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post #11 of 17 Old 02-28-2019, 12:42 AM Thread Starter
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Thanks for the reply Alan,

That's an idea, but is currently lower on the list. My fuel trims look good, and it's intermittent when it happens, and it doesn't happen everyday.

Did some more research tonight, and here are my 3 leading theories.
1) Alternator - I'm going to hook up my scan too to see if I can catch it in "the act". if my voltage doesn't drop, then that would rule out my alternator.

2) Fuel Pump - That it's dying and some days are better than others. It can't provide enough fuel when it acts up, and the car cuts-out for a split second.

3) Transmission - The transmission could be slipping, as I have never experienced a slipping automatic transmission I have no experience to go by. But as of now, the color of the fluid looks good, so i'm not sure.

The big pain in the butt is that 20% of my commute is over bridges and interchanges with no real places to pull a car over. It worries me.

Please keep the Advice coming!
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post #12 of 17 Old 02-28-2019, 01:20 AM
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Quote:
Originally Posted by scarecrowdjinn View Post
Thanks for the reply Alan,

That's an idea, but is currently lower on the list. My fuel trims look good, and it's intermittent when it happens, and it doesn't happen everyday.

Did some more research tonight, and here are my 3 leading theories.
1) Alternator - I'm going to hook up my scan too to see if I can catch it in "the act". if my voltage doesn't drop, then that would rule out my alternator.

2) Fuel Pump - That it's dying and some days are better than others. It can't provide enough fuel when it acts up, and the car cuts-out for a split second.

3) Transmission - The transmission could be slipping, as I have never experienced a slipping automatic transmission I have no experience to go by. But as of now, the color of the fluid looks good, so i'm not sure.

The big pain in the butt is that 20% of my commute is over bridges and interchanges with no real places to pull a car over. It worries me.

Please keep the Advice coming!

3) Transmission could be slipping but does your issue happen when shifting?
because if it happens at 70 mph at the highest gear... I don't think it's the case....

As for today I'd go with the fuel pump, alternator might also have a say in it.

Versa 2012 HB S
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post #13 of 17 Old 02-28-2019, 05:00 PM Thread Starter
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I haven't experienced the issue on the highway yet. And it never gives me any trouble the very first moments forward from a dead-stop.

I have tomorrow off of work, so i'm going to drive my car like I stole it and see if I can get it to act up.
Then i'm going to try and pull some limited data streams and see if they can point me in the right direction.
Here are the data streams i'm going to try and grab if I can recreate the issue consistantly
Engine temp
Short term trim
MAF data
Voltage


If I still have no luck after that, I may pull the fuel pump this weekend and inspect it for debris or foreign objects in the gas tank.
... and after that, I may throw a cheap fuel pump at it, or the pressure regulator.

Questions,
A failing coil pack should eventually throw a check engine light correct?
Is there any other budget "tests" people can suggest, other then trying to splice in a pressure gage?
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post #14 of 17 Old 02-28-2019, 05:04 PM
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You can at least get an idea of a vacuum leak with the old wd40 test.
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post #15 of 17 Old 03-01-2019, 12:03 AM
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Virtually ALL codes can happen without a light if the incidence of the happening is short enough to allow for it. The software is written to ignore them up to various times and seriousness as outlined in the software. If not, every car on the planet would have warranty issues instantly as a car cannot go even one day without some sort of an erratic blip in operation simply due to the chaosian design of the systems. No sensor on earth has absolutely 100% perfect out put at all times. All sensors added together and you can have 3-4 errors every day, just not recorded as such, they are 'normal'.

Why more happenings are recorded in history and as pending codes that do not light the light, the ECM has noticed them but takes a time to decide if they are real or not based on the severity of them and the number of times, again, all provided for in the software.
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post #16 of 17 Old 03-01-2019, 12:07 AM
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' You can at least get an idea of a vacuum leak with the old wd40 test.'

Not if the leak is 100% hidden. Say IAC passage internal leak under the TB from reusing a base gasket, the main intake can crossleak into any IAC bypass molded into the TB. Depends on the TB design of course. I've found that in Fords before.
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post #17 of 17 Old 03-01-2019, 12:08 AM
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If you have a tach then a slipping trans or clutch becomes obvious instantly, the rpm goes up with the degree of slip.
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