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#1
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Can an EGR valve not working properly cause this problem?
A problem with some person from Dallas Texas says he can be driving along for several miles and all of a sudden his water temp goes way up, the air conditioner stops working. The temperature comes back down and the air conditioner starts working again. This would seesaw back and forth a few times, but at other times it doesn't happen at all. Not a coolant leak and fans are working properly.
My car has been running real bad with the check engine light coming on after sometimes a mile, and at other times maybe 25 miles before the check engine light would come on. It seems to come on quicker when I am not pushing the car a little too hard. Translation... (When my wife is riding with me. ) Yesterday on a 90 degree day up and down hills about 65-70+ mph my car started the temp rise a ways and then after a few minutes, not many, the temperature would drop back down to normal… each time this happened, the air conditioner fan kept blowing air, but the cooling stopped. Higher rpm in a lower gear would bring temp down and the air conditioning cooling automatically would just happen. Did it about 3-4 times the same way. The EGR valve re-circulates exhaust gases into the throttle body to decrease combustion temperature and thereby reduce NOx and improve fuel consumption My question is... Can a defective EGR valve cause combustion temperature to increase enough while not preventing the NOx, which could also cause excessive temperature, result in rough running and at times a rise in coolant temperature? Getting up to normal temperature is pretty much a prerequisite for the rough running and check engine light to occur... on our SVX. We need a break on this rough running, ck engine light, and up-down coolant temperature problem. All input appreciated… Keith... always Last edited by kwren; 08-18-2008 at 01:39 AM. |
#2
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Re: Can an EGR valve not working properly cause this problem?
Sounds to me like you have a stuck thermostat. One that opens just enough when the car gets really hot and then the whole process repeats.
__________________
-Jason (8/23/07-Present) 1995 Subaru SVX LSi (197k) Polo Green (#1102) 03/95 Mods: DDM Tuning 4500k 35w Low Beam HID, 100w H3 Bulbs, Extra Ground Cables, 15 minute $12.96 mod, svxfiles designed transmission mount (), sporting a "new" tail light bar, silver BBS rims, custom power steering cooler (one that doesn't dump ATF constantly), new negative lead cable, no more third or fourth gear (1977-Present) 1977 Chevrolet Corvette (81k) Silver (12/01/2011-Present) 2005 Subaru Outback 2.5i Limited 5MT (97k) I have a bad feeling about this. -Obi Wan Kenobi |
#3
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Re: Can an EGR valve not working properly cause this problem?
Not even close
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#4
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Re: Can an EGR valve not working properly cause this problem?
You said the CEL is on. Did you pull the codes or no?
From what I can tell about the EGR system, it plays a relatively small part in the overall scheme of the engine. Definitely not enough to make the engine run rough AND make for a rise in engine temperature. This is why I figured you might have a somewhat stuck thermostat.
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-Jason (8/23/07-Present) 1995 Subaru SVX LSi (197k) Polo Green (#1102) 03/95 Mods: DDM Tuning 4500k 35w Low Beam HID, 100w H3 Bulbs, Extra Ground Cables, 15 minute $12.96 mod, svxfiles designed transmission mount (), sporting a "new" tail light bar, silver BBS rims, custom power steering cooler (one that doesn't dump ATF constantly), new negative lead cable, no more third or fourth gear (1977-Present) 1977 Chevrolet Corvette (81k) Silver (12/01/2011-Present) 2005 Subaru Outback 2.5i Limited 5MT (97k) I have a bad feeling about this. -Obi Wan Kenobi |
#5
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Re: Can an EGR valve not working properly cause this problem?
Could the water pump cause it? Like if the pulley was seizing up or something?
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1992 Subaru SVX 5spd 1998 Pontiac Firebird Formula 1999 Chevrolet Camaro SS 2009 Subaru Forester - Mileage Junky 2009 Pontiac G8 GT 2017 Ford Mustang GT 6spd |
#6
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Re: Can an EGR valve not working properly cause this problem?
Kwren... in short, no. My SVX runs no EGR at all and never exceeds temp. The EGR is not to cool the engine but it is more or less an emissions standard. The only thing that the EGR can do to make the engine run poorly is stick open, when this happens it fouls the charge at low RPM and at idle.
Tom |
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