Limp mode or compression loss? - RX8Club.com



RX-8 Discussion General discussion about the RX-8 that doesn't fit in one of the specialty forums.

Reply
 
 
 
Thread Tools Search this Thread Rate Thread
Old 07-20-2015, 06:47 PM   #1  
Registered
Thread Starter
 
Join Date: Mar 2015
Posts: 114
Thanks: 0
Thanked 0 Times in 0 Posts
Limp mode or compression loss?

Was driving the 8 today it was a pretty hot day and i started up from a stopsign reved to about 7k and then it sputter a bit seemed like fuel cut then it died started it up tried it again same thing happened was able to drive home below 7k but it had two or three random cuts around 3- 4 k and one at idle for a long time the car was running for like 3 hours today so does limp mode do that and is compression loss let you drive sometimes or can you not move at all or run the car kinda freaking out my mechanic says it may be because of the cat
tbiggybig is offline   Reply With Quote
Old 07-20-2015, 07:07 PM   #2  
Registered
Thread Starter
 
Join Date: Mar 2015
Posts: 114
Thanks: 0
Thanked 0 Times in 0 Posts
Also i have a pending misfire code (it misfired a few times after it hit the 7k shut off or w.e and the cat efficency code and a network code (probably because i bumped into the code reader
tbiggybig is offline   Reply With Quote
Old 07-20-2015, 07:14 PM   #3  
Registered
 
Join Date: Jul 2015
Posts: 18
Thanks: 0
Thanked 0 Times in 0 Posts
If it was compression loss you would have no power and just be over rev. But also if your having miss fire it cant cause that, id recommend a compression test and a pressure test on your fuel pump cause if no fuel pressure can cause stalling and loss of power. Its happened in my mazda 3 and my buddys 8
Js000456 is offline   Reply With Quote
Old 07-20-2015, 08:01 PM   #4  
Registered
 
Join Date: Jul 2015
Posts: 18
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by tbiggybig View Post
Also i have a pending misfire code (it misfired a few times after it hit the 7k shut off or w.e and the cat efficency code and a network code (probably because i bumped into the code reader
If its your cat then your car is being stopped up by emission this can cause carbon build up and can choke your car out, pretty much like suffication to the engine this could cause it to shut off, but still run some codes to see if its a fuel pump issue cause sometimes it could cause stalls like you mentioned and a miss fire will just make you run rough but still fix it
Js000456 is offline   Reply With Quote
Old 07-20-2015, 08:21 PM   #5  
Registered
Thread Starter
 
Join Date: Mar 2015
Posts: 114
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Js000456 View Post
If it was compression loss you would have no power and just be over rev. But also if your having miss fire it cant cause that, id recommend a compression test and a pressure test on your fuel pump cause if no fuel pressure can cause stalling and loss of power. Its happened in my mazda 3 and my buddys 8
I dont think its fuel pump because it works fine like its a legit cut like completely throttle goes to 0 and shuts of like you turn off you engine at 7k but i could check it
tbiggybig is offline   Reply With Quote
Old 07-20-2015, 08:26 PM   #6  
Registered
Thread Starter
 
Join Date: Mar 2015
Posts: 114
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Js000456 View Post
If its your cat then your car is being stopped up by emission this can cause carbon build up and can choke your car out, pretty much like suffication to the engine this could cause it to shut off, but still run some codes to see if its a fuel pump issue cause sometimes it could cause stalls like you mentioned and a miss fire will just make you run rough but still fix it
It only misfires once when i rev past 7k then the fuel cuts and the car shuts off even if i throw it in neutral i slowly reved it to 7k and held it there and it didnt shut off but idk maybe because it stoped limping one time it stalled smelled like alot of oil then the next time it stalled smelt more like coolant third time had a burnt rubbery plastic smell then the 4th had just a normal exhaust smell so idk if that makes a different maybe because combustion is wasnt complete when it misfired back fired and fuel cut im replacing the cat friday its been causeing problems for awhile maybe the 8 had enough of its **** haha
tbiggybig is offline   Reply With Quote
Old 07-20-2015, 08:26 PM   #7  
Registered
Thread Starter
 
Join Date: Mar 2015
Posts: 114
Thanks: 0
Thanked 0 Times in 0 Posts
Also i thought if fuel pumps go they just go and stop working entirely
tbiggybig is offline   Reply With Quote
Old 07-20-2015, 08:30 PM   #8  
Registered
 
Join Date: Jul 2015
Posts: 18
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by tbiggybig View Post
It only misfires once when i rev past 7k then the fuel cuts and the car shuts off even if i throw it in neutral i slowly reved it to 7k and held it there and it didnt shut off but idk maybe because it stoped limping one time it stalled smelled like alot of oil then the next time it stalled smelt more like coolant third time had a burnt rubbery plastic smell then the 4th had just a normal exhaust smell so idk if that makes a different maybe because combustion is wasnt complete when it misfired back fired and fuel cut im replacing the cat friday its been causeing problems for awhile maybe the 8 had enough of its **** haha
Idk about a rubber smell, but if the missfire is that bad id recommend a tune up, plugs wires, and check coil packs that rubber smell might be a plug wire touching metal and burning or something of that nature but if its back firing it could be a engine rotor messing up, id go with the cheapest first before going all out
Js000456 is offline   Reply With Quote
Old 07-20-2015, 08:32 PM   #9  
Registered
 
Join Date: Jul 2015
Posts: 18
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by tbiggybig View Post
Also i thought if fuel pumps go they just go and stop working entirely
Not entirely true they can go either way most people believe they can stop working all at once but they still have pressure in them cause of the lines so thats 50-50 there
Js000456 is offline   Reply With Quote
Old 07-20-2015, 08:35 PM   #10  
Registered
Thread Starter
 
Join Date: Mar 2015
Posts: 114
Thanks: 0
Thanked 0 Times in 0 Posts
Alright ill have to check all this out tomorrow my mechanic also said it could be because it was extremely hot today and the engine didnt like it it was like 95 degress with 80% humidity air movement sucked even flying down the highway doing 80
tbiggybig is offline   Reply With Quote
Old 07-20-2015, 08:37 PM   #11  
Registered
 
Join Date: Jul 2015
Posts: 18
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by tbiggybig View Post
Also i thought if fuel pumps go they just go and stop working entirely
As far as the burning oil smell goes take a piece of paper (has to be white) get someone to rev your car 2-3 at 4000-7000rpm and put paper behind exhaust if you see oil on paper then your seals might be going out, but if its just water or a clear fluid its normal
Js000456 is offline   Reply With Quote
Old 07-20-2015, 08:39 PM   #12  
Registered
 
Join Date: Jul 2015
Posts: 18
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by tbiggybig View Post
Alright ill have to check all this out tomorrow my mechanic also said it could be because it was extremely hot today and the engine didnt like it it was like 95 degress with 80% humidity air movement sucked even flying down the highway doing 80
yeah humidity is hard on alot of engines I work as a technician at a dealership and we get A/C probs alot but its not its cause of the heat an humidity
Js000456 is offline   Reply With Quote
Old 07-20-2015, 08:41 PM   #13  
Registered
Thread Starter
 
Join Date: Mar 2015
Posts: 114
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Js000456 View Post
As far as the burning oil smell goes take a piece of paper (has to be white) get someone to rev your car 2-3 at 4000-7000rpm and put paper behind exhaust if you see oil on paper then your seals might be going out, but if its just water or a clear fluid its normal
The oil seals? Or some other seals
tbiggybig is offline   Reply With Quote
Old 07-20-2015, 08:44 PM   #14  
Registered
Thread Starter
 
Join Date: Mar 2015
Posts: 114
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Js000456 View Post
yeah humidity is hard on alot of engines I work as a technician at a dealership and we get A/C probs alot but its not its cause of the heat an humidity
Yeah thats what the mechanic was telling me if it that know of anyway to prevent that? Or no maybe this will all go away tomorrow thatd be great dont have to fix anything not enough air could cause a misfire right? And i heard the maf sensor can throw it into limp but isnt limp usually set at 3k the strange thing is the whole 7k fuel cut thing had me panicing haha thought it died on me
tbiggybig is offline   Reply With Quote
Old 07-20-2015, 08:45 PM   #15  
Registered
 
Join Date: Jul 2015
Posts: 18
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by tbiggybig View Post
The oil seals? Or some other seals
Apex seals, most people dont know that trick. A friend showed me that. If you see oil on paper then your apex seals are close to going out, and its not from anything youve done wrong it could be from simple stuff like wear an tear every vehicle can have this happen not just rotary engines
Js000456 is offline   Reply With Quote
Old 07-20-2015, 08:48 PM   #16  
Registered
 
Join Date: Jul 2015
Posts: 18
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by tbiggybig View Post
Yeah thats what the mechanic was telling me if it that know of anyway to prevent that? Or no maybe this will all go away tomorrow thatd be great dont have to fix anything not enough air could cause a misfire right? And i heard the maf sensor can throw it into limp but isnt limp usually set at 3k the strange thing is the whole 7k fuel cut thing had me panicing haha thought it died on me
humidity can really mess with the MAF if its high enough that goes to any car, new, used, or old. Piston or rotary. Where you red lining alot today?
Js000456 is offline   Reply With Quote
Old 07-20-2015, 08:52 PM   #17  
Registered
Thread Starter
 
Join Date: Mar 2015
Posts: 114
Thanks: 0
Thanked 0 Times in 0 Posts
I did a few times (probably alot i got used to doing it so much on the highway like every shift to 4th) andhe was telling me a couple of the cars at his shop wouldnt even crank over at all either
tbiggybig is offline   Reply With Quote
Old 07-20-2015, 08:59 PM   #18  
Registered
 
Join Date: Jul 2015
Posts: 18
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by tbiggybig View Post
I did a few times (probably alot i got used to doing it so much on the highway like every shift to 4th) andhe was telling me a couple of the cars at his shop wouldnt even crank over at all either
Yeah that can happen, humidity is hard on every vehicle. And no theres no way to fix humidity an stop it, I wont lie an say there is just when humidity is up give your engine time to cool, and dont redline as much if you redline alot on a day with high humidity your car is just sucking in hot air and it makes the MAF feel like its choking sometimes even though it wont through a light right away it will sneak up on you and do what it did today out of the blue. But id redline the car if I was to park, or just at a stop sign if you do it while your driving your intake is receiving more air cause of your engine working harder an your air flow around your car moving toward you so your intake is getting even more
Js000456 is offline   Reply With Quote
Old 07-20-2015, 09:02 PM   #19  
Registered
Thread Starter
 
Join Date: Mar 2015
Posts: 114
Thanks: 0
Thanked 0 Times in 0 Posts
I thought it was bad to redline them without a load on the engine lol ive been wrong alot today haha im going to try driving it again in a bit its cooler out now im hoping it just needed a rest haha
tbiggybig is offline   Reply With Quote
Old 07-20-2015, 09:09 PM   #20  
Registered
 
Join Date: Jul 2015
Posts: 18
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by tbiggybig View Post
I thought it was bad to redline them without a load on the engine lol ive been wrong alot today haha im going to try driving it again in a bit its cooler out now im hoping it just needed a rest haha
No its better to redline with no load, cause you get the full power and blows more carbon build up out of your engine, if you do it while your driving your doing yourself no good cause your engine is at high rpms and its already burning, but when you do it after youve slowed down the engine cools some and the carbon begins to lay and calm down then when you are at a stop you can blow all of that out. Do this everytime you park, and if you drive over 30miles and come back home go outside after your car has cooled off and crank the car give it 5-10 mins to warm up and blow out the carbon then turn it off and it will make your apex seals last 3xtimes longer but only do this after the car has warmed up ok
Js000456 is offline   Reply With Quote
Old 07-20-2015, 09:12 PM   #21  
Registered
Thread Starter
 
Join Date: Mar 2015
Posts: 114
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Js000456 View Post
No its better to redline with no load, cause you get the full power and blows more carbon build up out of your engine, if you do it while your driving your doing yourself no good cause your engine is at high rpms and its already burning, but when you do it after youve slowed down the engine cools some and the carbon begins to lay and calm down then when you are at a stop you can blow all of that out. Do this everytime you park, and if you drive over 30miles and come back home go outside after your car has cooled off and crank the car give it 5-10 mins to warm up and blow out the carbon then turn it off and it will make your apex seals last 3xtimes longer but only do this after the car has warmed up ok
Makes sense if my seals arent already gone ill start doing that haha
If i am losing compression think a decarb will help at this point or probably not
tbiggybig is offline   Reply With Quote
Old 07-20-2015, 09:19 PM   #22  
Registered
 
Join Date: Jul 2015
Posts: 18
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by tbiggybig View Post
Makes sense if my seals arent already gone ill start doing that haha
If i am losing compression think a decarb will help at this point or probably not
If your loosing compression you need to replace your seals nothing will help im just being honest with you I wouldnt lie to you and say yes. And decarb? A rotary is all injected it dont have a carb in it. But just get a compression test done by mazda dont go anywhere else. Its a little pricey, but for your pressure test for the fuel system go to a ford dealership their testing prices are better and their machines are "BG" brands they have the best pressure test system in my opinion. But if it is seals look up atdkins rotary its got after market parts and they have seals and O-rings for cheap for your engine and they last longer too then factory seals do
Js000456 is offline   Reply With Quote
Old 07-20-2015, 09:31 PM   #23  
Registered
Thread Starter
 
Join Date: Mar 2015
Posts: 114
Thanks: 0
Thanked 0 Times in 0 Posts
Alright ill look into thank you very much for the advice. But now that im putting it all together seems like today it was just being sufficated bad cat (most likely gutted) and crazy humidity choking the air coming in maybe tomorrow will be better if it was compression loss it would just die not start etc wouldnt even be able to reach 7k right? It would Struggle to get to 3k it didnt have that problem could be fuel pump so ill check that and ill check the seals with a piece of paper anyways wouldnt it have a bit of oil burnt to it due to the oil injection for the seals anyways though?
tbiggybig is offline   Reply With Quote
Old 07-20-2015, 09:38 PM   #24  
Registered
 
Join Date: Jul 2015
Posts: 18
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by tbiggybig View Post
Alright ill look into thank you very much for the advice. But now that im putting it all together seems like today it was just being sufficated bad cat (most likely gutted) and crazy humidity choking the air coming in maybe tomorrow will be better if it was compression loss it would just die not start etc wouldnt even be able to reach 7k right? It would Struggle to get to 3k it didnt have that problem could be fuel pump so ill check that and ill check the seals with a piece of paper anyways wouldnt it have a bit of oil burnt to it due to the oil injection for the seals anyways though?
With compression loss it couldnt pull, youd loose all power it be like a turtle and wouldnt pull the car youd rev the rpms but thats all, and for the burning oil smell with it being so hot your engine may have just been burning more oil then it would regualry, so check your oil level and coolant too. And sometimes if engines get too hot or too much humidity they will shut off but its rare though. And yeah if you have any questions shoot me a message id be more then happy to help and if I dont know id find out and study up an let you know.
Js000456 is offline   Reply With Quote
Old 07-20-2015, 09:39 PM   #25  
Registered
Thread Starter
 
Join Date: Mar 2015
Posts: 114
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Js000456 View Post
With compression loss it couldnt pull, youd loose all power it be like a turtle and wouldnt pull the car youd rev the rpms but thats all, and for the burning oil smell with it being so hot your engine may have just been burning more oil then it would regualry, so check your oil level and coolant too. And sometimes if engines get too hot or too much humidity they will shut off but its rare though. And yeah if you have any questions shoot me a message id be more then happy to help and if I dont know id find out and study up an let you know.
Thank you very much nice to have friends on here haha
tbiggybig is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Limp mode help tjohnmeyer Series I Trouble Shooting 12 09-28-2017 05:03 PM
Is there a recommended full rebuild kit? Shnifty Series I Tech Garage 23 12-18-2015 12:49 PM
No power after 4000rpm mdl0209 Series I Trouble Shooting 5 10-05-2015 10:43 AM
Will not start or turn over...dead cliffkemp Series I Trouble Shooting 7 10-03-2015 11:11 PM
I changed engine Eliseo Esquivel RX-8 Discussion 2 09-30-2015 08:28 PM


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 08:21 PM.


© 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.