My 2001 Honda Civic w/ 122,000 miles w/ regular maintenance has a phantom issue. About four weeks ago I was on the freeway in normal conditions 60-70 MPH and I lost most of the throttle power to just 1500-2000 rpms at full peddle throttle with an uneven idle & a check engine light on – I pulled over turned it off and sat for 10 minutes. I tried starting it and it ran fine but the check engine light was still on. I had it towed, just in case, to my mechanic and he hooked it up to his machine to get the maintenance codes which yielded nothing so he cleared it, inspected the car and sent me on my way. Well it’s been four weeks and today it did the same thing as last time. I had it towed to my mechanic again and they inspected everything (fuel filter & pump was his best guess but it is fine w/ correct pressure) and still no codes on their machine. The check engine light is cleared and the car runs fine right now but I can’t trust it anymore for the commute. Has anybody had a similar situation before? Is there anything I should look out for or maybe tell my shop to look out for? Thank you for your time.

- Joseph

. Perform tests in the link below:

https://www.askmehelpdesk.com/cars-t...ml#post2123675

Focus on the Crankshaft Position Sensor.

. Check the Main PGM-FI Relay for cold solder joints on the PCB.

. Clean main ECM ground.

I am having the same problem with my car, its very annoying. Mine will do it mid-day. Drives fine at night. I will look into the above suggestions as well. I just can't afford something too crazy in repairs.

cdougdesign, the main relay may be failing, due to cold solder joints on the printed circuit board, during the heat of the day.