C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Strange issue: Engine stalls at 180 degrees

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Old Sep 10, 2014 | 10:10 AM
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Default Strange issue: Engine stalls at 180 degrees

I have a strange issue where my engine stalls at approx 180-181 degrees. The back story: My Daughter's school is 5 miles from the house. For the past 4 days, as I am taking her to school, my 92 base model consistently stalls within 100 yards of her school. While observing the digital coolant temperature gauge, I notice the coolant just reaches 180-181 degrees when I get to her school. It is like one or two big hesitations. And yes, I have an 180 degree thermostat in the vehicle. I do not receive any ck engine type lights. I will tell you that I received a low coolant light last week and I did top off the coolant at the filler and the overflow reservoir. Maybe I need to bleed the coolant system. Can anyone tell me what is going on here.

Last edited by mixalive; Sep 10, 2014 at 10:16 AM.
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Old Sep 10, 2014 | 10:35 AM
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..... Ohm test the injectors ... they should ALL be around 16ohms ... and , if no spark , have the Ignition control module checked/replaced ... beyond that , start thinking new Opti-Spark ........
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Old Sep 10, 2014 | 03:38 PM
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Thanks..
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Old Sep 11, 2014 | 08:51 AM
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It did it at 178 coolant temp today. Please explain to me how if one of my injectors was out of resistant specification, it would shut them all off.
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Old Sep 11, 2014 | 09:19 AM
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Originally Posted by C409
..... start thinking new Opti-Spark ........
Sounds like the Opti is ready to die. If you have had to add coolant, it could be that the water pump is leaking coolant onto the Opti.
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Old Sep 11, 2014 | 09:47 PM
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It could be stalling when it goes into closed loop. You might want to monitor it or disconnect an O2 sensor to keep it in open loop just for a test.
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Old Sep 12, 2014 | 07:06 AM
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Originally Posted by jv9999
It could be stalling when it goes into closed loop. You might want to monitor it or disconnect an O2 sensor to keep it in open loop just for a test.
That would make sense. I will try that and report.
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Old Sep 12, 2014 | 05:40 PM
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Originally Posted by mixalive
It did it at 178 coolant temp today. Please explain to me how if one of my injectors was out of resistant specification, it would shut them all off.
..... The injectors share a common power source AND a common ground feedback to the drivers in the ECM ... if any one injector is out of spec , it will affect the pulse width of ALL ..........
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Old Sep 12, 2014 | 05:53 PM
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Get the noid light for the LT1 engine. When it stalls, disconnect a fuel injector connector. Plug in noid light, when the car cranks, if you don't see the noid light lighting up, it's opti. I did this on both of my 93 C4s.
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Old Sep 13, 2014 | 08:49 AM
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Great information. Thanks.
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Old Sep 13, 2014 | 08:53 AM
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Originally Posted by C409
..... The injectors share a common power source AND a common ground feedback to the drivers in the ECM ... if any one injector is out of spec , it will affect the pulse width of ALL ..........
Got it..
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Old Sep 13, 2014 | 01:42 PM
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Originally Posted by C409
..... Ohm test the injectors ... they should ALL be around 16ohms ... and , if no spark , have the Ignition control module checked/replaced ... beyond that , start thinking new Opti-Spark ........
I am getting 12.3 to 12.7 ohms. Is that too low?
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