randywalsh
New member
Howdy all, I own an 01GT. Love my car but its sick. Code p0300. Car has 174K mi. I also own an 84 Nissan p/u.
Last edited:
Texas panhandle new guy
- Thread starter randywalsh
- Start date
Explicit_Spade
Perma-Banned! JK LOL
Welcome!
Here's some info on that misfire code of yours:
Technical DescriptionRandom/Multiple Cylinder Misfire Detected
What does that mean?Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.
A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.
SymptomsSymptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present
CausesA code P0300 may mean that one or more of the following has happened:
Faulty spark plugs or wires
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
Defective computer
Possible SolutionsIf 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.
Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.
Here's some info on that misfire code of yours:
Technical DescriptionRandom/Multiple Cylinder Misfire Detected
What does that mean?Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.
A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.
SymptomsSymptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present
CausesA code P0300 may mean that one or more of the following has happened:
Faulty spark plugs or wires
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
Defective computer
Possible SolutionsIf 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.
Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.
randywalsh
New member
Thanks for the reply. I put new plugs and wires on 5k ago. New filters last night. Still not right. Probably to a pro Tues. a.m. Pressure reg.,fuel pump,cat. ??? I am a health inspector... Rotten egg smell I'd know.
Explicit_Spade
Perma-Banned! JK LOL
Check your coil packs, I have had a bad miss lately, I looked today and 2 prongs were rusted pretty bad.
KeithGTP03
GTP Level Member
Cool, Texas membership is growing! Welcome!
randywalsh
New member
Found out the cat was clogged. $410.00 ouch
dmahlikGT
New member
That much for what, a whole new exhaust system? I would just buy a $75 high flow cat and have an exhaust shop weld it in place for like $40.done.
Explicit_Spade
Perma-Banned! JK LOL
How much of that was labor?
randywalsh
New member
I picked up my 01 GP GT today. Bill was 359.00. Local shop replaced cat and some pipe. I brought my own k-y.... Jees Louis The car runs better than ever and sounds great. I'm thinkin it has been clogging for some time. My wife insisted I take it to get repaired so I wouldn't bust knuckles and cuss.. Thank you all for your help. I'll try to post a pic of my beauty soon.
Hippo Machine
Because Wet Leaves
Welcome!
