93 wont start - H72 code
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From: Punta Gorda, FL
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'13- '14
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93 wont start - H72 code - UPDATED
Turn the key, and it sounds like it wants to go. engine turns but doesnt fire. Everything was working fine til today. It seems to be getting fuel but the spark (according to the guy at the body shop) is not there. So I ran the code thing (paper clip trick) and got a code H72 in section 9.
Any idea what would be the cause of this?
Any idea what would be the cause of this?
Last edited by vetteweiser; Sep 13, 2004 at 06:17 PM.
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From: Punta Gorda, FL
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'13- '14
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anyone?
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From: sahuarita az
93 won't start
I had the same problem with my 93 about a month ago. I made all the checks as per the vette manual. It pointed to 2 things. The Opti and/or the module. Since I wasn't sure if the opti was any good or in what shape it may have been in I ventured to change the Opti, the water pump, all the hoses, and the thermostat. I also added vacuum venting to the Opti (I will post photos eventually). When I attempted to start the engine it did not. I then had a friend lend me the module off of a firebird and it fired up right away. Soooo, if you are so lucky and can get a spare ignition module make the test. You may get away with just changing the ignition module. This will take 10 minutes to do.
Race onnnnnnn
Race onnnnnnn
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From: Punta Gorda, FL
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'13- '14
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is that the ignition module on the passenger side of the engine that has two wires leading into it, one with a black connecter one with a gray connector??
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From: sahuarita az
93 won't start
that's the one. It sits next to the coil, held with 2 screws. Don't attempt to check with an ohm meter, if it isn't bad it will go bad. Try to get another module unplug yours and plug in the other module. If the problem is your module the engine should start.
RACE ONNNNNN!!!
RACE ONNNNNN!!!
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Thread Starter
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From: Punta Gorda, FL
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'13- '14
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Figures too that my car is at the paint shop now otherwise I'd swipe one off my dad's 93 and find out if it works. Thanks for your help 
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Joined: Dec 2003
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From: sahuarita az
93 won't start
no problem, anytime. When you do try, let me know the results.
Oh, by the way I had the same code and a few others. Don't know how they tie up with this problem. Maybe someone else can tell us.
race onnnnnn!!!
Oh, by the way I had the same code and a few others. Don't know how they tie up with this problem. Maybe someone else can tell us.
race onnnnnn!!!
Last edited by adelii; Sep 12, 2004 at 06:10 PM.
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From: Punta Gorda, FL
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'13- '14
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Here is an interesting twist. The car will crank but not start in Park. Put it in Neutral, and NOTHING. It acts like it would act if the car was in R D 3 2 or 1.
Gear selector switch?
Gear selector switch?
Melting Slicks
Joined: May 2004
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From: Lufkin Texas
St. Jude Donor '05-'06
Sounds like the park/neutral switch may have a prob but not likely your no spark problem. I just wanted to point out that the "H" in your code is for "History" so you may have had a little dimmer trouble at one time and the code 72 is stored but is unlikely anything to do with the current no start issue. You can unhook the neg post of battery for a bit to clear that code, then check and see if it ever returns.
The ignition module may be the answer, if you can swap it with another at no cost to test it then do so. You should also consider the VATS and do a search on VATS related troubles. If you have a sprare key with new pellet it may be worth trying after clearing code. Just my .2 cents. Good luck.
The ignition module may be the answer, if you can swap it with another at no cost to test it then do so. You should also consider the VATS and do a search on VATS related troubles. If you have a sprare key with new pellet it may be worth trying after clearing code. Just my .2 cents. Good luck.
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From: Punta Gorda, FL
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'13- '14
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Well, it was the ignition module and ignition coils. $500 later and she's up n running (got TB cleaned out too)
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From: hamilton ontario
Originally Posted by vetteweiser
Turn the key, and it sounds like it wants to go. engine turns but doesnt fire. Everything was working fine til today. It seems to be getting fuel but the spark (according to the guy at the body shop) is not there. So I ran the code thing (paper clip trick) and got a code H72 in section 9.
Any idea what would be the cause of this?
Any idea what would be the cause of this?
