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Dan
Dan, ASE Certified Technician
Category: Ford
Satisfied Customers: 1696
Experience:  Auto Technician
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1993 f150 code 173 right side, 173 tried to reset, egr valve

Customer Question

1993 f150 code 173 rich right side
JA: Just to clarify, what's the exact code? And have you tried to reset it?
Customer: 173 tried to reset
JA: Are you fixing your F150 yourself? What have you tried so far?
Customer: egr valve feul fressure regulater egr sensor no maf sensor
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 9 months ago.
Category: Ford
Expert:  david craig replied 9 months ago.

Hi Im David, thanks for visiting the site. hows the vehicle running? ok?

Customer: replied 9 months ago.
but wont pass smog
Expert:  david craig replied 9 months ago.

ok. give a a few minutes, we'll figure this out.

Expert:  david craig replied 9 months ago.

what engine?

Customer: replied 9 months ago.
5.8
Expert:  david craig replied 9 months ago.

thank you

Expert:  david craig replied 9 months ago.

check for air intake leaks and unmetered air ....check for vacuum leaks. use a can of carb cleaner while engine is running ans spray it around every vacuum connection, throttle body and intake base. listen for rpm changing.

Expert:  david craig replied 9 months ago.

let me know if you find a leak. its running rich because the is to much air entering the engine.......

Customer: replied 9 months ago.
could not find any vacuum leaks
Expert:  david craig replied 9 months ago.

ok. let me think about this

Expert:  david craig replied 9 months ago.

With dual HO2S, DTC 173 refers to right or rear HO2S.
HO2S always rich could be caused by:
Moisture inside HO2S harness connector resulting in a short to power.
HO2S circuit shorted to power.
Key off.
Disconnect the suspect HO2S from vehicle harness.
Inspect both ends of the connector for damaged or pushed out pins, moisture, corrosion, loose wires, etc. Service as necessary.
Key on, engine off.
Measure voltage between HO2S circuit and PWR GND at the HO2S vehicle harness connector

Is voltage less than 0.5 volt?

Customer: replied 9 months ago.
VOLTAGE IS 2.1
Expert:  david craig replied 9 months ago.

ok. thank you. i will let you know what the next step is shortly

Expert:  david craig replied 9 months ago.

im back and looking into this now

Expert:  david craig replied 9 months ago.

go to the coil. pull off the coil plug wire and Where it connects on the coil end the coil contact male and female look for corrosion how it . Clean it with electrical cleaner...

Customer: replied 9 months ago.
it has new coil wires plugs should I do a smoke test for small vacuum leak
Expert:  david craig replied 9 months ago.

A smoke test will certainly find any leaks.

Expert:  david craig replied 9 months ago.

just checking in to see how its going

Expert:  david craig replied 9 months ago.

did you do a smoke test?

Customer: replied 9 months ago.
no leaks found
Expert:  david craig replied 9 months ago.

ok well im going to open up the question to others. im out of ideas. good luck

Expert:  Dan replied 9 months ago.

Hello, my name Dan. Thank you for using just answer. I am reviewing your question and will get back to you shortly. Thanks

Expert:  Dan replied 9 months ago.

Does the engine misfire?

Expert:  Dan replied 9 months ago.

If not, then replace the fuel pressure regulator. This is the most common cause for this code.

Please reply to this if you need more help and we can continue this conversation. This does not have to be my only answer. If you are satisfied with my service, please rate at the top of the screen. Rating does not close out your question. Remember, sometimes it is difficult to completely diagnose your vehicle without being there, but I will try to give you the best answer I can. Please rate 5 stars. Thanks

Expert:  Dan replied 9 months ago.

http://amzn.to/2iPIiOJ

Here is a link

Customer: replied 9 months ago.
replaced feul pressure regulater egr valve and sensor no misfire
Expert:  Dan replied 9 months ago.

Have you checked fuel pressure?