Field Service Mode
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From: Louisiana
Field Service Mode
I have the tech manuals for my 95' Vette and I'm trying to troubleshoot an EGR problem. One of the steps call for a Tech 1 device which I don't have (probably have to get one off ebay), and using it to select "Field Service Mode". I need to put it in Field Service Mode but it only shows how to do it with a 12 pin connector using a paper clip, but I only have a 16 pin connector. Pin 6 is the "field service mode" pin while pin 4 & 5 are grounds. Would grounding pin 6 to either ground put my car in field service mode and would I have to do this with the engine running? How would I do this? I looked up "field service mode" in the archives, but didn't see anything on how to do this with a 16-pin connector.
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From: Louisiana
Never mind, I just jumpered pins 5 & 6 and I was able to diagnose my problem. Bad EGR. Took me three years to figure out my overheating problem, after two dealers and hundreds of dollars! Apparently, a bad EGR valve can cause overheating and bad emissions, according to the GM tech manuals (the ones the dealers use, but don't use, obviously!)
Last edited by albertlsmith; Jul 1, 2007 at 04:48 AM.
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From: Louisiana
Still having overheating issues
Ok, I posted a while back that I thought that I had finally found the problem with my 95' overheating problem due to a bad EGR. I've taken the car for 2 or 3 test runs since and I'm still having overheating problems. The first time, I forgot to check the coolant level and found it was missing a gallon or so of coolant. The second time I forgot to bleed the valve. This time, I made sure the cooling system was full and bleeded, even ran the car a little so I could wait for it to cool down and add more water if needed, to make sure the engine had enough water, not just the radiator. It has been 3 years so it's starting to come back to me now. If the head gasket is leaking or there's a crack in the block or heads, is there a way to tell, without having to take my engine apart or pay thousands of dollars to have someone else do it. The GM shop manuals just list it as a possibility and just says "replace" without any diagnostic steps. Thanks for you help.
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From: Louisiana
The cap is (was) new when this problem first came up 3 years ago as one of the things that got changed, along with the water pump and thermostat. I haven't pressured checked it yet, but that is my next step.
Melting Slicks
Joined: Feb 1999
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From: sonoma ca
I have the tech manuals for my 95' Vette and I'm trying to troubleshoot an EGR problem. One of the steps call for a Tech 1 device which I don't have (probably have to get one off ebay), and using it to select "Field Service Mode". I need to put it in Field Service Mode but it only shows how to do it with a 12 pin connector using a paper clip, but I only have a 16 pin connector. Pin 6 is the "field service mode" pin while pin 4 & 5 are grounds. Would grounding pin 6 to either ground put my car in field service mode and would I have to do this with the engine running? How would I do this? I looked up "field service mode" in the archives, but didn't see anything on how to do this with a 16-pin connector.
This site will explain it thoroughly.
http://www.corvettephotographs.com/c4vettes/index.htm
Last edited by Red Dwarf; Aug 12, 2007 at 11:05 AM. Reason: additional info
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From: Louisiana
I have a quick question which I wasn't able to find the answer to in the archives. Is it possible to fail a compression check even if you don't find water in the oil and have no smoke coming from the exhaust? I've dealt with this overheating problem for over 3 years (when I had time and a place) and it is still baffling me. Thanks for for your help.
Racer
Joined: Nov 2006
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From: Muskego Wisconsin
Wouldn't cause your overheating prob though.
Also, having a hard time understanding how an EGR valve would\could cause overheating.
Last edited by ineVETTEable; Aug 12, 2007 at 11:47 AM.
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From: Louisiana
I was reading in the GM service manuals about the possible causes of overheating and ran across some paragraphs regarding the egr which stated that if the egr was bad, it would cause bad emmissions and the exhaust buildup in the manifold or something like that would also cause overheating as well.
