Idle issues (merged with Rx8 stalls at idle. help me!) - Page 7 - RX8Club.com



Series I Trouble Shooting This is the place to learn more about or discuss any issues you're having with your RX-8

Reply
 
 
 
Thread Tools Search this Thread Rate Thread
Old 03-08-2018, 01:51 PM   #151  
New Member
 
Join Date: Jul 2017
Posts: 2
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by RotaryMachineRx View Post
What you really need to do is get a decent OBDII reader and give us information like Mass air flow, fuel trims (LTFT & STFT), AFR, MAF voltage, coolant temps, etc etc all at idle.

Have you cleaned the ESS at all? Its prone to getting metal gunk stuck to it as it is magnetic (Essentric shaft sensor located below crank pulley)?

It doesn't sound like a compression issue but that doesn't mean much. Rule number 1 when buying an rx8 or an engine for it, get compression test results before purchase!
The all of the sensors are clean. I'll pick one of those readers up, but I can't really give you readings at idle because it doesn't idle :p
And yeah no doubt about getting proof of compression! I thought I did but looking back on it, the pictures he gave me could have easily been old or just plane fake since I didn't ask for a timestamp and the motor was all ready pulled when I bought it. Owell, live and learn. My dad's buddy at the Mazda dealership might be able to get us a working rotary compression tester it it comes down to it bit hopefully the data I get will get to the bottom it

Edit: what would be the best way to gather readings since there is no idle? Just try to hold it at 2krpm?

Last edited by Ross Svensson-Hornbostel; 03-08-2018 at 02:01 PM.
Ross Svensson-Hornbostel is offline   Reply With Quote
Old 03-13-2018, 09:46 AM   #152  
SPOOLN8
iTrader: (1)
 
RotaryMachineRx's Avatar
 
Join Date: Nov 2008
Location: Edmonton, Alberta, Canada
Posts: 1,719
Thanked 39 Times in 38 Posts
^ That's a good question. Any information would be better than nothing but I'm not entirely sure how skewed the results would be by holding an RPM with the gas pedal. If you could hold it around 1000rpm that would be better (closer to idle RPM).

Unfortunately it being an engine installed by yourselves throws a wrench into things making it really hard to determine the underlying problem.

Last edited by RotaryMachineRx; 03-13-2018 at 09:49 AM.
RotaryMachineRx is offline   Reply With Quote
Old 07-14-2018, 10:21 AM   #153  
Registered
 
Join Date: Jul 2016
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Idling dying

Had my 07 rx8 which has 115 k on it for 3 years. When i bought it i replaced coils and wires and plugs. Never had issues with it till this week. Died on me 4 times at lights signs where im idling. Hooked a cheap cpu to it for codes....none popped. Engine light is not on. Pretty generic with my issues. Took it to a shop and let them try to find it. They said they drove it 3 seperate times and it never died so they couldnt find anything. Upon leaving shop at a light.....dead again. Any help?
Lightninglarry is offline   Reply With Quote
Old 07-14-2018, 01:03 PM   #154  
转子之魂
 
UnknownJinX's Avatar
 
Join Date: Apr 2017
Location: Victoria, BC
Posts: 1,258
Thanked 169 Times in 158 Posts
Do you have any fuel trim data? Could be a vacuum leak.
UnknownJinX is online now   Reply With Quote
Old 07-14-2018, 01:32 PM   #155  
Registered
 
Join Date: Jul 2016
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by UnknownJinX View Post
Do you have any fuel trim data? Could be a vacuum leak.
sorry not too savvy. How can i do this?
Lightninglarry is offline   Reply With Quote
Old 07-14-2018, 04:45 PM   #156  
转子之魂
 
UnknownJinX's Avatar
 
Join Date: Apr 2017
Location: Victoria, BC
Posts: 1,258
Thanked 169 Times in 158 Posts
If you have an OBD2 reader that can read live data, then you could look at your STFT and LTFT. If they are very high, then you have a vacuum leak and that can cause stalling at idle.

Some of the Bluetooth ones are capable of reading live data and can connect to your smartphone with the Torque app.
UnknownJinX is online now   Reply With Quote
Old 07-14-2018, 11:16 PM   #157  
SHINEY 8!!
iTrader: (1)
 
scottish's Avatar
 
Join Date: Aug 2009
Location: Donmills,Toronto
Posts: 268
Thanks: 0
Thanked 1 Time in 1 Post
Oh Lord UnknownJinX and Loki you guys have got to give up trying to help people with there issues by saying Hmmm a Data log would help better to diagnose.

The reason why these people ask for help is because the don't know how to fix cars in the first place and your asking for Data Logs. lol

Have you guys actually owned anything else other than your 8s?
Are your 8s your first cars and your fresh out of high School?

I suggest you guys go and read up on the stickies and study the FSMs and TSBs before offering any more advice on how to fix cars.
scottish is offline   Reply With Quote
Old 07-14-2018, 11:33 PM   #158  
SHINEY 8!!
iTrader: (1)
 
scottish's Avatar
 
Join Date: Aug 2009
Location: Donmills,Toronto
Posts: 268
Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by Lightninglarry View Post
Had my 07 rx8 which has 115 k on it for 3 years. When i bought it i replaced coils and wires and plugs. Never had issues with it till this week. Died on me 4 times at lights signs where im idling. Hooked a cheap cpu to it for codes....none popped. Engine light is not on. Pretty generic with my issues. Took it to a shop and let them try to find it. They said they drove it 3 seperate times and it never died so they couldnt find anything. Upon leaving shop at a light.....dead again. Any help?
Hmm three years since you replaced them. whats the mileage on these coils?

Is It Hard to turn over after it stalls out?

Hot and cold Start issues?

Get a rotary specific compression test performed.

Check your air intake, screen is present and filter is installed correctly.
clean your MAF.
clean your ESS.
You may have to revisit your coils, plugs and wires again depending on the mileage on them.

And last but not least and what I consider the next most important thing next to the coils, wires and plugs is the fuel pump assembly!!!!
yours has a 115K miles on it.
Replace the pump if your compression test comes back good needs it anyways because there is a non serviceable fuel filter in there that everyone doesn't even think about.

Keep us posted on what fixes it.

Good luck.
scottish is offline   Reply With Quote
The Following User Says Thank You to scottish For This Useful Post:
UnknownJinX (07-14-2018)
Old 07-14-2018, 11:36 PM   #159  
转子之魂
 
UnknownJinX's Avatar
 
Join Date: Apr 2017
Location: Victoria, BC
Posts: 1,258
Thanked 169 Times in 158 Posts
Okay, that's actually some good advice.

Sorry man, your approach works.

Should probably keep some basic things in mind...

To add, make sure everything in the intake is connected correctly, and make sure the accordion tube is not cracked.

Last edited by UnknownJinX; 07-14-2018 at 11:41 PM.
UnknownJinX is online now   Reply With Quote
Old 07-14-2018, 11:51 PM   #160  
转子之魂
 
UnknownJinX's Avatar
 
Join Date: Apr 2017
Location: Victoria, BC
Posts: 1,258
Thanked 169 Times in 158 Posts
Quote:
Originally Posted by scottish View Post
Oh Lord UnknownJinX and Loki you guys have got to give up trying to help people with there issues by saying Hmmm a Data log would help better to diagnose.

The reason why these people ask for help is because the don't know how to fix cars in the first place and your asking for Data Logs. lol

Have you guys actually owned anything else other than your 8s?
Are your 8s your first cars and your fresh out of high School?

I suggest you guys go and read up on the stickies and study the FSMs and TSBs before offering any more advice on how to fix cars.
To answer your question, no, my 8's not my first car, but I am definitely not as experienced as you are, and you know what you are talking about, so I will listen to your advice of checking for common causes of a problem first before acquiring numbers.
UnknownJinX is online now   Reply With Quote
Old 07-15-2018, 12:41 AM   #161  
SHINEY 8!!
iTrader: (1)
 
scottish's Avatar
 
Join Date: Aug 2009
Location: Donmills,Toronto
Posts: 268
Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by UnknownJinX View Post
Alright, so what's your expert advice? Guess and throw random parts at it until something works?

Here is a list of causes for stalling at idle straight from the Service Manual, wanna go through it one by one?

No battery power supply to PCM or poor GND
Vacuum leakage
Air leakage from intake-air system parts
Air suction at intake-air system (between MAF sensor and intake ports)
Air cleaner restriction
Improper operation of drive-by-wire control system
Throttle body malfunction (stuck closed)
Poor fuel pressure
Inadequate fuel pressure
Pressure regulator malfunction (integrated in fuel pump unit)
Fuel pump body mechanical malfunction
Fuel pump resister malfunction (open)
Fuel leakage from fuel injector
Fuel injector (FP) (RP) clogging
Jet air mixing system malfunction (restriction or leakage at air passage)
Open or short circuit in fuel pump body and related wiring harness
Restriction in exhaust system
Purge solenoid valve malfunction (stuck open)
Improper air/fuel ratio control (abnormal signal from ECT sensor to PCM)
MAF sensor improper installation
No signal from eccentric shaft position sensor due to sensor, related wire
or wrong installation
Electrical connector disconnected
Low engine compression
Engine internal malfunction
Abnormal engine oil condition (viscosity, deterioration)
Low oil pressure
Excessive fuel pressure
Air mixed in oil line
Metering oil pump malfunction
Leakage or clogging in oil pipe
Leakage or clogging in oil nozzle
A/C system operation is improper
Engine overheating
Abnormal engine oil condition (viscosity, amount, deterioration)
Spark leakage from high-tension leads
Ignition coil malfunction
Immobilizer system and/or circuit malfunction
Immobilizer system operates properly (Key is not registered)

A Bluetooth data reader is a handy tool to have by your side anyway. I don't know why you would NOT have one.

And to answer your question, no, my 8's not my first car.
Yay! finally some one has pulled out the FSM and found chapter 11.

Lol No I don't throw random parts at an issue.I fully investigate what the issue maybe using all the info I can find and I carry out the basic tests first that can be done with basic hand tools but if I have aftermarket parts then I keep the stock ones for diagnostic purposes.

Question does the FSM say anything other than to check what DTCs that have been clocked and nothing about Data logging AFRs and fuel trims to pin point exactly what component in which system that has failed? No.

So when you see that list for multiple types of failures do you just cry and say screw it and just go straight to doing endless Data logs and don't want to get your hands dirty.

Funny thing too is the PCM will try to correct any incorrect combustion conditions within a certain + or - % of what it should be. So its giving you out of whack values anyways telling you what to much or to little fuel hmm problem somewhere in the fuel system, to much or to little air hmm vacuum leak or blockage somewhere in the air intake system, Timing,no spark or not enough spark hmmm problem in the ignition system. well that narrowed it down to one or all of the 4 systems that gets the engine to run.

Pro tuners and engine builders use Data logging to diagnose way more complexed systems than a simple engine of a production line and then again they check the basics first.

At the end of the day an engine is an engine since the day it was invented the fundamentals haven't changed other than now we have fancy electronics running the show but an engine is still an engine and that includes rotary too no different than pistons. Basic fault finding skills.

You Don't see Mechanics reaching for Data loggers they reach for Dtc code readers and fancy specifically made ASTs and the FSM to assist them with diagnosing problems and if they can't then they call in to their tech centres for further support.

You do know the list is a flow chart of yes and no's of multiple issues to direct you to what component that may or not be causing the failure.

LOL You can probably pick off about 70% of that list just by checking the basics that I have listed on other recent posts of mine and fix 99% of the problems people are having and if not then move on to the next step it tells you to go look at it.

You and Loki should both try reading through that whole chapter from start to finish and you might be able to assist someone with there problem faster and more accurately.

Yes I do have a Cobb Accessport and to be honest it lives in the glovebox now just incase I have to take my tune out or I need to check a code. Don't bother with Data logging anymore but only if I have issues at the track and my tuner requests it.

We all drive rx8s on this forum and we all have the same issues how we describe these issues doesn't make the problem any different from anyone else.

Last edited by scottish; 07-15-2018 at 01:13 AM.
scottish is offline   Reply With Quote
Old 07-15-2018, 12:52 AM   #162  
转子之魂
 
UnknownJinX's Avatar
 
Join Date: Apr 2017
Location: Victoria, BC
Posts: 1,258
Thanked 169 Times in 158 Posts
I hear you, sorry about what I said.

Yeah next time someone/I encounter a problem, I will follow through the Service Manual and try to troubleshoot with that. Thanks for the advice again.
UnknownJinX is online now   Reply With Quote
Old 07-15-2018, 01:14 AM   #163  
SHINEY 8!!
iTrader: (1)
 
scottish's Avatar
 
Join Date: Aug 2009
Location: Donmills,Toronto
Posts: 268
Thanks: 0
Thanked 1 Time in 1 Post
No need to apologize we are all trying to help each other and maybe we may learn something new along the way.
scottish is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
New car! Needs uprated starter or worse..? [Video] RayBarron New Member Forum 4 10-19-2015 08:08 PM
Need some help not your typical low rpm issue rotorsnsaabs New Member Forum 11 08-26-2015 08:21 PM
Please help Quato_jr New Member Forum 4 08-04-2015 09:22 AM
Possible Throttle Body issues digitalmonkey79 New Member Forum 5 07-29-2015 12:09 AM
Need expert advice. New cat STILL glowing with reman dbarber Series I Trouble Shooting 14 07-25-2015 01:34 PM


Tags
2005, 400, 500, back, batery, battery, change, dies, doesnt, idle, idling, mazda, replace, rx8, stall, stalls

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 03:23 AM.


© 2018 MH Sub I, LLC dba Internet Brands
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.