Out like a light.

[Stormyweather]

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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[Injuneer]

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_test

[Stormyweather]

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.

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[Fastbird]

Sound like when my ICM died once. Driving along and then poof, dead. Little while later, fired back up and lasted a few minutes, then poof, dead.

[Stormyweather]

Sound like when my ICM died once. Driving along and then poof, dead. Little while later, fired back up and lasted a few minutes, then poof, dead.

Yup just like the key went out. Haven't tested it yet need my meter but its at work.

[Stormyweather]

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?

[Injuneer]

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.

[Stormyweather]

Yeah my laptop needs to charge what am I looking for with Garydougs program?

[Injuneer]

Codes. Data log of the engine trying to start.

[Fastbird]

Random thought........could the ignition switch be going out?

[Stormyweather]

I was thinking that. And a good question

[Stormyweather]

https://www.ebay.com/itm/Optispark-reconditioning-service-with-data-that-it-works/322692854278?epid=2211552581&hash=item4b21fe3206:g:Tj0AAOSwVm5ZARQg
Anyone use this guy?

[Jakegsxr11]

Here is a post from Injuneer in one of my recent threads :

http://www.ltxtech.com/forums/showthread.php?p=492439

That being said I just had to remove a new msd cap and rotor due to severe arcing from the cap to the water pump.....

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[Stormyweather]

Where does one get a good opti from?

[Cathead]

Where does one get a good opti from?Petris

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[Injuneer]

http://www.ltxtech.com/forums/showthread.php?31870-95-Formula&p=492438&viewfull=1#post492438

[Jakegsxr11]

You could try here, I've heard the remanufactured Delco ones are good but I have no personal experience.

https://www.rockauto.com/en/parts/acdelco,19383531,distributor,7108

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[Stormyweather]

http://www.ltxtech.com/forums/showthread.php?31870-95-Formula&p=492438&viewfull=1#post492438

They are out of stock im on the waiting list

[Fastbird]

Where does one get a good opti from?

EFIConnection. :D

[SSlowBoat]

amazon

petris is hit or miss. when i went to buy one 2 years ago there were alot of negative reviews on both their ebay store and other places. now for some reason i cant dig them up.

even delco doesnt have the Mitsubishi sensor anymore.

[Stormyweather]

A delco from amazon?

[SSlowBoat]

A delco from amazon?

no, just any regular old amazon opti. one i just grabbed was "most plus" brand and was 50 bux. opened up it looks the same as the delco i just took off the car full of oil. for the record the new delco's do NOT have the holy grail mitsubishi sensor anymore.

there is a website i will have to try to find again that sold just the optical sensor for the vented optis at like 20 a piece. edit here it is https://www.corvettemods.com/C4-Corvette-1992-1996-Optispark-Distributor-Replacement-Ignition-ModuleOptical-Sensor--Year-Options_p_20146.html