to get the idle speed down to normal but after driving it for a bit having it returns to high idle again is what is stumping me. Any guidance on where to look next would be great!
Thanks guys.
