Tag Archives: Misfire

Engine misfires cause a check engine light and code P0300 and others. Read questions and answers on what to check and how to fix it. Learn common causes for this problem.


Toyota Corolla Engine Problems

Hi. I have a small problem with my Toyota corolla 97 1.6L. has the light of the engine on, take it to auto zone and the code that came out is P0303. According to them it was the helmet of the ignition. I bought him the ignition helmet, the spark plugs, the spark plug wires, the ignition rotor and the injector of that cylinder and…

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Olds Aurora EVAP smoke test

I have a 2003 Oldsmobile Aurora Final 500. Replaced the manifold gasket and Catalytic Converter over the past 4 weeks, and was planning to replace a bad coil pack this week. I do not drive more than 80 – 100 miles a week, usually less. The car ran good except for a misfire that could be felt at idle and low speeds (under 50mph). Also…

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Chevy Trailblazer RPM’s jump up and down

Hi i have a 2002 Trailblazer and my engine light is on. i just had to replace a purge valve, cleaned the throttle body, and replaced the 6th cylinder. While i was driving my car was jerking back and forth while my rpm were dropping then jumping back up again. I’m not to sure what is going on. Answer: Not sure what you mean by…

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Ford Taurus 2001 runs rough and skips

Hello. I have a 2001 ford Taurus V6 ohc engine and when I start it up it skips and runs rough for awhile and will eventually clear up and run perfect. And also it does hesitate once in awhile after it has warmed up. I replaced the temperature sensor but it still acts the same. What should I do to solve this problem? Answer: Check…

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Ford Expedition Vibration When Accelerating

2006 Ford Expedition. My Ford has 113K miles on it. The truck, when getting up to higher speeds runs and shifts perfect.  We changed the ignition coils and spark plugs, transmission fluid, oil changed, and got the catalytic converter checked and it test fine. The U-joints are good to.  The problems are that the idle is fine, but when coming off from a stop accelerating to around 30 mph the RPM’s go up and…

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Check Engine Light P0102- Replaced MAF And Sensors

To Whom It May Concern:I have replaced the following parts:In reference to the P0102 code1) Plugs and Wires (AC Delco).2) Fuel pump and fuel filter.3) Fuel regulator.4) Air filter.5) New Battery.6) New fuel injector (No 1 cyl).7) Checked fuses (O.K.).SENSORS: 1) AIT (Air intake temperature)2) MAP3) MAF4) EVAP Purge control solenoid All new vacuum lines. Checked ground and Voltage at connector. Checks O.K. Vacuum Check…

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Pontiac Grand Prix Catalytic Converter And ABS Codes

Check engine light codes problem with my 2002 Pontiac Grand Prix GT. 3.8L non supercharged. ABS, Track Off and Service engine soon. GM Computer codes  C0045, C0046, C0245, P0303, P0420, P0172. Reason for code P0420 is because I don’t have a catalytic converter. Ever since I retrieved the code P0303 I have changed all of the spark plugs,fuel pressure regulator, fuel injector for cylinder 3 and…

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2000 Dodge Stratus Jolting At Low Speeds

Hello! I own a 2000 Dodge Stratus. Last week I noticed that when I accelerated and decelerated at low speeds my car would ”jolt”. The feeling reminds me of when my old car would stall and my boyfriend describes the feeling as if it is slipping a gear. It only ”jolts” at low speeds (normally around 20 mph) for the first few minutes of the…

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2004 Pontiac Sunfire Misfire On Cylinder Four

I have a 2004 Pontiac Sunfire, and its got a Valve 4 misfire. I have changed the spark plugs, plug wires, coil pack and distributor. What else can I do. I think you mean cylinder 4 misfire, but that’s ok. Since you have changed most of the ignition components, I would say the misfire is not ignition related. You could possibly have a bad fuel injector,…

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2001 Pontiac Grand Prix Chugs And Hesitates

Hello. I have a 2001 Pontiac Grand Prix. When i press on the gas pedal, the car sort of chugs. I always use good gas. This started happening more when it is raining or very damp outside. Don’t know if that is just coincidence or not. With the problem happening more when it is damp outside tells me you probably are experiencing a misfire condition…

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1999 Chevrolet Blazer Misfire Cylinder Number 2

Hello, I have a 1999 Chevy Blazer 4×4, 4.3l Vortec v6. Truck starts, and idle & rev are great til about 2500 rpm. Hooked up OBDII scanner, gave a “P0302” code which states “cylinder 2 misfire”. From what I found on Blazer Forum net, shows possible ignition problems. Went through and changed the distributor cap and rotor. Then the ignition coil, then the swapped plug…

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2006 Chevrolet Trailblazer Engine Light And Misfire Codes

2006 Chevy Trailblazer with 4200 engine and 50,00 miles. why a cylinder #4 and #6 leak? ProTech: What kind of leak? Sorry 50,000 miles. the dealer said they did a leak down test.and the head has to come off for repair. $3,ooo job they say and told my wife vehicle is not worth fixing . Give me a break!! The 2005-2007 models had cylinder head…

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Check Engine Light Code P0300 On GM 2.2L and 2.4L

We have been seeing quite a few problems with the GM 2.2L and 2.4L engines. Mostly on model years 2005 through 2009. This engine is very common in the Chevrolet Malibu, Cobalt and HHR. As well as the Pontiac G5 and G6. This is the 4 cylinder.  The problem I am going to talk about today is a check engine light and misfire codes. Car…

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2003 Olds Alero Transmission or Catalytic Converter Problem

I have a Oldsmobile 2003 Alero with 67000 miles on it. Yesterday the speedometer started going up and down by itself and wont register. Also the car jerks if you go past 30 MPH and it feels like the speed of the car has to catch up with how hard I’m pressing down on the gas.  Any ideas of what could be wrong. ProTech: Sounds like…

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