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Author Topic:   Running Rich
Thud
Gearhead

Posts: 1115
From: Cumming,Ga.,USofA
Registered: Jun 99

posted 01-30-2003 07:59 AM     Click Here to See the Profile for Thud     Edit/Delete Message   Reply w/Quote
I must have done something to PO the Red Truck!

I'm getting a "173" code (o2 sensor indicates a rich condition). I've changed the o2 sensor, spark plugs, air filter, and cleaned the throttle body... The problem is still there. Next I'll check out the fuel regulator and, possibly, the throttle position sensor.

Anybody got any insights or suggestions?

------------------
"My doctor says I have a malformed public duty gland and a natural deficiency in moral fiber; and that I am, therefore, excused from saving universes." ... Ford Prefect

Dwayne

M&M Member #18
'94 Lightning #942 of 4007
'70 Mach1
2 '69 Cyclone Spoiler II's (that are for sale)
'65 Galaxie 500 + parts car

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SteveLaRiviere
Administrator

Posts: 36138
From: Saco, Maine
Registered: May 99

posted 01-30-2003 08:23 AM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Any vacuum leaks? Sticky injector? Pull the plugs and see if you can narrow it down to a cylinder.

------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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Thud
Gearhead

Posts: 1115
From: Cumming,Ga.,USofA
Registered: Jun 99

posted 01-30-2003 09:19 AM     Click Here to See the Profile for Thud     Edit/Delete Message   Reply w/Quote
I've considered an injector problem, but all plugs looked identical (sooty, but not horrible) so I've kinda backed away from that...

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"My doctor says I have a malformed public duty gland and a natural deficiency in moral fiber; and that I am, therefore, excused from saving universes." ... Ford Prefect

Dwayne

M&M Member #18
'94 Lightning #942 of 4007
'70 Mach1
2 '69 Cyclone Spoiler II's (that are for sale)
'65 Galaxie 500 + parts car

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SteveLaRiviere
Administrator

Posts: 36138
From: Saco, Maine
Registered: May 99

posted 01-30-2003 09:30 AM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Does it seem to be running well? Can you stall it with your hand?

Didn't Lightnings have a problem with the gasket between the upper and lower intake manifolds drying up and causing vacuum leaks?

------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

Please remember our sponsors,
Mustangs Plus, NPD, Osborn Reproductions, MyFordPerformance.com, and FordRamAir.com

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Thud
Gearhead

Posts: 1115
From: Cumming,Ga.,USofA
Registered: Jun 99

posted 01-30-2003 10:06 AM     Click Here to See the Profile for Thud     Edit/Delete Message   Reply w/Quote
It runs great (especially now with the new plugs and clean air-filter), except at an extended stop (red-light, etc.). It will drop idle RPM then surge to 1100, drop idle RPM then surge to 1100, etc. I've never heard of a gasket problem on old Lightnings, but I've also considered pulling the upper intake to clean it, and clean the throttle body better. Also it makes the fuel pressure regulator and throttle position sensor much easier to access. Oh yes, the check light is intermittent. It's on probably 30% of the time, usually at 35 to 50 MPH.

------------------
"My doctor says I have a malformed public duty gland and a natural deficiency in moral fiber; and that I am, therefore, excused from saving universes." ... Ford Prefect

Dwayne

M&M Member #18
'94 Lightning #942 of 4007
'70 Mach1
2 '69 Cyclone Spoiler II's (that are for sale)
'65 Galaxie 500 + parts car

IP: Logged

SteveLaRiviere
Administrator

Posts: 36138
From: Saco, Maine
Registered: May 99

posted 01-30-2003 06:10 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Try to stall it with your hand.

------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

Please remember our sponsors,
Mustangs Plus, NPD, Osborn Reproductions, MyFordPerformance.com, and FordRamAir.com

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Thud
Gearhead

Posts: 1115
From: Cumming,Ga.,USofA
Registered: Jun 99

posted 02-07-2003 07:24 PM     Click Here to See the Profile for Thud     Edit/Delete Message   Reply w/Quote
It was the fuel pressure regulator. For some reason the red truck didn't like running with 80+ pounds of fuel pressure at the injectors...

------------------
"My doctor says I have a malformed public duty gland and a natural deficiency in moral fiber; and that I am, therefore, excused from saving universes." ... Ford Prefect

Dwayne

M&M Member #18
'94 Lightning #942 of 4007
'70 Mach1
2 '69 Cyclone Spoiler II's (that are for sale)
'65 Galaxie 500 + parts car

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MLariviere
Moderator

Posts: 3578
From: Biddeford,Me.USA
Registered: May 99

posted 02-08-2003 11:03 PM     Click Here to See the Profile for MLariviere   Click Here to Email MLariviere     Edit/Delete Message   Reply w/Quote
Try bumping up the advance? Can you say P-O-W-E-R!

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4Zsnow
Journeyman

Posts: 51
From: Western Washington, USA
Registered: May 2002

posted 02-09-2003 11:19 PM     Click Here to See the Profile for 4Zsnow     Edit/Delete Message   Reply w/Quote
LOL.......ignore the "ping noise"

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Thud
Gearhead

Posts: 1115
From: Cumming,Ga.,USofA
Registered: Jun 99

posted 02-10-2003 06:33 AM     Click Here to See the Profile for Thud     Edit/Delete Message   Reply w/Quote
It was the regulator. Truck is MUCH happier with 35-40 pounds of fuel pressure.

------------------
"My doctor says I have a malformed public duty gland and a natural deficiency in moral fiber; and that I am, therefore, excused from saving universes." ... Ford Prefect

Dwayne

M&M Member #18
'94 Lightning #942 of 4007
'70 Mach1
'65 Galaxie 500 + parts car

IP: Logged

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