Question about 1998 Toyota Corolla

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Car is running real rough like when you get bad gas. Code reader says cylinder 1, 2 misfire detector

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I would start with a tune up and a new fuel filter then come back if that does not fix the problem

Posted on May 27, 2010

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Posted on Jan 02, 2017

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Misfiring cylinder 3 and ignition valve


Have the Codes checked! IPD has a Code Reader for less than $80 just search IPDVolvo or ipdusa

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What cylinder is the # 1 cylinder on a 1998 volvo 5 cylinder


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I have a 2000 Hyundai Sonata that runs rough when you start it up. I hooked a code reader to it and it said that system was lean on bank 1 and multi misfire and not reading 02 sensor on bank one. I have...


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Dec 14, 2010 | Hyundai Motor 2004 Sonata

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Engine light on... the engine gets bad gas mileage and runs very rough at idol... troubleshooting code P0301. Autozone says: misfire, fault sparkplugs, wires, and more... CAN YOU HELP?


Cylinder #1 Misfire.
What experience you have, and how you approach this, is up to you.

Plugs don't fail
You don't throw wires at these things
You Diagnose the cause and repair.

If you got COP Ign Coils --go there for #1

Oct 12, 2010 | 2004 Dodge Ram 1500

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Cylinder 1 misfire


First step is to check the plugs; hearing a lot online about this being a fuel injector problem. You can try injector cleaner, check the plugs and wires (clear the code) and see if this clears your problem.
If not, it's likely fuel injector(s) is bad.

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5.3 L Missing and Rough Idle Intermittently


i have a 2001 chevy z-71 5.3L. I keep getting a random/multiple misfire code for cylinder 1 . I have replaced plugs, wires, coil pack(only on #1 cylinder)., and fuel pump. I still keep getting the cylinder 1 misfire code. I put truck on a scanner and watched the cylinders. # 1 misfires at idle but quickly stops misfiring at around 1000 rpms. you can here the engine miss at idle but truck runs great on road . anyone else ever had this problem?

May 05, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

Engine light comes on - Code shows P0300 and then


OBD II 300 Random/Multiple Cylinder Misfire Detected

When the misfire monitor detects a misfire, it will trigger the check engine light with the specific cylinder number as the last digit in the P030X code. For instance cylinder 1 misfire is P0301, cylinder 2 is P0302 etc. In this case we have either multiple cylinders misfiring, or the computer simply can't determine the specific cylinder, and as such we are left with the P0300 in computer memory.

Possible Causes:

Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

Apr 04, 2009 | 1996 Dodge Ram 1500 Club Cab

2 Answers

Very Rough running engine


I think the auto-lite plugs are probably your problem. yes it sounds like mis-firing. That's one of the few times the check engine light flashes. I'd suggest changing the plugs to a NGK plug, that's the ONLY plug we use in our Audi's and VW's (work at a VW/Audi shop). Try that, and it should take care of the rough running, if not, it will probably need coils too.

Jan 13, 2009 | 2004 Audi TT

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