P0171 possible causes......

check these equipments


Front HO2S malfunction
Excess air suction in intake-air system
Leakage exhaust gas
MAF sensor malfunction
Fuel line pressure malfunction
Fuel pump unit malfunction
Leakage fuel
Ignition system malfunction
High-tension lead malfunction
Incorrect power supply to ignition coil
Ignition coil malfunction
Insufficient compression
Metering oil pump malfunction
Engine oil condition malfunction
Rised oil pressure
Oil passage malfunction
Engine malfunction
Fuel injector malfunction
PCM malfunction

 

check for these

1st...it'll give u an idea what you are dealing with

– APP
APP (Accelerator pedal position) % • Accelerator pedal released: 0%
• Accelerator pedal depressed: 100% • The following PIDs
– APP1, APP2
• APP sensor


– ECT
ECT (Engine coolant temperature) °C
• Ignition switch at ON position: Indicate the ECT • ECT sensor
V • ECT 20 °C {68 °F}: Approx. 3.1 V
• ECT 80 °C {176 °F}: Approx. 0.9 V

Check: 2K

– MAF

Mass airflow) g/s MT

• Idling after warm-up: 3.8-4.7 g/s
• Engine speed 2,500 rpm (no load): 8.7-11.7 g/s
AT

• Idling after warm-up: 4.4-5.3 g/s
• Engine speed 2,500 rpm (no load): 9.5-12.5 g/s • MAF sensor
MT

• Idling after warm-up: 1.16-1.23 V
• Engine speed 2,500 rpm (no load): 1.49-1.64 V
AT

• Idling after warm-up: 1.21-1.29 V
• Engine speed 2,500 rpm (no load): 1.54-1.67 V


Check : 5N


– TP

TP1 (TP sensor 1) % • CTP: 8.0-16.0%
• WOT: 76.5-81.9% • TP sensor No.1
• CTP: 0.40-0.80 V
• WOT: 3.825-4.095 V
TP2 (TP sensor 2) % • CTP: 23.6-35.6%
• WOT: 80.66-86.06% • TP sensor No.2

Check : 1M 1J – VSS


This is where the location is .... the wiring harness(located at the side panel)

 

Where i am now? Probably: Insufficient compression & PCM malfunction.
The rest i've checked by myself (i don't believe mechanics here ... they just BS around)

 

Is there any way to confirm that ECU malfunction?

 

actually i'm suspecting ignition coils though....afterall you are having idling problems....

What about the power of the car.... any power loss below 3krpm?

 

boonyloh now a day be doctor 8 liao....

 

Dont think so..... Do you know what's a four piston engine running with just 3 pistons fells like??.... Like boony says it's very likely the ignition coil has been damage....... Borrow the ignition coils from your fren to test it out.......

 

Wood, your car got so many aftermarket parts.....

 

Coil packs are okay. I've checked every single of them.

I'm not aware of power loss ... since i had "engine start / no idling problem"

 

Yeah i know. I've a charade 3 piston ... i xperienced running with 2 piston.

Borrow?? I'd prefer to buy a new one.

 

I think this is what responsible for your cat.......


@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
MONTEREY, Calif. -- After suffering a black eye from disclosing that it won't count RX-8 owners' opinions in its internal customer-satisfaction scores, Mazda says it may have to replace the engines in many of its flagship sports cars.

The voluntary recall of all 2004 and 2005 vehicles, and some 2006s, is expected to be announced this week or next. It involves damage to the catalyst resulting from oil leaks in the RX-8's rotary engine. Any engine that does not pass a vacuum test must be replaced, said Robert Davis, head of product development and quality at Mazda North American Operations.

Engines prone to failing the test are mostly in hot climates and use synthetic oils.

Mazda also will check each RX-8's battery and starter, which tend to fail in cold climates.

"We're going to give these cars the white-glove treatment," Davis said. "We would rather replace the engine than have the dealer crack them open."

Davis would not disclose the projected failure rate of the engines or the cost to replace them.

Mazda has a remanufacturing center in North Carolina that will rebuild faulty engines and return them to service.

The recall comes after a video Webcast by two dealers who attended the July 11-13 National Dealer Advisory Council meetings in Newport Beach, Calif., was leaked on the Internet.

In the video, dealers said problems with the RX-8 were unfairly lowering Mazda customer-satisfaction scores.

Mazda informed the dealers that RX-8 owners would continue to be surveyed, but that the responses would not factor into dealer
customer-satisfaction scores. See story here

Mazda has issued service bulletins on such trouble spots as squeaky
brakes and engine flooding.
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

 

now i'm feeling i'm a part from that.

 

oh damn.... do u use synthetic?

 

I do.

 

how about 2003 model??...
does it mean everyone kene tukar new cat or what....

 

i think this means buka engine.

 

wah, siao! just imagine how much mazda has to spend to compensate all their mistakes, changing all the engines *phew* i wouldnt wanna own mazda at this point of time... hehe

 

i never use fullysyn oil. i'm using semisyn instead. helix plus & then change to trust RE (blue)

 

i got good news 4 myself. 4th Sep Mr.Rodrigues from Maztech coming to Brunei to tune some rx7s. I already ask the man who bring him here to check out my car. Wish me luck!!

 

Good Luck man!

 

thanx man!!

 

Your luck has turn better......Good for you.....

 

Thanks mate. I'm desperate to be a lucky guy

 

i'm still using full syn since day one

 

all the part just make my car havy nia ....now my 8 running very slow ......