An expert who has achieved level 2 by getting 100 points
An expert that got 5 achievements.
An expert whose answer got voted for 100 times.
An expert that has over 500 points.
Re: 96 Mazda B2300 when motor is cold runs ruff and...
It could be the EGR valve and a bunch of other things. Your truck is new enough it supports OBD-II. You'll need to get the trouble codes read from the truck's computer and that will tell you more information about where the problem lies. Don't guess, get those codes and do a proper diagnosis. You can look up the codes at http://www.check-engine-light.com Good luck!
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
What kind of idling problem ? An what year Mazda ? Idle is controlled by the engine computer via a IAC motor , idle air control valve or motor, what ever Mazda calls there set up ! Or if a fairly new vehicle, they use drive by wire or electronic throttle control . With the idle air control set up passages get plugged an don't allow enough air to by pass the throttle plate causing stalling problems . A vacuum leak can cause a ruff unstable idle an stalling also . A dirty throttle plate can cause idle problems as well ! A scan tool ,not a code reader is a very use full tool to check engine data parameters. With the scan tool you can view idle air control counts . To see if the engine computer is actually controlling the idle air control valve . Idle Air Control Valve
Also an engine misfire can cause idle problems , also clogged fuel injectors can as well . A good diagnostic technician would start with hooking up a professional grade scan tool , checking for DTC'S - diagnostic trouble codes , misfire data , engine sensor data , IAC counts ! Section 20 Idle Speed Controls lecture preview
head lights.? on? hot or cold engine, ? both? i guess? you are parked, and in neutral, and the engine stalls. the #1 reason for stalls is a stuck open EGR main valve. clean it. there are other reasons, but above must be good to proceed. others. motor running way lean, diagnose that. use a scan tool , you in USA?
Try replacing your Idle Air Control valve. I am a former Ford tech and have two LTC's a 94 and a 96. I have had to do this job on both. When they get up in miles, the IAC valve gets carboned up and can't adjust the air/fuel intake mixture under load. If you still have a stalling issue after that, then you will probably have to replace the EGR valve as well. But it is very important that you start the engine with the old EGR valve removed so you can blow any carbon balls out of the EGR passage before installing the new EGR valve. Otherwise you will just end up plugging and ruining the new EGR valve and have the same stalling issue. Good luck!
Replace the temperature sending unit/sensor. This sensor tells the computer to put the engine into cold start mode and it then sets idle a bit higher and puts a bit more fuel into the engine to keep it running without having to touch the throttle. Once it's warm, sensor tells computer to go to normal run mode and it's done. No problem.
Most likely if it is temperature related you may have a temperature sensor that is failing. The sensor may not be reacting properly to the actual temperature and causing the engine to run rich in warmer weather when a richer setting is not required.
You could have a sticking injector or sticking EGR valve or a faulty TPS switch, all can cause a rich condition and a poor running engine.
Is the service engine light on or come on at some point?
I would start by having the car scanned for trouble codes. You can have the scanned at no cost to you at your local Auto Zone or Advance Auto Parts. Write the codes down and respond back.
Your EGR valve shouldn't open up during idle or the engine will run rough and may even stall. Remove it and clean the plunger and port with a wire brush and some carb cleaner. Test the diaphragm with a vacuum pump. If it doesn't work after cleaning, or the diaphragm is bad, buy a new EGR valve.