Rough idle on cold start an black smoke

What is your question?

At every cold start the car idles very rough almost stalling. An at the same time it has black smoke coming from exhaust. It does this for about 45 seconds then clears up an runs normal after the fact.

What makes this problem better or worse?

Only on cold starts

How long has your 2009 Pontiac G8 had this problem?

3 weeks

Visitor

in Mountain View CA

Aug 29, 2019

Popular Answer

What are the best Pontiac repair shops?

RepairPal Certified shops can diagnose and repair your 2009 Pontiac G8. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

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What is your question?

Popular Answer

Rough idle on cold start an black smoke

What is your question?

What makes this problem better or worse?

Only on cold starts

How long has your 2009 Pontiac G8 had this problem?

3 weeks

Visitor

in Mountain View CA

Aug 29, 2019

1 Reply

Popular Answer

pushrodon Aug 29, 2019

Professional scan test - cold engine - coolant temperature sensor protocol.

pushrodon Aug 30, 2019

May require leaving vehicle at auto repair facility overnight - testing must be performed while engine is COLD - diagnostic equipment will need to be connected and operational with testing in progress ‘before’ engine is started.

Top Tireson Aug 30, 2019

come m we can check your car for free. We are in 10530 Carmenita Rd. Whittier, 90605

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Popular Answer

What are the best Pontiac repair shops?

RepairPal Certified shops can diagnose and repair your 2009 Pontiac G8. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.