Q: check engine lit p0300,304,302,306 replace plugs and moved cops to diffirent postions still getting same codes.Change all injector

asked by on September 12, 2017

check engine lit. p0300,p0304,po302,p0306 replaced all spark plugs and removed COP to different position installed new injectors. Still getting p0300 and p0304,p0306,p0302

My car has 122000 miles.
My car has an automatic transmission.

I believe all of these cylinders are on the same Bank of the engine. With this in consideration the most likely cause after replacing all of those parts would be a vacuum leak on the intake manifold near that side of the engine. I would recommend having your vehicle smoke tested to determine if smoke comes out of the intake manifold in that area. If so check for cracks in the intake manifold. If no cracks exist simply replace the gasket.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Passenger side floorboard getting wet in rain.

Hello, if the car has a sunroof that's where I would start. This would require two people to perform a proper diagnosis. Using a garden hose you would run across the top of the car and look for a leak....

Air suspension system issue on 1997 Lincoln Mark VIII

Hello. Thanks for writing in about your 1997 Lincoln Mark VIII. I suggest that you have a technician test a power and ground going to the air ride relay and pump. Some particular make and model have experienced corrosion on...

Speakers have no sound

Hi there. Since your vehicle is equipped with premium sound, it has a separate amplifier powering the speakers. If this amplifier does not receive a signal to turn on, it will not power your speakers. Also, if your amplifier has...

Related articles

A Buyer’s Guide to the 2011 Toyota Land Cruiser
This This multi-tasking full-size SUV offers all the versatility of a traditional mini-van with the amenities and comfort level of a high-end sedan. Add in the 4WD that allows you to chew up rough terrain if desired (or necessary) and...
How to Get Lincoln Dealership Certified
Lincoln dealerships offer automotive technician jobs to those who are Lincoln certified through UTI’s Ford Accelerated Credential Training program.
A Buyer’s Guide to the 2011 Dodge Dakota
2011 2011 marked the final year of production for Dodge’s venerable Dakota pickup truck. It was a compact pickup, not quite the size of the Ram, and competed with similar models like the Chevy S10 and the Ford Ranger (both...