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

Registered: 09/18/16
Posts: 2
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.

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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: 355
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: 2
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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#3547658 - 02/16/17 01:09 PM Re: Pi Swap Check Engine Light [Re: JLewis59]
casey67 Online   content
n00b

Registered: 12/25/16
Posts: 30
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: 3758
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.
_________________________
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: 1974
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.
_________________________
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: 40117
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)
_________________________

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: 7897
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: 40117
Loc:
Sorry, musta missed the head part. Yea, no need for RTV then.
_________________________

1985 Grand Marquis
2002 Volvo V70

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