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1997 Ford Thunderbird Electrical/OBD2

Tiny
ASHLEYKILLSME123
  • MEMBER
  • 1997 FORD THUNDERBIRD
  • 97,000 MILES
When I bought the car cel was on. I scanned the codes it said all four o2 sensors were shot. The car has a studder at idle and while driving but only at low rpm's I also noticed that the electric cooling fan comes on when I turn the key to on position and the car will only turn over untill the fan stops. As soon as the fan tuns of she fires I'm told that that is a relay problem in the ccrm not the PCM. Anyway I changed all four o2 sensors and cleared the codes and its still throwing codes for the o2 sensors. I was told that this could be the maf sensor or PCM. Havnt tested either of them yet but when you pull the maf sensor plug while it runs it wants to almost die instantly. I have replaced all o2 sensors, plugs and wires, Pcv, air and fuel filters and changed the oil. I know these cars are notorious for problems with the maf and PCM so I'm wondering if I'm heading in the right direction? Any help would be appreciated. Thanks
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Monday, November 11th, 2013 AT 11:40 AM

7 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check the two relays i've pointed out these dont' have anything to do with the pcm andit says where this module is located so the relays won't be hard to find.
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Monday, November 11th, 2013 AT 12:03 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Forgot what are the code numbers as well
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Monday, November 11th, 2013 AT 12:04 PM
Tiny
ASHLEYKILLSME123
  • MEMBER
  • 6 POSTS
Thanks for the quick reply. Ill have to go run the codes again when I get out of work but I believe they were bank 2 sensors 1 & 2 po155 and po161 or something along those lines also said something about lean condition from sensor 1. And pending codes on bank 1 sensors 1&2. They are all brand new oe style o2s that maybe have 100 miles on em. How do I test those relays you spoke of? Thanks
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Monday, November 11th, 2013 AT 12:44 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If you are getting a lean condition check fuel pressure with a gauge first auto parts rent them. Low fuel pressure will cause that as well as a vacuum leak. But get back with correct codes
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Monday, November 11th, 2013 AT 12:46 PM
Tiny
ASHLEYKILLSME123
  • MEMBER
  • 6 POSTS
Will do, thanks
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Monday, November 11th, 2013 AT 1:25 PM
Tiny
ASHLEYKILLSME123
  • MEMBER
  • 6 POSTS
P0155, p0161, p1151, p0135, p0141
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Monday, November 11th, 2013 AT 4:50 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
For the all of these check for a leak in air system from maf to throttle body or any engine grommet leaky or bad also check for air leaks in exaust and fuel pressure with a gauge. Also check for a plugged exaust system if vacuum on intake is 15" or less then suspect a clogged converter /exaust. Fuel pressure should be 30-45psi with key on engine off. Anything out of range then it's a bad pump if lower and bad regulator if higher. If replacing pump make sure to replace fuel filter as well.
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Tuesday, November 12th, 2013 AT 5:45 AM

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