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  #1  
Old 05-06-2018, 11:16 AM
R3V_5145 R3V_5145 is offline
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Default 98 ranger 4.0 lean in both banks puzzled

98 ranger getting both p0171 and p0174 and wonít go away

Cleaned maf
New air filter
New plugs and wires
Fuel pressure good
Checked for vacuum leaks canít located any
Changed plenum gaskets

Any help would be appreciated

Cold and new start ups it bogs and idles bad till warm but once drive seems symptom free and has me puzzled
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  #2  
Old 05-08-2018, 11:23 AM
bjurke bjurke is offline
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Default Re: 98 ranger 4.0 lean in both banks puzzled

I previously had this and the wiring was burnt through for the egr valve causing a non working egr valve. Also a bad fuel pump can cause this.ie low pump pressure
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Old 05-20-2018, 02:01 PM
accorddude accorddude is offline
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Default Re: 98 ranger 4.0 lean in both banks puzzled

Is it lean at idle , cruise or both? Lean at idle is usually a vacumn leak. At cruise could be harder to pin down. Does it rev up ok?
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Old 05-20-2018, 08:32 PM
crowdpleazer crowdpleazer is offline
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Default Re: 98 ranger 4.0 lean in both banks puzzled

I have the same codes and have been ignoring it for awhile because it runs fine (unlike yours) which is not the right thing to do I know. Mine seemed to start when I had custom exhaust put on. Do you have anything different on the exhaust?
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1998 ranger extended cab, 2wd, 4.0 ohv, 5 speed, sony xploid 52 4 way watt radio, 2 pair of pioneer 240 watt speakers, Cobra 29 LX LCD CB radio pushing 100 watts, k&n air filter, 15 inch exploder wheels, dual exhaust with 4 inch stainless tips, 2 12 inch subs with a 1000 watt amp just for the hell of it!

new project: dirt track modified racing at the local saturday night track.
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  #5  
Old 07-07-2018, 06:54 AM
TxGasRacer TxGasRacer is online now
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Default Re: 98 ranger 4.0 lean in both banks puzzled

It is more than likely your upper intake o-ring gaskets. I have a 1998 4.0 super cab and I had this happen to me,after I changed out the upper intake o-ring gaskets my lean trouble codes p0171 and p0174 went away. Hope This Helps
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1998 Ranger XLT Super Cab 4.0 ohv v6 - 5r55E automatic Trans - 8.8 with 3.55gears - Toreador Red Clear Coat Metallic -Explorer Sport Trac White Faced Gage Cluster -2006 Mirror Swap

Last edited by TxGasRacer; 07-07-2018 at 06:59 AM.
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