Testing the Throttle body with a multi-meter (weird one here)
02-29-2020, 09:42 PM
#1
Testing the Throttle body with a multi-meter (weird one here)
Anyone have a guide for testing voltage resistances and wires for the TPS / Drive by wire system?
Iam having a wiring issue that is making my car go absolutely INSANE.
The Story
This problem is a little out of my league so forgive my ignorance.
My TPS / Drive by wire is going absolutely crazy and its going to be a bit of a story so here goes nothing. As many of you know i purchased my rx-8 a few months ago with lots of small problems including over heating. I restored her to about mint condition and everything was fine..... until this and its a weird one...
So one day i was driving down the road when my gas peddle stopped working......
I pulled over and disconnected my TPS / Drive by wire and reconnected it. Everything back to normal. This problem slowly started getting worse, until it started making my idle rough and my car hard to start. My rx8 is running ULTRA rich since this started and is even back firing like a 1950s car. Since this started sometimes it tosses lots of random engine codes, including a bad OMP. But the OMP is fine as i tested it and is partly driven by the drive by wire system. I have a sona oil adapter kit on the car and i have been checking it often. So back to the story, one day i was driving down the highway when large clouds of smoke started pouring out my exhaust, i thought for sure i just blew an oil seal and my engine was toast. No like i said this gets weird..... very weird..... so large clouds of smoke filling the entire highway being poured out of my rx-8. 30 seconds later it stopped, all was back to normal..... At this point i was very confused... my oil levels were not over filled and for some reason it looked like my engine blew up. A day later another issue when the gas peddle stopped working. I pulled over to reconnect the drive by wire system. Problem solved again temporary.... But i noticed it seemed as if the oil levels on my sona kit had dropped very fast.
Few days later more giant clouds of smoke, random miss firing, than back to normal. Hey all my sona oil is gone besides a few drops....... and my OMP cel is on..... Few days later my car is having problems starting when warm, sometimes it stutters around 2k rpm and sometimes it gets stuck in limp mode and causes a nightmare. Ive been closely monitoring this for almost a month, i have even replaced the throttle body and no changes.... It has slowly been getting worse, sometimes if i wiggle the throttle body wires it all goes away sometimes for a day and sometimes for 5 minutes. Sometimes in the morning it even smokes for a bit and its not the oil or coolant.... its gas.... so much of it that if you smelled it, you would almost pass out. Now to make things even more confusing, i decided to do something stupid and power wash the throttle body and connector.... BAM problems SOLVED. all issues vanished..... from a wash..... anyway i know this is going to return soon and its causing my car to go insane and i need to go-ahead and figure out where this wire short is. The OMP also adjust oil input according to the Drive by wire.... which explains why my sona oil is always vanishing into thin air.... since this happened. I have never in my life encountered such a weird car issue. Anyway magically my wires are setting in the perfect place after the power wash and this has not happened for a long time now, but i know it will return with a vengeance. I need to find this short and bad wire. I am not that great with electrical testing so i need a run down on what readings and settings i need to be looking at on a multi meter and how to test the wires off the throttle body.
Iam having a wiring issue that is making my car go absolutely INSANE.
The Story
This problem is a little out of my league so forgive my ignorance.
My TPS / Drive by wire is going absolutely crazy and its going to be a bit of a story so here goes nothing. As many of you know i purchased my rx-8 a few months ago with lots of small problems including over heating. I restored her to about mint condition and everything was fine..... until this and its a weird one...
So one day i was driving down the road when my gas peddle stopped working......
I pulled over and disconnected my TPS / Drive by wire and reconnected it. Everything back to normal. This problem slowly started getting worse, until it started making my idle rough and my car hard to start. My rx8 is running ULTRA rich since this started and is even back firing like a 1950s car. Since this started sometimes it tosses lots of random engine codes, including a bad OMP. But the OMP is fine as i tested it and is partly driven by the drive by wire system. I have a sona oil adapter kit on the car and i have been checking it often. So back to the story, one day i was driving down the highway when large clouds of smoke started pouring out my exhaust, i thought for sure i just blew an oil seal and my engine was toast. No like i said this gets weird..... very weird..... so large clouds of smoke filling the entire highway being poured out of my rx-8. 30 seconds later it stopped, all was back to normal..... At this point i was very confused... my oil levels were not over filled and for some reason it looked like my engine blew up. A day later another issue when the gas peddle stopped working. I pulled over to reconnect the drive by wire system. Problem solved again temporary.... But i noticed it seemed as if the oil levels on my sona kit had dropped very fast.
Few days later more giant clouds of smoke, random miss firing, than back to normal. Hey all my sona oil is gone besides a few drops....... and my OMP cel is on..... Few days later my car is having problems starting when warm, sometimes it stutters around 2k rpm and sometimes it gets stuck in limp mode and causes a nightmare. Ive been closely monitoring this for almost a month, i have even replaced the throttle body and no changes.... It has slowly been getting worse, sometimes if i wiggle the throttle body wires it all goes away sometimes for a day and sometimes for 5 minutes. Sometimes in the morning it even smokes for a bit and its not the oil or coolant.... its gas.... so much of it that if you smelled it, you would almost pass out. Now to make things even more confusing, i decided to do something stupid and power wash the throttle body and connector.... BAM problems SOLVED. all issues vanished..... from a wash..... anyway i know this is going to return soon and its causing my car to go insane and i need to go-ahead and figure out where this wire short is. The OMP also adjust oil input according to the Drive by wire.... which explains why my sona oil is always vanishing into thin air.... since this happened. I have never in my life encountered such a weird car issue. Anyway magically my wires are setting in the perfect place after the power wash and this has not happened for a long time now, but i know it will return with a vengeance. I need to find this short and bad wire. I am not that great with electrical testing so i need a run down on what readings and settings i need to be looking at on a multi meter and how to test the wires off the throttle body.
03-01-2020, 09:28 AM
#2
Registered
Sounds like a vacuum issue that caused the omp to hard dump that much oil into the engine. Have you compression tested the car since all this happened? Could be an electrical or sensor issue as well but I would check vacuum lines first. Wiring should be easy to find online but if you need more detail the service manual is a good buy. Helped me countless times.
edit: more detail on your car? At least the model year.
edit: more detail on your car? At least the model year.
Last edited by CaymanRotary; 03-01-2020 at 09:40 AM.
03-01-2020, 11:49 AM
#3
The OMP isn't capable of injecting that much oil. At peak rate it's still like 2L/hour.
Giant clouds of smoke usually mean oil barfing into the intake and ingesting through there. Any signs of that?
How is your cat? Blowing it to pieces can also produce smoke clouds and you have a history of backfires and running rich.
Lots of codes without a clear common cause usually come down on what they have in common: the electrical system. You powerwashed (wtf) electronic components which might have completed a circuit somewhere until it dries up. I would go over the grounding points and battery terminals. Test charging voltage from the alt.
Giant clouds of smoke usually mean oil barfing into the intake and ingesting through there. Any signs of that?
How is your cat? Blowing it to pieces can also produce smoke clouds and you have a history of backfires and running rich.
Lots of codes without a clear common cause usually come down on what they have in common: the electrical system. You powerwashed (wtf) electronic components which might have completed a circuit somewhere until it dries up. I would go over the grounding points and battery terminals. Test charging voltage from the alt.
03-02-2020, 11:43 PM
#4
REW Club
Yeah the power wash could compound the issue down the road..
Electrical problems are the devil.. I leave these things to the pro’s. Just search around google and use Rx8 club in the search and maybe you’ll come up with something. Definitely sounds like a miscommunication between the sohn and the ecu.
Like the gentlemen before me said, check your cat because if it wasn’t toast before it probably is now. A bad cat will destroy your engine
Electrical problems are the devil.. I leave these things to the pro’s. Just search around google and use Rx8 club in the search and maybe you’ll come up with something. Definitely sounds like a miscommunication between the sohn and the ecu.
Like the gentlemen before me said, check your cat because if it wasn’t toast before it probably is now. A bad cat will destroy your engine
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