Misfire cylinder #1 with Check Engine Light - Mustang Evolution

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Old 03-02-2011, 05:09 AM   #1
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Misfire cylinder #1 with Check Engine Light

hey everyone- im new to the site but really need some advice.

i have a 99 mustang with about 150k miles on her. i did some preventative maintenance work but havent been able to clear the check engine light with code misfire in cylinder #1.

so the background story-
the waterpump had a hairline crack but the engine NEVER overheated and was not driven until it was replaced. i did the cooling component replacements only to have the check engine light surface a day or 2 later.

i tried to go the ea$y/ logical route by changing plugs and wires. computer reset but code popped up again 2 days later. i got ansy and replaced the ignition coil and all was well for about 2 days and sure enough the light came back on.

i assume the next replacement would be the fuel injector for the cylinder, but i intend to (test)switch injectors to see if the misfire follows.

i have replaced/fixed a few things in the last 2 weeks-
water pump
radiator flush
thermostat
belts
upper and lower hoses
air filter
fuel filter
spark plugs
wires
ignition coil
oil and filter change
transmission fluid filter change

currently-
the car runs ok. i did notice a drop in mpg but after the ignition coil pack replacement it has returned to "normal" mpg. it idles fine, isnt sporadic doesnt just die or anything, BUT there is a noticable "wobble" or vibration/hesitation at about 45-50 mph. im assuming that is a shifting point. i did also notice that the wobble went away after i replaced the coil pack but a day or 2 later it came back along with the check engine light.

if i have missed any steps or any other possible solutions/experiences- i am all ears.
thanks in advance everyone
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Old 03-02-2011, 09:41 AM   #2
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Try spark plugs. Mine did the exact same thing. I replaced the spark plug and its perfectly fine now
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Old 03-02-2011, 11:17 AM   #3
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Re: Misfire cylinder #1 with Check Engine Light

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Originally Posted by JRMustang View Post
hey everyone- im new to the site but really need some advice.

i have a 99 mustang with about 150k miles on her. i did some preventative maintenance work but havent been able to clear the check engine light with code misfire in cylinder #1.

so the background story-
the waterpump had a hairline crack but the engine NEVER overheated and was not driven until it was replaced. i did the cooling component replacements only to have the check engine light surface a day or 2 later.

i tried to go the ea$y/ logical route by changing plugs and wires. computer reset but code popped up again 2 days later. i got ansy and replaced the ignition coil and all was well for about 2 days and sure enough the light came back on.

i assume the next replacement would be the fuel injector for the cylinder, but i intend to (test)switch injectors to see if the misfire follows.

i have replaced/fixed a few things in the last 2 weeks-
water pump
radiator flush
thermostat
belts
upper and lower hoses
air filter
fuel filter
spark plugs
wires
ignition coil
oil and filter change
transmission fluid filter change

currently-
the car runs ok. i did notice a drop in mpg but after the ignition coil pack replacement it has returned to "normal" mpg. it idles fine, isnt sporadic doesnt just die or anything, BUT there is a noticable "wobble" or vibration/hesitation at about 45-50 mph. im assuming that is a shifting point. i did also notice that the wobble went away after i replaced the coil pack but a day or 2 later it came back along with the check engine light.

if i have missed any steps or any other possible solutions/experiences- i am all ears.
thanks in advance everyone
Perform a Compression test and leakdown test. #1 cylinder may have a problem.
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Old 03-02-2011, 11:30 AM   #4
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Re: Misfire cylinder #1 with Check Engine Light

a misfire can also be triggered if the harmonic balancer is backing out cuz the ring gear on it wont line up perfectly with the sensor. I am not saying this is happening but you dont want the harmonic balancer backing out... You can TQ it down to the recommended spec (which is HIGH) to ensure its on good~
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Old 03-02-2011, 03:53 PM   #5
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What is the codes coming up?
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Old 03-02-2011, 04:01 PM   #6
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Re: Misfire cylinder #1 with Check Engine Light

@ Saleen- compression test results were good

@ Spector- how to you go about checking/fixing that? sounds complicated =)

@ Alscobra- P0301

thanks fam for the responses
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Old 03-02-2011, 04:08 PM   #7
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Plug wire, plug, injector, vacuum leak, ign coil. Gotta start somewhere. See what the #1 plug looks like when you pull it. Black/wet/white. Let us know what the plug tip looks like or post a pick of it.
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Old 03-02-2011, 04:14 PM   #8
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Re: Misfire cylinder #1 with Check Engine Light

ya, i replaced all those parts last week cept for the injector- i will get to that once the rain lets up. im not sure how to find where a vaccuum leak would be if all the rest of the issues are checked off the list
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Old 03-02-2011, 04:45 PM   #9
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Throw more parts at it until something sticks or you run out of money. Lol
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Old 03-02-2011, 04:45 PM   #10
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Re: Misfire cylinder #1 with Check Engine Light

Are you sure it's an actual misfire and not just a reported misfire by the ecu?
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Old 03-02-2011, 04:52 PM   #11
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Re: Misfire cylinder #1 with Check Engine Light

Do a leak down test. Also, test the coolant system pressure it should hold atleast 16psi.
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Old 03-02-2011, 05:02 PM   #12
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What did the #1 plug look like? You can learn a lot from just that.
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Old 03-02-2011, 05:08 PM   #13
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Re: Misfire cylinder #1 with Check Engine Light

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What did the #1 plug look like? You can learn a lot from just that.
Yea, white/black, worn electrode, any abnormalties?
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Old 03-02-2011, 05:11 PM   #14
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Re: Misfire cylinder #1 with Check Engine Light

@ bleeder - its looking like that. i am about at the point to just let it ride, been looking at the new 2011s anyway haha

@ saleen - compression for coolant system was good. i dont think i have the goods to complete a leak down anytime soon, but thats sounds like a good idea. i would have to say there is a misfire bc of the loss of a few mpg and that wobble at 45-50, BUT it could be something really simple causing it.... working on the 64 1/2 was so much easier haha

injector will be cleaned sometime in the next few days- weather permitting.
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Old 03-02-2011, 05:14 PM   #15
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Re: Misfire cylinder #1 with Check Engine Light

i wish i had taken pics of the plugs, they didnt look any different than others. no residue or gunk, i probably shouldve taken a much closer look at the electrode but at first glance things were up to par - idiot i know

replacements were brand new motorcraft
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Old 03-02-2011, 05:18 PM   #16
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One thing you have to realize. The cel system and the PCM are there for 1 purpose before anything. Protect the catalytic converter. It's gonna do whatever it has to make sure the cats are not damaged and are doing their job. It may dump extra fuel because you r not getting enough in one cylinder. It may cut back if you are not firing. Do you have a scanner?
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Old 03-02-2011, 05:33 PM   #17
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Re: Misfire cylinder #1 with Check Engine Light

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@ bleeder - its looking like that. i am about at the point to just let it ride, been looking at the new 2011s anyway haha

@ saleen - compression for coolant system was good. i dont think i have the goods to complete a leak down anytime soon, but thats sounds like a good idea. i would have to say there is a misfire bc of the loss of a few mpg and that wobble at 45-50, BUT it could be something really simple causing it.... working on the 64 1/2 was so much easier haha

injector will be cleaned sometime in the next few days- weather permitting.
Try to look for any wiring issues espescially around the injectors, plugs, coils, make sure individual wires are not missing insulation or rubbing a bolt/stud/bracket or anywhere.
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Old 03-02-2011, 07:33 PM   #18
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Re: Misfire cylinder #1 with Check Engine Light

@ alscobra - i dont have my own scanner =( yet =)

@ saleen - ill get on that. on a side note- good job with kickin the butts keep it up!
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Old 03-02-2011, 07:37 PM   #19
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Quote:
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@ alscobra - i dont have my own scanner =( yet =)

@ saleen - ill get on that. on a side note- good job with kickin the butts keep it up!
You've spent enough to go get one. Go buy a cheap generic job. You just need to check and clear codes with it. Everything else you can google. Try swapping injectors with one on the opposite side. It will cost nothing.
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Old 03-02-2011, 07:55 PM   #20
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Quote:
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@ saleen - ill get on that. on a side note- good job with kickin the butts keep it up!
? Explain
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Old 03-02-2011, 07:56 PM   #21
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Re: Misfire cylinder #1 with Check Engine Light

i was talking about the cigarette banner in your signature- unless its just an ad?
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Old 03-02-2011, 07:58 PM   #22
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i was talking about the cigarette banner in your signature- unless its just an ad?
Ahhh thanks buddy! Yea, its def a thing of the past cold turkey is the only way.
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Old 03-02-2011, 07:58 PM   #23
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Re: Misfire cylinder #1 with Check Engine Light

@ alscobra - i dont mind investing in one since i do have a few other cars i am working on, and probably will need it in the future anyway. you have any suggestions on what i should get- like top options maybe?
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Old 03-02-2011, 08:00 PM   #24
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Quote:
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@ alscobra - i dont mind investing in one since i do have a few other cars i am working on, and probably will need it in the future anyway. you have any suggestions on what i should get- like top options maybe?
Just a code reader. The other BS is just to generic for true diag unless UR a mechanic. Get a handheld tune and you can really use it later for tuning and code reading. Although it wont read other vehicles.
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Old 03-02-2011, 08:17 PM   #25
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Now for some diagnosis help. The best way to diag a miss without throwing parts at it is to play musical parts. Move the plug, wire, injector from that cylinder to different cylinders. Reset the light and see where it comes back. Is it missing all the time or only under load? Does it buck goin up hill? Do not assume a new part us a good part. There was a 3.8 thread a little while ago where it turned out a rocker had backed off.
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Old 03-02-2011, 08:34 PM   #26
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Re: Misfire cylinder #1 with Check Engine Light

good advice fellas, thanks again. its been cold and rainy in san jose- almost snowed! my garage is full of stuff right now, not including my mustang
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Old 03-03-2011, 10:16 PM   #27
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Quote:
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good advice fellas, thanks again. its been cold and rainy in san jose- almost snowed! my garage is full of stuff right now, not including my mustang
Anything today?
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Old 03-07-2011, 11:52 PM   #28
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Re: Misfire cylinder #1 with Check Engine Light

hey guys! got an obd2 scanner from my uncle a few mintues ago. havent done anything new to the mustang yet- injectors still havent been cleaned.

long weekend, but will get on it. i am doing my dads explorer at the same time, the mustang engine bay is much friendlier.

hope yall had a good weekend
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Old 03-14-2011, 07:03 PM   #29
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Re: Misfire cylinder #1 with Check Engine Light

I have the exact problem, p0301. I've done everything but changed the injector. I hope ypu resolve the issue. Good luck.
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Old 03-15-2011, 12:49 AM   #30
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Fouled plug perhaps

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