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06 envoy 6 cilynders P0300 car running nice but engine light…

Customer Question
06 envoy 6 cilynders...
06 envoy 6 cilynders P0300 car running nice but engine light is flashing spark plugs check, coils, mad sensor, no lean codes, just theP0300 when I go to more rpm the light stop flashing is just when is in iddle runs very good but I can't find the issue
Submitted: 6 months ago.Category: GMC
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Answered in 4 minutes by:
8/2/2017
GMC Mechanic: Gunvir Singh,
 replied 6 months ago
Gunvir Singh
Category: GMC
Satisfied Customers: 1,947
Experience: Master Tech at Kennesaw Auto Tech
Verified

Hello, let me review your request. Please stand by,

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GMC Mechanic: Gunvir Singh,
 replied 6 months ago

Roughly how many miles do you have on the vehicle? has the vehicle overheated recently?

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Customer reply replied 6 months ago
I changed the engine with 89 k on it do you think is a blow head gasket?
GMC Mechanic: Gunvir Singh,
 replied 6 months ago

Not the head gasket but these engines are notorious for leaking valves.

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Customer reply replied 6 months ago
Sometimes the scanner shows the misfire in cilynders 1 and I reset the light and change to p0300
GMC Mechanic: Gunvir Singh,
 replied 6 months ago

On this vehicle the vehicle has to be driven a while before it pics up the exact cylinder misfire. Since it shows #1 cylinder misfire i will start by checking that first. Since you have already replaced the plugs and coils. Only thing left is the fuel injector and interal valve leak. A cylinder leakdown test will need to be performed to check if it has internal valve leak.

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GMC Mechanic: Gunvir Singh,
 replied 6 months ago

Do you have any other questions?

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Customer reply replied 6 months ago
When is not in iddle runs fine do you think is going to get worse?
GMC Mechanic: Gunvir Singh,
 replied 6 months ago

Eventually it will, just a matter of time.

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GMC Mechanic: Gunvir Singh,
 replied 6 months ago

Do you have any other questions?

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GMC Mechanic: Gunvir Singh,
 replied 6 months ago

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