Q: Misfire but when get up to 60 to 70 miles and hour, it runs smooth
Vehicle inspection report. Co gpm is 21p3110 should be 15.000. Check Engine Light is on. PO300 Random /Multiple Cylinder Misfire Detected.
My car has 172000 miles.
My car has a manual transmission.
Recommended Services
| Fuel Pump Replacement | $145.32 - $1299.70 | Get a Quote |
| Oxygen Sensor Replacement | $123.80 - $932.74 | Get a Quote |
| Catalytic Converter Replacement | $288.41 - $1959.69 | Get a Quote |
| Engine is misfiring Inspection | $94.99 - $114.99 | Get a Quote |
Hi there. When I get these readings during an emissions test I usually start by checking the fuel pressure. A lean running condition from a weak fuel pump will cause this. If the fuel pump is fine, then I install a scan tool and monitor the sensor readings as a bad oxygen sensor or air flow meter will also cause this. It can also occur from a failure in the catalytic converter. If you need to have this misfire and emissions problem checked, consider YourMechanic, as a certified technician can come to your home or office to diagnose why the engine is misfiring.
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
What others are asking
Front brakes rattling going downhill and steering wheel shakes.
Despite having the disc brakes and brake pads replaced on your Dodge Durango, there can be other reasons that could be producing these concerns. With the front brake rattling and steering wheel shaking, it is possible there was a part...
Car stalling randomly
With the illumination of the Check Engine Light, a fault code is generally stored in the system, and can be scanned by a mechanic. The engine computer relies on several signals from sensors for vital information to keep the engine...
Is it worth fixing
Hi there, thanks for writing in about your 2000 Cadillac Escalade. If you overheated the engine until it died, then you may have damaged the engine internally on cylinder number 4. Your water pump (https://www.yourmechanic.com/services/water-pump-replacement) is most likely the part...
Can't find radio fuse
Hello there, chances are there is a bit more going on than just blowing a fuse (https://www.yourmechanic.com/services/fuse-replacement). When a fuse blows there a few possible causes such as a failing radio, short in the wiring, or too much load on...
How much does a used power steering pump cost on average?
Hello. The cost of a used power steering pump will vary depending where it comes from. Some wrecking yard will charge much more than others. From your description of the problem it may not need a pump. It may have...
Transmission stopped working suddenly with no early indications whatsoever.
Hello there, a variety of issues will cause your 2004 Honda Civic Hybrid to not move in gear. The most common is shift linkage failure, this is the linkage which places the transmission in the selected gear. Other likely faults...
My truck is stuck in 4L or 4H also the speedometer is saying I'm going 100 mph when I'm only going 20 mph. Is my GEM Module bad?
Hi there. The issue could be with the output shaft speed sensor on the tail shaft of the transfer case. The output shaft speed sensor is a sensor the registers the speed of the output shaft and lets the computer...
2006 Infiniti G35 has check engine light on for code P0153
Code P0153 is for Air/Fuel Ratio Sensor Slow Response Bank 2 Sensor 1. It's true that this code can be set by one or more failed fuel injectors causing a lean condition, but there are several other potential causes as...
Head set changed to spanis. I need english
Hi Beverly. We really need your car's information to help you here. Each manufacturer has unique steps that need to be completed to change the language settings for their information center. Please let us know this valuable information and we...
Related articles
6 Essential Things to Know About Horsepower
Horsepower Horsepower is one of those terms that everyone recognizes, but just try asking someone what it means. You’ll more than likely receive a blank stare or a quickly mumbled response that doesn’t really help. The following are six things...
How Long Does a Speed Sensor Last?
Today’s Today’s cars are equipped with a very wide range of sensors. Yours has a mass airflow sensor, at least one oxygen sensor, and many others. The vehicle speed sensor (VSS) is usually located on the transmission’s output shaft (although...
How to Replace a Coolant Temperature Sensor
The coolant temperature sensor switch is not working if the engine emits black smoke. The switch may have failed if the car gets poor fuel economy.
Browse other content
Estimates
Maintenance