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#3497874 - 01/05/17 10:45 PM Pi Swap Check Engine Light
JLewis59 Offline
Stranger

Registered: 09/18/16
Posts: 6
Loc: Plymouth, Ohio
I have a 2000 Grand Marquis, and not so long ago did a pi head and intake swap. Since then, the check engine light has been on. I got it scanned at auto zone, and they said the code was saying it was running rich in one of the banks. Before I did the swap there was no check engine light and no problems, theres also no problems now except whenever i start the car in the cold, if I dont let the engine get warmed up for about 15 minutes the car will stall if i put it in drive or reverse. I was wondering what this problem could be? Everything was fine before the swap and now the light is on and it;s bothering me. Thanks for any info on this.
_________________________
2000 Mercury Grand Marquis - 80,000 Miles - Pi Head and Intake Swap, Directed Audio and Alpine Type R 12 inch subs

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#3498162 - 01/06/17 12:38 AM Re: Pi Swap Check Engine Light [Re: JLewis59]
85ltdcrownvic Offline
Member

Registered: 03/20/16
Posts: 358
Loc: Naples, Fl
It sounds like a combination of a bad iac and vacuum leak on only one bank. Pull the manifold and put new rtv around the ports and check the iac by unplugging it while idling to see if it makes a difference.

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#3547153 - 02/15/17 10:58 PM Re: Pi Swap Check Engine Light [Re: 85ltdcrownvic]
JLewis59 Offline
Stranger

Registered: 09/18/16
Posts: 6
Loc: Plymouth, Ohio
I was told to check for a vaccum leak i could spray starting fluid around the intake and whatnot and if i hear a rise in rpms then it means i have one. Would you say thats where i should start? Also we put injectors in the were bigger then the stock one which we got from a junk yard, but we tested them and they seemed to be working. COuld that cause the problem? Maybe one it sticking or has an unsual spray pattern? Thanks
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2000 Mercury Grand Marquis - 80,000 Miles - Pi Head and Intake Swap, Directed Audio and Alpine Type R 12 inch subs

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#3547658 - 02/16/17 01:09 PM Re: Pi Swap Check Engine Light [Re: JLewis59]
casey67 Offline
Rookie

Registered: 12/25/16
Posts: 67
Loc: Lemont,IL
Do not use starting fluid- way too toxic and flamable.
Use carb cleaner - the engine could run on it-it will find a vacuum leak.

On a stock engine, 2 reasons for running rich are the fuel pressure regulator ( pull the hose off when cold-turn key on-see if fuel leaks)
And Mass air flow sensor (MAF) try cleaning it with throttle body cleaner.Make sure to let it dry well.
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08 CVpi

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#3548178 - 02/17/17 12:19 AM Re: Pi Swap Check Engine Light [Re: JLewis59]
stalag Offline
Over the Hill

Registered: 03/29/09
Posts: 3782
Loc: Columbus, OH
For the MAF I would only use electronics cleaner. The solvents in carburetor cleaner and starting fluid both melt plastic and will foul the MAF sensor by coating that little thin wire that reads the air flow with the dissolved plastic. In fact if you intent on using carb cleaner/starting fluid it is highly recommended you spray that only into the throttle body itself and not the air tube or air box. In a modern computer controlled car though the use of starting fluid should never be needed. Diesels may require starting fluid when in subzero temperatures due to the way fuel is ignited in a diesel.
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Stalag;___________Just for Rizzo I am posting this in my sig. Coolants
2001 Lincoln Town Car Cartier L, 1997 Mercury Grand Marquis (extinct)
On my LTC the following mods/upgrades were added. Heinous motorsport control arms, Command Automotive SD-1 rotors (these rotors can no longer be obtained), Calipers by Goldlinebrakes.com in silver with Hawk HPS pads (now running Ford OEM), MSD COP's. MZT is also applied with programming from BOC. j-mod is now done. Final rebuild of transmission done by Gearstar.

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#3548298 - 02/17/17 08:37 AM Re: Pi Swap Check Engine Light [Re: JLewis59]
mdnos Offline
Over the Hill

Registered: 08/28/09
Posts: 1987
Loc: not here any longer
The larger injectors may be causing too much fuel to be dumped in causing a rich condition..I don't believe you can just put a larger injector in when the pcm is calibrated for another size.
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Marauder, Trilogy supercharger, all supporting mods.

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#3548386 - 02/17/17 11:20 AM Re: Pi Swap Check Engine Light [Re: JLewis59]
BigNSlow Offline

Aussie powered
Metroplectic

Registered: 01/31/03
Posts: 40161
Loc:
Sounds like you got vacuum leak on one side of the intake. How long did you wait for the RTV to dry before running the car? What gaskets did you use?

Also put stock injectors back on. Your fuel table is off.


Edited by BigNSlow (02/17/17 11:21 AM)
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1985 Grand Marquis
2002 Volvo V70

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#3548482 - 02/17/17 01:34 PM Re: Pi Swap Check Engine Light [Re: JLewis59]
Bangster Offline

Poobah

Registered: 11/30/01
Posts: 7956
Loc: Tucson Az
Why RTV? with PI heads and PI intake, no mismatch.

I second going back to the original injectors.
_________________________
00 Grand Marquis LS Premium - 97 Cougar 4.6 Sport - 89 Cougar LS - 63 Falcon 302 - 82 F-150 -
1974 Honda cb400

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#3548722 - 02/17/17 04:40 PM Re: Pi Swap Check Engine Light [Re: JLewis59]
BigNSlow Offline

Aussie powered
Metroplectic

Registered: 01/31/03
Posts: 40161
Loc:
Sorry, musta missed the head part. Yea, no need for RTV then.
_________________________

1985 Grand Marquis
2002 Volvo V70

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#3563257 - 03/04/17 10:46 PM Re: Pi Swap Check Engine Light [Re: BigNSlow]
JLewis59 Offline
Stranger

Registered: 09/18/16
Posts: 6
Loc: Plymouth, Ohio
Alright so i went back to the original injectors and notices something that seemed very odd. I have a vacuum line that is hooked up to a stud on my intake i believe. For some reason i don't think that's where it should be at, and was wondering what everyone thought. The only problem is i don't see where else it'd go seeing as how short it is and how it fits exactly on the bolt. Also, there is a vacuum line that has two ends on it, ones longer than the other to hook on what i believe to be some sort of sensor, and where it hooks up at there is one short and one long little spot to hook up bu it seems the small end of the line isn't staying in place well. Any thoughts?
_________________________
2000 Mercury Grand Marquis - 80,000 Miles - Pi Head and Intake Swap, Directed Audio and Alpine Type R 12 inch subs

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#3563601 - 03/05/17 10:31 AM Re: Pi Swap Check Engine Light [Re: JLewis59]
Bangster Offline

Poobah

Registered: 11/30/01
Posts: 7956
Loc: Tucson Az
Are you talking about this ground wire? Disregard the way the heater hose is on there, the heater is bypassed.


Is this the "sensor" with the two hard vacuum lines? Green goes to the top if that helps.
_________________________
00 Grand Marquis LS Premium - 97 Cougar 4.6 Sport - 89 Cougar LS - 63 Falcon 302 - 82 F-150 -
1974 Honda cb400

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#3564025 - 03/05/17 06:36 PM Re: Pi Swap Check Engine Light [Re: JLewis59]
BigMerc96 Offline

I know nothing
Posting Addict

Registered: 06/05/10
Posts: 16133
Loc: I can see Detroit from here!
That "sensor" is the EGR vacuum solenoid. If you follow the 2 lines going into it, one will come off the plenum, the other goes to the EGR. Its job in life is to control how much vacuum pressure goes to the EGR diaphragm thus controlling how much the EGR opens.
_________________________
-Steve

1998 Mercury Grand Marquis LS HPP ~88k miles, stock for now.

1997 Town Car Cartier ~140k miles, 70mm TB, Ported Plenum, Gutted Airbox, Mechanical Fan Delete, Contour E-fan Retrofit, Dual exhaust with Magnaflows, rear cat delete, MSD Ignition, KYB Gas-A-Justs, Marauder/HPP rear sway bar, P71 front bar, air ride reinstated, Blinker Mod, Projector retrofit, Caddy 4-note horn retrofit, Wood rim steering wheel retrofit, natural weight reduction.. Smashed 1/13/13....I fixt it..
1996 Mercury Grand Marquis GS 117,485mi. R.I.P. 7/14/12 frown
Originally Posted By s33k3r
I hate CAFE. I'm all for using up every last drip of oil on Earth, as quickly as possible. If there's no more oil/gas, you will get a green Earth that much faster...

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#3564169 - 03/05/17 08:29 PM Re: Pi Swap Check Engine Light [Re: Bangster]
JLewis59 Offline
Stranger

Registered: 09/18/16
Posts: 6
Loc: Plymouth, Ohio
Alright so that is a ground then, and yes thats the sensor i can't remember if i had green on top or not, ill check tomorrow but however i had it it seemed like the green wouldnt stay on, like the sensor didnt have enough of a little tube for it to slide on to and hold it on.
_________________________
2000 Mercury Grand Marquis - 80,000 Miles - Pi Head and Intake Swap, Directed Audio and Alpine Type R 12 inch subs

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#3564737 - 03/06/17 10:37 AM Re: Pi Swap Check Engine Light [Re: JLewis59]
Chevyguy Offline

Poobah

Registered: 01/05/04
Posts: 9307
Loc: Winchester Mass
I also found you want to swap in a 2001-2002 style MAF, even when using the stock 70 mm style. I did notice a change vs my old 96 MAF

NPI style MAF from my 96 Town Car



PI Style MAF from a 2002 Town car



My PI swap 96 Town car ran better with the 2002 MAF still using the stock 96 tune
_________________________
2004 MarauderM79 104K miles Jmod!! Lidio 93 tune for the track BOC 91 octane street tune 14.85 @95.63
2004 Crown Vic LX 145K Silver Birch Light flint leather FMX1 04 P-71 PCM swap 70 mm TB Custom shorting wire harness. 28/ 21mm MM swaybars Monroe severe duty shocks. Marauder subwoofer and painted cap heated mirrors. GT-500 Wheels NEED DUAL EXHAUST


Project car 74 Chevy Laguna type S-3, # match 400 SBC

Previous rides
93 P-71 2001 P-73, 94 TC Exec, 96 TC Signature

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#3565057 - 03/06/17 02:06 PM Re: Pi Swap Check Engine Light [Re: Bangster]
JLewis59 Offline
Stranger

Registered: 09/18/16
Posts: 6
Loc: Plymouth, Ohio
Here you can see the green vacuum line seems like it's too short. It just kinda slides off if i push it on all the way.

[img]https://www.flickr.com/photos/152723605@N07/32907433550/in/dateposted-public/[/img]


Edited by JLewis59 (03/06/17 02:07 PM)
_________________________
2000 Mercury Grand Marquis - 80,000 Miles - Pi Head and Intake Swap, Directed Audio and Alpine Type R 12 inch subs

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