I want to fix my car that is emitting rich black smoke.

sands9330014 · Mar 12, 2025

I've tried replacing various parts but it hasn't been fixed. Please help.
The parts replaced are:
ECU
ECT
ACT
MAF
BAP
TPS
IAC
o2 sensor
fuel pump
fuel filter
fuel pressure regulator
head
distributor
coil.　　　
When I tested it with a scanner, koer42 and 26 were displayed. I removed the scanner and tested it using the wiring.
I also tried a cylinder test.
Please help.

https://youtu.be/AX9u5J9mI7A

General karthief · Mar 12, 2025

Help me create the "Surging Idle Checklist"

Updated 05 July 2022 to add rough idle when cold and smooth idle when up to normal operating temperature. See the EGR tech information, section #15 for more help. Many of you are familiar with the "Cranks OK, but No Start Checklist for Fuel Injected Mustangs" checklist and the No Crank...

www.stangnet.com

Follow the directions, step by step.
Post up any questions here.

Noobz347 · Mar 12, 2025

Black smoke?

I would hazard to guess that either your rings or valve seals are totally shot.

How many miles on this engine?

gkomo · Mar 12, 2025

What cylinder test did you do?

sands9330014 · Mar 12, 2025

Noobz347 said:
Black smoke?

I would hazard to guess that either your rings or valve seals are totally shot.

How many miles on this engine?

Thank you. The cylinder head has been rebuilt and the valve seals replaced.

sands9330014 · Mar 12, 2025

gkomo said:
What cylinder test did you do?

Thank you. I think I did a cylinder test, as mentioned in the youtube video above. KOEO 11
KORE 21 26 42 92 18 ? It seems to be displayed. The cylinder balance test shows 8, 7, 6, 5, 3? I have replaced the injectors, but is there something wrong with the injectors? There is no black smoke when the engine is in open loop, but when the water temperature warms up and the engine enters closed loop, black smoke is emitted. The amount of gasoline used up is very fast.

AeroCoupe · Mar 13, 2025

Need more information on the car. What year? Is the engine stock or does it have aftermarket parts like intakes, heads, MAF, injectors, etc. Is the motor a stroker? Is the car a 4 cylinder conversion or a factory V8?

Another thing it could possibly be is the ECU itself as they are 30+ years old and can have problems but don't just send it off to get fixed unless you have good reason.

sands9330014 · Mar 13, 2025

AeroCoupe said:
Need more information on the car. What year? Is the engine stock or does it have aftermarket parts like intakes, heads, MAF, injectors, etc. Is the motor a stroker? Is the car a 4 cylinder conversion or a factory V8?

Another thing it could possibly be is the ECU itself as they are 30+ years old and can have problems but don't just send it off to get fixed unless you have good reason.

Thank you. The car is 1991, the engine is 5.0HO, the injector is FOTE-D5A, and the ECU was replaced with an ECU exchange the other day.The head is also rebuilt and the engine is not a stroker.

LILCBRA · Mar 13, 2025

I just want to note that the YouTube link doesn't work for me.

~~What size are the injectors you've installed?~~ You've replaced the regulator as well, have you verified what fuel pressure it's actually sending through the injectors?

Edit: it looks like we both posted at the same time, you just answered that question.

sands9330014 · Mar 13, 2025

View: https://youtu.be/AX9u5J9mI7A?si=eiVmATGUb8egsrbG

sands9330014 · Mar 13, 2025

AeroCoupe said:
Need more information on the car. What year? Is the engine stock or does it have aftermarket parts like intakes, heads, MAF, injectors, etc. Is the motor a stroker? Is the car a 4 cylinder conversion or a factory V8?

Another thing it could possibly be is the ECU itself as they are 30+ years old and can have problems but don't just send it off to get fixed unless you have good reason.

Thank you. The car is 1991, the engine is 5.0HO, the injector is FOTE-D5A, and the ECU was replaced with an ECU exchange the other day.The head is also rebuilt and the engine is not a stroker.

sands9330014 · Mar 13, 2025

LILCBRA said:
I just want to note that the YouTube link doesn't work for me.

~~What size are the injectors you've installed?~~ You've replaced the regulator as well, have you verified what fuel pressure it's actually sending through the injectors?

Edit: it looks like we both posted at the same time, you just answered that question.

The fuel pressure regulator has also been replaced and the fuel pressure is being measured.

General karthief · Mar 13, 2025

What are the pressure readings?
at idle with vacuum line on first then check pressure with vac line removed.

AeroCoupe · Mar 13, 2025

So you have 20 lb/hr injectors. Stock is 19 so that could contribute to it running fat as the tables in the ECU are configured for the 19 lb/hr injectors. I am not saying that is it but it may not be helping.

General karthief · Mar 13, 2025

I would imagine the MAF needs to be matched to the injectors too so stock MAF needs 19lb injectors.

sands9330014 · Mar 13, 2025

Yes. I am also concerned about the injectors I replaced. Some websites say 19lbs or 20lbs, so I was wondering. Do you know which injectors are the correct 19lbs injectors?

AeroCoupe said:
So you have 20 lb/hr injectors. Stock is 19 so that could contribute to it running fat as the tables in the ECU are configured for the 19 lb/hr injectors. I am not saying that is it but it may not be helping.

Yes. I am also concerned about the injectors I replaced. Some websites say 19lbs or 20lbs, so I was wondering. Do you know which injectors are the correct 19lbs injectors?

sands9330014 · Mar 13, 2025

General karthief said:
I would imagine the MAF needs to be matched to the injectors too so stock MAF needs 19lb injectors.

Yes. I am also concerned about the injectors I replaced. Some websites say 19lbs or 20lbs, so I was wondering. Do you know which injectors are the correct 19lbs injectors?

Noobz347 · Mar 13, 2025

sands9330014 said:
Yes. I am also concerned about the injectors I replaced. Some websites say 19lbs or 20lbs, so I was wondering. Do you know which injectors are the correct 19lbs injectors?

Yes. I am also concerned about the injectors I replaced. Some websites say 19lbs or 20lbs, so I was wondering. Do you know which injectors are the correct 19lbs injectors?

This is the correct size/style for a stock 5.0.

sands9330014 · Mar 13, 2025

Noobz347 said:
This is the correct size/style for a stock 5.0.

sands9330014 · Mar 13, 2025

sands9330014 said:

I have this injector.

I want to fix my car that is emitting rich black smoke.

Member

wonder how much it would cost to ship you a pair

Stangnet Facilities Maint Tech... Er... Janitor

now i can hopefully expect to receive the shaft

Member

Member

lube between the nut and the face. I know my lubes

Member

I wish I didn't have all of these balls in the air

Member

Member

Member

wonder how much it would cost to ship you a pair

lube between the nut and the face. I know my lubes

wonder how much it would cost to ship you a pair

Member

Member

Stangnet Facilities Maint Tech... Er... Janitor

Member

Member

Similar threads

Privacy & Transparency

Privacy & Transparency