I’ve had my 2000 Honda Accord V6 for about 3 years now and have had an idling issue pretty much since I purchased it. After driving for at least 50+ miles, and if its hot out it can easily have this issue as well, and leaving the car be for around 15 to 30 minutes, on start up the car drops RPMs immediately and dies. Multiple tries and it will do the exact same thing.
Recently I found out a trick to make it work correctly which is revving the engine to 2000RPM for about 3-4 minutes, slowly dropping it down to 1500 RMP for around the same 3-4 minutes and finally down to 1000 RPM for an additional 3-4 minutes and letting off the gas. Usually after doing this the engine idles fine, car drives great.
However, it must be noted that on Summer days with temperatures in the 85+ range, if I’m climbing (going up a hill for a long distance) the car might bog down on me, will not go above 50MPH and I have to pull off the side of the road for 45+ minutes before the car will run correctly again. This has happened about 3 or 4 times in the 3 years I’ve owned the car.
I would rather not have to rev the engine in hopes this fixes the issue each time so I’m wondering what could be the cause in the first place? I’ve replaced so many things including spark plugs, ignition coils, battery, idle air control valve, gasket, fuel pump, fuel pump relay and on. I gas the car up with Chevron gasoline, I’ve dumped in I don’t know how many different fuel injector cleaners and have also tried Heet as well as Sea Foam cleaner. I’ve also had the car checked for vacuum leaks.
I’ve asked multiple mechanics if this could possibly be a vapor lock issue, but they all turn that idea down. They tell me that since the car is fuel injected this can’t be the issue…but, I don’t know, could it be the issue?
If anyone can give me some thoughts or suggestions I am open to them all. Thank you.