non start issue
03-17-2019, 07:12 AM
#1
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Join Date: Sep 2003
Posts: 372
non start issue
93 Z28 Camaro. engine cranks, battery at 12.2 volts. Fuel pressure at 47Lbs while cranking and holds the pressure. No spark, no spark to the plugs . Noid light does not illuminate while cranking. Fuel tank 1/2 full. Car is driven several times a week. It was driven the previous day.
Suggestions as where to test next would be appreciated
Suggestions as where to test next would be appreciated
03-17-2019, 11:10 AM
#2
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Join Date: Nov 1998
Location: Hell was full so they sent me to NJ
Posts: 70,645
Re: non start issue
Scan for codes (using paper clip, if no scanner). Look for DTC 16, loss of low resolution pulse from the Opti optical cam position sensor. Shuts down injectors and prevents ECM from correctly timing spark, so no spark. That code does not turn on the SES light.
Or, use Shoebox's procedure:
4th Gen LT1 F-body Tech Articles
On a 94 and up, you can watch to see if the tach needle moves up a few hundred RPM while the starter is cranking the engin. Works 94 and up ecause the PCM drives the tach. Won’t work with a 93 because tach is driven off the coil, and the ECM isn’t firing the coil, via the ICM.
Or, use Shoebox's procedure:
4th Gen LT1 F-body Tech Articles
On a 94 and up, you can watch to see if the tach needle moves up a few hundred RPM while the starter is cranking the engin. Works 94 and up ecause the PCM drives the tach. Won’t work with a 93 because tach is driven off the coil, and the ECM isn’t firing the coil, via the ICM.
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