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Old 07-13-2009, 11:29 AM   #1
Stevo
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2000 Astro P0304 Cylinder 4 Misfire Detected

I hope someone can help me with this please. A couple of months ago my Astro had a service light on so I checked the codes. It was crankshaft position sensor. So I replaced the crankshaft position sensor and additional items (fuel filter, coil, PVC valve & hose, lock fuel cap).
About a thousand miles later the van would not start. I replaced the pickup coil (under the distributor cap), distributor cap and rotor. It ran fine after that.
Now two months later the engine started running very rough. It would run rough at about 1500RPM while parked. The code was Multiple Cylinder Misfire Detected. So I now replaced spark plugs and spark plug wires. It seemed to run just fine after this so I took the van out for the day. While on the highway at about 65MPH the engine light came on and started running rough again. The code was P0304 Cylinder 4 Misfire Detected. I have detected this code before, I do not recall where in this whole process.
All these parts are new: spark plugs, spark plug cables, distributor cap, rotor, coil, pickup coil, crankshaft position sensor, fuel filter, fuel cap, PVC valve.
I have thought to next check resistance for the cap at #4. Faulty new distributor cap is possible?
One other note: I have noticed the transmission shifts rough into 2nd gear.
Thank you very much for any help.
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Old 07-13-2009, 11:16 PM   #2
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Sounds like possible fuel injector problem (common).
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Old 07-28-2009, 12:46 PM   #3
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Thanks

I ran two types of cleaner in the fuel system and it seems to be okay for now. It looks like replacing injectors on the vortec model may require some work. They are not exposed for easy replacement at the intake.

Thanks for you advice.
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Old 07-29-2009, 01:19 PM   #4
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They are a spider injector system. May be able to replace individual injcetors, but suggest the complete unit.
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Old 09-09-2009, 04:10 PM   #5
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Followup to this

I ordered upgrade kit for the Sequential Central Port Fuel Injection to the MFI system. This takes the injection from 6 injectors to 1 injector. This is the bulletin number: 00-06-04-003B
I will post how this goes.

Thanks again.
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