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Code PO171, PO174, PO305, PO306

Tiny
MICHAEL THOMAS2
  • MEMBER
  • 2004 LINCOLN TOWN CAR
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
HI Guys, I have a 2004 Lincoln Town Car Limo. 4.6 l motor. Same as the regular car. On idle after about 30 minutes. It starts to act like it wants to stall. It will stay on idle (rough), but then when I go to leave it will drive, but I have to keep pumping gas pedal, after about 5 minutes it runs fine. I changed the number 5 and number 6 Coil, but they keep coming up only after letting car idle again for a period of time? Please help.
Also I need a new fuel indicator which is in gas tank. Code 460 and 463. Could this be the reason for my other problems? Those 2 codes are constant.

Thank you, Big Mike
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Thursday, February 13th, 2020 AT 5:38 PM

9 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi Mike,

I don't think the float level response in tank is causing the issue. I do need to know something. The P0171 and 174 both show up as a lean fuel mixture. Have you checked for vacuum leaks and fuel pressure? By any chance does the vehicle have an exhaust leak near the exhaust manifold? A lean mixture can be causing the issue.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Let me know.

Joe
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Thursday, February 13th, 2020 AT 6:44 PM
Tiny
MICHAEL THOMAS2
  • MEMBER
  • 7 POSTS
Thanks Joe! No I haven't I'm going to do a compression test on the cylinders, but will check for vacuum leaks and fuel pressure, as well, and let you know.
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Thursday, February 13th, 2020 AT 11:36 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Let me know what you find. Based on the codes, I don't think it is a compression issue. I guess it could cause the misfire codes, but not the lean codes. I suspect it is either a vacuum issue or fuel pressure.

Let me know what you find. I really interested in hearing the results.

Take care,
Joe
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Friday, February 14th, 2020 AT 2:16 PM
Tiny
MICHAEL THOMAS2
  • MEMBER
  • 7 POSTS
Follow up: I have done the vacuum check, except for the vacuum gauge. I don't have that tool. So far there seems to be no leaks. My A/C is blowing hot in the front, but not in the rear passenger compartment of limo. Not sure if that is related? I'm hoping it just needs to be recharged. I'll be recharging A/C, and checking fuel pressure these next few days. Also, have a new code come up p2195? Any ideas?
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Monday, February 17th, 2020 AT 10:55 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

Just to reinforce Joe's replies, I agree that you may have low fuel pressure causing the codes. Very common for this issue.

2195 is a lean indication also connected to the other codes.

Roy
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Tuesday, February 18th, 2020 AT 5:03 AM
Tiny
MICHAEL THOMAS2
  • MEMBER
  • 7 POSTS
Follow up: Hi guys, thanks for your timely responses and input. When I first got the 171 and 174 code I originally tried to clean the MAP sensor. Well a few later, as I'm still getting those codes other things start to happen ie: PO 300.305, 306, and P2195. So my buddy brought over his smoke machine, and before we plugged it in we took the MAP sensor off and thoroughly sprayed it with carburetor cleaner (which they suggest you don't use), then before reinstall MAP cleaner. I'm not sure if I cleared the codes, but my Check Engine light immediately was gone! Haven't let it sit and idle for a long period yet, but that solved the issue, which in turn brought on the other issues. I'll be returning my other coils purchased tomorrow. Thanks guys!
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Wednesday, February 19th, 2020 AT 9:26 PM
Tiny
ASEMASTER6371
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You are welcome.

We are always glad to help.

Feel free to leave a review about us at the following link.

https://www.google.com/search?q=2carpros&gs_ivs=1#lrd=0x80dcd47364be5d0d:0xba091aa4209f4497,1,,,&tts=0

Roy
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Thursday, February 20th, 2020 AT 2:24 AM
Tiny
MICHAEL THOMAS2
  • MEMBER
  • 7 POSTS
Update 2: Took Limo out on run last night, after about 30 minutes of idle time it started back up. Car vibrating, motor shaking like it wanted to stall. After 2 hours took her back home, (It took 5 minutes before car engaged and drove normal). Checked codes and got the same PO171, 174, 300, 305, 316, P2195. Haven't a clue what 316 is? I will do a complete smoke vacuum check next week!
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Friday, February 21st, 2020 AT 3:14 PM
Tiny
ASEMASTER6371
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316 is a misfire during the first 1000 engine RPM.

In most cases, it is the number 6 ignition coil failure.

Roy

HD: Misfire Detection Monitor

HD: Introduction See: Computers and Control Systems > Diagnostic Trouble Code Tests and Associated Procedures > HD: Misfire Detection Monitor - Introduction

HD1 CHECK FOR ADAPTIVE FUEL MONITOR AND HEGO MONITOR DTCS (CONTINUOUS MEMORY)

Check the PCM for self-test DTCs.
Are DTCs P0136, P0156, P0171, P0172, P0175, P2270, P2271, P2272 or P2273 present?
Yes

GO to HD3
.

No

GO to HD2
.

HD2 CHECK FOR OTHER NON-MISFIRE CONTINUOUS MEMORY DTCS

Are there other non-misfire DTC in Continuous Memory. Present?
Yes

DISREGARD the current diagnostic trouble code (DTC) at this time. DIAGNOSE the next DTC. GO to Section 4, Diagnostic Trouble Code (DTC) Charts See: A L L Diagnostic Trouble Codes ( DTC ) > Diagnostic Trouble Code Descriptions > Diagnostic Trouble Code (DTC) Charts.

No

GO to HD3
.

HD3 CHECK FOR ANY OTHER KOEO SELF TEST DTCS

Are any other KOEO DTCs present?
Yes

(If misfire or coil DTCs are present, and WDS or an equivalent tool is
available, use the scope function to verify the suspect coil.).

DISREGARD the current diagnostic trouble code (DTC) at this time. DIAGNOSE the next DTC. GO to Section 4, Diagnostic Trouble Code (DTC) Charts See: A L L Diagnostic Trouble Codes ( DTC ) > Diagnostic Trouble Code Descriptions > Diagnostic Trouble Code (DTC) Charts.

No

Key in OFF position.

For spark plug wires that are OK:

GO to HD4
.

For spark plug wires that need evaluation:

GO to JB1 See: Computers and Control Systems > Diagnostic Trouble Code Tests and Associated Procedures > JB: Secondary Ignition (COP) - Pinpoint Test
.

HD4 CHECK FOR ANY OTHER CODES THAT MAY CAUSE A MISFIRE

Check for self-test DTCs.
Are DTCs P1131, P1132, P1137, P1138, P1151, P1152, P1157 or P1158 present?
Yes

GO to HD6

No

GO to HD5
.

HD5 CHECK FOR ANY OTHER KOER DTCS

Are any other KOER DTCs present?
Yes

Key in OFF position. DISREGARD the current diagnostic trouble code (DTC)
at this time. DIAGNOSE the next DTC. GO to Section 4, Diagnostic Trouble Code (DTC) Charts See: A L L Diagnostic Trouble Codes ( DTC ) > Diagnostic Trouble Code Descriptions Diagnostic Trouble Code (DTC) Charts.

No

GO to HD6
.

HD6 CHECK THE INJECTOR DRIVER PIDS INJ1F THROUGH INJ10F

Key ON, engine OFF.

Access the appropriate INJxF PIDs for the suspect injector.
Are the PIDs status YES?
Yes

GO to HD7
.

No

Key in OFF position.

For Dedicated NGV

GO to HA27 See: Computers and Control Systems > Pinpoint Tests > HA: Natural Gas Fuel Control - Pinpoint Test
.

For all others:

GO to HD8
.

HD7 CHECK THE FUEL INJECTORS AND HARNESS FOR AN OPEN

PCM connector disconnected.

Measure the resistance between:

image

Is the resistance between 11 - 18 ohms?
Yes

Install a new PCM.
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Friday, February 21st, 2020 AT 3:24 PM

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