Question about Chevrolet Tracker

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Went from 20 to 12 mi per gal in two weeks changed o2 valve and cleaned egr valve .

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  • Jeffrey Turcotte
    Jeffrey Turcotte Apr 11, 2011

    check fuel pressure regulator for torn diaphram. remove vacuum hose from regulator, plug hose, start engine, look for fuel coming out of vacuum hose. If fuel comes out, replace regulator.



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I had the same problem with my S-10 and it threw a code intermittently. There were
two problems, a cracked seal on the gas cap and an intermittent heater problem
with the mass air flow sensor. The truck ran but got terrible gas mileage with
the mass air flow sensor problem. You might be able to have the codes checked
at an autozone or other parts store that offers this service free. Also check the
coolant level at the radiator and not just the return tank, mine had become disconnected due to age and allowed coolant to escape the radiator and not
return to the block but appeared full because the line had fallen behind the battery.

Posted on Apr 11, 2011


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Loss of power

Throttle Position Sensor__ Throttle Body Cleaning___Test O2 Sensor___Check EGR Valve Clean or Replace EGR Valve.

Dec 27, 2015 | Nissan Cars & Trucks

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2003 hyundai sonata 2.4 dtc po401 have changed egr egr solenoid and plastic vaccum valve cleaned intake ports replaced o2 sensor checked wiring all the way back to computer cleaned all engine grounds...

problem is typically the sensor or the device that is being monitored by the sensor. The the EGR return pipe is not properly engineered, a cold pipe with cause the inside to gum up with carbon deposit. This pipe is used to pick up exhaust gas to dilute the air before the combustion. If this "connection" is clogged, you will have a rough time at higher speeds. Pipe is easy enough to remote and take a look inside. If the gum up is too thick, I won't spend the time to chissle this out and just buy a replacement.

Oct 22, 2013 | Hyundai Sonata Cars & Trucks

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My 2004 mercury monteray is experiencing jerking while driving up inclines. I changed the fule filter and it was real dirty when i took it off and replaced with a new one, it went away for about 3 weeks...

Spark Plugs--change every 3 years, not over 70,000 miles
Bad EGR Valve
Ignition Misfires
Worn out O2 Sensors---- change front 2 at 100,000 miles
Clean MAF Sensor-----clean- once or twice a year

Your trans failed, because the fluid has to be
changed every 3 years,30,000 miles ,power
steering also 3 years

Feb 20, 2011 | 2004 Mercury Montery

1 Answer

I have an /05 Highlander. A new short block was installed @ 74,000 mi. A week later my VSC light came on. The dealer replaced the O2 sensor & light went out..for 4 miles. Now both the eng. & VSC...

The VSC has nothing to do with the O2 Sensor,TPS Sensor or EGR Valve.

I will not express what I'am thinking,but in reality,NO Diagnostic work was done
on your vehicle.

My advice,and I don't know why the pros aren't all over me yet,is never go to a dealer.
You and thousands of others on this site alone,are perfect examples of why you
go down the street, to a local repair shop that cares.
I bet if you checked your in & out milage, that they are the same. Never road
tested,nothing,just threw parts at it at your expense.
There are good techs at dealers,but no service Mgrs that care,it is all about
taking your money and selling services you don't need. On the 5th visit they will
make the drivability repair you went there for.

Common sense: asumming they pulled codes
you never have multiple sensor failures all at one time.

Nov 29, 2010 | 2005 Toyota Highlander

2 Answers

I have a mazda b2600i p/u, 33,000 mi. Ran great, then out of the blue started to run very rough, black smoke, etc. I have had the distrb cap, plugs, plug wires, fuel filter, everything changed. Fuel...

Check the EGR valve..

EGR valve is bolted to the manifold on passenger side, just underneath the carburetor. There are three hex head screws, requires 10mm socket.

Nov 02, 2010 | 1991 Mazda B-Series

1 Answer

How do you repair codes PO141 and PO136 2000 Ford E-350 with a 5.4 engine

Causes A code P0401 most likely means one or more of the following has happened:
  • The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced, this is the common cause
  • There is a blockage in the EGR (tube), most likely carbon buildup
  • The EGR valve is faulty
  • The EGR valve may not be opening due to a lack of vaccuum
Possible Solutions In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
  • Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
  • Clean out the EGR valve and/or tubing to remove deposits
  • Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
  • Replace the DPFE sensor (with a good quality / OEM one)
  • Replace the EGR valve

Symptoms There may be no visible symptoms to the driver. Poor fuel mileage, possible misfire, depending on O2 sensor position when sticking.
Causes A code P0136 may mean that one or more of the following has happened:
  • Faulty O2 sensor leak in exhaust close to O2 sensor, faulty O2 sensor is the common cause.
  • Short to voltage on O2 signal circuit
  • Open in circuit resistance caused by corrosion in connector
Possible Solutions
  • Replace the second oxygen sensor on bank 1
  • Repair open or short in signal circuit
  • Clean corrosion from connector

Sep 16, 2009 | 2007 Ford E-350 Super Duty Length XLT

1 Answer

Keep getting a P0171. Cleaned MAF sensor. Everything seems to be in spec.

Any leak in the EGR system and problem with lazy O2 sensor will trigger P0171.

It will take time to troubleshoot this problem.

Check and clean the carbon built up on EGR valve and EGR air passage tube.

Replace the EGR base gasket.

O2 should be inspected or change if it's getting close to 36,000 miles.

Get Denso O2 sensor. It's a better by to OEM and BOSCH O2.

Please post result on the comment page.

I will follow up.

Aug 18, 2009 | 2005 Lotus Elise

2 Answers

Will not pass emissions code p0401 infuficient egr flow

EGR flow is monitored by the PCM by it looking for a reaction in the FRONT O2 sensor in responce to the command given to the EGR valve. The linear electronic EGR valve sends a return signal to the PCM indicating the relative position of the step motor and hence how far open (or closed) the EGR valve is in responce to the PCM command. The PCM expects to see (within a set of given parameters) a change in the O2 sensor reading (change in exhaust gas make up) after the EGR valve is commanded open or closed. If it doesn't, or that change is not within the expected parameters, a code will be set based on the skewed data. Generally a "insufficient flow" code will be set by:

1.Faulty EGR valve (sticking, or "lying" to the PCM about the actual valve position)
2.Faulty electrical connection at the EGR valve (causing false data)
3.Clogged EGR passages
4. Bad read from the MAP, or TPS, causing the PCM to misinterpret the EGR data based on faulty operational data from the other sensors
5. (Very rarely) A marginally "slow" O2 sensor. (PCM does not "see" the change in exhaust make up quick enough and interprets that as poor EGR flow.)
I have found that normally this code means that the EGR is not opening the amount that it has been commaneded to by the PCM. Normal cure for me lately has beed to repalce the EGR valve and to clean out the passages while the valve is off. The Tech 2 is able to command the EGR open and show the commanded opening and the actual opening. When this code is present the actual and commanded do not match closely at all. Thanks for using FixYa - a FixYa rating is appreciated for taking the time to answer your FREE question.

Mar 29, 2009 | 1999 Saturn SL

3 Answers

EGR Valve, O2 Sensor

Absolutely a bad o2 sensor can cause problems with performance. If you replace one it is highly recommended to replace both or all four depending on your vehicle. If one o2 sensor is making your vehicle run rich you will burn more fuel and in return increase the amount of carbon or unburnt fuel if you will in your egr valve you could probably get away with cleaning it but I would recommend replacing it, it will save you from having to pull it off again. Check your catyletic converter because long exposure to carbon will mess it up.

Sep 23, 2008 | 1999 Saturn SL

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