Question about 2002 Kia Sportage

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P0307 solutins engine running rough

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Code p0307 refers to cylinder 7 --misfire detected.== causes --engine mechanical fault---wiring--ignition/fuel system---injector---ECT/MAF sensor---ECM I would check the connections on no 7 injector and the injector itself.

Posted on May 05, 2013


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2000 Jeep Grand Cherokee Laredo 4.7 liter code reads p0307 turn the car off when I turn it back on started misfiring and sputtering and wont stay started now help

code p 0307 is misfiring on no 7 cylinder ====causes --- engine mechanical fault ---wiring---ignition/ fuel system--injector --ECT/MAF sensor---ECM
look for low fuel pressure or ignition control module

May 31, 2016 | 2000 Jeep Grand Cherokee Laredo

1 Answer

My 1996 Buick Skylark Custom 2.4L Twin Cam engine shakes and rides rough what could be the problem. New Bwd sensor,coil pack and module,and Spark plugs.

Jodesha, Should have scanned for diagnostic codes, have engine and transmission mounts checked. Check for vacuum leaks and or injectors could be a problem.
Check the attached links,instruction and guides on diagnosing rough running engine. Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

How to Fix Rough Engine Idle Problems at YouFixCars com

The Lost Art of Diagnosing Engine Problems

Rough Running Engines Car Repair Information From MasterTechMark

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Have 3.0 24 valve engine has intermitten rough Idle and during driving at excelleration

What are the trouble codes set? Get them read for free at most auto parts stores.

Dec 10, 2014 | Cars & Trucks

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P0307 solutions

This is V8,spak plug,wire,coil.Is #7,check this all.

May 05, 2013 | 2002 Kia Sportage

1 Answer

I have a 1995 Mercedes Benz SL 500 that runs rough when started after sitting for several days.

hi Jhlightcap.

The Common Problem: Rough Running Engine

A properly-operating engine should run smoothly and without excess noise. If your engine starts operating in a manner that gives you the perception of "running rough", it is likely due to a handful of common causes. A mechanic would investigate these common causes first in order to rule out a simple explanation for the engine's unsatisfactory operation.
The common causes for rough running in an engine are:
  • Engine miss
  • Vacuum leak
  • Dirty fuel injectors
  • Carburetor problems
  • EGR valve
  • Ignition coil
  • Spark plug wires
  • have a look at this link.
Rough Running Engine James on Engines 2

Dec 10, 2017 | Cars & Trucks

1 Answer

Engine runs rough

unplug ur main wires an make sure there dry

Dec 29, 2012 | 1994 Geo Prizm

1 Answer

My Chevy 2500, 2001 runs rough when it cold outside

It can be issue with low fuel pressure,the fuel pump is getting old both needs to be checked.Also get the IAC valve checked.
Go through the related help links with similar problem,it may help:---
Click the links below:---
Engine Idles Rough and Dies?

van idles rough?

runs lean and idles rough?

Car still runs Rough after tune up?

2006 kia rio runs rough

Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed?

Rough idle, staling and Erratic shifting?

These details will help.

Nov 06, 2012 | Cars & Trucks

1 Answer

I need some codes for a 98 Dodge Durango po300/po302/po304/p1391/po307

P0300 - Random Misfire code
P0302 - P0304 and P0307 - Misfire code on cylinder #2, #4 and #7
This description and procedure work in all cylinders failed; A P0302, P0304 and P0307 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #2, #4 and #7.

Symptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present

A code P0302 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

Possible Solutions:
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

P1391 - Rough Road Sensor Performance

Circuit/System Description:
The engine control module (ECM) identifies engine misfire by detecting variations in crankshaft speed. Crankshaft speed variations can also occur when a vehicle is operating over a rough road. The ECM receives a rough road signal by a rough road sensor or an electronic brake control module (EBCM), if equipped with the antilock brake system (ABS). The ABS can detect if the vehicle is on the rough surface based on wheel acceleration/deceleration data supplied by each wheel speed sensor. This information is sent to the ECM by the EBCM through the rough road signal circuit. For vehicles without ABS, the ECM receives a rough road signal from a wheel speed sensor located at the front left wheel. The ECM can determine if the vehicle is on a rough road surface based on the signal from the wheel speed sensor.

Conditions for Running the DTC:
* The vehicle speed is between 5-100 km/h (3.1-62.1 mph).
* The DTC runs continuously when the above conditions are met.

Conditions for Setting the DTC:
The ECM detects that the change in rough road wheel speed sensor signal is less than 2 km/h (1.2 mph) while the change in vehicle speed is greater than 5 km/h (3.1 mph).

Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the B171 Rough Road Sensor.
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 2 and ground.
* If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test all components connected to the ignition circuit and replace as necessary.
- Ignition ON, test for 0.2-0.8 V between the signal circuit terminal 1 and ground.
* If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
* If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
- If all circuits test normal, replace the B171 Rough Road Sensor.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

May 04, 2012 | 2004 Dodge Ram 1500

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