Help! car running rough and stalling.

[lazlong]

Originally Posted by suds1485

so on sat i cleaned my throttle body and iac also changed the air ilte and spark plugs, and it still doing it. i really dont get it.

Did you reset ECM or just idle re-learn?

[suds1485]

I disconnected the battery for like ten min than did the relearn so I'm assuming I reset the computer.

[lazlong]

Originally Posted by suds1485

I disconnected the battery for like ten min than did the relearn so I'm assuming I reset the computer.

Re-learn doesn't reset the ECM/PCM. Here it is again if you missed it:

OK, forget everything I've said. After poring over the service manual I was reminded of Adaptive Fuel Trim (AFT for sake of argument). Anything with O2 sensors (HO2S) has AFT. Basically there's this thing called stoichiometric ratio which is the optimum emissions ratio. The exhaust gases switch back and forth: rich-lean-rich-lean (based on the stoichiometric ratio). The HO2S reads the oxygen content in these gases and sends a signal to the ECM/PCM. The ECM/PCM then adjusts the injectors to either run lean or rich.

When you did all the work to it, it changed the stoichiometric ratio. Your old stoichiometric ratio is still in the ECM/PCM memory. Reset the ECM/PCM:

1. Start the car and warm it to operating temp without load
2. Turn ign to OFF
3. Remove under-hood fuse #6 (ECM) for 10 seconds then re-insert
4. Start the car and let idle without load for 10 minutes
5. Turn ign OFF
6. Turn car on and go for a drive

Your idle should now be set but, it may take awhile before the ECM/PCM gathers enough fuel trim memory and resets readiness codes for you to start seeing better fuel mileage. If this doesn't set your idle find someone with a 2-way diagnostic tool and have them reset the ECM/PCM with the tool, then pull the ECM fuse (#6) for 10 seconds, then do the idle re-learn. If that doesn't work you can take it to Honda and have them put the latest update in the ECM/PCM.And if that doesn't do it then you might have an O2 sensor going bad.

[suds1485]

so i did what lazlong said to do with pulling #6 fuse. so far ive done done the timing belt, idler pulley, water pump, oil pump, valve cover gasket, valve adjustment, and cleaned the throttle body and iac. maybe when it cools down it will work properly.

[suds1485]

so i drove to work this morning with little to no issue. i think the car might have hesitated twice but it might have been in my head. when i left work i let it warm up and it seemed to run a lil rough for like a min but no where near where it was. so i think it just needs to relearn the proper stoichiometric ratio. in the mean time i think i might have fived the problem. i just wanna thank everybody for their input.

[It Wasn't Me]

Good luck with it. Hopefully it all works out well. Keep those fingers crossed!

[suds1485]

ok so the car is not fixed. it starts fine and runs good but when its warming up it starts to idle low if im driving it will hesitate if i stop and it starts i cant even pull away i have to shut the car off and start it up and it usually stops. but when its warm its fine its only when its warming i aslo dont get a check engine light.

[Tico Loco]

It´s strange! It do not look like a ignition problem. If you are not getting any code, the sensor should be OKay. Try a fuel pressure test while driving the car to see if the pressure drops, you may rent a Hand Fuel pressure gauge to do it, or buy one I am sure it´s cheap.

A intermittent failure is hard to find!

When the engine is cold the fuel mixture is extra rich and the ecu works in what is called close loop. ( some sensors do not work until the engines reach normal temp, like oxy sensor ).

[suds1485]

i fixed the problem! it was the god damn upstream o2 sensor

[JdmOdz]

Originally Posted by suds1485

i fixed the problem! it was the god damn upstream o2 sensor

upsteam o2! i was about to say check ur TDC sendor /Cam sensor. That can most deff cause the car to act abnormal. especially with your miles current miles