Engine Runs rough

PAULBENAVENT

MEMBER
2004 NISSAN TITAN
5.6L
V8
2WD
AUTOMATIC
184,000 MILES

Thanks in advance for your help.

It seems one of my pistons is not firing. I replaced the;
Battery, ignition coil (it was burnt) and there was oil all over the tip of the ignition coil. I changed the spark plugs and the battery. Occasionally I will change the spark plug in cylinder number four and it seems to run great for about ten minutes then back to misfiring.
I feel like there is a problem getting power to some part. Maybe a fuse oh, I do not know.

I had the computer connected to a code reader and came up with the following codes:
(PO 335) Crankshaft sensor "A" also
(PO 223) Throttle pedal position sensor switch 2 PCM is too high.
(PO222) Voltage low throttle position or sensor.
(PO123) Throttle position sensor.
(P1051) Amperage in heated air flow sensor low.
(P0335) Crankshaft position sensor "B".
(P1051) Amperage in the heated air fuel ratio sensor low.

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Hello,

Lets clear the codes and then just turn the key on without starting the engine then run the codes again to see what comes up. If no codes start the engine then shut it off and run the codes again. We are trying to see which code is most prevalent.

Here is a guide:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Also lets do a compression test.

https://www.2carpros.com/articles/how-to-test-engine-compression

Please run down these guides and report back.

Cheers, Ken

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Wednesday, December 12th, 2018 AT 10:33 AM

PAULBENAVENT

MEMBER
5 POSTS

Thank you very much for your reply Ken and team. I reassessed my work installing valve cover and found the gasket was not completely in place. I also double-checked my ignition coils and found that one was still faulty. Now she is running fine. Thank you very much and sorry to bother you. It was my neglect. I had a feeling that the gasket was not completely in place.
That is what I get for working in a parking lot in the dark.

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Wednesday, December 12th, 2018 AT 11:17 AM

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Nice work, we are here to help, please use 2CarPros anytime.

Cheers, Ken

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Wednesday, December 12th, 2018 AT 5:48 PM

PAULBENAVENT

MEMBER
5 POSTS

Hello again Ken and team,

I did come up with another question/issue please.
I am including a video to help show what I mean.
I cannot find any schematics showing what wiring system is just in front of the passenger seat in the motor compartment.
I checked connections with a testing light and one came up bright and another one very dim or even blinking.
My code reader still gives me a p0335 generic. Crankshaft position sensor "A" circuit
and manufacturer control.
If you could help me decipher what the wiring connection is in front of the passenger area by the motor that would be a great help.

Video (Click to make bigger)

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Thursday, December 13th, 2018 AT 8:15 AM

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Hi Paul,

Can you please take this question and start a new thread so the subject matter is not mixed please? Include the video.

Please post your new question here, you must be logged in.

https://www.2carpros.com/questions/new

Cheers, Ken