yes, it's quite common for it to crack.
P0133 Related to loss of power?
- Thread starter LC4LIFE
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yes, it's quite common for it to crack.
Well it was worth a shot but we took it off and inspected it then sprayed starting fluid on it while running and no difference in idle at all.
Polar Bear
Is it supposed to sound like that?
Anyone have any ideas? We're down to throwing parts at it, and I'm looking in the direction of the throttle position sensor. All the tests show it's fine, but this seems to make the most sense with the symptoms it's got. It still occasionally kicks out a rear O2 sensor code (they both tested at 13 ohms), but at $130 a piece my budget is screaming.
I just hate poking blindly in the dark with my checkbook
I just hate poking blindly in the dark with my checkbook
Polar Bear
Is it supposed to sound like that?
Well, I took it to the dealer and they put the Scangauge II on it (could have almost bought one myself for the same price
).
They got it to repeat the same symptoms I had been experiencing, and found that the truck ran much better when the fuel pressures were increased using the scanguage II. They noticed that at partial throttle settings the fuel pressure relay was not switching to the high setting until WOT was applied and the system went into open loop phase. Then it switched to the high setting, cleaned right up and ran great. Weird thing is that it never throws a CEL!
They said there was some data the ECU was supplying that was not making any sense, and suspected that the ECU may have gotten some water in it during the water crossings that day of wheeling. We didn't notice any water in the carpets that day, but then we didn't pull the panel to inspect the ECU for moisture either. The water was up to the bottom of the mirrors for a brief period.
They cleaned and tested the MAF sensor, but it didn't change anything.
They confirmed that there were random times that the throttle position sensor went into the open loop briefly, but in their opinion not often enough to warrant the current behavior.
Their suggestions were to replace the TPS, remove clean and balance the injectors, and possibly replace the engine ECU.
I ordered a new TPS, installed it myself, and cleared the computer but no change in behavior.
Now I'm down to replacing the ECU ($1300+ from Cdan), and/or pulling the injectors for a rebuild and balance. The computer behaving wonky after getting wet I understand, but the injectors just suddenly crapping the bed unless at WOT?
Searching for rebuilt/used ECU's- what models/years are compatible with a 97 80? I found a 96 LX450 but wasn't sure if it would work.
Thanks in advance! Opinions, lies, and conjecture are welcome...
). They got it to repeat the same symptoms I had been experiencing, and found that the truck ran much better when the fuel pressures were increased using the scanguage II. They noticed that at partial throttle settings the fuel pressure relay was not switching to the high setting until WOT was applied and the system went into open loop phase. Then it switched to the high setting, cleaned right up and ran great. Weird thing is that it never throws a CEL!
They said there was some data the ECU was supplying that was not making any sense, and suspected that the ECU may have gotten some water in it during the water crossings that day of wheeling. We didn't notice any water in the carpets that day, but then we didn't pull the panel to inspect the ECU for moisture either. The water was up to the bottom of the mirrors for a brief period.
They cleaned and tested the MAF sensor, but it didn't change anything.
They confirmed that there were random times that the throttle position sensor went into the open loop briefly, but in their opinion not often enough to warrant the current behavior.
Their suggestions were to replace the TPS, remove clean and balance the injectors, and possibly replace the engine ECU.
I ordered a new TPS, installed it myself, and cleared the computer but no change in behavior.
Now I'm down to replacing the ECU ($1300+ from Cdan), and/or pulling the injectors for a rebuild and balance. The computer behaving wonky after getting wet I understand, but the injectors just suddenly crapping the bed unless at WOT?
Searching for rebuilt/used ECU's- what models/years are compatible with a 97 80? I found a 96 LX450 but wasn't sure if it would work.
Thanks in advance! Opinions, lies, and conjecture are welcome...
Polar Bear
Is it supposed to sound like that?
Well, the fueling problem is now fixed. 
I ordered some of the regular tune up stuff it badly needed from CDan (plugs, cap & rotor, fuel filter) and adjusted the throttle position sensor (WTF does the FSM mean "adjust clockwise until the meter begins to deflect"? We used a digital Fluke and used our best guess).
When that didn't work out, I put some feelers out on Mud for a used '97 ECU and found one in Jersey- Thanks Scamper!
It arrived last week but I was tied up with lots of overtime until today. I pulled the old one, plugged in the new one and voila! Fixed! She runs super smooth with no hesitation or signs of fueling maladies. Probably will get better mileage now with plugs that aren't burned down to a nub either
There was no sign of water contamination on or near the ECU, so I think it may have been the heavy bouncing and dusty conditions that may have broken a solder joint in the box partially. Whatever- as long as my steed is back up and running properly. Now I can get back to the all important task of modifying it!!!
Good things that came out of this month and half long ordeal of diagnostics: I learned a ton about this engine and the electronics, I crawled through every filth encrusted corner of the engine bay and discovered what areas were lacking in terms of needed maintenance, and I headed off some potential problems that were waiting to strand me somewhere inconvenient.
Looks like the next big thing to do is the front axle service as my left birf is making noise and showing signs of weeping. Off to make an appointment with TorFab as my
skills are not up to this level of repair.
Thanks to everyone who contributed their ideas, experience and knowledge!
I ordered some of the regular tune up stuff it badly needed from CDan (plugs, cap & rotor, fuel filter) and adjusted the throttle position sensor (WTF does the FSM mean "adjust clockwise until the meter begins to deflect"? We used a digital Fluke and used our best guess).
When that didn't work out, I put some feelers out on Mud for a used '97 ECU and found one in Jersey- Thanks Scamper!
It arrived last week but I was tied up with lots of overtime until today. I pulled the old one, plugged in the new one and voila! Fixed! She runs super smooth with no hesitation or signs of fueling maladies. Probably will get better mileage now with plugs that aren't burned down to a nub either
There was no sign of water contamination on or near the ECU, so I think it may have been the heavy bouncing and dusty conditions that may have broken a solder joint in the box partially. Whatever- as long as my steed is back up and running properly. Now I can get back to the all important task of modifying it!!!
Good things that came out of this month and half long ordeal of diagnostics: I learned a ton about this engine and the electronics, I crawled through every filth encrusted corner of the engine bay and discovered what areas were lacking in terms of needed maintenance, and I headed off some potential problems that were waiting to strand me somewhere inconvenient.
Looks like the next big thing to do is the front axle service as my left birf is making noise and showing signs of weeping. Off to make an appointment with TorFab as my
skills are not up to this level of repair.Thanks to everyone who contributed their ideas, experience and knowledge!
