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O2 sensor

Tiny
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Okay, something was missed somewhere.

Let me review.

Roy
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Sunday, November 10th, 2019 AT 5:12 PM
Tiny
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Thank you for your quick and accurate responses.
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Sunday, November 10th, 2019 AT 5:22 PM
Tiny
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You are welcome.

Always glad to help.

Roy
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Sunday, November 10th, 2019 AT 5:29 PM
Tiny
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Do you think bad ground could cause this situation?
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Monday, November 11th, 2019 AT 3:17 AM
Tiny
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No I am going in the direction of mechanical.
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Monday, November 11th, 2019 AT 3:23 AM
Tiny
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I'm searching every where in last year I can tell I have read almost every forum and topic about sluggish or poor or slow acceleration. But I can't figure it out if it's timing. So why there isn't any rough idle or misfire or engine noise?

If it's fuel pump why fuel trims are about 0 and why it's intermittent like something regain and lose?
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Monday, November 11th, 2019 AT 3:46 AM
Tiny
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It is my spark plugs.
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Monday, November 11th, 2019 AT 4:02 AM
Tiny
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Timing does not necessarily end with rough running especially if it is off maybe 1 tooth.

Fuel pressure will be seen on long term trims.

Did you check compression?

Roy
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Monday, November 11th, 2019 AT 4:06 AM
Tiny
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Did you respond? I got an email but nothing came up on my message board.

Roy
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Monday, November 11th, 2019 AT 4:14 AM
Tiny
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No I just read your respond now.
I didn't check compression. Do you think it could be problem?
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Monday, November 11th, 2019 AT 4:32 AM
Tiny
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It needs to be checked.

Roy
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Monday, November 11th, 2019 AT 4:54 AM
Tiny
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But before that can you help me to check timing mark by myself? Because I don't trust the mechanics out there.
Do I need to rotate engine?
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Monday, November 11th, 2019 AT 5:29 AM
Tiny
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Once the cover is removed. Hand rotate the motor until number 1 is lined up on the crank pulley as in the photo I attached.

Then look at the cam gears that I attached as well. They need to be exact.

Roy
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Monday, November 11th, 2019 AT 5:36 AM
Tiny
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Do I have to remove crank pulley to rotate engine? Or I will hand rotate crank pulley?
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Monday, November 11th, 2019 AT 5:55 AM
Tiny
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You can hand crank the engine with the pulley attached.

Roy
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Monday, November 11th, 2019 AT 5:57 AM
Tiny
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Thanks. If you find anything else please tell me to check that. Thank again
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Monday, November 11th, 2019 AT 6:13 AM
Tiny
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You are welcome.

Roy
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Monday, November 11th, 2019 AT 6:21 AM
Tiny
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Do the problem isn't timing either. Don't you think an intermittent problem like this could be a sensor related?
Because I think mechanical one couldn't be intermittent and when something mechanical damaged it's not working correctly until repair it. Could a fuel pump get weak intermittently or a fuel filter get clogged partially? I don't know any more.
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Tuesday, November 12th, 2019 AT 5:17 AM
Tiny
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Not a sensor at all. It would code when out of its parameter.

Yes to a fuel pump but you would need to monitor the pressure while driving and when the issue happens.

Roy
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Tuesday, November 12th, 2019 AT 5:22 AM
Tiny
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Okay, I have a spare fuel pump and change it soon. But the question that remain is if it's fuel related why fuel trims are about 0?
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Tuesday, November 12th, 2019 AT 5:27 AM

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