Question about Toyota Corolla

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2000 toyota Corolla CE 4cyl auto

My corolla has a dead misfire on two cylinders after 40-55mph .. I changed the coil over boots but only two of them and had mechanic reset the check engine light and it ran fine til I went to put a full tank gas in it and it started doing this misfiring and running like junk and the check engine light started flashing again

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Howdie Sounds Like You Need To Go Out And By Some !! NEW Ones And Put them On And Away YA Go that will solve your Big Problem And Hope YA Did Not Wreck the Coils By Doing What Ya Did Yhen It Get,s to being More CASH Down The Drain Thanks For Your time Hope All Goes Well Let ME Know How Ya MAde Out With This Ok

Posted on Mar 04, 2015

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The light is flashing because you are having an active misfire occuring. replace all boots and springs.

Posted on Feb 17, 2014

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Posted on Jan 02, 2017

SOURCE: 1999 pontiac grand prix . will not run

If wiggling the wires cured the code, then one of the wires is broken inside the insulation. Pull on each wire one at a time. look for the colored insulation to stretch, this will be the broken wire. For the other car that wont rev up, this is a common when the catalytic concverter is plugged up. This will also cause MAF codes, and in turn, TRAC OFF light.
See http://www.greatautohelp.com

Posted on Oct 17, 2008

  • 12 Answers

SOURCE: 2000 toyota tundra #5 cylinder misfire

i think #5 is on driver side the front one....

Posted on Dec 30, 2008

Molson02536
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SOURCE: Check engine light

A multi misfire may mean that one or more of the following has happened:
Faulty spark plug or wires, Faulty coil (pack), Faulty oxygen sensor(s), Faulty fuel injector(s), Stuck/blocked EGR valve / passages, Faulty camshaft position sensor, Defective computer.

The engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wire, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the the problems were faulty fuel injectors. 

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Good luck and hope this information helps, keep me posted, be glad to help you get the truck running 100% again. Not sure if your running a K&N air filter, and if you are there may be a flim of oil on the MAF sensor that is making you run lean. You may want to spray down the MAF sensor with a can of MAF cleaner. 

Posted on Jul 02, 2009

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