0
1996 buick century 3.1 that has p0300 code and missfire data on all cylinders what could this be other then a ecm?
Wiki User
∙ 15y ago
P0300 Diagnostic Code - Random Misfire
Symptoms.
Engine may stumble or miss
Engine may be hard to start
you may notice no issues
Cause
Failing spark plugs or spark plug wires
Bad coil or coil pack
Failing oxygen sensor(s)
Bad fuel injector or more than one
Stuck exhaust valve
Bad catalytic converter
EGR valve or valve passage clogging
Bad camshaft position sensor
Bad PCM or ECM
The Fix
Best first action is a tune up, new plugs, wires, inspect all hoses and wire connections then reset the code. If it returns you will need to narrow it down to a system, coils and coil packs should be tested, catalytic converters for function ( do you smell rotten eggs?). A misfire that jumps cylinders could indicate a lean condition, do you have any other codes along with the 300? this will help clue you in to the source, check valve function to make sure they are opening and closing fully.
This is probably pone of the most difficult codes to troubleshoot, so start with the basics and work your way into the more expensive options, in many cases a good old tune up solves the problem, back it up with a fuel system cleaning and see where you stand.
Wiki User
∙ 9y ago
Wiki User
∙ 15y agoYou will need to replace the fuel injectors, this is a common problem.
Add your answer:
Earn +20 pts
Power steering pump Buick century?
I have a 2000 Buick Century costom and I replaced it but it leaks what could be wrong
Where can you find a vacuum diagram for a 2000 Buick Century?
i have a 2000 buick century and the evap comes on where and what could be setten off the evap ?
What could cause a 1996 Buick century to have water in oil?
i have a 1996 buick century just came back from mechanic head gasket is gone and there is anti freeze in my oil i guess if you had water in your rad then you would have water in your oil.
What would cause a multiple or random missfire on a 1997 Buick Skylark you replaced everything electrical on it the only thing left is fuel system?
Did you try correcting the ignition firing order, from the ignition coilpacks, leading to your spark plugs? Also Unless you have a PCM scanner, or has had your Buick scanned, & know for sure you are in fact having a misfire, I would look into your fuel system (fuel rail, fuel injectors, fuel pressure check.). You may have a clogged injector spraying at two or more of your cylinders, causing a misfire.... I hope this information could help you. mdjblue78@yahoo.com
What could be the problem on a 1999 buick century when it takes 15 minutes to warm up?
Thermostat is stuck open.
Why are exhaust manifolds turning red on 1993 Buick century 3.3?
the catilatic converters could be stopped up.
Where is the orfice tube located on a 2002 Buick Century?
Some are in the inlet to the evaporator and some could be in the condenser line.
What are code po300-301-306 for A 1998 Plymouth Voyager 3.0 L?
P0300 = Random Multiple Missfire Detected - Multi Cylinder Miss Fire Actually a failure not located in the cylinders, but on the ingnition or the fuel supply, or a very bad condition on the intake ( vaccum leak ) P0301 = Cylinder 1 missfire detected. P0306 = Cylinder 6 missfire detected. If you have all tree codes, start by checking the fuel delivery, fuel pressure, air intake, plug wires, plugs, vaccum leaks. Also could be a cracked head of a bad head gasked.
What could be the problem with a 1998 Buick Century that starts smelling of gasoline inside at idle?
Leaking fuel. Get this fixed ASAP.
Have replaced fuel filter and fuse is good what else could it be car won't start on a 93 buick century?
hello how are you?
What would cause water leak into the floor panel of the passenger side of a 1986 buick century?
It could be the heater core leaking.
IF a 2002 buick century Loses power climbing hills what could this be?
Could be tune up time including air and fuel filters. Could also be a plugged catalytic converter.
