Question about 2003 Mazda B-Series

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03MazdaB3k 3.0u195k idles rough and getting13/15mpg.replaced plugsdoubleplatinum/wires/comp test 120/135 on all cly/coil/vac lines/evp purge and vent/injectors/cam sensor/maf/iac/tps/timing chain.

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  • Robert A. Watson
    Robert A. Watson Apr 03, 2015

    Jeff, I have been conducting further research. It appears the 3.0 liter engine you have has a known issue with the Camshaft Synchronizer. Change the camshaft sensor at the same time to save yourself some access trouble later. Cheers!

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  • Mazda Master
  • 774 Answers

EGR valve is faulty is my educated guess, could be other things. Do yourself and US a big favor and buy two things. I) a Haynes manual for your car and look at the chapter on emission controls, and 2) buy an inexpensive fault code reader. They will both pay for themselves in their first use!

Posted on Apr 03, 2015

  • 7 more comments 
  • Jeff Graham Apr 03, 2015

    Thanks. I have a code reader but there are no codes. I will get a manual and see what I can find

  • Jeff Graham Apr 03, 2015

    Ya this 3.0 does not have a egr valve

  • Robert A. Watson
    Robert A. Watson Apr 03, 2015

    Jeff, carefully follow the vacuum diagram inside the hood and inspect every connection. You obviously have a fuel mixture problem with such rotten gas mileage. Your car has one or two Oxygen sensors (made by DENSO) which provide feedback to the ECM to adjust the fuel/air mixture. There should be a fault code for these though. Clear the codes and check again mate. Are you sure the plug wires are good and have been connected back to the proper cylinders? Does it idle rough in Neutral or just when you place it in Drive?

  • Jeff Graham Apr 03, 2015

    Ok I have had 2 different makes of wire on it and been over the firing order several time. It idles better in park and neutral about 900 to 1k It's more like a getting to much fuel than a misfire I have hooked to a scanner and all fire looks good. I have plugged off the evap lines and replaced all the vacuum lines I can find to.

  • Robert A. Watson
    Robert A. Watson Apr 03, 2015

    Jeff, I did some research on your engine. It has a common problem. If it is the same 3.0 l as in the Mazda 6, it has individual ignition coils for each cylinder. These often fail, You will have to check them for continuity. The best replacements are DENSO. The other common problem is the catalytic converter. The tend to rot out restricting the back pressure even further. To validate the soundness of your exhaust system get a light ball pean hammer and gently tap the mufflers and catalytic converter. What you are listening for is a rattle, the catalytic converter should be clear as a bell... when they degrade the pieces or ceramic wafer material just rattles around. The other common problem are cracks in the intake hose manifold... black plastic things that go from the air box to the Mass Flow Meter. The cracks are not easily seen as they tend to form on the edges or joints of the plastic. You will have to remove them and squeeze a bit and really look hard. Check your PCV valve and its hose carefully. Let me know what you find. The manual will help you diagnose a bad ignition coil on one of the cylinders.

  • Jeff Graham Apr 03, 2015

    Thank you for your help. Just a little back ground on my self I have been in automotive parts in dealerships for 20 years and turned a few wrenches to. I have never seen this problem before agean thank you for your help. Ok this engine is the same as a ford 3.0 it has one coil I have put 2 difrint ones on it no change. I will check the air inlet hose closely and let you know what I find. As the converter I will see what I can do. If I loosen the pipes at the manifold or remove the upper O2 sensors would that tell if it's the exhaust?

  • Robert A. Watson
    Robert A. Watson Apr 03, 2015

    No, you can't tell by looking, typically there is a fault code from bad O2 sensor(s). If the engine were running well in neutral and park, I would suspect a torque solenoid, but yours has me baffled.

  • Jeff Graham Apr 03, 2015

    Me to

  • Jeff Graham Apr 03, 2015

    Me to. No cracks in the air pipe.

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  • Mazda Master
  • 10,875 Answers

Tps sensor

Posted on Apr 02, 2015

  • 2 more comments 
  • Jeff Graham Apr 02, 2015

    Already tried a tps

  •  johnny rebel
    johnny rebel Apr 02, 2015

    motor is getting old,shouldnt of spent so much on it,now it is rings and valves and valve job

  • Jeff Graham Apr 02, 2015

    I have 1700 in this truck and it clean so not to bad when it books for 5k

  •  johnny rebel
    johnny rebel Apr 03, 2015

    consider selling or a new motor

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Posted on Nov 04, 2013

SOURCE: 1997 buick lesabre- scan codes

How about a blocked exhaust converter

They only last 12 to 14 years, under perfect
fuel trim conditions, with no misfires & you have
those or did

You changed the fuel filter & checked pressure at the motor?

IAC-Idle air control--so no--idle control is not your problem

Posted on Oct 08, 2014

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