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Misfire after changing spark plugs - Colorado Chevrolet Cars & Trucks

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 436 Answers

SOURCE: misfiring while driving

Check the spark plugs, make sure they all seated and are tight. Also change wires. Probably the coil packs, but check the cheaper stuff first.

Posted on Nov 17, 2009

BCAS1298
  • 3092 Answers

SOURCE: odb 0308 - misfire #8 odb 0300 - random

Look at the spark plug, if looks ok then that's not the problem.with spark plug out check cylinder compression if good then check fuel injector, reinstall spark plug, start engine and listen for clicking noise at fuel injector, if none bad injector replace.

Posted on May 14, 2010

  • 30 Answers

SOURCE: 1998 misfiring in all gears, speed. i change the

Hi! before I start, just want to say WOW! sorry to hear that you spend alot money and nothing changes happen. The best way to save money is to scan the car for diagnose, you can buy this scanner in any auto parts for about lowest $50.00 or more depends on there brand. Every engine requires four basic ingredients to start: sufficient cranking speed, good compression, adequate ignition voltage (with correct timing) and fuel (a relatively rich air/fuel mixture initially). So any time an engine fails to start, you can assume it lacks one of these four essential ingredients. But which one? To find you, you need to analyze the situation. If the engine won't crank, you are probably dealing with a starter or battery problem. If the engine won't crank or cranks slowly when you attempt to start or the engine (and the battery is fully charged), you can focus your attention on the starter circuit. A quick way to diagnose cranking problems is to switch on the headlights and watch what happens when you attempt to start the engine. If the headlights go out, a poor battery cable connection may be strangling the flow of amps. All battery cable connections should be checked and cleaned along with the engine-to-chassis ground straps. If you see a good hot spark when you crank the engine, but it won't start, check for fuel. The problem might be a On an older engine with a pump the throttle linkage and look for fuel squirting into the carburetor throat. No fuel?
On newer vehicles with electronic fuel injection, connect a pressure gauge to the fuel rail to see if there is any pressure in the line. No pressure when the key is on? Check for a failed fuel pump, pump relay, fuse or wiring problem.
On Fords, don't forget to check the inertia safety switch which is usually hidden in the trunk or under a rear kick panel. The switch shuts off the fuel pump in an accident. So if the switch has been tripped, resetting it should restore the flow of fuel to the engine. Lack of fuel can also be caused by obstructions in the fuel line or pickup sock inside the tank. And don't forget to check the fuel gauge. It is amazing how many no starts are caused by an empty fuel tank. There is also the possibility that the fuel in the tank may be heavily contaminated with water or overloaded with alcohol. If the tank was just filled,might be causing the problem. On EFI-equipped engines, fuel pressure in the line does not necessarily mean the fuel is being injected into the engine. Listen for clicking or buzzing that would indicate the injectors are working. No noise? Check for voltage and ground at the injectors. A defective ECM may not be driving the injectors, or the EFI power supply relay may have called it quits. Some EFI-systems rely on input from the camshaft position sensor to generate the injector pulses. Loss of this signal could prevent the system from functioning. Even if there is fuel and it is being delivered to the engine, a massive vacuum leak could be preventing the engine from starting. A large enough vacuum leak will lean out the air/fuel ratio to such an extent that the mixture won't ignite. An EGR valve that is stuck wide open, a disconnected PCV hose, loose vacuum hose for the power brake booster, or similar leak could be the culprit. Check all vacuum connections and listen for unusual sucking noises while cranking. If an engine that has fuel and spark, no serious vacuum leaks and cranks normally should start. but still no start? The problem is If it is an overhead cam engine with a rubber timing belt, a would be the most likely cause especially if the engine has a lot of miles on it. Most OEMs recommend replacing the OHC timing belt every 60,000 miles for preventative maintenance, but many belts are never changed. Eventually they break, and when they do the engine stops dead in its tracks. And in engines that lack sufficient valve-to-piston clearance as many import engines and some domestic engines do, it also causes extensive damage (bent valves and valvetrain components & sometimes cracked pistons). Overhead cams can also bind and break if the head warps due to severe overheating, or the cam bearings are starved for lubrication. A cam seizure may occur during a subzero cold start if the oil in the crankcase is too thick and is slow to reach the cam (a good reason for using 5W-20 or 5W-30 for winter driving). High rpm cam failure can occur if the oil level is low or the oil is long overdue for a change. With high mileage pushrod engines, the timing chain may have broken or slipped. Either type of problem can be diagnosed by doing a compression check and/or removing a valve cover and watching for valve movement when the engine is cranked. A may prevent an engine from starting if the engine is a four cylinder with two dead cylinders. But most six or eight cylinder engines will sputter to life and run roughly even with a blown gasket. The gasket can, however, allow coolant to leak into the cylinder and hydro lock the engine.
Well I hope some of this 411 will resolve your problem. take care & best of luck...






Posted on Sep 21, 2010

SOURCE: I changed the spark plugs in my 2003 chevrolet trailblazer and its still saying mulitiple misfire

Hi Julie, i believe the problem on your vehicle will be from the individual ignition coils which fir ontop of each of the spark plugs. Regards John

Posted on Feb 18, 2012

  • 33272 Answers

SOURCE: I changed the spark plugs and now it's misfiring

The plug wires may have been damaged during the plug change

Posted on Jun 08, 2013

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97 acura 2.2 cl engine light p0302 code


A P0302 is indicating that cylinder # 2 is misfiring...Cylinder # 2 is the second plug counting from the front to rear of engine...Main causes for misfire are: defective spark plug, spark plug wire...When was last time plugs were changed? if it has been awhile I would suggest changing them...Also the spark plug wires should be replaced...Changing one plug and/or one wire isn't a good idea; change them all...Plugs cost two or three dollars apiece and a set of wires around $15...Standard motor products wire set # 4717...Spark plugs; Bosch platinum gaped at .044

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oil on the plugs is an indication of worn engine and ting problems
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I changed the spark plugs and now it's misfiring


The plug wires may have been damaged during the plug change

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My 2005 misfires and has comuper code that says my temp sensor isn't working. How do I change the spark plugs


faulty temperature sensor causing the misfire problem, replace the coolant sensor the misfire problem will be fix.

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I changed the spark plugs in my 2003 chevrolet trailblazer and its still saying mulitiple misfire


Hi Julie, i believe the problem on your vehicle will be from the individual ignition coils which fir ontop of each of the spark plugs. Regards John

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I have a mazda mpv 2000 minivan.problem code p0301 misfire detected cylinder#1


I'd check #1 spark plug.
Usually a misfire code "fix" is a spark plug, spark plug wire, or a coil pack / distributor.
Keeping it simple...I'd go with the spark plug first and then look at the condition of the wires.

Hope this helps...

Aug 28, 2011 | 2005 Mazda MPV

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Odb 0308 - misfire #8 odb 0300 - random


Look at the spark plug, if looks ok then that's not the problem.with spark plug out check cylinder compression if good then check fuel injector, reinstall spark plug, start engine and listen for clicking noise at fuel injector, if none bad injector replace.

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Misfiring while driving


Check the spark plugs, make sure they all seated and are tight. Also change wires. Probably the coil packs, but check the cheaper stuff first.

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Hi, I have a 1997 Porsche 993. Motronic 5.2 M07. I am getting these fault codes 1) 62 misfire emissions-relvant 2) 51 Cylinder 2 misfire emissions-relevant) 3) 54 Cylinder 5 misfire ...


misfire :-------- try checking your 02 sensors /fuel pump and filter.

for 51 cylinder misfire :---
Change the coil. Period. Very easy to remove from the vehicle if it's a 4 cyl. Follow that spark plug wire from the spark plug to the other end. What it's attached to you should replace
for 54 cylinder 5 misfire :---First you have to eliminate the most obvious problems, like spark plug and spark plug wire. If you replace those and you still have a misfire, then it's a good idea to look for a vacuum leak in the intake manifold

Mar 07, 2009 | Porsche 911 Cars & Trucks

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