Performance Diagnosis, No Codes
What if you don’t have any codes stored and you still have a performance issue with your vehicle? This is where things can get a bit tricky. One of the first things I do is try to nail down the system where the problem is originating. It could be an engine or transmission problem, or something else, such as an issue with the final drive. It could also be a problem with the brakes, the tires, the engine mounts, or any number of things. One of the first things you can do is determine if it’s an engine problem or an automatic transmission problem. If you have a manual transmission, this test won’t work for you.
Video Title: Performance Diagnosis, No Codes – Solving Automotive Performance Issues – EricTheCarGuy Video Description: In this Article, Performance Diagnosis, No Codes, we look at how this can impact Engine Performance. Thumbnail: http://www.ericthecarguy.com/images/faq_buttons/Large_FAQ_Images/Performance-and-Driveability-icon-1200.jpg
5 thoughts on “Performance Diagnosis, No Codes”
Danny
November 16, 2025 at 7:37 pm
Hello i have a 03 honda accord its a j30a manual 6 speed and ive been having problems with it starting and staying alive ill recently had a new alternator i had a new ecu put in ive replaced all the little things you could do like sparks, ignition coils, battery etc, im thinking it might be a crank issue because i did recently change my crank sensor due to it throwing codes im also thinking it might be the starter but again im not sure so any in sight on what my problem might be would be greatly appreciated
Please and thank you.
EricTheCarGuy 1
November 17, 2025 at 6:50 am
If you’re going to throw parts at it, perhaps watch this video first. https://www.youtube.com/watch?v=WX9EF0eOrVs&t=39s
You might also find this information helpful. https://www.ericthecarguy.com/solving-automotive-no-start-problems/
Good hunting.
Danny
November 18, 2025 at 3:59 am
That video is what i watched to get here so i know that isnt the problem i did think it was a key problem at first but i honestly dont think its the issue cause this afternoon i turnt it on and it went but it sounded really rough there was alot of smoke in my valve covers and my oil felt wet somehow im not sure what it is that could be the cause of this but it sure is annoying i wouldve done more digging but i had places to be and things to do so thats all i did to the car today
EricTheCarGuy 1
November 20, 2025 at 6:54 am
Follow the evidence and not your gut. More info here. https://www.ericthecarguy.com/solving-automotive-performance-issues/
Bruce R Power
June 8, 2021 at 9:18 pm
Hi Eric, i have a 96 chevy c2500 pickup with a 5.7 vortec. Its got 303,000 miles. Just went through motor replacing all gaskets, new spider injectors, everything was new when pur back together. Im having and issue when i drive it between 2,000-3,000rpm it sputters real bad. When i jam the pedal to the floor its got a loss of power slightly but clears up and goes. NO check engine light/ no pending codes. Im lost. Im gettin ready to cut the cats off and hollow them out. There original from 96. Hearing a slight noise from them. Any insight will be much appreciated man. I watch ur videos all the time and actually just subscribed to your channel. Your very good and i like how you do your work. Thanks man.