help 94 mustang 3.8 bad miss spitting fuel out tail pipe

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  #1  
Old 10-07-07, 07:11 PM
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help 94 mustang 3.8 bad miss spitting fuel out tail pipe

hi i put my 94 rag top mustang up for sale and i let a lady take it for a test ride (without me)this car ran great before she left i drove it every day wen she brout it back it was running bad no power and spitting fuel out the tail pipe she sed she took it to a friend to look at but he did nothing to it just looked under the hood so anyway i changed the plugs and wires checked the firing order just to make shure but now im not shure what else to do any help would be great and yes the check engin light is on now i know i could take it to auto zone for a scan but it runs to bad to drive it please help
 
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  #2  
Old 10-07-07, 08:11 PM
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I don't think your car is OBDII compliant so I don't think Autozone will be able to scan your codes.

These 3.8's of your year were notorious for head gasket failures and there was a recall on them.

I had a 94 Stang 3.8 back when they came out and that is what happened with mine. It did the same thing you are describing. It may not be what is wrong, but it's worth looking into.

How has the temp reading been lately?
 
  #3  
Old 10-08-07, 06:22 PM
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Question the temp reading is fine

theres no water in oil or oil in water the temp stays were it should and i tried to buy a scanner at auto zone today and they don't have one for the 94 so I'm just not sure what to do next i don't want to take it to the shop
 

Last edited by slickshift; 10-08-07 at 06:35 PM. Reason: edited for content
  #4  
Old 10-08-07, 06:40 PM
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You can DIY the codes on this EEC-IV controlled pre-OBII engine

http://www.troublecodes.net/Ford/

or

http://fordfuelinjection.com/?p=13

And ed, please be considerate of the professional mechanics, shop owners, and other service people that volunteer to delve into these forums to help people DIY car work free of charge by being careful in how you refer to them
Thank You
 
  #5  
Old 10-08-07, 07:09 PM
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sorry and i do thank everyone for any help thay can offer

i didn't mean anything bad about mechanics i was talking about the hourly price at a dealership and i know its a set price and its not the mechanics that set it thats all

also i bout the book for the 94 mustang and you can only check the codes like that on the 5.0 not the 3.8 unless theres another way and i don't know it but i do like them links and I'm sure sometime i will need them on another car down the road
 
  #6  
Old 10-08-07, 07:51 PM
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Originally Posted by ed_r_mustang View Post
... you can only check the codes like that on the 5.0 not the 3.8...
Ah...sorry 'bout that
I thought it'd work for all pre-OBD-II
Don't know a separate procedure for 3.8s
 
  #7  
Old 10-08-07, 08:27 PM
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The procedure slick posted should work.

Doesn't matter what engine, just ground out the A&B terminal of the test plug and count the flashes.
 
  #8  
Old 10-09-07, 06:24 AM
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weres the test plug on my 3.8

Originally Posted by HotinOKC View Post
The procedure slick posted should work.

Doesn't matter what engine, just ground out the A&B terminal of the test plug and count the flashes.
can you please tell me if anyone knows were the test plug is on my 94 3.8 becouse theres no plug like what thay show and ill give it a shot thank you
 
  #9  
Old 10-10-07, 05:14 PM
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code p0302-p0306

OK i scanned the car with a OBDII and it showing number 2 and 6 cylinders misfire this car has new plugs and wires it seems to have good spark going to the plugs can anyone help me from here the coil pack seems to have good spark
 
  #10  
Old 10-10-07, 05:45 PM
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Have a compression test done on the cylinders to help rule out a blown head gasket.

Here is a ignition coil test procedure that should be done as well.

http://www.autozone.com/az/cds/en_us...rInfoPages.htm
 
  #11  
Old 10-12-07, 01:59 PM
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compression in all cylinders 150-160

OK i did the compression test today 150-160 in all cylinders i guess thats good does anyone have any suggestions on were to go know and again i would like to thank everyone for the help theres a lot of good people on here thanks everyone
 
  #12  
Old 10-12-07, 02:20 PM
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Double check your wire routing on the plug wires
Make sure none are too close to any others
Two wire too close together could cause this misfire*
Use a loom (separator) if need be
Make sure they are all tight (plugs in head, wires to plugs)

I don't remember if this engine has cap/rotor
If it does, check for loose, cracked, or wrong install

I'm sure her friend messed with something
Probably something simple...something easy to mess up...just hard to figure out what

*As could after market wires (with this vintage Ford)...what kind of wires/plugs are in there now?
 
  #13  
Old 10-12-07, 06:09 PM
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could this just be my coil

the wires are fine and neatly fastened and the plugs are fine to my coil goes 123-465 and because 2 and 6 are across from each other do they fire together if so the coil pack is probable my problem then what do you think hotinOKC sent a link on how to test it but it don't show a coil pack
 
  #14  
Old 10-12-07, 06:57 PM
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try the link below but usually you can tell the coil is bad by checking for spark at the coil by using a test light hooked to ground and removing one wire and having someone start the engine while holding the test light about 1/2 inch from the coil tower comparing the spark to other cylinders a bad coil may not have any spark or a noticably weak one that usually will not jump a 1/2 inch gap.
http://www.autozone.com/az/cds/en_us...rInfoPages.htm
 
  #15  
Old 10-13-07, 12:51 PM
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the coil is fine

well today i checked the coil but no luck there it tests good what do you think know maby the crank sensor
 
  #16  
Old 10-13-07, 03:46 PM
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I'd pull the plug wires off each plug and reseat them; the girl's mechanic might have pulled wires off and not gotten them on correctly leading to a misfire.
Good luck.
 
  #17  
Old 10-13-07, 06:52 PM
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its not the plugs or wires

Originally Posted by bob22 View Post
I'd pull the plug wires off each plug and reseat them; the girl's mechanic might have pulled wires off and not gotten them on correctly leading to a misfire.
Good luck.
i thank you for the help but its not the plugs or wires i went out and got new ones and i checked them over and over the problem is that cylinder 2 and 6 got spark there just misfiring (not firing at the right time)which is causing the gas to go into the exhaust instead of burning i just cant figure out the reason why
 
  #18  
Old 10-13-07, 07:16 PM
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how did you test for spark if your just sticking a spark plug in the wire and seeing if it sparks it isnt a good enough test even a weak coil can fire a plug out of the cylinder it takes alot more voltage to fire the plug under compression wich is why spark testers often have adjustable gaps or an extremly large gap.
what else have you checked have you might check for vacum leaks do the injectors appear to be working on those cylinders?
 
  #19  
Old 10-13-07, 07:19 PM
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it may be dumping to much fuel into those two cylinders might pull the vacum line off the fuel regulator to see if its leaking and flooding those 2 cylinders what cylinders the fuel goes into is often only reletive to the vacum line position on the intake when a regulator goes bad.
 
  #20  
Old 10-13-07, 07:33 PM
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new fuel regulator

Originally Posted by bejay View Post
it may be dumping to much fuel into those two cylinders might pull the vacum line off the fuel regulator to see if its leaking and flooding those 2 cylinders what cylinders the fuel goes into is often only reletive to the vacum line position on the intake when a regulator goes bad.
i changed the fuel regulator i don't think it was bad but i bought a new one anyway i thought that might be it to but again no luck and i used a ohm meter to check the coil and the injectors seem to be fine there working its getting the fuel its just not burning it in 2/6
 
  #21  
Old 10-13-07, 07:43 PM
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would be doing a spark test on the coil pack if you dont have a spark tester make one with an old plug just cut off the ground electrode so it has to jump a larger gap to go to ground you can also use a test light or scredwiver and jumper wire to ground for checking directly at the coil.
 
  #22  
Old 10-14-07, 07:28 AM
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today im taking the coil to auto zone

Originally Posted by bejay View Post
would be doing a spark test on the coil pack if you dont have a spark tester make one with an old plug just cut off the ground electrode so it has to jump a larger gap to go to ground you can also use a test light or scredwiver and jumper wire to ground for checking directly at the coil.
even though i checked the coil with a ohm meter like it shows in the book today I'm taking it off and I'm taking it to auto zone to see if they can check it for me
 
  #23  
Old 10-14-07, 12:01 PM
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bought a new coil pack

well today i bought a new coil pack and still no luck thats not the problem
 
  #24  
Old 10-14-07, 04:45 PM
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double check your firing order one more time use the link below to help you if its ok would suggest you just have a shop diagnose it.
http://www.moddedmustangs.com/ford-f....html#more-218
 
  #25  
Old 10-14-07, 06:27 PM
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New plugs, wires, and coil pack, right? Compression all appears to be good. I'm starting to wonder if the #2 and #6 injectors are stuck open or shorted.
 
  #26  
Old 10-14-07, 06:46 PM
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Originally Posted by warhammerdriver View Post
New plugs, wires, and coil pack, right? Compression all appears to be good. I'm starting to wonder if the #2 and #6 injectors are stuck open or shorted.
I was thinking that earlier in the discussion but figured he would get a "too lean" DTC and not just the misfiring.
 
  #27  
Old 10-14-07, 07:23 PM
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do you think maby the crankshaft or the camshaft senser could make this car act up like this
 
  #28  
Old 10-14-07, 09:13 PM
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is your coil numbered like this?
123
465
or like this?
123
564
the bottom one should be correct.
still think its something simple, and ive never seen a cam or crank sensor cause a misfire on two cylinders however the ignition module or pcm could possibly cause 2 cylinders not to fire but a simple spark test would tell you if the coil is working, if it was module or pcm related you would not have spark on those 2 cylinders if you have spark would see a shop for diagnossis as youve already spent way to much trying to fix this problem and the car could of already been repaired had you took it to a shop to begin with.
 
  #29  
Old 10-15-07, 06:55 AM
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Originally Posted by bejay View Post
is your coil numbered like this?
123
465
or like this?
123
564
the bottom one should be correct.
still think its something simple, and ive never seen a cam or crank sensor cause a misfire on two cylinders however the ignition module or pcm could possibly cause 2 cylinders not to fire but a simple spark test would tell you if the coil is working, if it was module or pcm related you would not have spark on those 2 cylinders if you have spark would see a shop for diagnossis as youve already spent way to much trying to fix this problem and the car could of already been repaired had you took it to a shop to begin with.
its 123-564 and yes i got spark
 
  #30  
Old 10-15-07, 01:34 PM
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a local mechanic thinks i should try the ignition module what do you think could this do this to my car
 
  #31  
Old 10-16-07, 04:01 AM
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if the car has good spark when running to both those cylinders then I dont see a module causing the problem and for what the module cost you could probably pay a shop to diagnose the problem for you, even if you do the repairs knowing whats wrong exactly will allow you to not waste any more on parts that the car does not need.
 
  #32  
Old 10-16-07, 07:16 AM
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well i guess its time to go to the shop

i would like to thank every one for all there help your a great bunch and i guess as soon as i got the time I'm going to have the car towed to the shop i will let you know what the problem was as soon as i fined out and again thank you all
 
  #33  
Old 10-20-07, 04:56 PM
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i was going to have the car towed to the shop today but thought i would give it one more try i got a computer out of a 95 windstar with the same 3.8 motor for free so i thought i would try it and theres no more fuel out the exhaust and no more misfire codes but i now have to more codes p0443 purge valve c fault and p0760 shift solenoid c malfunction and i cant fined a shift solenoid in my book so is this because i used the windstar computer
 
  #34  
Old 11-06-07, 07:48 PM
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Originally Posted by ed_r_mustang View Post
i was going to have the car towed to the shop today but thought i would give it one more try i got a computer out of a 95 windstar with the same 3.8 motor for free so i thought i would try it and theres no more fuel out the exhaust and no more misfire codes but i now have to more codes p0443 purge valve c fault and p0760 shift solenoid c malfunction and i cant fined a shift solenoid in my book so is this because i used the windstar computer
P0760 is an automatic transmission code. You never said if your Mustang is a manual trans or not. P0443 is an evaporative emissions code.

It's possible the original PCM just needs to be reprogrammed, but I doubt it.
 
  #35  
Old 11-09-07, 09:43 AM
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the problem is solved

it was the computer i got a used one from ebay $45.00 now the car runs great i just need to change the oil again and off i go i would like to thank ever one for all the help and suggestions your a good group thanks again and ill keep checking to see if maby i can help some one on here in the future
 
  #36  
Old 11-09-07, 06:15 PM
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So you first had YOUR computer. The you put in the 95 computer and it fixed certain things - but brought 2 different codes? And then you went and got yet another computer? Explain the 95 one more, if you are still around, just for curiousity sake.
 
  #37  
Old 11-28-07, 10:21 PM
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hey man i had same prob exactly

ok i was stumped too but i had raw fuel comming out the drivers side tailpipe so depending on the side check all plugs on that side and the wet one is a stuck wide open injector
swear on it dude .

also if youve been messing (OR TEST DRIVER WAS ) with it my idle prob came when i was checking to see what the raw Fuel prob was and knocked the vacum line at the back underside of the plenum
off could hardly hear the leak but was really faint pluged it back on and idle fluxuation (missing like ****) was gonzo

hope this helps also if you have a buddy wirh 94-95-96 borrow there pcm (computer) i had mine crap out the first week i had mine and ran real ****ty missing and power loss .

good luck johnrockjon

p.s hit me back when you get it fixed

( nothing better for no how than a good head scratchin) lol
 

Last edited by 94 v6; 11-28-07 at 10:23 PM. Reason: spelling
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