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95 ford mustang runs on 4 cylinders
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vw200486
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Feb 20, 2007, 1:59 PM
Post #1 of 25
(1976 views)
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95 ford mustang runs on 4 cylinders
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hi i have a 95 ford mustang 3.8 6 cylynder it has a rebuilt engine in it and it wont run right.
my problem is that its only giving spark to 4 cylinders ive tryed everything to fix the problem ive changed the ignition control modual, the pcm, the coil, the cranshaft positioning sensor and nothing seems to change it, and when you pull the plug wires off to check for spark the spark is red not blue like it should be.
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DanD
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/ Moderator
Feb 20, 2007, 2:24 PM
Post #2 of 25
(1974 views)
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Re: 95 ford mustang runs on 4 cylinders
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Lose the links in your post so I don’t feel like I’m reading spam and maybe we’ll take a closer look at the problem.
Sorry if I'm out of line but I hate spam.
Dan.
Canadian "EH"
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vw200486
User
Feb 20, 2007, 2:30 PM
Post #3 of 25
(1972 views)
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Re: 95 ford mustang runs on 4 cylinders
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its not spam i just copied and past from another forum that put loose links in it when i posted it
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DanD
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Feb 20, 2007, 3:22 PM
Post #4 of 25
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Re: 95 ford mustang runs on 4 cylinders
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This “red spark” is it on all cylinders or just the two that are not running. The two cylinders that are not running are they on the same coil in the coil pack?
One and five, two and six, three and four are how they’re paired.
Dan.
PS: sorry about the spam comment.
Canadian "EH"
(This post was edited by DanD on Feb 20, 2007, 3:23 PM)
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vw200486
User
Feb 20, 2007, 3:25 PM
Post #5 of 25
(1967 views)
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Re: 95 ford mustang runs on 4 cylinders
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3 and 6 have no spark at all and the others have the red spark, maybe its orange
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vw200486
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Feb 20, 2007, 3:32 PM
Post #6 of 25
(1964 views)
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Re: 95 ford mustang runs on 4 cylinders
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i mean 3 and 4
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DanD
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Feb 20, 2007, 3:52 PM
Post #7 of 25
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Re: 95 ford mustang runs on 4 cylinders
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Check the ignition wires that they are not mixed and that they are not open; test with an ohmmeter.
With you saying that the two cylinders not getting spark are on two different coils, tells us that the computer is capable of firing the three coils so it’s not a control issue.
With this system it’s real important that the paired cylinders secondary ignition components are in good shape for example if numbers two and four secondary ignition wires or spark plugs are open you could in theory lose spark on three and six.
This coil you replaced was it a new coil or was it a previously enjoyed (used) one?
Dan.
Canadian "EH"
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DanD
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Feb 20, 2007, 3:54 PM
Post #8 of 25
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Re: 95 ford mustang runs on 4 cylinders
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Ok ignore what I just posted or at least some of it. LOL
Canadian "EH"
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DanD
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Feb 20, 2007, 3:59 PM
Post #9 of 25
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Re: 95 ford mustang runs on 4 cylinders
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Everything I said about the secondary ignition components still stands; you could try switch plugs around and see if the loss in spark follows a spark plug.
Or better yet test for spark right at the coil terminals of three and four; test both towers at the same time.
Dan.
Canadian "EH"
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vw200486
User
Feb 20, 2007, 3:59 PM
Post #10 of 25
(1959 views)
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Re: 95 ford mustang runs on 4 cylinders
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all the parts i replace wer brand new except the pcm
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vw200486
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Feb 20, 2007, 4:04 PM
Post #11 of 25
(1958 views)
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Re: 95 ford mustang runs on 4 cylinders
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i also noticed that the 1 of the 3 yellow wires were not flashing when i put a test light in the connection im guessing it the on for cylinders 3 and 4
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DanD
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Feb 20, 2007, 4:25 PM
Post #12 of 25
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Re: 95 ford mustang runs on 4 cylinders
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Start checking the primary wiring for opens, pushed out terminals in the connectors of the module or the computer.
This may take hands on to find the problem but here's a partial wiring diagram showing the coil, ignition module and a bit of the computers terminals.
Dan.
Canadian "EH"
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vw200486
User
Feb 20, 2007, 4:52 PM
Post #13 of 25
(1952 views)
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Re: 95 ford mustang runs on 4 cylinders
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i dont know if this helps but there was voltage at the wire that wasnt flashing . the test light came on but it did not flash
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DanD
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Feb 21, 2007, 6:33 AM
Post #14 of 25
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Re: 95 ford mustang runs on 4 cylinders
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It’s starting to sound like there’s an open in the yellow/red wire between the coil pack and ignition module or a bad module?
If you were to back probe the yellow/red wire at the ignition module, do you still have power there with the ignition in the run position or cranking?
What’s happening with the other two coils during cranking is that when the module grounds the yellow/black (coil 1&5) or the yellow/white (coil 1&6) the voltage drop across the coils primary windings is using up all the available voltage and the test light goes out.
For some reason that isn’t happening with coil 3&4 that’s why I’m thinking that there isn’t a good connection or a break in the wire between that coil’s primary windings and the ignition module or the module is bad.
So check whether there’s power on the yellow/red at the module?
You can use a safety pin or a paper clip as a back probe to slide between the wire and the back of the module’s connector. Slide the pin in far enough that you know that you’re touching the actual terminal inside the connector. Try not to use the pointed probe of your test light and poke a hole in the wire’s insulation. Yes it’ll give you a quick answer as to whether there’s power but you’ve now exposed the wire to the weather; it will corrode and give you more problems in the future.
Dan.
Canadian "EH"
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vw200486
User
Feb 21, 2007, 9:46 AM
Post #15 of 25
(1944 views)
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Re: 95 ford mustang runs on 4 cylinders
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alll the tests ive been doing when the car is running, but the thing idles like its running on 6 cylinders, srry i didnt get back to you earlier it got to dark her and couldnt see the wires...lol
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vw200486
User
Feb 21, 2007, 3:58 PM
Post #16 of 25
(1940 views)
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Re: 95 ford mustang runs on 4 cylinders
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ok there is power to the yellow red wire while its running but unlike the others there is no flashing to excite the coil to produce spark
thers also a pink wire on the modual tha does not have any power at all.... i think it cal SPOUT on the wiring diagram. so what do i check next.
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DanD
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Feb 21, 2007, 4:15 PM
Post #17 of 25
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Re: 95 ford mustang runs on 4 cylinders
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Is the module the new one or the original?
Regardless of which I would try another if that doesn’t do it we may have to call in the big guns and get Way2old involved because I’m running out of ideas.
Oh Tom we may need your help here!!!!!
Dan.
Canadian "EH"
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vw200486
User
Feb 21, 2007, 4:23 PM
Post #18 of 25
(1937 views)
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Re: 95 ford mustang runs on 4 cylinders
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i pulled te moduaal out of a running mustang my friend had and if i were to buy a new 1 it would be like 500 bucks i disnt even pay that much for the car
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way2old
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Feb 21, 2007, 5:57 PM
Post #19 of 25
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Re: 95 ford mustang runs on 4 cylinders
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I am reading this thread with lots of interest. Just to humor an old man, are the plugs in good shape? If all the coils are outputting weak spark, it either has to be PCM, Module or a ground problem. I have seen sensors short internally to ground and cause wierd running or no start problems. I will keep thinking and research it and will add more as I am sure of things. Good job so far Dan and to vw200486, it is good to work with someone that is willing to follow advice.
Being way2old is why I need help from younger minds
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vw200486
User
Feb 22, 2007, 12:32 PM
Post #20 of 25
(1928 views)
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Re: 95 ford mustang runs on 4 cylinders
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im gonna borrow a scanner from a friend and ill get back to you guys
oh i also noticed that the battery light was on but the alternator is charging fine
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vw200486
User
Feb 23, 2007, 9:51 AM
Post #21 of 25
(1920 views)
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Re: 95 ford mustang runs on 4 cylinders
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i was wondering if you have anymore of those wiring diagrams
on the car it looks like theres 2 grounds missing on g100
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DanD
Veteran
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Feb 23, 2007, 10:14 AM
Post #22 of 25
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Re: 95 ford mustang runs on 4 cylinders
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I’m not sure what you’re asking the diagram above show’s G100; a different diagram isn’t going to show you anything different?
Dan.
Canadian "EH"
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vw200486
User
Feb 23, 2007, 2:34 PM
Post #23 of 25
(1916 views)
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Re: 95 ford mustang runs on 4 cylinders
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ok friend wouldnt let me borrow the scanner but..... i noticed the icm droped a cylinder and now the car dosnt runn at all so im thinking i gotta fork out the money for a new icm... i put the old one on and it was back to firing on 4 cylinders so ill get back to ya guys when i put another one on
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vw200486
User
Mar 20, 2007, 4:18 PM
Post #24 of 25
(1880 views)
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Re: 95 ford mustang runs on 4 cylinders
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well i put a new icm on the peice of crap and the thing still runs on 4 cylinders im about to give up
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vw200486
User
Mar 22, 2007, 11:18 AM
Post #25 of 25
(1873 views)
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Re: 95 ford mustang runs on 4 cylinders
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i was just told that it could be the harmonic balancer if its cracked or damaged it could make it run on 4 cylinders....what do you think?
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