multiple random misfires p0304 then po306 now just showing p0300

What is your question?

I was getting code po3o4 changed coils and now showing p0300 changed plugs, wires, still showing po300 then po306 changed ICM now showing p0300 only. What is going on here ?

What makes this problem better or worse?

when car warms up

How long has your 1999 Pontiac Grand Prix had this problem?

months

Visitor

in Elk Grove CA

Feb 8, 2020

Popular Answer

What are the best Pontiac repair shops?

RepairPal Certified shops can diagnose and repair your 1999 Pontiac Grand Prix. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

1999 Pontiac Grand Prix auto repair 1999 Pontiac Grand Prix estimates 1999 Pontiac Grand Prix questions 1999 Pontiac Grand Prix problems 1999 Pontiac Grand Prix recalls

What is your question?

Popular Answer

multiple random misfires p0304 then po306 now just showing p0300

What is your question?

I was getting code po3o4 changed coils and now showing p0300 changed plugs, wires, still showing po300 then po306 changed ICM now showing p0300 only. What is going on here ?

What makes this problem better or worse?

when car warms up

How long has your 1999 Pontiac Grand Prix had this problem?

months

Visitor

in Elk Grove CA

Feb 8, 2020

1 Reply

Popular Answer

midasmtephraimon Feb 8, 2020

A common issue found with these cars is the Lower Intake Manifold Gasket will create air intake leaks. However I would also double check the spark plug wires for any arcs of sparks.

Join the conversation!

Popular Answer

What are the best Pontiac repair shops?

RepairPal Certified shops can diagnose and repair your 1999 Pontiac Grand Prix. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

1999 Pontiac Grand Prix auto repair 1999 Pontiac Grand Prix estimates 1999 Pontiac Grand Prix questions 1999 Pontiac Grand Prix problems 1999 Pontiac Grand Prix recalls

1 Reply

Popular Answer

midasmtephraimon Feb 8, 2020

A common issue found with these cars is the Lower Intake Manifold Gasket will create air intake leaks. However I would also double check the spark plug wires for any arcs of sparks.

Join the conversation!

Tuffy Tire & Auto Service Center - Grandview

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Columbus, OH

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multiple random misfires p0304 then po306 now just showing p0300

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