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

#67
jrichker

Thread '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 Checklist. They are very effective in finding and eliminating the problems by use of a systematic process that checks and eliminates possible causes. This idle problem checklist will use the same troubleshooting strategy and methodology.

By the term surging idle, I mean an idle that...
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Step 7
 
#68
Noobz347 said:
jrichker

Thread '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 Checklist. They are very effective in finding and eliminating the problems by use of a systematic process that checks and eliminates possible causes. This idle problem checklist will use the same troubleshooting strategy and methodology.

By the term surging idle, I mean an idle that...
  • Like


Step 7
Click to expand...
What part would you measure in step 7? Between C-D?
c-B? d-B? ?
 
#69
sands9330014 said:
What part would you measure in step 7? Between C-D?
c-B? d-B? ?
Click to expand...

From the checklist:


Check the resistance of the MAF signal wiring. Pin D on the MAF and pin 50 on the computer (dark blue/orange wire) should be less than 2 ohms. Pin C on the MAF and pin 9 on the computer (tan/light blue wire) should be less than 2 ohms.

There should be a minimum of 10K ohms between either pin C or D on the MAF and ground.
 
#70
Noobz347 said:
From the checklist:


Check the resistance of the MAF signal wiring. Pin D on the MAF and pin 50 on the computer (dark blue/orange wire) should be less than 2 ohms. Pin C on the MAF and pin 9 on the computer (tan/light blue wire) should be less than 2 ohms.

There should be a minimum of 10K ohms between either pin C or D on the MAF and ground.
Click to expand...
If so, does this mean there is a problem with the MAF I purchased? I checked the smell of the engine oil and it smells a bit like gasoline, but could this be because I've started the engine many times with black smoke coming out?
 
#71
Noobz347 said:
From the checklist:


Check the resistance of the MAF signal wiring. Pin D on the MAF and pin 50 on the computer (dark blue/orange wire) should be less than 2 ohms. Pin C on the MAF and pin 9 on the computer (tan/light blue wire) should be less than 2 ohms.

There should be a minimum of 10K ohms between either pin C or D on the MAF and ground.
Click to expand...
I checked the wiring to the MAF and the Ω from the MAF to the computer. I don't think there's a problem.
 
#72
After warming up the engine, I revved it to check, and black smoke came out. The idle also went up and down.
After that, I removed the wiring from the left and right O2 sensors and tried revving it. It still spits black smoke. Please help.
 
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