EGR Valve & Hot Engine - Team Camaro Tech
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post #1 of 6 (permalink) Old Oct 30th, 02, 02:54 AM Thread Starter
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the previous owner of my car removed the egr valve for some unknown reason to me, and blocked the hole with a plate, now my question is, will not having an egr valve cause my engine to run hot? when my car runs at an idle for a while it gets really hot, im not sure if it will over heat or not but it runs above 220, i flushed the system a while back and put in a new thermostat (195 deg.) and a new Cap (15lbs) its a 305 engine carbureted non-computer controlled 1984 Camaro. any suggestions?

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post #2 of 6 (permalink) Old Oct 30th, 02, 07:54 AM
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A blocked or missing EGR valve will not make your car get hot at idle. Actually, the EGR valve only works when the car is off idle and warm. It's job is (was!) to squirt a little exhaust gas into the incoming air to lower combustion efficiency (and therefore temperature) slightly. It sounds like a dumb thing to do but the effect is that less of the nitrogen in the air gets reacted during combustion, and then you create less NOx pollution.

In high performance applications, the EGR valve is generally removed to improve power.

Your problem is more likely that the electric cooling fan doesn't turn on in that car until 225 degrees. This is the way they came from the factory, and there's really nothing wrong with that. You can control the fan with a generally available thermostatic switch if you want to change the set points.

By the way, what's a non-computer '84 Camaro?? Even the carbureted models had computers. Did somebody remove yours??
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post #3 of 6 (permalink) Old Oct 30th, 02, 10:39 AM
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check the plug on the temp sensor located on the passenger side head, this sensor controlls the fans to come on at 218-220 degrees, alot of times they burn off, Timing can cause overheats, as well as the ECM having problems, like mis reading data from a Map or O2 Sensor, the ECM will keep the car rich, the 84 most likely had the QuadraJet with the computer controls and Vacuume lines all over the place, but I believe it was still metered by the ECM,

I had a nightmare problem with mine too

see
https://www.camaros.net/forum/Forum5/HTML/002338.html

this might help.

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[This message has been edited by Chris Edwards (edited 10-30-2002).]
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post #4 of 6 (permalink) Old Oct 30th, 02, 01:34 PM Thread Starter
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i dont have an electric fan in my car.
so im not sure what the problem is now, since the weather is cold now i dont have the hot engine problem, but during the summer before i replaced the radiator cap and installed a thrmostat i had the prob. so im hoping i fixed it, i just happpend to read something about the egr in the chilton manul about it causing the engine to get hot.

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1984 Chevy Camaro (305)
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post #5 of 6 (permalink) Old Oct 30th, 02, 06:44 PM
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The '84 305 had a clutch fan if I remember correctly. If it heats up at idle and city driving and runs cool at highway speeds the fan clutch is probably shot. Buy a new one and replace it. Pretty simple job. Napa lists them from $35 to $99. Just make sure you get the right one.

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post #6 of 6 (permalink) Old Oct 31st, 02, 02:00 PM Thread Starter
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i wouldve never thought about that, thanks alot, i will check it out this weekend. sounds like that could very well be it. since i tried everything else already. thats why i come to you guys

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