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

Joshmack111

Member
May 28, 2020
19
2
13
35
Raleigh, nc
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.
 
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KRUISR

Well-Known Member
Apr 16, 2015
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Some other info on the engine combo. Is this totally stock or heavily modified? If modified, with what?
 

Joshmack111

Member
May 28, 2020
19
2
13
35
Raleigh, nc
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..
 

redNfast

Active Member
Apr 5, 2020
70
35
28
74
Woodstock, GA
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?
 
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Joshmack111

Member
May 28, 2020
19
2
13
35
Raleigh, nc
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

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
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polk county florida
Start here:
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'.
 
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nickyb

WAIT,you now have a pair?
10 Year Member
Apr 3, 2009
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Start here:
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

Active Member
Apr 5, 2020
70
35
28
74
Woodstock, GA
Start here:
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.