2005 Nissan Sentra 2.5l. Owned it since day one...Doubt a "cleaner" will help you. It would be useful if you stated what vehicle you have. I certainly would start with a basic diagnosis including code scanning, fuel pressure check and overall ingnition system condition.
Replace the spark plugs. Clean MAF sensor if it has one. Just live with it.New fuel pump, bank 1 sensor 1, evap solenoid, coils
etanol can be blamed in some cases. (mostly in winter)Looking for the best cleaner to help with a weird cold rough idle. Other than that, car runs fine
I did not change that module out... I changed it the complete pump assy. I drive 45 mins a day to work with it. It's my commuter, I'm trying to keep it as long as possible. Lol. I have a new 6.7 diesel on the weekend.The P1237 code specifies the Fuel Pump Control Module specifically. You never mentioned it.
Was a new FPCM included in the new pump assembly?
If every part is OK try taking the car for a nice, long 4 hour drives. You'd be surprised how much that can help.
Is there a fuel filter (aka the most overlooked filter)?
How many miles on your '05?
Overdose her on Chevron Techron Concentrate (use ~1.5 ounces per gallon of fuel) before a stint of LOCAL DRIVING.
They say the PEA dissolves crud on the injector nozzles upon shut-down.
aka, catalyst cleanerI’ve read about large doses of acetone and hard driving making CEL go out.
I'd put some gumout regane through it with a tank of 93 octane like you did. Inspect oil after the tank as well.Let me ask you guys this...
Put a tank of 93 in it, the CEL has been out for two days and idles smoother.
And the kicker is that it passed emissions just now.
Does that sound like it needs a combustion chamber cleaner or something? Carbon'd up inside the engine maybe?
Edited: the last few days I kept it at 2500 rpm/65 mph. I left the emissions and drove it at 2950rpm/75 mph and the light came back on. So it's rpm related I'm thinking...
Myth. Repairing the cause makes the CEL go out.I’ve read about large doses of acetone and hard driving making CEL go out.