Question about 1998 Ford Windstar

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P0174 code Engine light comes on and when hooked to code reader I get a P0174 code. Lean mixture (Band 2)

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  • Anonymous Nov 09, 2008

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I've had this problem for months, on my 1998 windstar 3.8 liter...I would clear the error with a OBD2 port device...

Check engine light may not happen again, until I drove 5 miles, then again 50 miles before problem came back...Always same error P0174.. Van ran ok..

I just looked under the hood, and there is a Rubber Elbow, right on top of the intake manafold, it joins to a plastic tube that goes to other hoses towards the firewall. The rubber elbow was mushy, not hard..Kind of decaying, due to oil residue?..I took off the badly cracked elbow (causing vacuum leak for sure) and replaced with a foot long 5/16th fuel line. I just looped the 1-foot fuel line hose in a circle, secured with couple wire ties and presto, elbow fixed with a piece of fuel line..I hope this solves my P0174 error, will find out this week. But I'm sure, the cracked rubber elbow must have had an effect on the vacuum system.

Several months ago, I went to ford dealer, when I noticed the elbow showing surface cracking, they said I'd have to buy an entire vacuum hose gizmo assembly, and All I need is the elbow. So I didn't replace the elbow.

Posted on Jan 11, 2009

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I had the two codes, p0171 and p0174, lean mixture bank 1 and 2. I found this is a common occurance, I have a 1999, 3.8L 6 CYL. The cause is the isolator bolts for the intake manifold. The original equipment bolts had rubber material not compatible with oil, the replacement bolts have a oil compatible rubber seal. The replacement kit is available from am-autoparts.com, ( Chelmsford,Ma.) the whole kit includes the new bolts ($113 from FORD), the upper and lower intake manifold gaskets, the front rocker cover modified for the EGR valve, a new egr valve and hose, and another vaccum hose. The whole kit is only 79.95, free shipping, I recieved it the next day, to Barrington NH. The repair was easy and only took a couple hours using the most basic hand tools. anyway there is a good web page that helped tremendously, http://leckemby.net/windstar/windstar01.html have fun, easy and cheap, FORD dealer wanted 300 for the parts and four hundred for the labor. Should be a free recall due to their darn DUMB engineering dept. FORD is killing America.

Posted on Nov 10, 2008

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P0174 FORD - Fuel Injection System Too lean Bank 2xicon.jpghttp://engine-codes.com/p0174_ford.htmlForum CodePossible causes- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
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- Lack of fuel
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It's a very common problem for the Ford Windstar. Here a link to a web site with information how to repair:
When is the code detected?- Fuel injection system does not operate properly.
- The amount of mixture ratio compensation is too small. (The mixture ratio is too lean.) Symptoms- Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel ConsumptionP0174 FORD Description The Powertrain Control Module (PCM) monitors the engine Air/Fuel mixture ratio, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The PCM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.

In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the PCM judges the condition as the fuel injection system malfunction and light up the engine light.

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Rough idle vibrates and po171 code service engine soon. jamesrowland9@aol.com


Hi, a Ford P0171 is a LEAN code for cylinder bank 1, and P0174 is a LEAN code for cylinder bank 2. These codes commonly occur on many Ford vehicles, and are set when the powertrain control module (PCM) sees the air/fuel mixture is running too lean (too much air, not enough fuel).
When the Check Engine Light comes on, either one of these codes, or both, may be found when a code reader or scan tool is plugged into the vehicle diagnostic connector. IF the vehicle is driven long enough, typically both codes will be set.
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Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow (because the EGR differential pressure sensor that monitors EGR flow is faulty and is under-reporting EGR flow).
If the problem is not enough fuel, the underling cause may be a weak fuel pump, restricted fuel filter, leaky fuel pressure regulator or dirty fuel injectors.

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The fuel/air mixture is too lean for the entire engine. The fuel pump pressure could be too low. The fuel pump pressure regulator could be at fault. There could be an air leak downstream of the MAF sensor. MAF sensor (hot wire type) could be dirty. Check for intake manifold vacuum leaks. The engine coolant temp sensor and/or the intake air temp sensor could be faulty (stuck at full hot mode).

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Here is two of your codes. Lean mixture on banks 1 and 2. There are 37 pages of Hyundai codes.

http://www.autocodes.com/p0171_hyundai.html

P0174 HYUNDAI - System Too Lean Bank 2

Read more: http://www.autocodes.com/p0174_hyundai.html#ixzz43IA8HGCb

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Read more: http://www.autocodes.com/p2187_hyundai.html#ixzz43IASlusU

Check all the bolts holding the plenum, and anything else concerned with air intake. Too much air means weak mixture.

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I have a code reader and the code is P0171 P0174 System too lean. what makes the system too lean?


P0171 - Fuel Injection System Too Lean Bank 1
Possible Causes:
- Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection

P0174 - Fuel Injection System Too Lean Bank 2
Possible Causes:
- Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection

What Causes These Codes: Fuel injection system does not operate properly. The amount of mixture ratio compensation is too large. (The mixture ratio is too rich.) The Powertrain Control Module (PCM) monitors the engine Air/Fuel mixture ratio, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The PCM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios. In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the PCM judges the condition as the fuel injection system malfunction and light up the engine light. The codes is usually set when there is an intake leak after the air flow meter, before replacing any parts check for loose or broken hoses and intake gasket leak. On Ford some models dirty air filter, and dirty or faulty air flow sensor are the cause of the problem.

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