2001 Pathfinder Codes:p1320 and p0171 - Nissan Forum

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#1 Old May 5th, 2010, 02:26 PM
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2001 Pathfinder Codes:p1320 and p0171

Hello, I have been getting codes p1320 and p0171. Engine was misfiring often. I read hundreds of posts relating to these 2 codes and finally dished out the big $$ replaced all 6 coils, all plugs and air filter. Got MAF sensor cleaner and cleaned MAF. Still the car SES light keeps coming back on after clearing the code. After doing all the work the car has a very rough idle but no crazy shakes like when it misfires. Gas millage is in the toilet, I barely drive 60 miles per day and it seems like it almost takes a quarter tank of gas. I am at a total loss on what to do. Any advise? Thank you.
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#2 Old May 5th, 2010, 06:48 PM
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sounds like you had the right idea. Cleaning the MAF doesn't always work. You also need to clear the self learn and then drive the car once you have repaired the MAF sensor. Make sure you don't use a cheap air filter or you will have the same problem again. As far as your P1320, that is 99% of the time caused by the coils. You may need to verify power and ground to the coils, make sure you don't have an intermitent break in your wire to the ecm too, also check the ground connections on top of the intake manifold. Did you put NGK's back in?
#3 Old May 6th, 2010, 09:13 AM
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Yes, I put in NGKs but not platinum ones, just the regular.
As far as wiring, I am not really sure how to do it all. Is there a diagram of what I need to check and how to check it? I did notice that a lot of the connectors to the coils were very dusty and tough to take out. Perhaps something got pulled? Where exactly are the key spots that I need to check? Thank you very much for your help.

#4 Old May 6th, 2010, 11:55 AM
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I don't know how much you know about electrical. Each coil has battery power supplied to it with the ignition on, ground connection (battery/ engine ground), and a wire leading to the ecm to control the power transistor. It should be labeld on the coils, which terminal is which. You need to get a DVOM to test this stuff. You could have a break in one of your wires. Also recheck all of your connectors to ensure they are fully latched.
#5 Old May 6th, 2010, 12:15 PM
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oil in the plug holes?

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