idle\misfire\bogging issue. help - Page 2 - Ford Mustang Forums : Corral.net Mustang Forum
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post #36 of 48 Old 05-17-2017, 10:37 PM
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just went through you 3 first vids

what you have is exactly what you should expect

it should get progressively worse

that is how a efi will react as it learns wrong, from incorrect info.

having a cold start, hot start, repeated starts.........will ALL be different

I am sure your fuel trims would show this

your setup is so far from stock, and fairly 'butchered' up

that you need to be very competent in diagnosing it

I believe your are in for a real dose of frustration with that thing

fox TB, hot air intake, cut out emission equip, who know what else.......

at this point, get it to operating temp, and check 02 voltages,,,,,,see if it is stuck lean or rich.....

then move from there..


89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #37 of 48 Old 05-17-2017, 11:52 PM Thread Starter
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just went through you 3 first vids

what you have is exactly what you should expect

it should get progressively worse

that is how a efi will react as it learns wrong, from incorrect info.

having a cold start, hot start, repeated starts.........will ALL be different

I am sure your fuel trims would show this

your setup is so far from stock, and fairly 'butchered' up

that you need to be very competent in diagnosing it

I believe your are in for a real dose of frustration with that thing

fox TB, hot air intake, cut out emission equip, who know what else.......

at this point, get it to operating temp, and check 02 voltages,,,,,,see if it is stuck lean or rich.....

then move from there..
Okay I will do my best. It's just confusing because my only thought is how did it just happen over night.... All I did was change the spark plugs and wires because i didn't know when the last time they were? changed. And it ran good for about two months before I ordered the plugs and ect..... But I don't want to dwell on it. Im just going to do my best. and once again I just want to say thank you all for your help

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post #38 of 48 Old 05-18-2017, 12:38 AM
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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.
Looks like you were running rich, then really lean.
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post #39 of 48 Old 05-18-2017, 09:43 AM
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Okay I will do my best. It's just confusing because my only thought is how did it just happen over night.... All I did was change the spark plugs and wires because i didn't know when the last time they were? changed. And it ran good for about two months before I ordered the plugs and ect..... But I don't want to dwell on it. Im just going to do my best. and once again I just want to say thank you all for your help
run a cyl balance test once fully warmed

if it ran 'good' for two months, why change plugs and wires?

you probably thought it would run better, is my guess?

here in lies the problem, wth how subjective one feels their car runs.

i can tell from your first vid, it doesn't run right, its choopy, and cannot stabilize idle would be interesting to see manifold press at idle

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #40 of 48 Old 05-18-2017, 10:36 AM Thread Starter
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if it ran 'good' for two months, why change plugs and wires?

you probably thought it would run better, is my guess?

here in lies the problem, with how subjective one feels their car runs.
like i said in the earlier posting. i wanted to get things cleaned up because i didn't know when the last tune up was done. the boots looked dry rotted and the were crumbling when i grabbed them. i've just been trying to restore the engine bay and motor, checking sensors, wires, connectors, hoses and whatever else i can just to restore it to what it at one time was.

is there a possibility of the spark plug wires cross talking from being too close?

and i know with the first video it did run rough and i knew that, I was just happy to have it running because of how bad the fire was. but as i said i'm just trying to get it back to where it runs like it should.

i appreciate all the help you have given me indy.
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post #41 of 48 Old 05-18-2017, 02:23 PM Thread Starter
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also. i just noticed that this car has what looks to be a 94\95 mustang distributor.... i only noticed because i was told by a friend to check the module on the side of the dizzy and i became kinda baffled because it has the cables going straight into the dizzy instead of to a module. lol this is gonna be a challenge
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post #42 of 48 Old 05-18-2017, 03:15 PM
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I think you need to invest in a good wiring diagram for your vehicle.

Remind me again, why you took this car?

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #43 of 48 Old 05-18-2017, 03:31 PM Thread Starter
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Remind me again, why you took this car?
to be honest it was $500. capable of running. Body and interior are in descent shape. and the sn95's are actually my second favorite model of mustangs. I've always wanted a v8 with a 5 speed transmission.
I know I took a leap of faith but who knows.....
We all have a dream right?
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post #44 of 48 Old 05-19-2017, 12:50 PM
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Quote:
Originally Posted by zax90 View Post
also. i just noticed that this car has what looks to be a 94\95 mustang distributor.... i only noticed because i was told by a friend to check the module on the side of the dizzy and i became kinda baffled because it has the cables going straight into the dizzy instead of to a module. lol this is gonna be a challenge
Which EEC are you using? A SN95 or Foxbody?
I know the powertrain came from a Foxbody.

Sounds like you have the SN95 wiring harness though.

87 coupe 5.0EFI conversion, SN95 5lug,
95 GT, V1$-Trim, NoSlow5.0's Motorsports intake, TwEECer RT & etc...

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post #45 of 48 Old 05-19-2017, 01:00 PM Thread Starter
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Which EEC are you using? A SN95 or Foxbody?
I know the powertrain came from a Foxbody.

Sounds like you have the SN95 wiring harness though.
i was told that it was from a fox but the dizzy connector was crimped to the connecting cables...
i was going to look and see what i can tell about the eec. he gave me 2 of them. "idk why lol"
but i was also told that it may be the pick-up coil inside the dizzy

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post #46 of 48 Old 05-19-2017, 05:00 PM
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It could be a intermittent pip failure,

But if I remember correctly the TFI between the Fox and SN95 are different. The SN version is computer controlled dwell and the fox was a push start. I think.... it's been a long time.
Anyways, your TFI needs to be fully compatible with your EEC.

I don't think that is your main problem though.

87 coupe 5.0EFI conversion, SN95 5lug,
95 GT, V1$-Trim, NoSlow5.0's Motorsports intake, TwEECer RT & etc...

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post #47 of 48 Old 05-24-2017, 04:49 PM Thread Starter
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well guys i think i have "MAYBE" found the culprit... i just pulled the dizzy and i heard a clunk noise.... i looked at the dizzy and the gears pin that held it in snapped.... would this possibly be my issue? the thing that i'm confused about is that it would run. not well but it would run. but yesterday i tried to crank it and adjust the timing to see if that would help but no spark. would this cause the erratic numbers from the timing light that i mentioned in my previous post? btw the guy whom i bought the car from sent me to autozone to trade it in so thats $100 that i can save towards something else.
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post #48 of 48 Old 05-24-2017, 09:09 PM
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Yes.
If that gear doesn't turn, the reluctor & rotor doesn't turn, if they don't turn you don't get a PIP signal. Not to mention that it is out of time as well with a slipping dizzy gear.

87 coupe 5.0EFI conversion, SN95 5lug,
95 GT, V1$-Trim, NoSlow5.0's Motorsports intake, TwEECer RT & etc...

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