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#4103820 - 04/02/21 06:54 PM 2006 CVPI engine doesn’t sound right.
jtroyst Offline
Stranger

Registered: 03/30/21
Posts: 3
Loc: California
Hello all, just bought a 2006 Crown Victoria with 138k miles.

Driving it home, the check engine light was on, I assumed it was the EGR valve was bad since it was almost stalling out at stops. Smog showed it was throwing three codes, one for EGR, one for the MAP sensor out of range, and one for an O2 sensor reading too lean. I replaced the MAP and EGR valve, and the CEL came back on. Haven’t had it scanned yet, but just a little back story.

Here’s my question. At a full stop it jerks forward repeatedly as I ease off the gas, other than that it seems to run fine. It doesn’t, however, sound like a crown Victoria should. No abnormal pinging or anything, but it just doesn’t have the deep roar it should. Sounds kind of lame. Hopefully that makes sense lol. Almost sounds as quiet at a v6.

Wondering if that’s a sign the intake manifold may not be sealed or maybe another issue.
Any help is appreciated!

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#4103898 - 04/03/21 11:24 PM Re: 2006 CVPI engine doesn’t sound right. [Re: jtroyst]
88grandmarq Offline

4R70W rebuilder
Poobah

Registered: 07/10/02
Posts: 6837
Loc: Indiana
These cars dont have a MAP sensors - Manifold absolute pressure.
they do have a MAF sensors - Mass air flow.

Replacing random sensors is a waste of time and money. Understand what causes the fault code to trigger, then perform a proper diagnosis.

Use a decent scan tool and read all modules for stored fault codes then go from there.
_________________________
2011 P7B - retired Jay county Indiana Sheriffs car
2003 Lincoln Town Car Signature - 3.27 RAR, dual exhaust and J-mod - SOLD 09/2011
89 Crown Victoria LX- HPP Box - SOLD 09/2010
88 Grand Marquis LS - The original - Totaled 5/2006

I rebuild AODE/4R70W/4R75E Transmissions, check out my Facebook page for my latest project; https://www.facebook.com/Ford-transmission-repairs-Jmod-348414635312478/

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#4104452 - 04/08/21 12:16 PM Re: 2006 CVPI engine doesn’t sound right. [Re: 88grandmarq]
2010mgm2010 Offline
Rookie

Registered: 08/30/17
Posts: 56
Loc: ss
Originally Posted By 88grandmarq
These cars dont have a MAP sensors - Manifold absolute pressure.
they do have a MAF sensors - Mass air flow.

Replacing random sensors is a waste of time and money. Understand what causes the fault code to trigger, then perform a proper diagnosis.

Use a decent scan tool and read all modules for stored fault codes then go from there.

no, they have MAP sensor equipped with EGR
_________________________
2010 Grand Marquis Bolt ons
Obx headers with 2.5" Exhaust
75MM TB form 5.4 3v
custom intake 6" kn with 80mm maf housing to cpvi zip tube
Trickflow plenum
3.55 LCD gears

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#4104454 - 04/08/21 12:21 PM Re: 2006 CVPI engine doesn’t sound right. [Re: jtroyst]
2010mgm2010 Offline
Rookie

Registered: 08/30/17
Posts: 56
Loc: ss
check vacuum ports and there no vacuum leaks
there is vacuum line
from plenum connected to map Sensor and fuel pressure sensor
make sure its ok and not plugged
these cars runs on maf sensor with a little help with map sensor
to calculate engine load which give accurate timing and shifts
best way clean plenum with vacuum ports
_________________________
2010 Grand Marquis Bolt ons
Obx headers with 2.5" Exhaust
75MM TB form 5.4 3v
custom intake 6" kn with 80mm maf housing to cpvi zip tube
Trickflow plenum
3.55 LCD gears

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#4104636 - Yesterday at 05:35 AM Re: 2006 CVPI engine doesn’t sound right. [Re: jtroyst]
jtroyst Offline
Stranger

Registered: 03/30/21
Posts: 3
Loc: California
Okay, so i did some work on the car this weekend (mostly preventative). I replaced the intake manifold (the car had a dorman NPI intake manifold that had a crack on the inside of one of the runners that meets the thermostat housing. didnt look to be leaking coolant, but was only a matter of time. Replaced it with a Ford Racing PI intake manifold and some FelPro gaskets. Seems to have given the engine a new sound and new life. It now sounds how it should under acceleration. I also replaced the water pump, spark plugs, injectors, cleaned the fuel rails, and changed the oil.

Car is running great, but I still had three codes (P0108 MAP/BP circuit high, P0406 EGR sensor A circuit high, and P2197 O2 sensor signal biased, stuck lean bank 2 sensor 1) which i find odd that the egr valve assembly has been replaced with a brand new one.

Drove the car around town some, maybe 20 miles or so. the P0108 code has gone away, but i am still stuck with the P2197 and P0406 codes. checked around the intake manifold and throttle body and any vacuum lines i can see and cant seem to find or hear a leak. Any ideas? Will these codes go away after driving it around some? The guy at the smog shop told me i needed to drive it at least 100 miles after having the issues repaired.

Thanks for the responses!

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#4104666 - Yesterday at 01:21 PM Re: 2006 CVPI engine doesn’t sound right. [Re: jtroyst]
Bangster Offline

Poobah

Registered: 11/30/01
Posts: 9403
Loc: Tucson Az
Did you clear the codes by unplugging the battery or by using a scan tool?

To have the o2 monitor ran again it is simply cruise at 40 mph for 4 minutes.

I think the EVR is part of the EGR in 2003+, when you had the intake off did you see the DPFE off the back of the head, did it have 2 silicone hoses still attached?
_________________________
00 Grand Marquis LS Premium - 97 Cougar 4.6 Sport - 89 Cougar LS - 63 Falcon 302 - 82 F-150 - 97 Mark VIII LSC - 2017 Escape SE - 2012 Fusion Sport AWD

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#4104672 - Yesterday at 03:02 PM Re: 2006 CVPI engine doesn’t sound right. [Re: Bangster]
jtroyst Offline
Stranger

Registered: 03/30/21
Posts: 3
Loc: California
Originally Posted By Bangster
Did you clear the codes by unplugging the battery or by using a scan tool?

To have the o2 monitor ran again it is simply cruise at 40 mph for 4 minutes.

I think the EVR is part of the EGR in 2003+, when you had the intake off did you see the DPFE off the back of the head, did it have 2 silicone hoses still attached?


Didn’t see a sensor on the back of the head, but I did replace the entire EGR valve assembly with a brand new one. O2 sensors were replaced by the previous owner, all seem to be plugged in and wires don’t look torn or melted. I reset the codes with a scan tool, so far I still have the two.

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#4104800 - Today at 03:09 PM Re: 2006 CVPI engine doesn’t sound right. [Re: jtroyst]
Tenevic_P71 Offline
Climber

Registered: 08/27/15
Posts: 981
Loc: US
Have you looked at the live data for the fuel trims and o2 sensors?
_________________________
2007 P71, 94k, 2700 hours, 3.27 traclock. #21040-Sold 10/'20
2009 P71, 129k, 1100 hours, 3.27 open. #138-Sold 11/'18
2007 P71, 156k, 6400 hours, 3.55 traclock. #3422-Sold 06/'17
2006 P71, 135k, 4800 hours, 3.55 traclock. #3375-Sold 12/'16
Ooh, trouble-free transmission

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