Hi, I have a 2001 QX4 that started running rough and the engine light came on. Codes were P0301 and P1140. The 1140 was for the cam sensor, which I replaced assuming that was causing the rough running. I cleared the codes and it runs exactly the same.
I just wanted to ask in case there are common causes for a P0301 because checking the fuel and even the spark requires removal of quite a bit of junk. Thanks all!
Common misfire causes?
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sidescrollin
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Chuck Tribolet
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Re: Common misfire causes?
P0301 is usually a bad coil on the number 1 cylinder. Unfortunately, on an '01 the number 1 coil is different from the other five, so you can't do a swap and see if the bug moves.
P1140 generally doesn't cause a bad misfire.
What codes do you still have?
Chucj
P1140 generally doesn't cause a bad misfire.
What codes do you still have?
Chucj
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sidescrollin
- Posts: 16
- Joined: Thu May 06, 2010 5:18 pm
- Car: 1992 M30 Convertible 3.0 *sold
1988 jaguar XJS 5.3
1997 pathfinder 3.3 *blown engine
Re: Common misfire causes?
I only have the P0301. Glad you told me about the coil, I definitely would've tried it. Any other way to test instead of just replacing it?
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Chuck Tribolet
- Posts: 1490
- Joined: Mon Nov 24, 2008 3:15 pm
- Car: '01 Nissan Pathfinder
'87 Chevy Corvette
'01 Toyota Camry daily driver
'98 Boston Whaler Montauk - Location: Morgan Hill, CA and Marina, CA
- Contact:
Re: Common misfire causes?
Find a buddy with an '01 PF and swap. I think those coils were only used on the the '01, at least in the PF/Q
Chuck
Chuck