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Old 12-08-2017, 12:07 PM   #7
Tech II
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Join Date: Jul 2011
Location: Worcester, Massachusetts
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Re: 96 Wagon Code P0300, running rich

Best way to check CTS is a cold engine before startup....IAT should equal CTS....

You have a flashing CE light....that means a bad misfire.....doesn't your scan tool count misfires per cylinder? Scan tool should be able to narrow it down to a cylinder....

You replaced the Optispark....whole unit? Cap, rotor, optispark, etc? New or used?

Wires should have been replaced, as well as plugs(using OEM)......also check the wire out of the coil for carboning/rust/arcing......also do a coil output test.....

If it's not secondary ignition, check compression......if ok, possible injector....

I remember when someone would bring in their Firebird with an LT1 engine, at around 100K....would ask them if they ever had a complete tuneup?

Usual answer was no.......they would ask how much it would cost, thinking under $150-200......when you told them it was around $500, minimum, they wanted to pass out......or they would think, I can do a tuneup at home.......

Doing a complete tuneup on these LT1's was a nightmare, because it involved removing the water pump to get to the cap/rotor, and if the w/p had never been replaced, you were putting a new one on, because that weep hole was right on top of the optispark......removing/replacing wires was a nightmare......getting at the plugs was not easy.....and you never did it on a hot engine....customer would have to leave it overnight...
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