Mazda 323 bj not exccelerating

SOURCE: buick lesabre nightmare 2

• The PCM doesn't even see the O2 sensor until engine temp has reached operating temp,the vehicle goes from open loop when cold,to closed loop when warm,where the PCM uses the O2 sensor to measure the rich/lean of the exhaust content,and from that,adjust fuel richness to achieve 14.7 to 1 air/fuel ratio.So when cold,the O2 sensor is out of the picture anyways.When unplugging sensors,it can be deceitful.The PCM has a program whereas,if a critical sensor (such as the mass air flow) is somehow damaged and out of the picture,the PCM will substitue a generic value that will allow the engine to stay running.So,by unplugging the MAF,it did try to run on it's own better than plugged in,there's the problem area.The vehicle is running better with the MAF unplugged,because the MAF is likely bad,and the PCM is substituting it's generic value when it IS unplugged.Something to recheckThe PROM update is a newer program for the PCM,and likely won't fix it unless the PCM is bad.I would try a good used PCM as a last or later resort,because i have seen my fair share of defective PCM's too.I have taken some PCM's apart,and found capacitors that had gone bad and leaked all over the circuit board,mostly Honda and Mitsubishi and Chrysler though.Good luck,keep me posted.

SOURCE: engine light on 2002 mazda protege is on even after changing o2

Try cleaning the Mass Airflow (MAF) Sensor. My 2002 Protege check engine light came on and it started stalling at stoplights if I didn't keep the engine revved a little. Manager at AutoZone checked the computer code for the light (P0171?), and it said it was running lean. He suggested I try the MAF sensor cleaner they have ($6.99) rather than replacing the 02 sensor, etc.; it made a *significant* difference. (I think I need to do it again to get it totally cleaned out, but the can is for at least 4 cleanings.) The MAF sensor is the large component that air goes through right after the air filter. If you don't have the repair manual for the car (search online for PDF's), you search for the part online to see what it looks like. Mainly, it's a tube about 4" across with some small wire things inside. The cleaner can said it was a 10 minute job; mine took 20 minutes, but only because the tube leading from the MAF sensor to whatever is next (a kind of bent elbow tube, with a couple of accordian-style ripples) tore, and I had to duct-tape that up to seal it. (Still haven't gotten that replaced - found them online for ~$40. Maybe this weekend...)

SOURCE: 2001 aztek misfire ad stalls when gas is given

before you spend anymore have it hooked up to a real time engine analyser like a bdm pro, or a snapon scanner, take it for a drive and snapshoot scanner when the problem arises, could be a sensor like tps or an actuator, but will not register a code, just a flag

SOURCE: I have a 2005 pt

Thisa sounds like a worn TPS on the throttle body. Although there are literally dozens of sensors that provide critical data to the engine management computer of a modern, fuel-injected engine, few are actually adjustable, or can be affected by adjustments of related components. The throttle position sensor, often referred to as the TP sensor or TPS, is one of these rare devices.


It is important to get to know the function and servicing of this sensor for a couple of reasons. As with any electro-mechanical moving part, they have been known to malfunction or ultimately just plain wear out. Besides that, they are often victims of improper service procedures. These procedures will either result in damage to the sensor, or impair its range of operation. In any event, a malfunctioning, damaged, or misadjusted TPS will cause a variety of driveablility symptoms, often accompanied by a check engine MIL (malfunction indicator light) displayed on the instrument panel.

You can follow this vidio and see how to check the TPS if it needs replacing and how to set the new one up to operate correctly. Just click onto the provide link below & good luck!

http://www.youtube.com/watch?v=A_4Us8z9Q3g

Reynaldo Andico

• 2431 Answers
• Posted on Aug 07, 2011

SOURCE: car idles rough & wants

You have 2 faults going on this is common failure patter a idle air control and egr open, the 02 sensor was not at fault it was reporting the engine condition and had nothing to do with the stalling listen to the engine you may find a vacuum hose rupture follow it along the pcv valve you mainly have a vacuum leak or a open egr