Technical Car Experts Answers everything you need: engine runs lean

Showing posts with label engine runs lean. Show all posts

Saturday, January 19, 2013

Chrysler Van System Too Lean Bank 1

OBD Error Code P0171 On Chrysler Van

Chrysler Van will not Start

The starter turn over right but Engine will not start and Error code P0171 comes up.
n these case first see if you could hear the fuel pump turning ON when you crank/ start the engine.

Normally when you turn the key to start and start to Run you hear fuel pump running noise for 1-2 seconds.Hear that noise.If that fuel pump start noise is not heard then its fuel pump start up failure.

NOW why these code P0171 gets set:----

Engine running rich or Engine running Lean all is controlled by PCM.
The powertrain control module (PCM) has control and ability to watch the upstream oxygen sensors to know how rich or lean the engine is running. It has the ability to compensate for rich or lean conditions up to an extent. Suppose if the PCM detects Engine running lean, then in that condition it will start adding more and more fuel to try to bring it back to the correct range. It can add up to about 33% more fuel, and if it still can't bring the ratio back into the correct range then it will set this fault code. This could be a bad upstream oxygen sensor or MAP sensor, fuel quality issue, but in your case it was most likely caused by low fuel pressure.So first get the fuel pressure tested,these will help to confirm the problem.

As per our Auto garage repair experience ,With code P0171 set and you not hearing the pump run plus a no start condition is pointing to a likely fuel pump failure.
So first check fuel pressure,then check for power and ground at the pump connector while a helper cycles the key on and off or cranks the engine. If the pump does have power and ground but won't run then it will need to be replaced.If the pump has power but pressure is less then also pump is faulty.Also it can be faulty fuel pump relay,as power is not there.

The fuel pump relay is located in the box under the hood which you could try swapping with another and see if that helps but it's unlikely. Relays very seldom fail.

To measure the fuel pressure the simple procedure is as follows :--

Remove the fuel line from the rail and install a T hose inline and then attach the fuel pressure gauge to the T hose. There isn't a test port on the fuel rail itself on your Chrysler Van model.

Many a times confirming the fuel pump start up noise becomes very difficult.In that case take the help of helper.

As per Chrysler Van the pump connector is easily accessed, it clips up to the frame right behind the fuel tank located towards the center of the tank area.

With the chime going off when turning the key on it can be tough to hear the pump. It would be best to have a helper back near the tank or a helper turning the key while you listen back there.

For mode help and information regarding fuel pump connector ,There are four wires in the connector. The one to be checked are black/light green which is ground, and the fuel pump driver wire is dark blue/orange.

These details will help.
Thanks.

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Friday, October 5, 2012

Fuel Running Lean

Engine Running Lean and Also check engine light is ON.

The Vehicle is 1999 Ford Explorer

Common problem noticed on fords and other vehicles too.

At our repair garage many customer visits with same types of issues like ...........

Lean running engine runs hotter
Running Lean
Fuel Bank 1 and 2 running lean
Fuel running rich lean
Car running lean fuel
Fuel injection running too lean

And many such other similar types of problems are noticed by customers.

In most of such cases the check engine light comes ON.

In that case the vehicle needs to be scanned for error codes which are stored in its engine control module.

On most of cases the error codes retrieved are

C1230,C1102, P0443,P0171,P0174.

As for 1999 ford explorer vehicle. These problem is very common.On 1999 Ford Explorer it had known issues with leaking upper intake gasket and due to this lean codes get set.

For this problem,as per our garage repair experience I would suggest you to start with installing a fuel pressure gauge to the fuel rail service port and make sure you have 32 to 45 PSI and if so, remove and replace the upper intake along with the mounting bolts and this should resolve the problem you having.If the fuel pressure is less then its required PSI,then i suggest you to get the fuel pump and fuel filter inspected and replaced.

This is what the error codes tell and explains.

The codes P0171 and P0174 are lean codes and are mostly set because the upper intake gasket is leaking and needs to be replaced.

Also because many other ford explorer 4.0 users have noticed same issue like yours and had complained about this ,so for these reason Ford has released a redesigned gasket set to correct this concern.

AND FOR OTHER COMMON ERROR CODES NOTICED:---

The OBD code P0443 is usually a canister purge control issue but also low vacuum can effect this as well so the better place to start is correcting the intake leak and clear all code and see if any reset.

The codes C1230 and C1102 are in most cases set due to a bad rear speed sensor or the connection to it. The speed sensor is located in the top of the rear differential housing for ford explorer vehicle.

On most of such cases the OBD codes retrieved are P0171 and OBD code P0174.

These details will help.

Thanks.

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Wednesday, February 8, 2012

Ford runs lean and idles rough?

Many ford and other car models notice this problems,the best thing is to check the error codes stored in car computer,if you get steady check engine light on dash.But if there is no code stored in cars computer ECM.Then the most common cause is the pcv hose leaking on this engine , it is the molded PCV hose. It will crack and leak, but may be very hard to see it. Start with taking a close look at the PCV hose. and where it connects.

This will help.

Thanks.

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