Question about 2004 Chevrolet S-10

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My 2000 Chevrolet S10 ZR2, 147,000mile is miss firing and hesitating. Comes up with codes P0301, #1 cyclinder misfire and p0453. I took my truck to Chevy garage and they did a compression test, came back ok(120psi)in all cylinders. Had cyclinder leak down test proformed, 100% leak. I took the heads off when i did #1 push rod had some carbon build up. Had them sent to a machine shop, they were pressure tested and decked. They said heads were fine. I have replaced, Distributer and module,Distributer cap, Rotor button, Plugs & wires, Fuel injector assemlby/spider, fuel filter, air filter, egr valve, map sensor, airpump check valve, most vacume hoses,gaskets from the head up, and checked the timing chain. Do you have any idea's about what my problem is? Thanks

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I have done a full engine replacement on these, a zr2 to be exact. I have found that a p0300 (multiple misfire) usually points the the Piece of **** injection spider, then I had a p0301 as well after replacing that with the multiport unit upgrade and found that the spark plug electrode folded over shorting to the center conductor.

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Posted on Sep 20, 2009

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Check the spark wire for the #1 plug. I had one get burned by the header, I would check it for burns or cuts. Sorry I couldnt help more.

Posted on Aug 18, 2009

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1 Answer

Engine is miss firing


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Multiple cylinder misfire


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1 Answer

MY TRUCK IS RUNNING ROUGH AND HESITATING WHEN APPLYING GAS WHATS THE PROBLEM ITS A 1998 FORD EXPEDITION


With a scanner connected to the car it may have codes to help you find the correct problem. like P0300 is readom cylinder missfire ( this means that many cyclinders miss and can be a vacume leak to low fuel pressure to EGR valve hanging open) P0301 -P0308 can be any number of these cyclinders misfiring as the cyclinders are numbered( The boots on the coils going over the spark plugs fail or get oil or water or even antifreeze in them and they miss. To pull the coils you need to pull the injector rail and if your not a regulr mechainc you sould hire this work done as the things you can break the a regular mechanic won't, May save you more than what the pro is going to charge.

Jun 24, 2011 | 1998 Ford Expedition

1 Answer

My 2000 grand am has multiple miss fires


P0300 Diagnostic Code - Random/Multiple Cylinder Misfire Detected

Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.

A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

Symptoms may include:
* the engine may be harder to start
* the engine may stumble / stumble, and/or hesitate
* other symptoms may also be present

Causes: A code P0300 may mean that one or more of the following has happened:
* Faulty spark plugs or wires
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector(s)
* Burned exhaust valve
* Faulty catalytic converter(s)
* Stuck/blocked EGR valve / passages
* Faulty camshaft position sensor
* 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.

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.


Hope helps, and keep us updated.

Jan 05, 2011 | 2000 Pontiac Grand Am GT

2 Answers

I have a 2002 v6 mustang. I installed a used 2002 v6 engine 3 weeks ago because my spark plug threads tore on my original. NOW i have 4 cyclinders misfireing, tranny shifts late or after i let off the...


its a well known cause that if the motor is running really bad the tranny will **** or act bad your gonna have to find the problem with the miss firing cyclinders and fix it doing this make fix your tranny problems you can clear most computer codes by unhooking the battery for about 10 min and then start it and see if the engine light comes back on that will give you a new set of codes you will have to have them read and fix what they are.

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1 Answer

Recently took my 2000 s-type jaguar 4.0 to Advanced Auto to run disgonostic for jumping and hesitation the code came up P0308 & P0304? Cylinder misfire what exactly is that? and what needs to be...


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My engine light stays on, I had my care worked on about 3 wks ago and the light never came on now it's on. Took it to Auto Zone and it reads cyclinder misfiring??? What's up with that?? They replace the...


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2 Answers

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Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.
A P0300 OBD DTC code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why. 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. 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.


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