Car acts like it has a misfire under load

Tiny
CHIEFSMOKES
  • MEMBER
  • 2000 NISSAN MAXIMA
  • 3.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 175,000 MILES
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.
Do you
have the same problem?
Yes
No
Sunday, August 11th, 2019 AT 9:57 PM

4 Replies

Tiny
CARADIODOC
  • EXPERT
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
Was this
answer
helpful?
Yes
No
+1
Monday, August 12th, 2019 AT 12:26 PM
Tiny
CHIEFSMOKES
  • MEMBER
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.
Was this
answer
helpful?
Yes
No
Monday, August 12th, 2019 AT 12:56 PM
Tiny
CHIEFSMOKES
  • MEMBER
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.
Was this
answer
helpful?
Yes
No
Wednesday, August 14th, 2019 AT 4:36 PM
Tiny
KEN
  • ADMIN
Please do, CARADIODOC is one of our best.
Was this
answer
helpful?
Yes
No
Wednesday, August 14th, 2019 AT 4:47 PM

Please login or register to post a reply.

Recommended Guides