idle\misfire\bogging issue. help - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 48 Old 05-17-2017, 09:17 AM Thread Starter
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Unhappy idle\misfire\bogging issue. help

Hey guys. My name is Derrick, Im new to the forum and I was told by a lot of people to try this site for some help because I live in a "Chevy owned town" and nobody really cares for Ford's around here lol

My issue is that I have a 94 mustang that was originally a v6 but the previous owner did a 5.0 swap. From what I was told the engine was stroked to a 331 and has a cam upgrade. He couldn't really tell me what the cam is or anything just that the motor, 5 speed Manuel transmission, and rear end is out of a 88 mustang GT. He spun the car out and locked up the brakes and a couple days later the fuel lines that ran down the passenger side wheel well had melted and the car basically caught fire.

And with that said. When I got the car it wasn't running at all so I basically took a leap of faith.... Towed the car home and checked the sensors and the rest of the lines on the passenger side of the car and the only other thing that was damaged in the fire was the connector for the code reader, that of witch im planning on changing as soon as I can.

The car ran great for a few weeks after I repaired the fuel lines and the vacuum lines. Over last weekend I wanted to do a tune up on the car and checked the cap and rotor and they looked like new. Got new plug cables and spark plugs for the car. Plugged them in one by one so there would be no mix-up on what goes where. It started to run like a Beast! I was so happy. Drive it around for the day, Shut it down and called it a night. Next morning I had to bring my girl to work and as we were leaving I started to notice something wasn't right. As I accelerated I couldn't give it more the 1/4 throttle or it would begin to stutter and bog down, so when I dropped her off I checked my plugs to make sure that the plugs didn't come loose and checked the cables and all was good....

When i accelerate the car has a really had time with getting past 2000+ rpm.
So I thought "hey let's put the old ones back in see what happens" the same thing happened. I got new tps, cable and plugs, air filter, mass air flow sensor.

I am so stumped right now:shrug: I cleaned and checked the iac, the tb, the egr valve and nothing changed. So please if you can, help me out! Thank you so much for having me here! "I have videos of how it ran before and how it runs now if that will help any!"

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post #2 of 48 Old 05-17-2017, 09:18 AM Thread Starter
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This is how it was when I first got it running.


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post #3 of 48 Old 05-17-2017, 09:19 AM Thread Starter
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post #4 of 48 Old 05-17-2017, 09:20 AM Thread Starter
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this is how it became the next morning after the tune up

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post #5 of 48 Old 05-17-2017, 09:21 AM Thread Starter
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the only new parts that i put on the car is spark plugs and the tps. the coil came from a known running vehicle. changed the tps because if i unplugged it the car had no change in how it ran before this issue arose. this is what the spark plud looked like after i drove it that next day.
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Last edited by zax90; 05-17-2017 at 09:24 AM. Reason: needed to add info
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post #6 of 48 Old 05-17-2017, 09:24 AM
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since there are so many possible problems

scan codes
check fuel pressure

report back
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post #7 of 48 Old 05-17-2017, 09:25 AM Thread Starter
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this is the fuel pressure test i did yesterday. it averaged around 40 psi until i gave it throttle then it would drop. idk if it should or not

Last edited by zax90; 05-17-2017 at 09:28 AM. Reason: for got to add info
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post #8 of 48 Old 05-17-2017, 09:26 AM Thread Starter
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the codes for the CEL and here they are.

10
111
552
553
558
565
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post #9 of 48 Old 05-17-2017, 09:29 AM Thread Starter
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this is what it does if i try to hold a certain RPM
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post #10 of 48 Old 05-17-2017, 09:30 AM Thread Starter
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im sorry if im posting too much at once. im just trying to get all of the information out that i can so i can give the best understanding for the situation

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post #11 of 48 Old 05-17-2017, 09:34 AM Thread Starter
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well. I was looking around the engine because i was curious about something.... what is the possibility of a bad ground causing these issues? I'm asking because i did a bit of research and I for the life of me cannot find the strap from the back passenger side of the block to the frame/body.... so I'm slight worried about that because every time i have gotten out of the car before the current issue arised i would put my hand towards the bottom of the body/frame i would get a slight shock every time.... :thinking: this is all out of curiosity and off the top of my head..... thanks y'all
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post #12 of 48 Old 05-17-2017, 09:52 AM
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Quote:
Originally Posted by zax90 View Post
the codes for the CEL and here they are.

10
111
552
553
558
565
what about engine running codes??

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #13 of 48 Old 05-17-2017, 09:55 AM
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plugs mean nothing

in order to diagnose you need to be systematic, throwing all this info is not going to help

so try to answer the questions you are given

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #14 of 48 Old 05-17-2017, 09:57 AM
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do you have an exhaust on that?

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #15 of 48 Old 05-17-2017, 10:01 AM Thread Starter
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I have a aftermarket X pipe with flowmaster 40s coming from Mac headers no cats.
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post #16 of 48 Old 05-17-2017, 10:14 AM
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next thing after you do above

make a video just like the one with the FP gauge

this time, remove the vac line to the fuel press regulator

cap the end at the manifold, leave the reg port open, rev it a little and let it idle, keep an eye on the open port on the reg for possible fuel coming out.

also tell us exactly where the vac line for the reg goes to on the manifold.

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #17 of 48 Old 05-17-2017, 10:15 AM Thread Starter
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I apologise for rushing in with everything. I just thought it would be of use
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post #18 of 48 Old 05-17-2017, 10:20 AM Thread Starter
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Ok will do Indy. I greatly appreciate your help. I will do this test right when I get off work.
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post #19 of 48 Old 05-17-2017, 01:19 PM Thread Starter
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Quote:
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also tell us exactly where the vac line for the reg goes to on the manifold.
the vac line that the fpr is connected to is the located the backside of the intake where a stem is coming off close to the where it becomes the throttle body. but for some reason it was split to the EGR and FPR and also my intake has fewer vac ports compared to what i see on normal intakes. usually the tree has a 3-way valve where mine has a 1 way valve
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post #20 of 48 Old 05-17-2017, 01:25 PM Thread Starter
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its this stem but mine is a single for some reason.
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post #21 of 48 Old 05-17-2017, 01:57 PM
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On the"after tune up" video I hear a large vacuum leak, What is on the front passenger side of the intake? Looks like an open vacuum line?

347 Stroker/ TW170 heads /TrickFlow R intake/ FordStroker cam/Longtubes
The thick CLOUD of tire smoke ,the SMELL of burning rubber,and the CHEER of the crowd ....PRICELESS.
$90.00 fine for an awesome burn-out,worth every penny...
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post #22 of 48 Old 05-17-2017, 02:08 PM Thread Starter
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I gotta plug the outlet on the Cai if you can notice it on the side towards the engine
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post #23 of 48 Old 05-17-2017, 02:16 PM Thread Starter
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also the previous owner didn't reconnect the EGR coolant hoses. so idk if that would cause any issues with the car...
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post #24 of 48 Old 05-17-2017, 02:22 PM
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Welcome! Noticed the air filter, did you happen to recently clean that? I have a k&n, and from time to time i get fuzzies on the elements in the maf. Throws it way out of wack! Studders , stampers, no power.
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post #25 of 48 Old 05-17-2017, 02:30 PM
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If that inlet fitting is open, drawing in air that is a problem. Unmetered air will throw the air/fuel ratio off.
EGR coolant hose not a big issue.

347 Stroker/ TW170 heads /TrickFlow R intake/ FordStroker cam/Longtubes
The thick CLOUD of tire smoke ,the SMELL of burning rubber,and the CHEER of the crowd ....PRICELESS.
$90.00 fine for an awesome burn-out,worth every penny...
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post #26 of 48 Old 05-17-2017, 02:36 PM Thread Starter
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Quote:
Originally Posted by Papiokidd View Post
Welcome! Noticed the air filter, did you happen to recently clean that? I have a k&n, and from time to time i get fuzzies on the elements in the maf. Throws it way out of wack! Studders , stampers, no power.
no sir. i actually just replaced it and used Mass air Cleaner on the mass air flow sensor.
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post #27 of 48 Old 05-17-2017, 02:41 PM Thread Starter
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Quote:
Originally Posted by theYman View Post
If that inlet fitting is open, drawing in air that is a problem. Unmetered air will throw the air/fuel ratio off.
EGR coolant hose not a big issue.
okay ill make sure to plug it. for some reason the prev owner had that outlet plugged to the outlet on the valve cover where the oil cap is. maybe putting it back on there might help instead of it being connected to the throttle body and plug the throttle body outlet?
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post #28 of 48 Old 05-17-2017, 03:28 PM
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I would plug the intake tube fitting and leave the fill tube hose connected to the TB.

347 Stroker/ TW170 heads /TrickFlow R intake/ FordStroker cam/Longtubes
The thick CLOUD of tire smoke ,the SMELL of burning rubber,and the CHEER of the crowd ....PRICELESS.
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post #29 of 48 Old 05-17-2017, 03:33 PM Thread Starter
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ok kewl
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post #30 of 48 Old 05-17-2017, 07:44 PM
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did you make a vid of vac line off of the reg??

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #31 of 48 Old 05-17-2017, 08:42 PM Thread Starter
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About to do that now.
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post #32 of 48 Old 05-17-2017, 09:15 PM Thread Starter
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post #33 of 48 Old 05-17-2017, 10:07 PM
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Do a smoke test on the intake. I was positive I had no vacuum leaks. low and behold they showed up on the smoke test. plenty of videos on youtube show you how to do it and how to make one. I literally made one in 15 minutes out of stuff in the garage.
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post #34 of 48 Old 05-17-2017, 10:24 PM Thread Starter
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I can't get a good reading on the timing because the idle isn't always consistent so.....
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post #35 of 48 Old 05-17-2017, 10:29 PM
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reg looks okay at idle

your reg was reacting to changing manifold press, normal

timing check should not be a problem even with idle issue, hence the strobe light

just to let you know,

even if everything checks out, a 331 engine with 302 engine management may not play nice.

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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