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Old 12-31-2012, 11:37 AM   #1
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Q45t bucking in first minute or so after startup

My engine misfires and bucks in a warm-start or re-start situation (been driving for a while, stopped the car for less than 3 hours, restart)

and it would buck harshly at very light throttle input and at very low RPM.

Is it a common thing that happened to other Infiniti models?

Tried changing the fuel filter and sparkplugs it made no difference. It happens under a set condition which leads me to believe it's an engine management issue.

Any input would be appreciated.
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Old 12-31-2012, 12:58 PM   #2
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vacuum leak?
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Old 12-31-2012, 02:44 PM   #3
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Don't think so because symptom goes away shortly after a minute.
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Old 12-31-2012, 03:33 PM   #4
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TPS?
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Old 01-02-2013, 10:05 AM   #5
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Very similar thing happened on 6th gen accords, my old one too.

After a warm start (restart car after 10~20 minutes of rest), car would crank, turn on, and immediately shut off. Or there would be very rough idle for a few seconds, then turn off. I could feather the throttle to keep the engine going, but then it would throw an all cylinders misfired code, and would sometimes backfire. I could repeat this process a few times until it idles right, or leave it for about 45 minutes, and all would be fine.

There were a variety of fixes, but the main problem with it was that there was some form of condensation in the fuel lines, and it wouldn't ignite properly.

Some fixes for the accord were: replace main relay (defective product, solder joint would loosen with age); replace crankshaft position sensor; Some have said ignition switch; dirty idle air control valve...and eventually the ECU.

This was on the accords, but some of it may help you!
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Old 01-02-2013, 12:50 PM   #6
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hmmm interesting because the Crank Shaft Position sensor is throwing a code right now for "erratic signal" because the manual flywheel has 2 teeth less than the automatic flex plate, hence the CPS is reading signal with all sorts of wrong.

I will unplug that and see if that's the cause for the symptom, otherwise I'm going to have to somehow remove the ring gear from the automatic flex plate and transfer that to my flywheel.

And then the TPS is just generally really hard to get to... I will try to adjust it anyway see if anything changes. Looks like there are signs of tempering.
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Old 01-13-2013, 10:00 PM   #7
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did this start happening after you did the manual swap, i am leaning towards a MAF issue or an o2 sensor issue or vacuum leak
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Old 01-14-2013, 01:37 AM   #8
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I had the same problem with my subaru. I did some research and bought some electronic contact cleaner from main street electronics. Main Electronics MG Chemicals page Its the second one on the list. They are local. It cost less then $10 dollars. It fixed the problem. The sensor just got dirty and I cleaned it with that product. You can probably find something else in canadian tire which is made for MAF sensor cleaning. Heres a video
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