Question about 1998 GMC Envoy

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My car cylinder is miss firing (cylinder#2) and has failed inspection and the re-test as well, problem seem to be code # P0302 how much would this problem cost me to solve? any help is appreciated.

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  • mieleman Aug 27, 2015

    This is usually caused by a bad ignition coil pack. Each cylinder has its own coil. Just swap it with another, clear the code, and go for a drive. If you swap it with cylinder three, a bad coil pack should return a code of P0303 after a few minutes. If so, you have your answer. Just pick one up at the store or get one online and you're all set. I wouldn't drive that way too long. Unburned fuel is entering the exhaust system and could ruin the catalytic converter.

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There are several things that could be causing this problem, from a bad spark plug, igntion wires, distrubtor cap, injection , no compression in that cylinder. Try the simple things first = plugs, wires, cap etc. a bad note: these are known to have the injector "poppets" fail with no warning. Go there when all else fails. good luck.

Posted on Dec 29, 2010

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I have a 97 Dodge Ram 1500 with a 5/9 in it I put plug wires on it and now it's popping and it lost power and it had a code po302 and Po 307


The P0302 code means that the cylinder 2 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 2. If the problem persist more tests needs to be done. PO307 is the same thing except number 7 cylinder. Possible symptoms - Engine Light ON (or Service Engine Soon Warning Light)
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Why won't my car start?


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Apr 25, 2015 | Cars & Trucks

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Error Code P0302 1996 Volvo 850 GLT


Diagnostic Test Code (DTC) P0302 has a generic description of "Cylinder Misfire - Cylinder Number 2".

A misfire simply means that when it came time for that cylinder to fire, it missed its chance.
There are many things that can cause a misfire. Some of the things are listed below. Diagnostics should be performed to eliminate the possible causes so you don't spend a lot of money replacing parts trying to "guess" what is causing it.

These are just SOME of the possible causes:

> Spark plugs
> Ignition cables
> Ignition coil
> Distributor cap (if equipped)
> Fuel injector
> Fuel injector circuits
> Burned engine valves
> Blown head gasket
> Cracked cylinder head
> Piston damage
> Cylinder block damage
> Broken valve springs
> Damaged camshaft
> Vacuum leaks

Sep 10, 2011 | 1996 Volvo 850

1 Answer

Missing,viborating


Misfire could be a number of things:
a) spark plugs - change them if used over 15K miles - inspect/regap.
b) spark plug wires - change them if over 15K miles - inspect
c) ECM (electronic control module) - test with HEI (high energy ignition) tester.

The vibrating tells me that the engine is running on less than its normal compliment of cylinders - the shaking is produced by the imbalance caused in the engine by one (or more) cylinder(s)
not firing at all.

The "Check Engine" light probably is coming on due the the misfire condition. Go to Pep Boys or
Advance Auto Pats, where they'll tell you (free) your codes causing the "Check Engine' light to be
lit - the code coming from your truck's computer will probably be one or more of:
P0300 - Random/Multiple Cylinder misfire detected
P0301 - Cylinder 1 misfire detected
P0302 - Cylinder 2 misfire detected
P0303 - Cylinder 3 misfire detected
P0304 - Cylinder 4 misfire detected
P0305 - Cylinder 5 misfire detected
P0306 - Cylinder 6 misfire detected
P0307 - Cylinder 7 misfire detected
P0308 - Cylinder 8 misfire detected
P0313 - Misfire detected with low fuel

Jun 23, 2011 | 2009 Ford F-150

1 Answer

Vehicle missing,shaking,engine light comes on


Misfire could be a number of things:
a) spark plugs - change them if used over 15K miles - inspect/regap.
b) spark plug wires - change them if over 15K miles - inspect
c) ECM (electronic control module) - test with HEI (high energy ignition) tester.

The shaking tells me that the engine is running on less than its normal compliment of cylinders - the shaking is produced by the imbalance caused in the engine by one (or more) cylinder(s)
not firing at all.

The "Check Engine" light probably is coming on due the the misfire condition. Go to Pep Boys or
Advance Auto Pats, where they'll tell you (free) your codes causing the "Check Engine' light to be
lit - the code coming from your truck's computer will probably be one or more of:
P0300 - Random/Multiple Cylinder misfire detected
P0301 - Cylinder 1 misfire detected
P0302 - Cylinder 2 misfire detected
P0303 - Cylinder 3 misfire detected
P0304 - Cylinder 4 misfire detected
P0305 - Cylinder 5 misfire detected
P0306 - Cylinder 6 misfire detected
P0307 - Cylinder 7 misfire detected
P0308 - Cylinder 8 misfire detected
P0313 - Misfire detected with low fuel

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1 Answer

I had this code PO300, P0302, and p0301. I changed my spark plugs but engine wont't start.I'll like also to know the probable causes of misfiring too,please.


300 is multiple cylinders miss fire, 301, 302 you have cylinder 1 and 2 miss fire. check your wires and fuel injectors on those cylinder

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3 Answers

Where is #2 cylinder on 2000 jaguar s type 4.0?And what is code p0302


I recently starting having this problem also (only code p0305/308). That code means "miss-fire" on #2 cylinder. The #2 cylinder is the nearest cylinder on the right (closest to front of car on drivers side) if you are standing in the front of the car.

Jul 12, 2009 | 2000 Jaguar S-Type

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