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My 1998 chevy astro transmission surges, but not all the time,plus the po440 error code is on, are these connected. and I am still getting a po300 error code. I replaced plugs wires and cap and rotor twice. better stuff the 2nd time. what gives.
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code p 0300 is random/ multiple misfires
each p 0300 code ( 0301,2,3,4 etc) indicates the piston at fault
this code can be from electrical , ( cap plugs wires etc ) but is mostly attributed to problem injectors and ecm injector controls --wiring and connections
check the other areas for the fault as you may be concentration on the wrong area
Maybe.
Codes 121 and 122 are for the throttle position sensor circuit.
Code 400 is EGR and codes 449 and 452 are for the EVAP system.
Code 1639 is for a problem with the 5 volt reference circuit from the engine computer.
The throttle position sensor could be failing which could prevent the gas pedal from working. And the 5 volt reference problem could shut down the computer which would kill the engine. EGR is an emissions component and EVAP is the system that vents gas fumes from the gas tank.
Codes are only a guide for a mechanic to troubleshoot the circuits involved. They do not mean a component is faulty.
po135 is o2 sencer on drivers side. will be the first one. po300 is random/multiple misfire.po404 is a egr code. po102 mass air flow circuit low input. po440 evap emission control system malfunction
Hi, the fillup issue is probably a bad evap vent valve, but could also be the purge valve. I would remove both and test them by using jumper wires to the battery. The codes 440 and 1676 indicate the evap system.
The code 300 is random misfire. This is not usually related to evap issues, especially if you are having issues at highway speed. I would fix the evap issue first, though and clear the codes. , See how it runs after that, and if it still runs bad, please see my tip at http://www.fixya.com/cars/r6715318-causes_gasoline_engine_misfires . These are genericinstructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
vent valve is hooked to the canister near the fuel tank:
po300 is a multible miss fire code like you have more than one spark plug breaking down and causing it to set a code.have you tried tuning up the engine with plus and wires?
tsb remove dist cap ,clean out breather holes i replaced cap and rotor at the same time. chevy has the problem with the 4.3l astro,s and blazer i have both.fixed the problem when buying the cap and rotor the directions inside will also tell you how to fix
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