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Obd II DTC PO301 PO303 PO305, MISFIRE I CHANGED ALL SPARK…

Customer Question
Obd II DTC PO301...

Obd II DTC PO301 PO303 PO305, MISFIRE I CHANGED ALL SPARK PLUGS AND INTAKE MANIFOLD GASKET . PRIOR TO REPAIR I GOT DTC OF PO302, PO304 AND PO306 PROBLEM STILL EXISTS, ENGINE LOPES AT 1500RPM. I HAVE A 2007 CADILLAC CTS 3.6L V6

Mechanic's Assistant: How many miles are on the car? When did you last change the plugs?

113,000 I just change all the plugs 2 days ago when I TV cylinder 2, 4,6 misfire, now I get misfire on cylinder 1,3,6,

Mechanic's Assistant: Are you fixing your CTS yourself? What have you tried so far?

Yes, just the plugs and intake manifold gasket

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

That's all I have so far

Submitted: 7 months ago.Category: Cadillac
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Answered in 8 minutes by:
11/13/2017
Cadillac Mechanic: Chris (aka- Moose), Cadillac Technician replied 7 months ago
Chris (aka- Moose)
Chris (aka- Moose), Cadillac Technician
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This sounds more like a timing concern. Can you check the compression on each cylinder and give me the readings?

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Customer reply replied 7 months ago
I will see what I can do .thank you for your response.
Cadillac Mechanic: Chris (aka- Moose), Cadillac Technician replied 7 months ago

You are welcome

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Cadillac Mechanic: Chris (aka- Moose), Cadillac Technician replied 7 months ago

Hello Chris here again,

I am checking in to make sure you got everything you expected from my answer. The option to rate my response or reply is still available. I want to make sure you were pleased with what you paid for.

Thanks Chris

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