Need help po300 code
#1
Need help po300 code
Changed plugs and wires,tested coils and fuel pressure, cleaned maf sensor and fuel injectors
What else can I do truck still has no power and runs very rough. I also changed the 02 sensors in front of the cat
What else can I do truck still has no power and runs very rough. I also changed the 02 sensors in front of the cat
#3
#4
Retired
I've seen a completely clogged cat cause low performance/sluggish, but never cause it to run rough.
How'* your coolant level?
How'* your coolant level?
__________________
Retired Administrator
2002 *-10 5.7 V8
2023 Jeep Rubicon Diesel
Retired Administrator
2002 *-10 5.7 V8
2023 Jeep Rubicon Diesel
#5
Senior Member
Posts like a Supercharger
One other thing to check is the dash temperature guage. If the coolant level is appropriate, but the dash guage indicates a "cold" temperature, the problem could be a bad coolant temperature sensor. With no coolant temp input, the ECM "thinks" the engine is running at -40 degrees causing random misfires to occur.
Had this prob on a TrailBlazer a while back when I replaced the head gasket.......forgot to reattach the temp sensor and didn't figure it out for a day. Reconnected the temp sensor and the misfires went away immediately.
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