Question about Cars & Trucks

1 Answer

I have replaced the throttle position sensor, all plugs and coils and the camshaft position sensor. I am getting codes 300, 305 and 355.

If I unplug the battery and let it sit for a few it starts right up and runs great for awhile but then codes will start coming back.

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Cars & Trucks Master
  • 15,575 Answers

What make vehicle , model an year . P0300 is a random misfire , P0305 is a misfire on cylinder # 5 P0355 P0355 Ignition Coil Primary Secondary Circuit Malfunction Could be a bad PCM .

Posted on Mar 27, 2016

  • Michael Smith Mar 27, 2016

    it is a 2000 jeep grand cherokee 4.7L. I think its weird if I unhook the battery for awhile then reconnect the codes go away for awhile and it runs perfect.

  • Jeff Armer Mar 27, 2016

    I'm not sure about Jeeps but some manufactures have a strategy programmed in the computer , that if a misfire happens , to protect the transistor that controls that coil. It will shut it off an resetting the PCM Will get it working again . Till the problem happens again. I would look for a wiring problem on cylinder #5 .Do you know how to read a wiring diagram ? Go here free wiring diagrams . There are some good videos on youtube , basic electrical trouble shooting , trouble shooting all the codes you have . Myself P0355 is the code I'd checking out . I have service info for ford an GM ,diagnostic trouble flow chart . It could work for your problem .



1 Suggested Answer


6ya staff

  • 2 Answers


Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

Have a 1996 falcon which has rusty water coming from the exhaust pipe this vehicle has been sitting for awhile but has been started and let run for awhile it does not appear to be over heating and see

If the cooling system has not lost coolant there is no fault . there is moisture in the exhaust system from sitting so long. should clear up when the engine dries the system out. Keep a eye on the coolant level or may be change it.

Sep 21, 2014 | 1997 Ford Falcon

1 Answer

Car will not start after it runs for awhile, starts fine cold and runs great 2002 eclipse spyder

sounds like my truck. some security code issue. gonna have to take it to the shop

Jan 08, 2013 | 2002 Mitsubishi Eclipse

1 Answer

Going down the road runs great then starts loosing charge sit awhile and push off runs great. put new altenater on it i can reve motor up if running lights and starts running good

Either have a bad battery, sometimes they go bad and the symptom is a "self" discharge that will run it down in a few days..
You have something inside the car that's running it down.

The way to check is to unhook the battery for the time that its down and see if the battery is dead when you return. If the battery goes flat unhooked, you have a bad battery. If the battey holds its charge while unhooked you have a drain from the car.

Your car I think was bad about one of the cooling fan relays sticking "on". Just something to be aware of.

Jun 06, 2011 | 1984 Porsche 944

1 Answer

My 2002 LS is hard to start after it sit awhile I change the fuel filter and the spark plugs and the coils on each plug but it still hard to start could it be my fuel pump is losing pressure when it sit...

it is very possible and i can tell you a way to help you see if that is the issue. after your car has sit a while (as long as it usually takes before it acts up) jump in the vehicle and turn the key to the postion just before the vehicle begins to turn over when all the dash lights come on. when the key is put in this position the fuel pump runs for a few seconds and then stops until vehicle is cranked, allow the pump to run for 5 seconds then turn the key back off. then return the key to the "run" postion i mentioned before and wait a few seconds then try to start it. if it fires right up you have allowed the vehicle to build fuel pressure before you started it, indicating you have a fuel pressure issue and you are most likely looking at a weak fuel pump.

Dec 10, 2009 | 2002 Lincoln LS

1 Answer

91 diesel trouble starting chevy suburban

I would be more suspicious of the fuel system. Have you changed the filters lately? Do you have a 6.2 or a 6.5?

Aug 10, 2009 | Chevrolet Suburban 1500 Cars & Trucks

1 Answer

1997 Ram 1500 won't start after running a while

Sounds like crank sensor problem,or fuel pump.

Jun 18, 2009 | 1999 Dodge Ram

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

72 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts


Level 3 Expert

85216 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22485 Answers

john h

Level 3 Expert

22486 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides