Idle issue still!! Replaced several parts.. looking for more ideas!!

Joshmack111 · Jun 5, 2020

Alright guys 93 5.0 high hanging idle and no power very sluggish... I've replaced the egr valve, and the idle air control, and checked the voltage on the tps and adjusted it lower at .96 now. Also checked the fuel pressure while off key in on position was at 35. Havnt done it while running yet. Built a smoke tester and didn't see any vacuum leaks accept for the egr before I replaced it. About to go crazy over here. What else should I be looking for. Maybe a vacuum leak somewhere else? Any ideas please.

KRUISR · Jun 5, 2020

Some other info on the engine combo. Is this totally stock or heavily modified? If modified, with what?

CarMichael Angelo · Jun 5, 2020

I cant tell you how to fix it, but Its spelled " idle" .
Start there, and maybe the "over 10th graders" will chime in to help.

Joshmack111 · Jun 5, 2020

Just bolt on stuff nothing major. Bbk 70mm throttle body, mass air meter, cold air intake. That's mainly it for the engine. Car has been sitting up for a while. Has fairly new plugs and wires. Been trying to get it back on the road. Cranks up no problem immediately goes to about 1500 rpms the after about a minute comes down to 1100. Never gets below that while just idling. If I drive it doesn't want to get below 2000. And feels down right slow..

Joshmack111 · Jun 5, 2020

CarMichael Angelo said:
I cant tell you how to fix it, but Its spelled " idle" .
Start there, and maybe the "over 10th graders" will chime in to help.

Ok thanks now how do I fix..

CarMichael Angelo · Jun 5, 2020

Press the edit button, or the three little dots in the lower corner to open the "edit"
feature.

Joshmack111 · Jun 5, 2020

Did that already was talking about the car.

redNfast · Jun 5, 2020

Joshmack111 said:
Just bolt on stuff nothing major. Bbk 70mm throttle body, mass air meter, cold air intake. That's mainly it for the engine. Car has been sitting up for a while. Has fairly new plugs and wires. Been trying to get it back on the road. Cranks up no problem immediately goes to about 1500 rpms the after about a minute comes down to 1100. Never gets below that while just idling. If I drive it doesn't want to get below 2000. And feels down right slow..

Are the parts matched or cherry picked here and there?

70mm throttle body that stock or go fast........er + " mass air meter, cold air intake" .......... might need a soft tune to make things work.

Computer managed engine controls are unlike the carb days. More demanding, mapping is precise .

Tried grabbing any codes from it?

Joshmack111 · Jun 5, 2020

No nothing cherry picked I've had the car for about 17 years I know all the parts that have been replaced, I did pull the codes and all it gave me was low voltage to the tps sensor I believe it was 63. Cant remember now. When I checked the voltage it was high, so I adjusted it down to about .96

General karthief · Jun 5, 2020

Start here:

Help me create the "Surging Idle Checklist"

Updated 26-Oct-2019 to clarify creeping idle RPM increase as the car is being driven. Many of you are familiar with the "Cranks OK, but No Start Checklist for Fuel Injected Mustangs" checklist and the No Crank Checklist. They are very effective in finding and eliminating the problems by use of...

forums.stangnet.com

Read it through, make sure you understand then start at the top and do it step by step, don't skip around.
You to be methodical when it comes to efi.
No, you do not need a 'soft tune'.
Maybe a 'tune up', but not a 'tune'.

nickyb · Jun 6, 2020

General karthief said:
Start here:

Help me create the "Surging Idle Checklist"

Updated 26-Oct-2019 to clarify creeping idle RPM increase as the car is being driven. Many of you are familiar with the "Cranks OK, but No Start Checklist for Fuel Injected Mustangs" checklist and the No Crank Checklist. They are very effective in finding and eliminating the problems by use of...

forums.stangnet.com

Read it through, make sure you understand then start at the top and do it step by step, don't skip around.
You to be methodical when it comes to efi.
No, you do not need a 'soft tune'.
Maybe a 'tune up', but not a 'tune'.

Agreed!

redNfast · Jun 6, 2020

General karthief said:
Start here:

Help me create the "Surging Idle Checklist"

Updated 26-Oct-2019 to clarify creeping idle RPM increase as the car is being driven. Many of you are familiar with the "Cranks OK, but No Start Checklist for Fuel Injected Mustangs" checklist and the No Crank Checklist. They are very effective in finding and eliminating the problems by use of...

forums.stangnet.com

Read it through, make sure you understand then start at the top and do it step by step, don't skip around.
You to be methodical when it comes to efi.
No, you do not need a 'soft tune'.
Maybe a 'tune up', but not a 'tune'.

I agree no soft tune stock parts, my mind thinks modified most times.

General karthief · Jun 8, 2020

7991LXnSHO said:
@CarMichael Angelo, if I have a masters degree plus some hours, (so that is approximately is being in 19th grade), but I last taught sixth through eighth grade classes, am I supposed to chime in or not? They might have brought me to their level.

^^^^^ he said ------ oh nevermind, carry on.

Idle issue still!! Replaced several parts.. looking for more ideas!!

Joshmack111

Member

KRUISR

CarMichael Angelo

my rearend will smell so minty fresh,

Joshmack111

Member

Joshmack111

Member

CarMichael Angelo

my rearend will smell so minty fresh,

Joshmack111

Member

redNfast

Active Member

Joshmack111

Member

General karthief

wonder how much it would cost to ship you a pair

Help me create the "Surging Idle Checklist"

nickyb

I gotta say i never painted my nuts, Never Ever

Help me create the "Surging Idle Checklist"

redNfast

Active Member

Help me create the "Surging Idle Checklist"

General karthief

wonder how much it would cost to ship you a pair

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Idle issue still!! Replaced several parts.. looking for more ideas!!

Member

my rearend will smell so minty fresh,

Member

Member

my rearend will smell so minty fresh,

Member

Active Member

Member

wonder how much it would cost to ship you a pair

I gotta say i never painted my nuts, Never Ever

Active Member

wonder how much it would cost to ship you a pair

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