I have two issues on my 2005 Honda Accord (2.4L 4cyl engine) that may be related:
- Sometimes the engine will not start.
- The engine turns over a few times but eventually stops and then fast clicks.
- Trying again sometimes will start the engine, other times will not.
- Battery "boost" equipment I have doesn't seem to make a difference.
- Jump-starting from another car almost always works, but I have to leave them connected for a few minutes.
- In park, if I step on the throttle the engine will not go past 5000RPM.
- The engine RPM will start to pulse around 4800RPM
- The harder I step on the throttle pedal the faster it will pulse
- Battery voltage remains solid at 14.6V above 1500RPM
I have so far:
- Replaced the battery with a brand new battery
- The old battery was 6.5 years old so probably needed replacing!
- No battery light indicator on dash when engine is on
- I still sometimes have to jump start from another car even after getting a new battery (see above)
- Verified the alternator is charging the battery
- 12.6V when engine is off
- 11.1V during cranking
- 14.2V when engine is on
- Ground/connectivity paths between alternator and battery seem to be OK
- Connected an OBD2 scanner
- No DTCs
- RPM, temp, etc. on scanner appears to match what is indicated on the dash
- Battery voltage on scanner appears to match what is indicated on multimeter
- Tested the new battery with a battery tester
- Tester says battery is OK
- Tester says car charging system is OK
- I've been reading about the ignition system in the Honda 2.4L 4cyl system:
- The ignition relay could be bad, but it's not clear to me how to diagnose this other than replace it and see if the problem goes away
- The alternator could be bad, but it's not clear to me how that would explain the 5000RPM problem
I could be dealing with separate issues. I would really appreciate advice from the community on what to try as next steps. Thank you!
Thank you @Paulster2. I inspected the positive terminal battery connection and it was very corroded. I disassembled the battery connector and thoroughly cleaned it with baking soda and water. The car turns over consistently now, although still a bit sluggishly, but at least it turns over every time.
I may still be dealing with a dying starter. Is there a way to test if the starter is failing?