Check Engine Light Flashing? Misfire Diagnosis By Autolite Spark Plugs




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Did this video help you?

Bill Baldwin: This is from a set of training videos? Where can I buy the whole set? DVD?

Randy Rombach: Please help. 2003 dodge neon. Im still getting p0302 even after changing my ignition coil, platinum plugs, ngk wires, valve cover, valve cover gasket, intake manifold gasket, spark plug tube gaskets, air filter. What else is there to troubleshoot?

cairo car: great work many thanks

DJ Wads: Had a Type A misfire and it smelled like rotten eggs too... Replaced the spark plug wires cause one wasn't firing, didn't fix it so I replaced the coil pack, bingo!

tigaspinoypower: Great video sir... Sir! I have obd2 and i did check my check engine (its not blinking) but steady light and the code is P0303 on my 96 passport v6 engine and said "cylinder 3 missfire" and the thing is i dont know exactly where is cylinder 3, can you please help me locate the cylinder 3. Thanks a bunch....

khalid Qweder: Really useful. Thank You. 

mixtathetrixta: Good job mate!

Alberto Lopez: My audi a4 has a rough idle, the shaking goes away when I accelerate. The dealer changed the coil packs and the spark plugs, still shakes and recently the check engine light flashes when idling. Anyone know what the most likely problem is ????? 

Infiltrator2003: Nice thorough vid

Jessica Moon Hough: This guy knows his stuff!!! and I live by Autolite* Thank You

Timmy ahoia: Awesome Video! 

meTimetraveler: how does the PCM know there was a misfire in a cylinder ? the ox sensor? I had an exhaust rocker arm come off and the PCM through a code for that cylinder.

william john: my f 250 runs worse the more i drive

Bennie Densmore: I have a 95 Honda accord. My car lights (interior and exterior) flashes every time I reach 2500 to 3000 rpm. I've disconnected the negative battery and test it using an Innova 3310 and read a .05 amp. There is know significant drop of amps. Where should I look next??? .

DAVID FERNANDEZ: VERY VERY GOOD AND INFORMATIVE.

SombraLocs: Can someone help me out, My car is having a Type A Misfire. The check engine light would start flashing every now and then especially when driving on a steep road. I took my car to Autozone to get it checked and one of the codes were P0302 which is a Cylinder 2 misfire and the other one is a P0421 a Catalyst system efficiency below threshold. Can anybody tell me what the problems might be and where should I start first? Please I would really appreciate it.

Bryant M: HELP Please!... 2001 S40 Volvo. I have two codes P0303 and P0304 cylinder 3 and 4. Rough idle, stall, poor gas milage, slow acceleration, etc... Both of these cylinders 3 and 4 are coils, and have to slaves wires for 1 and 2. 1-4 2-3 I switched coils to see if anything changed. It did not has the same symptoms. Plugs look "normal", fuel pressure on the line, can't find a vacuum leak, I'm stuck. I have been debating to purchase coils and wires, but they're 150+ and am not sure if that is even the problem.

Tammie Davidson: Check engine light came on my 1998 Honda Accord 3.0. It is showing codes p0304, p0108, p0122, p1519, p1399, 61-01 and 81-01. Replaced plug wires and plugs, distributor cap and rotary cap, and changed several sensors and It is still doing the same thing and showing the same codes. Could you help please

harooni22: man a misfire is a major pain in the ass

malaska91: is it possible to have a misfire with no codes showing?

Shafii Zuberi: I

Jose Garcia: Start by checking the spark on cylinder #2 I had the same issue on a Ford escape, it had a bad ignition coil, get rid of the misfire and then you will probably have to replace the cat as I did! Misfires kill the cat

jphritz011: Thank you!!

cadzillals6: When the engine light is flashing, that is a hard misfire. This type of misfire will quickly destroy your catylitic converter. You need to have it scanned for codes, any autozone will do this free. Most common causes are bad spark plugs, bad spark plug wires, bad coils in that order. Let us know what the codes are and we can try to help.

cadzillals6: Misfire on cylinder number four.

rsanch8695: Thanks Jay! However! My instincts to re do the test at another Autozone paid off! Obviously the last tech either was not familiar with the instrument or was just plain lazy or both. The tech at the recent Azone diagnosed (with the same instrument) a mis fire in the 6th cylinder. So a new coil wire and plug will do the trick. But the 6th plug is a beast to get to so here goes the wallet upside down!. Thanks again!

cadzillals6: Daniel, Have you tried swapping injectors to se eif that is the problem? Need to check compression as well. Sears actually sells a pretty sweet compression tester for around 50 bucks,

slednck3: my 96 crown vic had grounded out because of stereo harness and all electrical components had blown and an hour later my cars got a check engine light and today not moving just idleing i got a flashing check engine light

cadzillals6: Sounds like your fuel pump check valve is leaking. Attaching a fuel pressure guage to the test port will show if it is. It should hold pressure overnight.

xadam2dudex: cars r too complex now days...it's time for electric cars

next492: P0300 check ur engine oil, if it got like chocomilk or diferent color then it means replaced head gasket, P0171 put new air filter, if it stills there then change Maf sensor P0442 change the gas gop, try these I fixed in the past this codes

cadzillals6: You need to test fuel pump output for both pressure and volume.

James Branson: How would a problematic distributor cause a random misfire? I have a 98 Sebring with a distributor that was recently changed and has been running like crap ever since then. Should I just have it replaced to stop the random misfire?

Ulysses Gladden: Awesome clear video

cadzillals6: @abaga1299 I would be happy to try. What kind of car and what is going on? You can email me directly at jay.buckley@framgrp.com

Jessie Taylor: I have a 2008 dodge avenger and the check engine light been flashing the dealer said it was a blowin head gasket so I changed it now the number four spark plug misfiring I can take it out and it fires everything could the catylitic converter be bad ???? could that cause it to misfire???

ib4babes: My 02' Infinity QX4 engine light flashes on highway or wen i raise the engine @ high RPM and i use extra fuel lately. Getting PO304 code. what might be the cause?

uh bunch: I have a 2007 Expedition with 5.4 L triton. A heater hose over the passenger bank of the engine began leaking. Antifreeze pooled on top of the engine and around the spark plug boots. I replaced the bad heater hose and shop vac'd the coolant off and down around the plugs. When test driving the check engine light started flashing and the engine sputters. Does this sound like the spark plugs are wet with antifreeze? I thought driving would evaporate it. Next stop Autozone for code reading.

carl watson: hi i think the coolant is on the boot or ignition coil ford s are famous for the coil problem

03lew03: 1998 Blazer, new fuel pump, new plugs,new wires , new cap and roter. Check engine light is on. Hard idle sometimes.

ponchopio64: One of the best diagnostic videos I've seen. Outstanding! I learned an immense amount. Thank you for taking the time and putting the effort forth to produce a video of this quality.

Roderick Wade: hey jay i have a 08 cadillac sts and when driving the car if you try to give it gas it jerks and loses power and the check engine light sometimes flashes or comes on and stays on it only does this if you try to give it gas to pass someone or speedup i took it to the cadillac shop and they said it was a misfire and just cleared the code and said it would be fine well its not now its worse any ideas

jnnycliff: or just trad in the old car for a newer used one? cheap but reliable toyota or honda car.

uh bunch: If a misfire results from antifreeze pooling around the spark plug valleys, what is it most likely to foul: a coil, a wire or a plug? I've read numerous posts about the difficulty and chances of breaking spark plugs on these engines that I don't want to just jump in there and start removing plugs just yet...

Tiffany Peel: Hello :) I have a 2002 Ford Taurus. I recently replaced the coil pack due to a couple hairline cracks, but my engine is still misfiring. Is is possible for a cracked coil pack to ruin spark plugs or spark plug wires? Would it be worth it to replace them?

NONE: Hi, I have a Ford Taurus.. The problem is as exact as you say in the video. P0300, P0171, and P0174 are appear on my vehicle check engine light. i took to two shops, they all recommend me to take tune-up first. So. Could I comfirm that is a vacuum leak?

SophieMia806: The only difference now is that my engine light just came on this past Tuesday, and started blinking. I had never seen it blink before & it kind of worried me. I just hope these new coils & boots fix the problem, because they can't be returned. And the mechanic wanted $1000 for parts & labor. Thank goodness for auto parts stores.

adam murphy: This has to be the best video I have seen to help me understand better, I have a 2000 mustang gt with a p0300 code that has been a pain to try and figure out

rsanch8695: Here's the deal. About 6 months ago i had my 06 durango tunes up. Just the other day I pulled my battery cables off to clean the terminals. After that, the eng lite came on and began to misfire. The autozone tech could NOT get a reading code period. suggested a few things one of them, to let it ride out. After this video, I'm not too sure! HELP!
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Check Engine Light Flashing? Misfire Diagnosis by Autolite Spark Plugs 4.8 out of 5

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Check Engine Light Flashing? Misfire Diagnosis by Autolite Spark Plugs