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Thread: Out like a light.
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02-08-2020, 05:34 PM #1Xtreme Member
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Out like a light.
Driving home the other day car dies just like the key turned off. Rush hour as well, pulled over try to restart no go. Waited a few then tried again cant get out too close to the traffic so something has to work. Turn key on off to hear fuel pump. Yes I hear it gage dose show fuel.But tach isnt moving it move like it has power but no more. Called AAA. Then tried again bang I move the car so I can get out. LSS got home and just today tried again started but after 10 min it died no issues just out like a light.Check to see if tach moves nope. Now my question is I need a new coil, icm, opti, car?
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1995 Trans Am - CAI - TB coolant bypass - Headers & Performance Muffler - Poly mounts - stock LT1/A4 - 13.3 1/4 - 1.9 60 foot , driven daily.
2008 C6 Corvette LS3 Snake charmer Ram Air intake. 6 Speed Switchable mild to wild exhaust.
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02-08-2020, 06:04 PM #2LTx Guru
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The tach is driven based on the low resolution pulse from the Opti. The tach should move up 200-300 RPM while the engine is cranking.
No scanner? DTC 16 for loss of Opti low res pulse does not turn on the SES light.
Spark at the coil wire? At the plugs?
Test for Opti signals, using a multi-meter:
http://shbox.com/1/4th_gen_tech2.html#opti_testLast edited by Injuneer; 02-08-2020 at 06:07 PM.
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02-08-2020, 07:29 PM #3Xtreme Member
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Thanks its pouring rain now. I remember reading somewhere you said this wasnt sure. I'll check it out . It intermittent though It will start now but shut off when ever.
Sent from my LG-G710 using TapatalkLast edited by Stormyweather; 02-08-2020 at 07:33 PM.
1995 Trans Am - CAI - TB coolant bypass - Headers & Performance Muffler - Poly mounts - stock LT1/A4 - 13.3 1/4 - 1.9 60 foot , driven daily.
2008 C6 Corvette LS3 Snake charmer Ram Air intake. 6 Speed Switchable mild to wild exhaust.
2002 Silverado LT Extd Cab Z71 5.3 A4 Composite Bed Stock
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02-09-2020, 07:22 PM #4Long Live the Opti
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02-09-2020, 11:52 PM #5Xtreme Member
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1995 Trans Am - CAI - TB coolant bypass - Headers & Performance Muffler - Poly mounts - stock LT1/A4 - 13.3 1/4 - 1.9 60 foot , driven daily.
2008 C6 Corvette LS3 Snake charmer Ram Air intake. 6 Speed Switchable mild to wild exhaust.
2002 Silverado LT Extd Cab Z71 5.3 A4 Composite Bed Stock
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05-28-2020, 07:17 PM #6Xtreme Member
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Ok engine dies after 15 min of running changed the coil and ICM. Changed the coil cause I was there. Runs still dies had it at 1200 rpm this time to see if there was a miss fire. Nope just like the key turned off just like before. Question will the opti just shut off? Cause when I'm cranking there isn't any tach pulse at the needle after it dies. you can hear the pump so any suggestions? Vats?
Opti test?
1995 Trans Am - CAI - TB coolant bypass - Headers & Performance Muffler - Poly mounts - stock LT1/A4 - 13.3 1/4 - 1.9 60 foot , driven daily.
2008 C6 Corvette LS3 Snake charmer Ram Air intake. 6 Speed Switchable mild to wild exhaust.
2002 Silverado LT Extd Cab Z71 5.3 A4 Composite Bed Stock
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05-28-2020, 07:36 PM #7LTx Guru
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Yes. Opti module can lose internal connections when they heat soak. Particularly Chinese stuff. GaryDoug (author of Scan9495) has opened them up and repaired loose connections.
Fuel pump can also heat soak. Fuel pressure test gauge would identify that problem. But no tach movement seems to indicate the Opti. My statement of 200-300 RPM may be a little high. I've seen data logs and a video where the jump was barely to 175 RPM.
No access to a scanner? Scan9495 is useful, for only the cost of a cable.
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05-28-2020, 07:42 PM #8Xtreme Member
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Yeah my laptop needs to charge what am I looking for with Garydougs program?
1995 Trans Am - CAI - TB coolant bypass - Headers & Performance Muffler - Poly mounts - stock LT1/A4 - 13.3 1/4 - 1.9 60 foot , driven daily.
2008 C6 Corvette LS3 Snake charmer Ram Air intake. 6 Speed Switchable mild to wild exhaust.
2002 Silverado LT Extd Cab Z71 5.3 A4 Composite Bed Stock
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05-28-2020, 08:26 PM #9LTx Guru
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Codes. Data log of the engine trying to start.
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05-29-2020, 12:13 PM #10Long Live the Opti
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