The fault code P0301 means "Cylinder 1 Misfire Detected", you can erase the code with related code reader, such as the Godiag T300+ , it has many kinds of functions, but the price is a little expensive.
SOURCE: Misfire code P0301 2000 Taurus
Hi Sue,
Chances are when making your hose and tstat repair, you probably bumped a vacuum line enough to either create a tiny crack or knock off a line. First, you can just check all of the vacuum lines that are near where you worked and then all of them using the emission and vacuum diagram/sticker located either on the underside of the hood or above the radiator. The vacuum lines all originate from the upper intake manifold, which is the big multi-tube looking large thing on top of the engine. Unfortunately, if the leak is a small crack or slightly loose connection, they can be hard to find. If no luck, try listening to the engine with it running for a hissing/sucking.sound. If you have long hair be careful. Still no luck, if you have carb or similar cleaner, maybe WD40, or starting fluid, spray it carefully and precisely around the engine listening for the engine sound to noticeably change. That will be at the point where you have a vac leak that will need fixing. An alternative method that I like is to take a small diameter hose around 3 foot long (a short piece of garden hose, heater hose, fish tank hose, etc.) and use it like a stethoscope to listen around to pinpoint a hard to hear and pinpoint leak.
SOURCE: throwing P0301 and P0302 fault
those are misfire codes. Cylinder #1 & #2 in the firing order. Check for bad plugs first. Swap one of the misfires with a non misfire cylinder and see if that cylinder misfires. Or just change the 2 plugs. Put high temp anti seize on the threads if you ever want to remove them later.
Then change the 2 COPs (Coil on Plug).
Finally, check for plugged or bad injectors. CHevron Techron injector cleaner is the best. Add to 1/4 tank of gas for better cleaning.
Report results.
Please rate too. Thanks.
SOURCE: p0301
Check obvious first, starting at plug wire, to make sure it's getting spark to plug, then pull plug to see how/if, it appears to be firing. No spark to wire, check coil. If spark is good to plug, and plug firing, time to check if fuel getting there,and if no, could be caused by faulty oxygen sensor, bad injector, just as starters.
SOURCE: 98 E-250 Rough Idle; codes p0156,p1131,p1151,p0301,p0171,p0174+
po301 thru po306 all misfire codes cylinder 1-6 remove plugs and replace them..... set the plug gap first
i suggest u replace the wires also if they never been replaced all these misfire codes can set the others and one is for the oxygen sensor ( 02s or HO2S) CIRCUT MALFUNCTION do u know how to check wireing systems
do the tune up plugs (set gap) .052-.056 change the fuel filter also. clear the codes hows it run
this info is for 98 E-250 4.2Litre
what engine do u have 4.2L or 4.6L i know it is a v-6 by the codes
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