ok...so this is a strange one that I have been working on for a while now. Gonna throw the background in here because it is either something I touched, or a great coincidence.
first: '91 FJ80 ~297k
~3 months ago I had overheating issues. Ended up replacing the thermostat and while doing that found that multiple electric sensors in the thermo housing were brittle and cracked/disintegrated upon removal. 2 of them are no longer made by toyota and could not find any after market, so ended up buying used ones on the interwebs. Got all things put back together and did not have any overheating issues anymore.
After taking it out for a few local test drives I found that I had some vacuum leaks as well. So replaced all vacuum lines since most of them were super dry and cracking.
New issue suddenly appeared after those first few drives...when I initially start the truck after sitting overnight, it runs fine...no issues. Once I get to operating temp, then shut the truck off and let sit for a few minutes (like long enough to get gas) and then start it again, I have a rough idle and loss of power. This only happens if I shut the truck off and then turn it on again while at operating temp. If I start the truck in the morning...and drive/run it all day (tested this over a weekend) it will run fine.
I took it in to have it diagnosed today and the mechanic told me that it needs a valve adjustment...while I do not disagree with that, I think that there is more than that going on with some sensor or something. I have no idea how to test or where to go from here. I have done some searches and have seen things about vacuum (replaced all of them) and EGR valve (they dont make those anymore, and I have NOT tried to clean mine yet) It just really feel like it is something computer related due to when the issue presents itself...or it is super coincidental and the work I did has nothing to do with it.
Also it is throwing codes, 25 and 26...rich and lean. So I did replace the O2 sensors with brand new OEM and new gaskets (but the nuts were really worn, maybe bad seal on them?)
any help is appreciated...I need to get back out.
first: '91 FJ80 ~297k
~3 months ago I had overheating issues. Ended up replacing the thermostat and while doing that found that multiple electric sensors in the thermo housing were brittle and cracked/disintegrated upon removal. 2 of them are no longer made by toyota and could not find any after market, so ended up buying used ones on the interwebs. Got all things put back together and did not have any overheating issues anymore.
After taking it out for a few local test drives I found that I had some vacuum leaks as well. So replaced all vacuum lines since most of them were super dry and cracking.
New issue suddenly appeared after those first few drives...when I initially start the truck after sitting overnight, it runs fine...no issues. Once I get to operating temp, then shut the truck off and let sit for a few minutes (like long enough to get gas) and then start it again, I have a rough idle and loss of power. This only happens if I shut the truck off and then turn it on again while at operating temp. If I start the truck in the morning...and drive/run it all day (tested this over a weekend) it will run fine.
I took it in to have it diagnosed today and the mechanic told me that it needs a valve adjustment...while I do not disagree with that, I think that there is more than that going on with some sensor or something. I have no idea how to test or where to go from here. I have done some searches and have seen things about vacuum (replaced all of them) and EGR valve (they dont make those anymore, and I have NOT tried to clean mine yet) It just really feel like it is something computer related due to when the issue presents itself...or it is super coincidental and the work I did has nothing to do with it.
Also it is throwing codes, 25 and 26...rich and lean. So I did replace the O2 sensors with brand new OEM and new gaskets (but the nuts were really worn, maybe bad seal on them?)
any help is appreciated...I need to get back out.