Car acts like it has a misfire under load

2000 NISSAN MAXIMA
175,000 MILES • 3.0L • V6 • 2WD • AUTOMATIC
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CHIEFSMOKES
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  • 3 POSTS
Car acts like it has a misfire under load. 60 mph seems fine around town but once it is warm seems to get worse. So far I have replaced the following: fuel pump, filter, MAF. cleaned throttle body IACV.. Replaced plugs and coils, gas tank and fuel filler neck. I have a new code for temperature sensor and sender.. what else could I be missing? Every time I replace something runs good for a day or two and right back to jerking bucking under load.
Aug 11, 2019 at 2:57 PM
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CARADIODOC
  • ✓Experienced Mechanic
  • 34,403 POSTS
I would suggest to take a look at the injectors, you may have one that is failing.

Here are a couple guides t read that will help you figure it out:

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

https://www.2carpros.com/articles/how-to-replace-a-fuel-injector

https://www.2carpros.com/articles/how-to-use-a-voltmeter
Aug 12, 2019 at 5:26 AM
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CHIEFSMOKES
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  • 3 POSTS
I have both my coolant temperature sensor and sender now. When I replace them I will check the injectors. I would just think that if the injectors were bad I would get a misfire code or that it would misfire whether it was cold or warm..I wouldn't think it would run fine under 50. It doesn't seem like it starts to become a problem until I'm over 50 mph. then once it starts it just gets worse. At this point I'll try anything.
Aug 12, 2019 at 5:56 AM
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CHIEFSMOKES
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Well CARDIODOC ...not 100% sure but after throwing parts at my car for about two months I replaced the coolant temp switch and sender and my max idles well and after taking her on a pretty thorough test drive pushing her a little harder than I typically would, the coolant circuit may have been the problem. I don't want to get my hopes up because I hadn't checked the injectors yet. ( need to get some replacement o rings first) I did check all my vac lines and my intake though and no leaks. So hopefully this is a victory. Give everyone an update in a week.
Aug 14, 2019 at 9:36 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,554 POSTS
Please do, CARADIODOC is one of our best.
Aug 14, 2019 at 9:47 AM
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