Rpm question

[imthehink]

I had smelled smoke through the vents so I opened the hood and seen it was coming from the back of the engine by the drivers side. So I rev the engine up a bit to see If I can make out where it is coming from, but no luck. When it hits 3k and I let of the throttle, it dies. It will start back up with no problem though. Any thoughts? I'm stumped

 

[finch13]

My guess is the MAP sensor, I think we had a question like this last week. If the MAP sensor doesn't sense the vacuum after the throttle butterfly closes, the car will die.

Have a Haynes manual? There may be a testing procedure in their using a multimeter and probing the sensor contacts.

 

[HondaLuver83]

what finch said but since ur getting smoke, maybe check to see if anything is clogged??

egr? u have a system that recirculates exhaust gases from ur crankcase. Just to give u an idea.

 

[finch13]

The engine will still run if the EGR passageway is plugged, it will just stumble it's way up the tachometer.

Clogged passageways is something to be checked as well. You can take off the intake tube and disconnect the two breather tubes on the valve cover and see if the stumbling goes away?

 

[imthehink]

Alright, thanks guys. I'll try that.

 

[blacknight]

Is your CEL on?

 

[imthehink]

No

 

[1998accordsirt]

what finch said but since ur getting smoke, maybe check to see if anything is clogged??

egr? u have a system that recirculates exhaust gases from ur crankcase. Just to give u an idea.

You're thinking of PCV, not EGR.

 

[1998accordsirt]

The engine will still run if the EGR passageway is plugged, it will just stumble it's way up the tachometer.

Clogged passageways is something to be checked as well. You can take off the intake tube and disconnect the two breather tubes on the valve cover and see if the stumbling goes away?

If an EGR were plugged the only thing you would notice would be a loss of fuel economy. The whole purpose of EGR is to introduce inert gas back into the combustion chamber, effectively making it smaller. This allows for less fuel to be needed and it also cools combustion temps. If EGR were never developed most modern cars would never be able to get away with the high compression that they have. The cylinders would become too hot and detonation would occur.

Also, the EGR valve is only open at cruising speed/part throttle (never at idle because the engine would stall and never at WOT becasue we want the best A/F ratio available at that moment). So it would not stumble at idle since the PCM (or ECM as Honda calls it) looks at the VSS (vehicle speed sensor) and sees that the car is not moving/ in park or neutral.

Hope this helps...

 

[HondaLuver83]

If an EGR were plugged the only thing you would notice would be a loss of fuel economy. The whole purpose of EGR is to introduce inert gas back into the combustion chamber, effectively making it smaller. This allows for less fuel to be needed and it also cools combustion temps. If EGR were never developed most modern cars would never be able to get away with the high compression that they have. The cylinders would become too hot and detonation would occur.

Also, the EGR valve is only open at cruising speed/part throttle (never at idle because the engine would stall and never at WOT becasue we want the best A/F ratio available at that moment). So it would not stumble at idle since the PCM (or ECM as Honda calls it) looks at the VSS (vehicle speed sensor) and sees that the car is not moving/ in park or neutral.

Hope this helps...

I was thinking of both the EGR and PCV. Some accords in asia do not have an EGR valve. Are you sure this is how they work? Then how does it work when the car is not made with them?