My sonoma keeps getting the p0300 code at freeway speeds and anytime the engine stays above 2000 rpm for any extended period of time. ive changed the pcv valve, cleaned out the MAF sensor, checked my vacuum lines, and have even tried fuel injector cleaner. the light comes on for a while, flashes a few times, goes out, then the next time it starts flashing it will stay on until i return to city speeds for a day or two. the year model i have does not have an egr valve from what ive heard and yes ive searched all over for it. its a 2000 model. Ive heard so many things about how to solve this problem but idk what to do. engine doesnt seem to misfire honestly. doesnt seem to run rough when the light is on. the fact that its coming on though is annoying and id like to get to the bottom of this problem as soon as i can.
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Re: p0300 code problems
I had a similar problem, it turned out to be the fuel filter. Since then I also run Sea Foam Engine Treatment every 2nd or 3rd oil change, half in a full tank of gas and half in the crank case. The only time I've had the problem since is when I've forgotten to add the Sea Foam when I should.
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The engine may misfire and/or buck while driving at freeway speeds with no fault code stored in the powertrain control module (PCM). This can be caused by an intermittent fault with the camshaft synchronizer assembly. This condition can be diagnosed by monitoring knock sensor data as per Ford service bulletin #05-22-12. Replacement of the synchronizer assembly will be required to correct this concern.
Code p1270 Indicates the vehicle has been operated in a manner which caused the
engine or vehicle to exceed a calibration limit. The engine RPM and
vehicle speed are continuously monitored and evaluated by the PCM. The best way to stop this code from coming back is to make sure the vehicle is not driving at a high rate of speed... or the engine is not at a high rpm for a extended period of time.
P0410 Secondary Air System PerformancePossible Causes Setting Conditions
AIR solenoid Ignition circuit is open (check the U/H IGN fuse)
AIR pump has failed (inspect air pump for water)
AIR system check valves and/or pipes are damaged or leaking
AIR system hoses or lines are damaged, pinched or kinked
Base engine problem (e.g., excessive exhaust back pressure)
PCM has failed
P0300 Multiple Cylinder Misfire DetectedPossible Causes Setting Conditions
Base engine mechanical fault that affects one or more cylinders
EVAP system problem or the EVAP canister is fuel saturated
EGR valve is stuck open or PCV system has a vacuum leak
Fuel delivery component fault that affects two or more cylinders
Ignition system fault (a coil) that affects more than one cylinder
You may have got a slug of water in the gas, try some additive and see if it will clear up. If it dosent best do a fuel pressure test, i don't know why but pumps have been known to go out just after a fill up.
Disconnect the positive lead to the battery wait about 30 seconds and reconnect. This should reset the error light. Now go where you can floor it and go through the gears a couple times. This will establish a new acceleration curve. Now go on the freeway and see what happens. If it's a real problem the light will come back on. If so take it to a shop that has a computer to plug into your vehicle - this will be able to tell anything that's wrong.
Had the same problem on my brothers Rav4. We changed the Plug wires and the problem is corrected. He had changed the plugs a couple of months ago. We had the code read at Advance Auto, it came up P0300 Random misfire. His old wires looked fine also.
I've got Hyundai Lantra 1.6 year 2000. It's take time to start when it's hot. When I start my car it revs at about 2k-3k rpm. It also does it when I come to a stop. When I come to a stop it will stay at a higher rpm than that of idle speed. It drives ok when on freeway but uses more petrol. I have changed the water & petrol pump but no luck
you jave a biggie here.
here is some info CIRCUIT DESCRIPTION The Powertrain Control Module (PCM) monitors the difference between engine speed and transmission output speed. In D3 drive range with the TCC engaged, the engine speed should closely match the transmission output speed. In D4 drive range, with the TCC engaged, the TCC slip speed should be -20 to +60 RPM .
When the PCM detects excessive TCC slip when the TCC should be engaged, then DTC P1870 sets. DTC P1870 is a type B DTC.