Engine Misfire - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

 
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post #1 of 5 (permalink) Old Mar 18th, 00, 05:26 AM Thread Starter
 
Join Date: Mar 2000
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Question

I have a '96 Z28 with an LT1. Lately the car has been running rough and has sent a misfire code to the computer numerous times. The last code I got was P0300 Random/Multiple Misfire. The car stumbles and hesitates when in the 1500 to 2000 RPM range. After 2000 it seems fine. I've tried many remedies such as: new plugs and plug wires, injector cleaner, new cap and rotor, new coil wire. I've checked for vacuum leaks and everything seems fine there. I'm at a loss as to what could be causing this. Any help is greatly appreciated.

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post #2 of 5 (permalink) Old Mar 18th, 00, 06:19 AM
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Join Date: Nov 1999
Location: West Richland, Wa. USA
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Double check the plug wires to make sure they are in the correct firing order.

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68SS ZZ4, 4sp T-10, 12 bolt, getting painted

78Z28, 330hp vortec, TH350, 10 bolt (just finished)
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post #3 of 5 (permalink) Old Mar 18th, 00, 04:17 PM
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Steve
 
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Join Date: Apr 1999
Location: Grove City, Ohio, USA
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New Cap and New Rotor in a '96 Z?!?!?!

Do you mean you replaced the Optispark?

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Steve McCorry - Central Ohio Camaro Club
'69 Camaro RS/SS-350 - Daytona Yellow
'95 Camaro Z-28 - Sebring Silver
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post #4 of 5 (permalink) Old Mar 18th, 00, 07:22 PM Thread Starter
 
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I didn't replace the entire optispark setup. I replaced the outer cap, the rotor and the plastic cover. I still have the original photo emitter/receptor and metal discs.
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post #5 of 5 (permalink) Old Mar 18th, 00, 07:23 PM Thread Starter
 
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All the plug wires check out in the correct firing order.
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