Hesitation

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Gn22
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Hesitation

Postby Gn22 » Wed May 03, 2023 8:48 am

2008 Nissan Pathfinder V6 130000 mil A few times I'm on express way around 60 MPH I have some hesitation (hiccup)
cam/crank position sensors have been changed with Hitachi not long ago, spark plugs changed no check engine light. any help please
thanks


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VStar650CL
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Re: Hesitation

Postby VStar650CL » Wed May 03, 2023 11:42 am

Have you cleaned the MAF and performed an IAVL? If not, that's the first thing to try.

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find_your_path_r51
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Re: Hesitation

Postby find_your_path_r51 » Wed May 03, 2023 12:18 pm

MAF would be my first part to check, cleaning might not be enough.

Do yourself a favour and get the original OEM Nissan Sensors. Even if the sensors of known brands do fit, they might sit in an complete plastic housing instead of just a half plastic one. So it happend to be with a Hella Crankshaft sensor (if I remeber correctly) in a 4l Petrol Pathy.

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VStar650CL
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Re: Hesitation

Postby VStar650CL » Wed May 03, 2023 12:49 pm

find_your_path_r51 wrote:
Wed May 03, 2023 12:18 pm
MAF would be my first part to check, cleaning might not be enough.

Do yourself a favour and get the original OEM Nissan Sensors. Even if the sensors of known brands do fit, they might sit in an complete plastic housing instead of just a half plastic one. So it happend to be with a Hella Crankshaft sensor (if I remeber correctly) in a 4l Petrol Pathy.
My customers haven't actually had many bad experiences with aftermarket MAF's, provided they're properly calibrated (that's what IAVL does). What people don't get about Nissan MAF's is that the ECM extrapolates the idle values across the whole range of readings, so just throwing a new one in without calibration is almost guaranteed to cost you power, gas mileage, or both. Aftermarket CKP's and CMP's are a different story, I can't tell you how much hair-pulling and head-scratching I've seen over the years from aftermarket units that didn't work right. You're absolutely right about those, stick to OE and skip the heartache.

Gn22
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Re: Hesitation

Postby Gn22 » Wed May 03, 2023 1:09 pm

I did the IAVL but not the Maf sensor. I will clean the MAF sensor and will do a IAVL again. Thanks

Gn22
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Re: Hesitation

Postby Gn22 » Wed May 10, 2023 9:24 am

Hi, I replaced the Maf sensor with Hitachi , but still doing it
thanks

mdmellott
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Re: Hesitation

Postby mdmellott » Fri May 12, 2023 9:30 pm

No check engine light but always some hesitation at higher speeds could be a fuel delivery issue when demand is higher. Low fuel pressure from the pump or a faulty fuel pressure regulator, sending too much fuel back to the tank, would give your ride symptoms like a hiccup that feels like a misfire or hesitation that just does not respond to expected acceleration when driving at highway speeds. I would get the fuel system pressure tested to verify proper function of the fuel pump pressure and the fuel pressure regulator.

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AS_The_Crow_Flys
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Re: Hesitation

Postby AS_The_Crow_Flys » Fri May 12, 2023 9:42 pm

check for loose grounds and make sure the battery connections are firm and clean.

may not be the cause but it also could be.

Gn22
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Re: Hesitation

Postby Gn22 » Wed May 24, 2023 4:00 pm

Well Ignition Coil #2 was the problem, so everything looks good so far
thank you all.

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palmerwmd
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Re: Hesitation

Postby palmerwmd » Mon May 29, 2023 5:15 pm

Gn22 wrote:
Wed May 24, 2023 4:00 pm
Well Ignition Coil #2 was the problem, so everything looks good so far
thank you all.
Glad it worked out for you in the end! :)


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