Like when the airpump is taken out, or just unpluged (electrically), why does the car run so much colder?

 

I've never heard of that before. My car runs just as hot withou t the AIR pump. Did you accidentally disconnect the connector for the coolant temperature sending unit for the dashboard?

 

http://www.geocities.com/MotorCity/6...3/egrpipes.htm

Also i have a friend thats got a prob with his air pump so he just took the resistor out of the box so it doesn't work, and his temp stays low also.

 

You said AIR, not the EGR. Deleting the EGR can lower underhood temperatures, yes.

AIR and EGR are two different things.

And the AIR pump only runs on cold startup and certain low-rpm/load conditions. Once the car warms up, there is no need for it. It will have nothing to do with coolant or engine temperature.

 

Thanks for the clear up. Friend kept saying it was the AIR, anyway...


So why does the EGR have so much of an effect on the temp?

 

I thought the EGR was supposed to lower combustion temperatures (besides from helping emmisions)... With less combustable-gasses in the cylinder, the combustion would would produce less heat. Am I missing something here? Unless it's the rerouting of the exhaust that causes the ambient temperature under the hood to rise??

 

Getting rid of the AIR pump would fail emissions tests correct? (in northern VA)

 

I dont' think so. Correct me if I'm wrong but all the AIR pump does is blow extra air (oxygen) into the cat for the first few seconds of a cold start. In essence all it does is help the cat "warm up" faster. If your car has been on for a little while, there should be no difference...

 

well, the AIR pump being removed would throw a SES light, would that code keep you from passing emissions?

Sould you just get it programmed out?

 

That page is in major error. The pipes shown in the pics are the AIR system pipes (1993 specific) and not the EGR. A mention of the EGR and a block-off plate are shown, but the author of that page has some confusion about what is what. Probably why so many other people are confused about the two systems as well.

There is no real reason anything to do with the AIR pump would have anything to do with engine temps. The pump is only on for a few minutes on cold startup and then goes off.

OTOH, EGR functions actually lower combustion temps, so I don't know where this "coolness" is coming from, other than the surface heat from those pipes, due to the check valve location.

 

The coolness is probably from when you remove the air or egr you can get a code. This will make your fans run all the time when the car is on, thus cooling the car down.

Taylor

 

When you unplug the air pump the fans stay on all the time.