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crankshaft sensor

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Old Jul 5, 2009 | 01:09 PM
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Default crankshaft sensor
I have a 1993 corvette that will not start. It cranks but won't start. I changed the fuel pump because it was not getting the correct pressure. I also cleaned the rails for the injectors. When I checked the injectors wiring they do not pulse but are hot constant. I believe it may be the crankshaft sensor. Where is it located any help would be great.
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Old Jul 5, 2009 | 01:11 PM
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inside the optispark.
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Old Jul 5, 2009 | 01:11 PM
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Your 93 doesn't have a separate crankshaft sensor.
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Old Jul 5, 2009 | 01:13 PM
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Originally Posted by jsiratt
I have a 1993 corvette that will not start. It cranks but won't start. I changed the fuel pump because it was not getting the correct pressure. I also cleaned the rails for the injectors. When I checked the injectors wiring they do not pulse but are hot constant. I believe it may be the crankshaft sensor. Where is it located any help would be great.
There is no crankshaft sensor on a '93 LT1. The Optispark determines crank position via the low resolution pulses delivered by the Optical wheel.

just FYI, the '96 was the only year C4 with a CPS.

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Old Jul 5, 2009 | 01:13 PM
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any idea what the problem could be
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Old Jul 5, 2009 | 01:16 PM
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Any codes?
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Old Jul 5, 2009 | 01:17 PM
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Originally Posted by jsiratt
I have a 1993 corvette that will not start. It cranks but won't start. I changed the fuel pump because it was not getting the correct pressure. I also cleaned the rails for the injectors. When I checked the injectors wiring they do not pulse but are hot constant. I believe it may be the crankshaft sensor. Where is it located any help would be great.
Did you use an inductive pickup noid light to check for injector pulses ??

You can't just put a DVM on the connector as you are not looking for a static voltage.

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Old Jul 5, 2009 | 01:17 PM
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how would i fix this?
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Old Jul 5, 2009 | 01:19 PM
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there is constant voltage on both wires going in but no pulse when crnking
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Old Jul 5, 2009 | 01:20 PM
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where is wheel located?
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Old Jul 5, 2009 | 01:21 PM
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no codes
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Old Jul 5, 2009 | 01:21 PM
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where is the optispark?
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Old Jul 5, 2009 | 01:22 PM
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Originally Posted by jsiratt
there is constant voltage on both wires going in but no pulse when crnking
You can't use a digital voltmeter to get any meaningful results on the pulsing of your injectors. The DVM cannot react in such a fashion. One wire will have constant voltage and the other is switched back and forth from "open" to ground.

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Old Jul 5, 2009 | 01:23 PM
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Originally Posted by jsiratt
where is the optispark?
Under the water pump.
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Old Jul 5, 2009 | 01:24 PM
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Originally Posted by jsiratt
where is the optispark?
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Old Jul 5, 2009 | 01:25 PM
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I understand that I used a light and when tested the light stays on constantly with no pulse.
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Old Jul 5, 2009 | 01:28 PM
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is all part of one unit? with the distributor?
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Old Jul 5, 2009 | 01:31 PM
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The optispark is the distributor.
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Old Jul 5, 2009 | 01:31 PM
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Forgetting about the injectors for a moment, have you checked for spark ??

<AIR> <FUEL><SPARK>

Let's figure out which one you are missing.....

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Old Jul 5, 2009 | 01:32 PM
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Thank you guys for all your help
this site is great.
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