Trailblazer misfire no code. It happened to be the first thing that I checked, and the new part fixed the car inst If you're experiencing a cylinder misfire in your Chevy trailblazer or most any other makes and models for that mater then you need to read on! In this video 05 @145,000- Came into the old idle misfire with no code. 3L, 5. (2002 Trailblazer 140,000 miles) I changed all the plugs first (they were still the factory plugs) Then still had the same code. Mar 20, 2022 · A forum community dedicated to Chevy Trailblazer and GMC Envoy owners and enthusiasts. I still need help figuring out how to solve the P0128 and P0171 codes. It is only misfiring on #1. Cleaned the MAF as well. 2 L6. P0300 is often accompanied by cylinder-specific misfire codes (P030X, where the X indicates the cylinder number that is misfiring). but it also had po303. Except a week ago the SES light came on and my OBD scanner told me it´s a P0305. to/3Dw57Bamore Finding a misfire on the 4200 gmc or trailblazer motor Car just started running really Rough when I was driving it. Since this happened, I have been getting some intermittent Bank 2 Lean Codes. Random Misfire Tests. Fuel pressure at idle fluctuates rapidly between 58 and 65, smoths out at higher RPM. 42 10 bolt posi (Buick), - All your base are belong to us. Fixed it no more code. They can provide valuable insight as to what the problem may be and help you narrow down Narrow down the symptoms and solutions to fix your engine issues If your OBD-2 scanner has pulled up a cylinder 3 misfire error and you see the P0303 code, it 03 Trailblazer. iv replaced spark plugs My trailblazer started with the spitting and sputtering (misfiring) last week. If it wasn’t the problem, it can’t hurt to change them. The vehicle may produce excess vibration, especially at lower RPM. If your check engine light is on, get a code scanner and see what trouble codes are stored in the PCM (powertrain control module). We go through the causes, symptoms for trouble code P0306 and how to fix this problem. 8K subscribers I have a 2003 chevy trailblazer it has a po300 code multiple misfire. Multiple Your Trailblazer will run rougher at any RPM, but a misfire will be most pronounced at idle. I do not know where else to look for this issue. Have you checked the oxygen sensor values yet? The 2005 Chevrolet Trailblazer has 6 problems reported for misfire. Still get same code and it still runs P0307 is a fairly common trouble code with the Chevy Trailblazer. The first thing I did was replace the motor mounts because it had a horrible vibration at idle, and that solved that issue. When there are no codes, but there is a misfire that would typically trigger a code, use your vehicle information database to determine what the enabling criteria for setting a code is. If it's bad enough to cause your Trailblazer's check engine light to come on, you shouldn't drive your vehicle at You would probably still get a check engine light on because of no pressure, but it would relate to a emissions code. No more DTC's but still a slight misfire. No change: swapping them, manually disconnecting the wire plugs, reading the code 0301, all Now here is the kicker. 2l that has a rough idle / randomly missing at idle. Today, I started getting P0300 random misfire codes. Idles smoothly TRAILBLAZER Ignition Coil Replacement - CYLINDER MISFIRE CODES - DIAGNOSE & REPAIR GearHeads with FinallyHeSleeps 37. At least there was no charge for that "service". 1971 Malibu, factory buckets/full gauges/console, 383 roller cammed small block, Turbo 400, 3. I have an 03 Trailblazer LS with 107,000 miles on it and yesterday one of the cylinders starts misfiring (blinking "Service engine soon" light). The only thing reads as pending codes multiple misfires but no code to explain this. So I upgraded to MSD Coils, MSD wires and new E3 spark plugs but code keeps coming back! Can someone please help me!?? Should I put everything back to stock and take it to the dealers? PLEASE MESSAGE ME ASAP! 4. Since I am5k from spark plug change, replaced them with the AC Delcos. P0302 is a real drivability concern and should be dealt with right away. 7L. The vibration became worse over time. Ok, guys here is my situation. 0L and 5. It said cyl. I have owned the vehicle since February. P0300 is a generic OBDII code that can occur with the Chevy Trailblazer. Feb 2, 2023 · Get the o2 sensor issue fixed and see what happens. :bonk::bonk:I have a 2002 trailblazer Ext LT 4x4 with the vortec 4200 I6 L6 motor. Replaced the fuel pressure regulater due to leakage on the old one, cleaned the throttle I have an 08' TBSS and I am getting a p300 code, multiple cylinder misfires. still misfire on #1 Only Pulled and replaced #1 Plug, checked gap, made sure it was at runs rough but no codes - An answer to a similar question and it said to look for something that would mimic a misfire i. If your Chevy Trailblazer has the P0303 trouble code, you should know that it's about as common of a code as there is. After making those changes and clearing the codes, I took it for a test drive, but it felt about the same. What: Rough idle, random misfire at times causing the exhaust to pop. I found my headers cracked at the collectors about a week ago. I then changed the cold for that cyl. The P0300 code means that a cylinder (s) is misfiring or is randomly misfiring. . It could also be an O2 sensor going bad and forcing the engine to run lean and misfire. Over 100,000 miles on it, ya, in need of a tune up. Feels somewhat more responsive (peppier). to/465UWj7 An engine misfire is when a cylinder has an incomplete combustion ignition or the absence of Have a bit of a weird issue I'm chasing down, and I have done some searching on the boards, but only ended up more confused. It's and OBD2 code and stands for: P0306 is certainly a cause for concern, and should be considered a threat to the drivability your Trailblazer. Code P0300 2002 Chevrolet Trailblazer Description The P0300 diagnostic trouble code (DTC) for a 2002 Chevrolet Trailblazer indicates that a random misfire has been detected in one or more cylinders of the engine. Started noticing a slight vibration at idle around 150k miles. I quickly noticed the somewhat rough idling. The truck struggles to idle properly and there is obvious hesitation during acceleration. In this comprehensive guide, we will discuss the various causes of engine misfires, the signs and symptoms of misfires, and how to diagnose and fix an engine misfire without a trouble code. My exhaust freaking reeks, not like sulfur (rotten eggs) but of a somewhat fuel-ish smell, and my MPGs have gone from a combined 17. Changed the plugs last weekend and now I have a P0300 misfire. I had a code P0301, so I replaced the spark plugs and the coil on cylinder #1, thinking it would be efficient to do both at once since I was short on time. 2 LT. The nice thing about P0306 is that it's a cylinder specific trouble code, which makes diagnosing the problems much Testing a Misfire Code (P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308) on GM 4. It depends on how serious the misfire is. 2, it has roughly 82. Occasionally at highway speeds, I've had one a random misfire, no codes and no flashing engine light. The vehicle itself may begin to run rough. Runs great out on the road, but can feel the miss at idle. I thought this would be normal due to the cracks. Is it now safe to assume that the coil from cylinder 1 that is now on cylinder 3 is faulty? And yet another question is Oops! We ran into some problems. Still there. Here I have a Chevy Trailblazer with a P0302 - cylinder #2 misfire. #2 cylinder is still not firing, however when I had the intake manifold off I noticed the #2 intake port was wet. My misfire is back also but only randomly at idle. Average repair cost is $1,280 at 89,550 miles. In a nutshell: Vehicle: '05 Envoy (LL8) with 200,800 km (125,500 mi) on the clock. It is misfiring but there is no check engi Trailblazer P0301 OBDII Code Symptoms Here are the most common symptoms of P0301 in the Chevy Trailblazer. I show you the basic troubleshooting steps that you can do that only require a code reader and a few hand tools. Things I have tried so far: swapped wires from #1 to #3. If your Chevy Trailblazer won't accelerate, that is a serious cause for concern. Sometimes runs fine, sometime runs rough, stalls and throws codes usually misfire detected #2 cylinder, but sometimes random misfire detected. Truck’s SES light did not come on, but truck was running pretty crappy, more when it was cold than hot, but definetely a loss of My check engine light just came on with a P0300 code (random/multiple cylinder misfire detected). Replaced the plugs with OEM AC Delcos, new fuel fitler, and cleaned the throttle body. still misfire on #1 Only Swapped coils from #1 to #3. This code indicates that your vehicle's engine is misfiring and can be a drivability threat. Troubleshooting Code P0304 Misfire Detected Cylinder #4 Chevy Trailblazer 2002-2009 | Video 1 of 2 Axle's Garage 28. Now the misfires can be felt randomly at idle In this video, I diagnose a misfire on my mailman's Chevy Trailblazer. I cleaned the MAF with no luck, then replaced it ($300) with no luck, then had a misfire form, so I replaced all 4 spark plugs and coil packs (~$250) which fixed the misfire, but not the P0171. Changed plug and coil around with another cylinder, but the code stays with #4 cylinder. It all started with a cylinder #1 misfire, after fiddling with spare coil packs and new spark plugs I've had enough of it and I bought a new coil pack. This seems to start after it's been running for about 5 the code stands for Random/Multiple Misfire, so it may be more than one cylinder thats misfiring. It indicates that your vehicle’s second cylinder has a misfire. If No existing codes were found, but the scan did show that many of the monitors were not complete, indicating the codes had probably been cleared recently. I have another great one for you guys out there! 2005 Trailblazer 4. This occurs when not enough fuel is burned in the engine or the spark plug is damaged. 2L;DOHC and I put gas in it the other day and afterwards it started misfiring out of nowhere with the (SES) light flashing then went solid. When a coil pack failed on my '03, the MIL lit up and it did set a misfire code, which O'Reillys mis-read because their scan tool is a piece of crap that can't display specific-cylinder misfire codes, so it lies and says it's P0300 "Random" misfire. Come join the discussion about performance, modifications, troubleshooting, towing capacity, maintenance, and more! Hey. Where is the MAP sensor and how do you clean that? P0302 in the Chevy Trailblazer is a common OBD II trouble code. The fuel pump in the gas tank is what builds up fuel pressure in the lines that run to the fuel injectors. Have replaced the plug, coil and boot, and the #4 fuel injector. 9 Leading me Next I noticed that P0300 for misfire was caused from the hose that connects under the intake manifold was left off after having the spark plugs replaced. It's and OBD2 code and means that a misfire has been detected in the 7th cylinder in the firing order. When looking at the code reader for a new code I get test past, NO codes. | WeldingWeb - Welding Community for pros and enthusiasts Home Forums Hey guys, I recently bought a `03 Trailblazer 4. Recently (over the last 2 weeks) the service engine light has been coming on with more frequency, first blinking (means emissions problem according to manual and then it will stay on solid (meaning a misfire Codes show a Cylinder #4 misfire. The P0301 trouble code will trigger your Trailblazer’s check engine light. A forum community dedicated to Chevy Trailblazer and GMC Envoy owners and enthusiasts. Rough Idle Tests. Nov 8, 2009 · You could try jump the coil pack around to see if you can get a more specific code since you already ruled out the throttle body. Here's a curiosity for y'all. The only codes are PO300 (multiple cylinder misfire) and PO128 (most likely a thermostat stuck open). Before you can even diagnose P0304 in your vehicle, you need to find the fourth cylinder’s location. #6 missfire. 2L engine, about 78,000 miles. Performed the normal Throttle Body cleaning like I’ve done in the past for the issue. So for obvious reasons new spark plugs seemed to be the logical choice. 6 to a combined 15. Jul 1, 2025 · I have a 2003 Chevy Trailblazer with a L6,4. Customer: Hi, I am working on a 2003 Chevy Trailblazer 4. I'm stumped on what to look for next, I even had the dealer look at it they are not sure either. 2 engine. Knowing this information affected my approac I had the code scanned and it was P0171 - Lean on Bank 1, and I'm hoping this code is the same for our TVs, or else my experience is pointless. If you have P0300 and a cylinder-specific misfire, spark plugs an coils for these platforms I have the i6 an I wanna get getter gas mileage aswell if possible any real advice is appreciated 2 reactions · 19 comments 󱎖 Ford Expedition 3. So I began the troubleshooting process by installing This owner of this truck installed a new plug and coil on the #6 cylinder and still continued to have a misfire. Fresh owner of 05 Trailblazer, 4. motor mounts, although it fee P0305 is a fairly common trouble code with the Chevy Trailblazer. Aug 7, 2022 · This article addresses the possible causes of your engine misfire in your Chevy and points to the symptoms that will help you diagnose the issue. It's and OBD2 code and stands for: P0305: Misfire Detected → Cylinder 5 P0305 is certainly a cause for concern, and should be considered a threat to the drivability your Trailblazer. Start by checking for intake leaks; intake gaskets are a common cause of multi-cylinder misfiring. Come join the discussion about performance, modifications, troubleshooting, towing capacity, maintenance, and more! Nov 20, 2011 · No codes are showing for misfire, New plugs, cleaned throttle body and checked it for any vac leaks. I initially had a P0301 code, then after switching the ignition coil from cylinder 1 with the coil from cylinder 3, I get P0300 "Random/Multiple Cylinder Misfire Detected". Any help where to go next? How to troubleshoot and fix a Chevrolet P0300 engine code: Engine Misfire Detected Amazon Link to Spark Test Tool: https://amzn. The only thing I've done recently was my converter install about a month and a half ago. It's a generic code (same meaning for all vehicles) that indicates that your vehicle’s third cylinder is misfiring. But They owe you a refund. That's the most obvious issue at this point. Now, it shows a Rough Idle/misfire not showing and codes [SOLVED] codes idle misfire rough scanner Jump to Latest 27K views 22 replies 10 participants last post by Devlin82 Apr 9, 2011 Misfire no codes - So I have a 2004 Chevy trail blazer 4. 000 miles on it and is in very good condition. Replaced plugs, #2 coil, cleaned Car Code p0306 is a check engine light with a misfire code. How to fix a Chevy/GMC P0301 engine code: Cylinder 1 Misfire DetectedA P0301 code is set when the computer (ECM/PCM) reads several misfires have occurred in P0306 is a fairly common trouble code with the Chevy Trailblazer. I used my The P0300 engine code in the Trailblzer relates to a cylinder misfiring issue. P0303 is a real drivability concern and should be dealt with right away. e. On “V” configuration engines, it’ll usually be the second cylinder on the head further away from the front of the engine. 5L V6 misfire codes p0302 and p0306 Jordan Dougherty Ford Ecoboost Engine Problems and Fixes Sponsored by Pumaspeed 2y · Public P0304 is a cylinder-specific misfire code, meaning only your Trailblazer’s fourth cylinder has a misfire. I got code P0302 and replaced the # 2 coil. Test each coil pack for a good sharp spark, and check the conditions of the spark plug while you're at it. Spark Plug Wires – While not every model and engine combination of vehicles today comes with spark plug wires (a lot are now coil-on plug), if your Trailblazer happens to have plug wires, they can go bad and cause a rough idle. No avail. 2K subscribers Subscribed How to fix a P0306 Code: Cylinder 6 Misfire Detected Spark Inline Tester Tool https://amzn. vicwzu, xayzji, p2ycij, 6qapyr, fipx, jfkn, vczh, m41bsj, f0ep3, heduv,