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Old May 10th, 2009, 12:15 AM   #1
mrclean
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Default Looking for a Ford Tech that is good with the 4.6L V8's

A friend of mine has a 00 Mustang Gt with the typical 4.6 in it. We've tried many different things but can't seem to get a missfire to quit from happening. I'm looking for someone in the Waterford/Clarkston area that can possibly help out and at least diagnois this for us. If you want to know more of the particulars about this, pm me. Of course we are willing to pay a diagnostic fee.

Thanks for any and all help
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Old May 10th, 2009, 12:18 AM   #2
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You will need to list all that is known including what you have tried and the outcome.

I always register to a forum of that particular car that is having the problem and search there about the problem. You can usually find the answer there.

You might even get the answer here, but it sounds like you dont want to pay a shop to diagnose it if you can bypass it and that is why I suggested the above, do it yourself diagnosis.
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Old May 10th, 2009, 12:20 AM   #3
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Start with checking the fuel pressure, just to rule it out.

And also check the battery voltage when car is off and also running.
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Old May 10th, 2009, 10:49 AM   #4
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it that COP? (coil on plug)

is there any misfire codes?
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Old May 11th, 2009, 11:42 AM   #5
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make sure there motorcraft spark plugs!!! no COP on the 4.6 they didnt do that till 01 or 03 i belive...my 4.6L in my truck kept missin after i changed plugs put in bouch misfire...put in autolite...missfire. changed coil packs wires and plugs to motorcraft truck hasnt missed since then. The triton motors are very picky about plugs. id also do a fuel filter too.
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Old May 11th, 2009, 06:56 PM   #6
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make sure they're Motorcraft spark plugs!!!
True they are finicky, not sure why. '98 was the last year of the traditional coil design, 99-current Mustangs used coil on plug. They are a known problem, but I would guess you already tried that. I know a good tech who lives in Grand Blanc, I'll see if he's interested in making a road trip and let you know.
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Old May 12th, 2009, 08:10 AM   #7
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True they are finicky, not sure why. '98 was the last year of the traditional coil design, 99-current Mustangs used coil on plug. They are a known problem, but I would guess you already tried that. I know a good tech who lives in Grand Blanc, I'll see if he's interested in making a road trip and let you know.
Thanks! Any help is appreciated. The car is a 4.6L 5-speed with a cold air intake and cat-back exhaust with 112k on it.
As far as what we have done, this is what has been checked/done so far. 8 new coils and factory spark plugs. New #2 injector connector (old one was loose and would not clip onto the injector fully). Also scanned the mass air read out, 02 sensor readings, and checked for any missfire data with a Snap On scan tool. The miss can be felt at idle, but will not set a check engine light and is not leaving anything behind as any such history code. The miss is felt best when driving. Almost like a cylinder is cutting in/out. Even tried the old trick of spraying starting fluid on the vac. hoses and around the intake to check for any leaks and nothing. Fuel pressure is in spec (new fuel pump due to no start issue). Only thing that I can say appears "odd" is that it is harder to put the passenger side spark plugs in versus the driver's side. It appears the intake manifold for some reason, seems to be moved over just a touch making it hard to get the plugs in/out.

Basically at this point the owner and myself are tired of taking "an educated guess" at it. We are looking for someone that would consider doing some side work and is familar with the 4.6 in these cars. We DON'T MIND PAYING A DIAGNOIS FEE. I wouldn't expect to not pay someone for their time/effort.
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Old May 12th, 2009, 09:27 AM   #8
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check fuel psi at the rail and if its low a new fuel filter it almost sounds like the injectors are dirty because its not sending a code. you can take the injectors out and clean them with TB cleaner or get some lucas fuel addtive to clean out the whole system id do both thoe i ran some fuel cleaning stuff threw and then i took the injectors off they were all nasty.

humm if a cyl feels like its not there do a compression test to make sure they are all within specs and all of them are around the same PSI i belive its 130-180psi is the range but normaly they'll all be in a 20psi range when i did it on my 4.6L with 105,000 miles i had 138-145 psi compression ranging on the diff cyls.

also it prob wouldnt hurt to pull a few plugs witch youd have to do anyways to do compression test and see what color the tips are.

wait i had the same prob at 112,000miles my driver side upstream o2 senor stoped working my truck ran like a miss no codes i pulled all 4 pulls on the driver side soild black from to much fuel the ones on the passenger were normal greyish color....your over 100,000 miles id give o2's a shot and if nothing else they'll help your mileage they helpd my truck otu 2-4 more mpg's and it stoped that miss feeling
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Old May 12th, 2009, 10:07 AM   #9
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check fuel psi at the rail and if its low a new fuel filter it almost sounds like the injectors are dirty because its not sending a code. you can take the injectors out and clean them with TB cleaner or get some lucas fuel addtive to clean out the whole system id do both thoe i ran some fuel cleaning stuff threw and then i took the injectors off they were all nasty.

humm if a cyl feels like its not there do a compression test to make sure they are all within specs and all of them are around the same PSI i belive its 130-180psi is the range but normaly they'll all be in a 20psi range when i did it on my 4.6L with 105,000 miles i had 138-145 psi compression ranging on the diff cyls.

also it prob wouldnt hurt to pull a few plugs witch youd have to do anyways to do compression test and see what color the tips are.

wait i had the same prob at 112,000miles my driver side upstream o2 senor stoped working my truck ran like a miss no codes i pulled all 4 pulls on the driver side soild black from to much fuel the ones on the passenger were normal greyish color....your over 100,000 miles id give o2's a shot and if nothing else they'll help your mileage they helpd my truck otu 2-4 more mpg's and it stoped that miss feeling
I didn't personally check the fuel pressure at the rail, but was told by him that he did and it was fine One part that does bother me is that he did put in the new fuel pump, but didn't change the fuel filter because he couldn't get it off. He said it looked fairly new and with what he said was an accurate reading and good psi at the rail, I would say that the filter isn't plugged but would like to see it changed anyways.

When we pulled the plugs, there was no great difference from one bank to the other. The only thing I saw worth mentioning would be that the driver's side plugs looked like they where running a little bit leaner because they had an orange tinge. I'm beginning to think an 02 sensor as well.

He had a similar problem when he first got the car but at that time it showed a check engine light and had a cylinder #2 missfire. He ended up putting in a set of Granatelli Coils in it and it solved the problem. How do these motors take to aftermarket coils??
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Old May 12th, 2009, 11:17 AM   #10
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from what ive heard on my F150 site motorcraft coils or global coils globals are only like 87 with free shipping for all 8 and no one on there has a prob. i think the MSDs worked good but the accel are crap and guys had lots of probs with them.

id run a compression test if you get bord but if it were me id do the upstream o2's frist then go from there i have a feeling thats what it could be.

also do a fuel volume test as well it could have good PSI but if that filter is plug it might not flow very well what you do with a volume test is you leave the bleeder on the fuel pressure tester open and put it in a clear 1 liter bottle and it should fill about a 1/4 of the bottle in about 10-15 seconds i belive.

im still leaning towards o2's.

lean=to much air not enogh fuel so the o2 might not be working right so the driver side isnt getting as much gas as it needs or the injectors/fuel filter are dirty....past that i dont know but id start with the o2's do both at the same time and go from there with the other tests ive told you to do.

good luck. im in farmington hills im about 20 miles away from you im free most nights past 6 and the weekends when i dont go up north i have nothing going on. if you want i could swing by and give yall a hand with the tests and what not and even install parts if you want.

when he tryed to change the fuel filte did he have the proper fuel line tools? if not i have a few diff. sizes sometimes they are a PITA to get off.
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Old May 12th, 2009, 12:09 PM   #11
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Can you be in Dearborn at 3:30pm tomorrow(5/13), Southfield Fwy and Oakwood Blvd area? I'll hook up the IDS (Ford diagnostic tool) to it, we can drive around the complex here and see if I can pick up which cylinder it's on and any codes that might be pending.

On-car diagnosis is what I do, and the engineers would LOVE for me to get some "real world" time on the tool.

PM me and I'll get you my cell phone number, plus directions if you can make it out. No charge, unless you really want to.
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Old May 12th, 2009, 12:47 PM   #12
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Can you be in Dearborn at 3:30pm tomorrow(5/13), Southfield Fwy and Oakwood Blvd area? I'll hook up the IDS (Ford diagnostic tool) to it, we can drive around the complex here and see if I can pick up which cylinder it's on and any codes that might be pending.

On-car diagnosis is what I do, and the engineers would LOVE for me to get some "real world" time on the tool.

PM me and I'll get you my cell phone number, plus directions if you can make it out. No charge, unless you really want to.

Pm sent
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Old May 12th, 2009, 12:55 PM   #13
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fwiw you can have a plugged fuel filter and still have fuel pressure read good.......its the fuel volume your gonna loose.
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Old May 12th, 2009, 01:45 PM   #14
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fwiw you can have a plugged fuel filter and still have fuel pressure read good.......its the fuel volume your gonna loose.

Thanks for the tip. I'll pass it on to him and have him get off his lazy a$$ and change it already
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Old May 15th, 2009, 05:19 PM   #15
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The guy I know is out of town for a while. Looks like you have a line on the diag though. Let me know if I can help you out on the parts end, you have my number. Good luck!
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