Question about 2003 Chevrolet Trailblazer Ext

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I changed the plugs and wires on my 2003 trailblazer. I gapped the spark plugs @ .040 and checked all of the connections. Now my engine skips. It gave a 0300 code ( multiple cylinder misfire). Any suggestion where to start. How can I tell which cylinder is misfiring

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If its a multiple missfire then i would suspect your fuel pressure is dropping or your regulator has failed and is sucking too much fuel causing the computer to overcompensate, these engines are also known for intake leaks

Posted on Mar 28, 2011

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Did you replace plug wires also?Only other thing i can think of is the coil, or distribotor cap. Good luck.

Posted on Mar 28, 2011

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My 1999 jeep grand cherokee skips after changing the coil and spark plug,what could be the problem


get plug wire tester at parts store and test plug and coil wires if there bad change them to also did you check plug gap?

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My 2003 cadillac is skipping


ENGINE MISSING COULD BE FAULTY FAULTY SPARK PLUGS + WIRES. SPARK PLUGS HAS THE WRONG GAP.YOU COULD HAVE STOPPED UP FUEL FILTER.CLOGGED FUEL INJECTORS.

Jul 29, 2011 | 2003 Cadillac Deville

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How do i change spark plugs


  1. Expect spark-plug work to be tedious. If this is your first time, plan 3 or 4 hours after engine cools (or 1 hour on several days), allowing 15 minutes per plug. It is harder than changing air filters, fixing flat tires, or starting a mower.
  2. Consult your vehicle's manual. Look up where your spark plugs are, how many you have, the correct "gap", and the size socket needed to remove them. Also write down the vehicle's make, model, and year. The gap can also be found on the emissions label under the hood.
  3. Visit your local auto parts store. Find (either by looking up in the provided reference book or by asking an employee) the correct spark plugs for your vehicle. The store also has socket wrenches, plus spark-plug sockets (with gasket), and socket-extension rods or swivel-joints to reach recessed plugs.
  4. Find out (from the reference book, the packaging, or the employee) if these spark plugs need to be "gapped". Some modern plugs should not be gapped (but others can have different gaps, depending on use in either 6-cylinder or V-8 engines, etc.).
  5. Park vehicle, turn off the engine, and open the engine compartment, to cool for hours. (WARNING: After running a car for a long time, the spark plugs can be the hottest part of engine! While it can require several hours to cool enough, it can require several weeks to heal burnt skin.) Especially with aluminum-head engines, let cool to room temperature to reduce the probability of damaging the threads.
  6. Take (if needed) a wire-gauge spark plug gap tool and adjust the distance between the two electrodes. Between the electrodes is where a spark is made. One electrode will be an L-shaped piece of metal (hook), the other a metal prong centered directly across from it. Set the gap between the two electrodes, from .028-.060 inch, such as .035/.040 /.043 /.050, as in book (see Tips below).
  7. Collect tools & new plugs (perhaps in a tool-tray). Remember which direction the socket-wrench switches to reverse/unscrew: wrench might not be visible when working back plugs.
  8. Check fit of new plugs inside wrench-socket gasket. If new plugs stick to rubber gasket, consider removing gasket with screwdriver in square hole, to just use tape. Like taping screws to a screwdriver, the socket can be taped to spark plugs (not the threads) with scotch tape, for easy release once inside the engine. Otherwise, have pliers to pry the socket off new plugs once installed.
  9. Locate (with the help of your manual or a repair manual for your vehicle) the distributor spark-plug cables/wires. The number of wires will be equal to the number of spark plugs your engine has. Often these wires are red or black, and will be equally divided on opposite sides of the engine.
  10. Using masking tape, mark each of these wires for where they connect. Don't rely on memory: if interrupted, easy to forget, and engine can run rough with crossed plug wires. For 8 cylinders, deducing plug connections is almost impossible (120 choices for 5 wires) -- in that case you must contact an expert or study wiring guides.
  11. Remove each spark-plug cable, pulling the caps (to avoid breaking cable wires). Caps should come loose by very intense twisting/pulling (avoid jerking/hitting fingers).
  12. Using compressed air, pressurized engine cleaner, or a brush, clean all debris from around the plug.
  13. Using a spark-plug socket, remove each plug from the engine, and replace each with a new spark plug. Don't over tighten (usually just 1/16 turn, after finger-tight).
  14. Replace the spark-plug cables on the same plugs they originally came from, and remove the masking tape.
  15. Remove tools near engine (beware the moving belts), close your engine compartment, and start your vehicle.
I hope this helps.

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Hello, here is the spark plug gap for this vehicle.

Spark Plug Gap: 2.2L Engine LN2 0.00157mm.(.040 in.)
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Hi my friends Trailblazer won't start. We have ruled out the battery the starter the cylanioid and battery connections. Any ideas?


Now you need to check for spark. Pull a plug wire, and insert a loose plug in the disconnected wire. Crank the engine to see whether there is spark across that gap.

If there is, reconnect the plug wire, take the hoses or whatever off where the air goes in the engine (I am presuming this is fuel injected), and spray starter fluid in the throat, and see if the engine will show signs of life. If it does, you have a fuel problem.

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4 Answers

New Spark plugs


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plugs located on the cylinder head look for 4 large round wires on front side of engine.plugs are connect to wires. plug gaps is .040 for the 2.5 engine .041 for the 2.0 engine.

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2 Answers

Spark plugs


on top center of the engine. You would have to remove the intake hose. There is 6 COPs or Coil over plugs mounted on top of the sparkplugs. Remove those and the sparkplugs are accessable. Hopefully this helps

Jan 17, 2009 | 2003 Chevrolet TrailBlazer

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