My check engine come on and the code that i got from autozone was p0171 it was running lean. I try resetting by disconnecting the negative side of the battery, when that was done the car wont idle and it will turn off. any ideas of the problem.

so far i have repalced the coils with bhr coils, new spark plugs, and new wires.

 

Click this link! Search rx8club via Google






Could be a lot of things, but might want to clean your MAF first and check for any vacuum/air leaks.

 

Most likely a massive air leak.

Check all the hoses to the VFAD, the velocity air, and the recycled air off the oil filler extension.

Look for splits in the accordion tube just before the throttle body, very common.

Any sizable air ingress will stall the engine at idle, and throw that code.

 

well my coolant light is on. i disconnect the sensor. now i have some kind of vibration on the car. is pretty bad. it vibrate like crazy. that happens after the car is warm. itr may be. because of the coolant light or what?

 

Engine mounts are going bad...?

 

Well i dont know. How do i check the engine mounts? Other thing the mph needle sometimes go up and down for no reason.

 

if you mean the rpm needle then you def need to look for a leak.....

 

Great job on Hi-jacking someones thread

Are you sure that the vibration started the same time you disconnected the sensor? I doubt it did.

Poor idle can be caused by many things.
What year is your car, any mods, what maintenance have done?

Things like, engine mounts, coils, plugs, wires, vacuum leaks, poor compression can all cause poor idle

 

I'll play nice and give you one link. This one has some pics in it, so you can locate them.

https://www.rx8club.com/showthread.p...hlight=conical

But............you should really do some searches about "motor mounts" and not hijack someone elses thread. Here, I'll even show you how to search.....click below!

Search rx8club via Google

 

When your car is shaking when on idle, that is how you can tell your motor mounts are going bad.

 

That isn't what he asked.

You can visibly inspect your motor mounts by turning your wheel full lock on both sides and looking in. It is a short sort of cylinder with a rubber top-boot. You can visibly see if its collapsed.

 

hmmm my mazda is a 2005 , i took it to the dealer like 3 months ago to change the oil and check for leaks. they told me that it was good. well i change the spark p myself 2 weeks ago. i didnt calibrate them. i m gonna take it to the dealer next week and see what they say.

 

Huh?
Dude I feel like I'm coming in halfway thru a conversation or this was meant for another thread.

Anyway you don't calibrate spark plugs you gap them.

What are you taking it to the dealer for?
The coolant light and vibration still?

If you did the plugs yourself .. maybe you put the plug wires back on wrong?
Or maybe you didn't tighten the plugs enough ... get back in there and check both of those items.