2015 Infiniti QX50 stall when starting sometimes

Discussion of Infiniti's amazing (and underrated) sport-luxury crossovers, the EX35 and EX37. For 2014, the EX series will be renamed QX50, in line with Ininfiit's new naming conventions.
rjkoop
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Joined: Sun May 12, 2019 4:02 am
Car: 2015 Infiniti QX50 Journey

2015 Infiniti QX50 stall when starting sometimes

Postby rjkoop » Sun Nov 15, 2020 5:57 am

Have a 2015 Infiniti QX50 Journey with about 50,000kms.

Noticed that sometimes when I start the engine (especially when cold) the RPMs will come up like a normal start, and then drop to below idle and the car will stall. Pressing the button again it will then start fine and the RPMs will stay high like it should with a cold start and then come down to normal idle when it warms up a bit.

Anyone seen this before? Maybe I should clean the MAF sensor (I assume there is one... haven't checked), check for any loose hoses (maybe a small air leak?), clean the throttle body (looks like they may get dirty quickly on these cars), change the air filter, etc... Haven't done much with this car other than oil changes since I bought it at 38,000kms.

Richard


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PapaSmurf2k3
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Re: 2015 Infiniti QX50 stall when starting sometimes

Postby PapaSmurf2k3 » Sun Nov 15, 2020 10:07 pm

Yeah that sounds like either a lazy throttle/idle, or fuel pump. I'd start with the throttle body like you mentioned.
Are there any codes/check engine light?

rjkoop
Posts: 2
Joined: Sun May 12, 2019 4:02 am
Car: 2015 Infiniti QX50 Journey

Re: 2015 Infiniti QX50 stall when starting sometimes

Postby rjkoop » Mon Nov 16, 2020 4:41 am

Nope. No check engine lights. Mileage seems fine and no other issues.

Did the easiest thing 1st. Cleaned the MAF sensor.

Richard

sev
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Re: 2015 Infiniti QX50 stall when starting sometimes

Postby sev » Thu Nov 19, 2020 12:04 am

This is a tell-tale sign your throttle actuators are dirty and need cleaning and recalibration. There's a bunch of youtube videos on how to do it, should be about an hour tops to do if you take your time. Let us know if it worked!


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