- Thread starter
- #21
1911 said:
Hummm, you think 3 computers would be bad?? Also, I'm not having any trouble with the ICS but the air injection system.
Emissions Help Needed! (1 Viewer)
- Thread starter AdamKFarmer
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Hummm, you think 3 computers would be bad?? Also, I'm not having any trouble with the ICS but the air injection system.
The "Computers" are known to fail. New ones are NLA from Toyota so that's all there is. And you're correct that the computer controls circuits through grounding.
Did you ever take the ABV (the entire mechanical valve) apart and clean it? As stated, they frequently are full of grenaded smog parts and bits of old rubber hose that can block or partially block the passages.
Per your smog test, what was the percent of residual O2 ?
Also, the pressure relief valve can have s*** in it, too.
https://forum.ih8mud.com/60-series-wagons/469140-failed-california-smog-suggestions.html
Did you ever take the ABV (the entire mechanical valve) apart and clean it? As stated, they frequently are full of grenaded smog parts and bits of old rubber hose that can block or partially block the passages.
Per your smog test, what was the percent of residual O2 ?
Also, the pressure relief valve can have s*** in it, too.
https://forum.ih8mud.com/60-series-wagons/469140-failed-california-smog-suggestions.html
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- Thread starter
- #23
Spike Strip said:
I haven't taken it apart, but it seems to work fairly well, when I bypass vsv 2 it opens the valve and takes it out of bypass. I was trying to determine what the voltage should read to the plugs that connect to the VSV. I think the computer or the wiring is at fault. I've attached my emissions report.
I don't see residual O2 % like the CA tests, but they say AI passed, so you must have some minimum percent which means your AI is working.
Your truck seems to be running fairly clean, so everything must be working, more or less...
If you suspect the Emissions computer, rather than trying to hunt down a good one, do as stated above and just re-solder the connector pins. That's the issue with those stupid things.
These pre-OBD smog systems are absolutely s***.
btw, I went through every freakin' component on mine and it all spec'd and worked according to the Emissions Manual, but I could never get the AI (residual O2) to move past zero percent. I even replaced the two check valves with ne OE... I eventually passed smog, but barely. I gave up after that for 2 years.
Your truck seems to be running fairly clean, so everything must be working, more or less...
If you suspect the Emissions computer, rather than trying to hunt down a good one, do as stated above and just re-solder the connector pins. That's the issue with those stupid things.
These pre-OBD smog systems are absolutely s***.
btw, I went through every freakin' component on mine and it all spec'd and worked according to the Emissions Manual, but I could never get the AI (residual O2) to move past zero percent. I even replaced the two check valves with ne OE... I eventually passed smog, but barely. I gave up after that for 2 years.
- Thread starter
- #25
Spike Strip said:I don't see residual O2 % like the CA tests, but they say AI passed, so you must have some minimum percent which means your AI is working.
Your truck seems to be running fairly clean, so everything must be working, more or less...
If you suspect the Emissions computer, rather than trying to hunt down a good one, do as stated above and just re-solder the connector pins. That's the issue with those stupid things.
These pre-OBD smog systems are absolutely s***.
btw, I went through every freakin' component on mine and it all spec'd and worked according to the Emissions Manual, but I could never get the AI (residual O2) to move past zero percent. I even replaced the two check valves with ne OE... I eventually passed smog, but barely. I gave up after that for 2 years.
I'm pretty sure that AI pass is just a visual inspection. Yeah, I passed pretty easily and the truck runs clean!
Well, I'll give the emissions computer a shot, I've given it a pretty through inspection before. I did put in a computer from another 82 40 that wasn't stuck in bypass and mine still wouldn't switch out. When your residual wouldn't move was the AI injecting properly??
It seemed to be, according to the tests in the manual. Smog pump was a fresh rebuild, and was blowing, though at the time I didn't have the SST to check its output. Replaced the two check valves into the injection manifold and down-pipe. Next time around I'm going to double check the speed sensor (there's a crude one in the speedo cluster) and thermo-sensor. Every thing else looked good...
I've since acquired a NOS ABV valve assy that I'll probably install for the next round of tests, come Sept.
I've since acquired a NOS ABV valve assy that I'll probably install for the next round of tests, come Sept.
- Thread starter
- #27
Spike Strip said:
It sounds like your equipment seems okay. I'm not sure if your residual O2 would move much if it was injecting properly or not. I'd pull off the bypass and air rail hose to determine where the air is going before replacing the ABV. I tried to check the speed sensor on the cluster but wasn't sure exactly what to look for.
- Thread starter
- #29
Spike Strip said:
Nice! I know what I'm checking next!
- Thread starter
- #30
Spike, another question for you, does your carb cooling fan work? Also, does the box itself need to be grounded through the bracket? I'm kind of in a quandary, I just opened up my computer and it looks brand new. I'm trying to figure out why when I switched in a known working computer it doesn't want to work with my system.
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My carb fan works, but I have the white wire from the ICS grounded to a screw on the carb. That by-passes the computer for the ICS. As as far as the Emissions box grounded at the bracket, I don't know. Haven't looked at a wiring diagram in a long time, but I kind of remember the body ground for the computer is one of the terminals. I think there's a wiring diagram in the FSM. If you don't have a 60-series FSM you can download a PDF copy from my sig line.
You might of covered this already but he first things that come to mind to try are:
Pull off the vacuum hose going to the ASV & ABV and use a hand pump to check the vacuum.
Check the vacuum supply to the both.
Pull off the hose going back to the air cleaner. You should feel the air if it is in bypass mode. Now apply vacuum to the ABV directly with a hand pump or line directly off the manifold and see if you can get the bypass air to stop.
Completely rule out the ASV, ABV, and VSV.
I agree with others if you haven't taken apart the ABV and make sure there are not bits from a smog pump stuck inside it if it test bad.
Pull off the vacuum hose going to the ASV & ABV and use a hand pump to check the vacuum.
Check the vacuum supply to the both.
Pull off the hose going back to the air cleaner. You should feel the air if it is in bypass mode. Now apply vacuum to the ABV directly with a hand pump or line directly off the manifold and see if you can get the bypass air to stop.
Completely rule out the ASV, ABV, and VSV.
I agree with others if you haven't taken apart the ABV and make sure there are not bits from a smog pump stuck inside it if it test bad.
Ok I just saw your message so most of my post does not apply.
If you tried multiple boards, the pins in connector to the board could still be pushed back and not making contact. Pull the board and take off the enclosure and then measure continuity from the back of each pin in the connector to the back of the associated pin behind the plug on the board.
- Thread starter
- #35
So, I re-soldered the pins on the board and checked continuity. All looks good there, with the plug in I had good continuity between the back of each connection and the board, I even checked it with the ground and they all had continuity there except pin 4 from the IG coil, which may be normal, I'm not sure. I checked both of the VSVs again and I'm getting 12V at the plug when I ground it to the chassis. I've checked continuity on the plugs to the computer and that checks out as well. I think my ABV might be busted, I checked and both of the VSVs were closed and in bypass but when I removed the vac hose from the ABV to the VSV it injects to the exhaust which isn't correct either. Before I rip into that though, I want the 12V at the plug! Are all the grounds required to get this thing to work correctly? All of them check out except the speed sensor which I haven't looked into yet.
- Thread starter
- #36
Ok, well a small update. I checked all three VSVs the two for the AI and the 1 for the EGR, none of them have 12V, I checked them and VSV 1, which should always be open except when the CAT is hot also doesn't have 12V, only has 1 or 2. Maybe it's the computer again? I dunno... Not looking good.
akingf5371,
How much do you value your time? I think this problem is over the head of the other members here. If you have the money, just take it into a qualified shop and more then likely get the truck back in a day or two. BTW, did not see the pass/fail on the co2 but, if everything else is passing, you have a lean operating condition if it exceeds the co2 limits.
Emissions repairs are to be repaired by shops that have five gas analyzers.
How much do you value your time? I think this problem is over the head of the other members here. If you have the money, just take it into a qualified shop and more then likely get the truck back in a day or two. BTW, did not see the pass/fail on the co2 but, if everything else is passing, you have a lean operating condition if it exceeds the co2 limits.
Emissions repairs are to be repaired by shops that have five gas analyzers.
- Thread starter
- #38
Rusty-
Yeah, I hear you. I'm a man with little time on his hands, and the further I go down this rabbit hole the more I want to pass this off to someone with more time and resources. Going to drop it off on Thursday to see what they can find.
Yeah, I hear you. I'm a man with little time on his hands, and the further I go down this rabbit hole the more I want to pass this off to someone with more time and resources. Going to drop it off on Thursday to see what they can find.
djawahir
SILVER Star
Where are you taking it? I helped a buddy of mine go through his emissions on his FJ60 and it wasn't that bad. I've got an emissions manual and can spare a couple hours helping you figure it out. I'm in Serra Mesa part of San Diego if you want to hook up.
- Thread starter
- #40
djawahir-
I'm taking it to a Land Cruiser specialist here in Denver, I've used them for a few things I couldn't do on my own in the past. I've gone through it myself and even compared it side by side with another 82 FJ40. I do appreciate the offer though! I think the problem is beyond my abilities and supplies!
