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Po302 code comes on my 2002 chevy tahoe

Have code po302 coming on my chevy tahoe tryed changing spark plug, fuel injector, swaping coil and still continues to come on also check compression and it read good what could be the problem????

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  • Cars & Trucks Master
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The code means the computer has detected a drop in RPM for cylinder number 2. If you know compression is good, it has to be spark or fuel.
Have you checked for power and signal for the injector with a low voltage test light ? Do you know for a fact the coil is firing on that cylinder ?

Posted on Jul 16, 2013

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Posted on Jan 02, 2017

HellPoolHall
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SOURCE: missing on one cylinder

Replace the coil going to that cylinder, and then replace the valve cover gasket to prevent further oil from getting on the new coil. If it is not the coil, the crank sensor could have gone bad in it.

Posted on Aug 05, 2008

ButtFuzz
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Does this motor have the equivalent of crank-trigger ignition? If so, is the sensor A-OK?

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SOURCE: 96 ford explorer code p0301 mis fire 1

Sounds like either a bad plug wire, or coil pack. This is about all that would cause the misfire.

Posted on Apr 17, 2009

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SOURCE: Chevy truck '02 surges between 45 and 55 mph

you should change the tps( throtal position sensor) this can cause that problem

Posted on Aug 15, 2009

flbergeron68
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SOURCE: 2000 montana 3400 engine,code p302 number 2

ignition control module, throttle position sensor and other sensors need to be tested to establish problem, any codes from OBDII ? check engine light staying on ?

Posted on Jul 04, 2010

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2 Answers

P0302 - Cylinder 2 Misfire Detected,what needs to be done.


Fritz, Clear codes, Plugs and coils try switching them around, not using the same cylinder, to see if code changes to different cylinder. this would help diagnose bad coil or plug. See links below for full instruction. I have had this code come up because of a bad/dirty fuel injector also. Last link tells what other reasons code could be thrown.
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Po302, 1999 Jeep Cherokee #2 cylinder misfire


Try checking fuel injector.
Try checking compression.
Is the engine running ok, maybe you're getting a bad code, if so you need to find out how to clear it, sorry I can't help you with that. Good luck

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CODE PO302 MISSFIRE 99AUDI A4TURBO WAGON SWAPPED COILS REPLCED PLUGS


IF YOU REPLACE SPARK PLUGS AND COILS.COULD HAVE DIRTY CLOGGED FUEL INJECTOR OR INTAKE LEAK AT CYLINDER 2 OR FAULT AT ECM. THE ECM CONTROL CIRCUIT NOT DRIVING THE FUEL INJECTOR.OR FUEL INJECTOR WIRING IN CONNECTOR COULD BE LOOSE OR DAMAGED.

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Po302 only runs rough at idle.can't find any external vacuum leaks.eliminated any ignition or fuel delivery issues.has good compression and engine has only 38k from jasper.have you seen or heard of...


P0302 is a misfire detected in cylinder #2. this can be caused by a bad spark plug, plug wire/Coil pack, or faulty injector. I would go back and switch the #2 injector with one on the other side and then clear the code. See it it comes back on the cylinder that you put the #2 injector in. If so then the injector is faulty..If not then the spark plug or wire/coil pack to it is probably bad. Rare case it could be a sticky valve.

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My Navigator 2004 has code PO302, who can i fix this problem?


A code P0302 may mean that one or more of the following has happened:
* Faulty spark plug or wire
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector
* Burned exhaust valve
* Faulty catalytic converter(s)
* Running out of fuel
* Poor compression
* Defective computer

Possible Solutions:
* If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
* If there are symptoms such as 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 wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Keep us updated (remember to rate this answer).

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EACH ONE OF THE SPARK PLUGS IS LOCATED UNDER INDIVIDUAL COILS. YOU MUST FIRST REMOVE THE BOLT ON TOP OF THE COIL AND GENTLY TWIST AND PULL UP ON THE COIL WITHOUT RIPPING THE BOOT. UNPLUGGING THE ELECTRICAL CONNECTOR IS NECESSARY ON MOST MODELS. SOME OF THE NEWER MOTORS HAVE A COVER ON THE TOP OF THE ENGINE THAT HIDES THE COILS. PLEASE KEEP ME POSTED. THANKS FOR USING FIX-YA. BEST OF LUCK

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Engine stalling on a 2002 chevy tahoe z71


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