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Rough idle on 2001 dodge stratus 2.7. Threw code P0303 so i replaced the ignition coil and is now throwing the code P0442. After fixing the ignition coil and resetting the computer it ran great for about 2 blocks then started idleing rough again throwing up the P0442 code whis is gas cap?...huh. My gas cap is fine so what else could it be?

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A loose or improperly affixed gas cap A non-conforming gas cap (i.e. not factory/original brand) A small leak/hole in a fuel vapor hose/tube Other small leak in EVAP system Faulty vent o-ring seal Defective vent valve Defective purge valve Defective leak detection pump

Read more at: http://www.obd-codes.com/p0442

Posted on Oct 16, 2013

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Posted on Jan 02, 2017

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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

Posted on Dec 15, 2008

  • 67 Answers

SOURCE: 1990 ford ranger 2.3L running rough at idle and while driving

Hi check all the fuse. fi the fuse are ok . remove the coil pack and reverce if the cly missifire change replace the coil if not chage replace the electronic comtrol module ok.

Posted on Apr 20, 2009

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2001 chevy cavalier code po303 how to fix it replaced the spark plugs how to fix it it has a rough idle, weak acceleration ce light starts flashing on acceleration and hard to start


change the ignition coil pack common problem p0303 means cylinder 3 misfire and the coil pack are know to go out on these particular models

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DTC P0303: Cylinder 3 Misfire Detected
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It's common for ignition coils to go on these vehicles. If you have a spark tester (auto parts store) install it on your #3 plug wire and check for a strong spark. By swapping the wire you obviously eliminated it as a possibility. There's always a chance that you have a compression problem or ad injector problem but chances are it's just a bad ignition coil. Mark the wires then remove them. You can remove the coil without accessing major components but it will be tight. Disconnect the connector and remove the bolts.

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TRY and idle your car up alittle to see if problem goes away if not then look into replacing your catolitic convertor.

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2001 v6 escape rough idle when cold


To update my earlier repair on the 2001 6 cyl Escape: When cold, and when the ignition was turned over but no accelerator pressure given, the rough idle finally returned the P0303 code again when the check engine light came on indicating that it wasn't caused by the plugs or the coil. FYI, I had replaced the intake manifold gaskets during the original repair and just prior to that I had replaced the fuel filter which was very dirty (I cut it open to see).

The repair manual referred to fuel injectors as a possible problem. I have run three tanks of fuel using different injector cleaning products and am very pleased with the results. Cold starts are much smoother and I am unable to coax out the P0303 code or any other code.

My opinion, change the fuel filter, use a fuel injector cleaner for a couple of tanks, change the plugs if the problem still exists. The coils were not the problem on my vehicle.

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