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#1649798 - 12/30/08 12:23 AM PO173 & PO174
Tony Offline
Stranger

Registered: 01/22/06
Posts: 5
Hello all,
I have '99 CVLX that starts hard in the cold and won't idle properly unless I keep giving it gas, it also runs a little messy after warm-up. The check engine light is on and returns codes PO173 & PO174 at autozone. Any help will be greatly appreciated.

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#1649807 - 12/30/08 01:02 AM Re: PO173 & PO174 [Re: Tony]
TechnoWeenie Offline
Banned
Posting Addict

Registered: 10/02/04
Posts: 22857
Loc: UTL
disconnect the MAF sensor. If nothing changes, clean and/or replace the MAF sensor.
_________________________

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#1649871 - 12/30/08 07:04 AM Re: PO173 & PO174 [Re: TechnoWeenie]
Timmn1 Offline
Over the Hill

Registered: 09/21/07
Posts: 1919
Loc: Near I-80 & I-57
PO173 code: fuel trim bank 2, O2 (oxygen sensor) control limit

PO174 code: system too lean, bank 2
_________________________
1997 Grand Marquis - Started out life as a rental car in Milwaukee.
Mods:
Functional oil pressure gauge
Shark Plenum + Aviator throttle body
Headlight wiring

"Life after death is as improbable as sex after marriage!"

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#1650300 - 12/30/08 06:15 PM Re: PO173 & PO174 [Re: Timmn1]
Tony Offline
Stranger

Registered: 01/22/06
Posts: 5
Had it checked again today at checkers...gave me a code po171 & po174 this time...I'm cleaning the MAF today...

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#1650622 - 12/31/08 12:07 AM Re: PO173 & PO174 [Re: Tony]
TechnoWeenie Offline
Banned
Posting Addict

Registered: 10/02/04
Posts: 22857
Loc: UTL














Also, if you haven't done them, replace the plugs and fuel filter.
_________________________

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#1651030 - 12/31/08 01:05 PM Re: PO173 & PO174 [Re: TechnoWeenie]
njstatepd03cv Offline
Member

Registered: 10/10/06
Posts: 439
Loc: NJ
may need to get ur fuel tank cleaned... heres the bulliten from ford.. although it does show diffrent codes your having the same problem...

SERVICE BULLETIN:0322 NHTSA ITEM NUMBER:10002472

MFG Bulletin Date: 20030203

Component: ENGINE AND ENGINE COOLING:ENGINE

Bulletin Summary: STREAMLINED DIAGNOSTIC PROCEDURE FOR VEHICLES WITH MALFUNCTION INDICATOR LAMP (MIL) ON AND DIAGNOSTIC TROUBLE CODES (DTCS) P0401, P0402, P1400 OR P1401, OR RUNS ROUGH, LACKS POWER, SURGE, POOR FUEL ECONOMY, AND THE ABOVE LISTED DTCS WITHOUT
_________________________
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