Pull the fusible link and replace. Did the trick for me. Even if that's not it, you'll be glad you did. $10 or less.Hey Y'all
Well, for 2 months "OSO" has been running better than at any time since we owned her. The major issue with stalling seemed to be resolved with the TPS replacement (after 4 months of replacing everything else), the new O2's relocated in the new custom '96/'93 cat-exhaust system resolved other drive-ability bugs and other than the EGR code (which I have given up on) all was wonderful. Guess no good thing lasts forever.
New symptom - Starts fine, idles high as usual for short time then once it drops off and would normally go into the 600 rpm idle it acts like it is confused. It will almost stall, then run up to 8-900 rpm then drop and almost stall. If you add driver input it will run and drive fine until you come to a stop or slow significantly then it will start the whole "chase the rpm needle" game and stall.
I have checked for bad/disconnected/open vacuum lines and found none. I pulled and cleaned the PCV valve with carb clean (also ordered a replacement) and this had no effect. It's not throwing any new CEL's so I have no direction indicated there.
My wife says she (the 'cruiser) is just jealous that I have started spending more attention on the '71 Lincoln and is acting out. Oh if that were just true
Any thoughts on what direction to take with this would be appreciated.
Thanks for the thought but been there, done that.Pull the fusible link and replace. Did the trick for me. Even if that's not it, you'll be glad you did. $10 or less.
New TPS in, no change. Everything is dead normal under driving conditions by locking in the hand throttle for idle at 650. Put it in park and it rises to just under 1K, which suggests to me the throttle electronics are functioning.I remembered that I have a hand throttle. Lock in about 400 additional RPM and it's driving perfectly.
New TPS goes in this week.
I don't know exactly what the ECU temp sensor has to do with the issues I had but is was the last thing, on the very long list of things, that I had found could have contributed to the idle/stalling problem. Since it is a separate sensor from the one that runs the temp gauge and just provides engine temp info to the ECU I assume it translates that info into determinations on air/fuel and idle speed.what does ECU Temp Sensor control? My 91 runs like it was designed to run. tore out all the smog crap, put in 4 port injectors and the torque is great and the fuel consumption is significantly improved. it is so smooth like it is a different engine entirely.
TPS is new and was set per FSM. IAC is new as well. I have chased this as a data issue, a vacuum issue, a fuel supply issue a fuel delivery issue, a sensor/monitor issue, an electrical issue, an exhaust issue.Check your throttle position sensor as per the FSM if these things get out of adjustment nothing works right
Indeed I have. I went through all the wiring while chasing the EGR code.have you checked the wires under the intake manifold, sometimes they get cooked
I know your frustrated as hell, but I would love to hear about a dealer experience. I was told by a very seasoned Toyota mechanic the new guys dont know anything about the older models let alone an 80. Heres what i did, but Im still holding out until I put a new MAF in.... I buy lots of stuff from the main Carquest hub close to me, and the guys have always been great. So I strolled in one day and asked them, in their opinion, who are the best non dealer Toyota mechanics in town that operate privately. Immediately he scribbled a note with a guys shop name and number. Maybe you have a similar resource? In the mean time I got my 90 Trooper running and plated and dear old Toyota is very sad sitting in a barn, all by her lonesome.Well it looks like I need to throw in the towel and take "OSO" to some new eyes.
The problem still is unresolved. She will run great for a couple weeks, falter suddenly for a day then get better for two and then just run like crap for several days then run great for a couple weeks again.
When all else fails seek professional help...I have been hesitant because there is no certainty that when I take her in it will be a period when she is acting up. Key that with finding a dealer that actually has people that really know these old rigs and not just OBD2 babies.
She was originally purchased at Camelback Toyota in '93 (still has the dealer sticker on her) Might have to see about taking her back to her roots,