Engine Miss

[the on going reality of shopower]

ok well last week I was driving my 93 SHO ATX and it started missing really bad, And it takes for ever to get up to speed.

Well I have 2 things here on the scanner
02 sensor codes and did the clyinder test and 2,3 cylinders are missing
anyone with suggestions. The plugs and wires are new from ford and no smoke comming from exhuast. I can not hear fuel injector 2,3 working
has anyone had a fuel injector go with no warning??? Well just checking before i ripp the intake off and change the injectors.

 

[billyshoe]

Washed the car lately? Big rain? If the windshield/hood gasket is ill fitting it will allow water to get in the plugwells new wires or not.

 

[the on going reality of shopower]

well i checked them all and re gaped the plugs and no i did not drive in rain.
I try not to drive in rain. Not a winter driver either.
So tis would not explain the 2,3 injectors not working anyway.
I checked ground wires and found one off at back passenger side of intake put connected it and no change. Is this a main ground could the pcm be screwed???

 

[RedDiabloStang96]

Check your ignition coil and module

Hey,
Check your coil and ignition module. That would cause all of the symptoms you listed!
--Brian
P.S.
How can you hear an injector working? Are you using a stethoscope? Just wondering!

 

[SHO Type U]

you mentioned that u regapped your plugs, did u place the plug wires in the proper order? check it.

 

[the on going reality of shopower]

i did it one by one and it was running the same before i did the gap.
well for the moduale i changed it from my 92 intake i got and runs the same
well i used a stethascope to hear the injectors. Well next week me and my boss are going to look at the wiring and rule out the computer or wiring. if nothing then going to do the injectors and 60k at the sametime. But for now i got the 91 + on the road to get me around so no bigg rush.

 

[RedDiabloStang96]

Well....

Hey,
Well, if it's not the ignition module, then I guess it would have to be the fuel injector. U didn't mention in your last post if you checked the coil, but I'm guessing you probably did. That is a very strange occurence though! I've never heard of an injector just "failing"-point blank! Hmm! Well, I don't have any more ideas!!! I'm gonna keep thinking about this one! Good luck in the mean time!
--Brian

 

[the on going reality of shopower]

hey buddy thanks for the tips but i hope i find it
i miss my baby the 91+ is wearing me out always shifting and so on.
well if you think of anything let me now i could use some tips from fellow sho owners as ther is next to none around here that have any or knowledge on
these fine cars.

 

[RedDiabloStang96]

Hey,
How long after the new plug wires did this problem start? You may want to check the firing order. The Chilton's firing order is wrong. Mike from MidwestSHO posted the firing order in another message:

On the Block:

|1 2 3|
|4 5 6|

Coil:

|5 1|
|6 2|
|4 3|
I'm really NOT trying to make you sound stupid! I'm just so stumped about this problem! I keep telling myself a misfire can only be caused by lack of spark and/or fuel. If the module is good, the coil is good, and the fuel pump is good, then that leaves the fuel injectors (and the pressure regulator, which almost never fails), the wires (or their routing), and the spark plugs. If the spark plug wires were routed to follow the Chilton's manual, the firing order will be wrong (or so I've been told), though mine is right.
--Brian

 

[the on going reality of shopower]

Well this problem started one day after I took her in for a oil change at the dealer. The mech sprayed the bottom of the engine to clean it off from the oil spill from the filter and drove home and back to work so 130k and started on the way home from work. I raced one guy with a Jetta VR6 and after that it started, Also I ran it really low on gas so maybe a clogged injuector???

The plugs and wires are 1 year old and never had a problem with them.
They are motocraft wires with motocraft plugs so I suspect they are good,
plug wells are bone dry.
I am really suspecting fuel injectors or wiring, computer.
Thanks

 

[RedDiabloStang96]

You ran it out of gas?

Hey,
You ran it low on gas? Did it stall out (run completely out of gas). Every time I ran it out of gas, it always started in second gear later. I don't know if you have yet or not, but unplug the battery, and hold the brakes for 60 seconds. This will clear the computer (you don't want to just clear the codes. That never worked for me with the running out of gas problem). That always fixed the problem. Try this, put it in first gear (manually), and try driving. Does it accelerate any better?. Is it any better? If it isn't, then it probably is a clogged fuel injector. And the games go on!!! I hope I helped this time!
--Brian

 

[the on going reality of shopower]

Well its at work now so I will try tomarrow.
I did not run outta gas this happened about .5 hour later
after I got gas. Since then I have changed my filter
put a can of injector cleaner. Ran the gas I got out of the tank
and filled it up with Ultra 94 from Sunoco.
So also when i unplug the MAF it runs the same.
Thanks for helping you are the only one on this forum to do so.

 

[RedDiabloStang96]

I am soo stumped!

Hey,
I have got NO idea what the heck is going on! This is one very freaky problem! Let me look through some of my ford "how the **** does the computer and sensors work" books, and let me get back to you if I find something! Otherwise, I hope it's just something stupid we're all just looking over! And, I am glad to help another SHOer if I can! It's actually kinda fun! I like challenges! Anywho, sorry I haven't been able to help you yet! I'll get back to you!
--Brian
P.S.
Here's some of my logic:
1. If your comp. said 2 and 3 are missing/weak, there should be smoke if it was an ignition problem.
2. If your comp. said O2 problems, your gas mileage would suck. Which O2 codes were you getting. If the O2 was saying that the air/fuel ratio was way too rich, the ecm would retard the timing drastically. If it's voltage is too high or out of range, the computer goes into "limp home" mode. It does this to restrict you from doing basically ANYTHING that might hurt the engine. The computer controls absolutely EVERY aspect of the engine. So, you may want to check your O2 sensors. Other than that, I'm SO LOST!
If there is no smoke, you are either running running lean and the computer is in limp home mode, or the computer thinks you are running rich and removing a bunch of fuel to lean out the mixture a bit. Your piston rings may be getting pretty scared!
I'll keep thinking about it.

 

[the on going reality of shopower]

hey i got a O2 sensor code but never thought it would do what you said i am going to change it and go from there. I hope this is going to work it kinda makes sense in the words you wrote.
I will tell you tomarrow By the way the stealer ship sprayed water under the engine maybe the O2 connection got water and went green

 

[RedDiabloStang96]

Sweet!

Hey,
I really hope this works! Let's keep our fingers crossed!
--Brian

 

[the on going reality of shopower]

hey well I am really hoping this works
I want to get the 60k under way so I can cruise with the Sho
Club in Ontario and maybe head up to Quebec for the SHO vs GTP show down
well thanks and will let you know after I am done work.( 7pm EST)
thanks

 

[masho95]

When you pulled the codes, was it both O2 sensors that codes came up for, or just one? Also most likely this isn't a clogged injector problem, there is a fuel filter on the fuel pump itself and you have the inline fuel filter near the right rear tire.

 

[the on going reality of shopower]

i am really ****** off at this i want to sell the thing.
i pay for it and insure it for looks i guess
I dis connected the O2 sensors and ran the same.
I never started this car for a week and i ran it today and it automaticly ran like crap so something is wrong. It starts no problem, i ran the codes and there was nothing. But if i drive it for 10min O2 sensor comes up.??????????????????

 

[masho95]

Is there a code for only ONE O2 sensor coming up? Sounds like you have multiple problems. Start by eliminating the O2 code by replacing it if it's just one code. If both O2 sensor codes come up it's probably something else causing it to throw the codes.

You've already stated that you don't hear the #2 and #3 injectors firing. Start your troubleshooting of the rough running with that. If those 2 cylinders aren't getting fuel obviously the car is going to run like crap. Now that I think about it, is your O2 code saying you are running lean? Perhaps it's related to the #2/#3 injectors not shootin fuel?

 

[RedDiabloStang96]

Damn!

Hey man,
I'm really sorry! I have no clue what is going on! Unfortunately, I am having so many problems of my own rebuilding my mustang's transmission, I haven't had much time to think about it! I'll get back to you if I think of anything else! Good luck! Don't get too crazy though! You'll figure it out!
--Brian