FJ60 idle help and PCV question (1 Viewer)
- Thread starter UZJ100LC
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cps432
SILVER Star
These trucks will run under many conditions even if it's unhealthy. They're pretty beasty like that. I've seen trucks "run" with vacuum leaks. I've had my truck running lean and rich for periods of time because of faulty emissions equipment. I've had vacuum lines routed incorrectly for years and still had my engine "working". It doesn't mean it was a healthy engine. If you're going to have the emissions equipment installed on your vehicle it's necessary to have it operating correctly or other issues can arise causing bad idle, rich or lean mix, or other issues that can be detrimental in the long run. After dealing with it for years and then removing all the smog equipment all together I can say that my engine runs better. Having no emissions control equipment is almost certainly better than having faulty equipment and having to re-rout vac lines to compensate. And it's true, that there are some ways to rout lines in a way that works, but it's not as toyota intended and it confuses the heck out of the next guy who goes to work on it, as we're seeing in this thread...
They are, but “totally “ is the correct word. How you have it hooked up now, the HAI system is inop (which isn’t really an issue in warm climates) along with the Hot Idle compensation and the distributor venting plumbing has been disabled
The distributor venting plumbing HAS to be fixed otherwise say goodbye to your distributor as it corrodes to death.
I was just working on those vacuum systems yesterday and can confirm you have it hooked up incorrectly. As @cps432 says, these engines can be adjusted to run pretty well even when things are not right. There are so many little adjustments that can compensate for or mask other issues. There are also entire vacuum systems that provide ancillary functions not directly related to how “well” the engine runs - like the distributor venting and HAI/HIC systems you’ve got plumbed incorrectly here.
No big deal though. A couple vacuum line changes and you’re in business. That white/black valve that clips to the underside of the air cleaner is likely bad - I figured out this week that almost all of those are bad at this age due to an internal diaphragm deteriorating. I made a quick fix while a new valve is on order and my idle vacuum went up by about 3inHg. The replacement is an 80 Series VCV by the way - use the search and find threads on “distributor venting”.
@FJ60LC I saw the thread title and came here to make sure you had Emissions manual. You didn’t disappoint. The more you live with that book and use it, the more you’ll start figuring all this out. A lot of times these trucks have an vac system issue and the carb is tuned around that, so don’t be discouraged if you rectify some of those vac systems and your truck runs like s***. Retune the carb, recheck other systems, etc. It’s a big puzzle that takes time.
@FJ60LC Regarding the EGR valve - the port that’s capped connects to the brown plastic EGR Modulator directly above it - you’ll see one port not connected on that. Disconnecting and capping both of those is a common fix when the EGR is not functioning well and causing running-rough issues. It’s ok to run with it that way, sort of.
The diaphragm on the carb can be capped off. The valve on the driver’s side wall can be left alone and disconnected. Looks like somebody removed or inop’d an AC system at some point. I’d look in the manuals for AC system diagrams and make sure everything else is capped off or dealt with too.
Back of the emissions FSM has instructions on adjusting the carb using the “lean drop” method. I pull the air cleaner off for easier adjustment of the idle mixture screw … and if you’re that far you may as well pull the valve cover and set the valves.
The diaphragm on the carb can be capped off. The valve on the driver’s side wall can be left alone and disconnected. Looks like somebody removed or inop’d an AC system at some point. I’d look in the manuals for AC system diagrams and make sure everything else is capped off or dealt with too.
Back of the emissions FSM has instructions on adjusting the carb using the “lean drop” method. I pull the air cleaner off for easier adjustment of the idle mixture screw … and if you’re that far you may as well pull the valve cover and set the valves.
OSS knows what he's talking about. Don't take net forum talk personally, he's only trying to help because the below quote is absolutely true and will happen quickly. Sometimes the dissy caps blows up too, from gas fumes. It's a PITA but study and follow the emissions FSM.
Sorry to OP on bad pictures, and hijacking thread. Thanks to everyone for the help. I have moved to a new thread.
- Thread starter
- #29
Thanks for the tips. I have one quick question maybe you or @OSS can help me with. I’ve been digging through some threads and it seems like a malfunctioning egr can mess up the distributor. If we are assuming mine is broken since it is capped should I get a new egr set up or recurve the distributor?
Again I’m not in a county where I need to pass smog.
I can
I can’t think of a way that the EGR would directly affect the dizzy. Indirectly though … the EGR changes the combustion mixture, and perhaps there’s an issue of timing versus mixture.
Links to posts?
@OSS knows a LOT more than I do about these trucks so I’ll defer to him (and others).
I can’t think of a way that the EGR would directly affect the dizzy. Indirectly though … the EGR changes the combustion mixture, and perhaps there’s an issue of timing versus mixture.
Links to posts?
- Thread starter
- #32
What needs to be adjusted when disabling EGR valve?
From reading various threads it seems as if one was to cap off the vacuum line between the EGR valve and modulator that recurving the distributor would be needed. My 1985 runs like a new truck when I disable the EGR valve. Im thinking of running it disabled between smog appointments. I'm in the...
forum.ih8mud.com
Also post #2 by OSS here:
1983 Desmog FJ60
Ok, I know there are a ton of threads on this subject and I have read them all. I am planning on doing a desmog on my 1983 FJ60. Looking for comments and resources specifically related to doing the desmog on an early model 60 with a 2F engine. Any gotchas, "oops I did this wrong when I did...
forum.ih8mud.com
The distributor’s timing is curved for use with EGR. The mechanical timing in the distributor is more advanced to account for the slower burning charge of EGR gas.
When the EGR valve is disabled, more oxygen gets mixed into the air/fuel mixture, which burns faster (and hotter) so the distributor timing needs to be retarded.
Adjusting the distributor timing for non EGR use requires it to be “recurved” using different springs inside. If it’s not recurved with a disabled EGR, it’ll ping at certain RPMs & loads.
A screwed up EGR valve can’t hurt a distributor.
When the EGR valve is disabled, more oxygen gets mixed into the air/fuel mixture, which burns faster (and hotter) so the distributor timing needs to be retarded.
Adjusting the distributor timing for non EGR use requires it to be “recurved” using different springs inside. If it’s not recurved with a disabled EGR, it’ll ping at certain RPMs & loads.
A screwed up EGR valve can’t hurt a distributor.
cps432
SILVER Star
Matt, I think you installed the locking hub incorrectly.
how dare you think that's how i roll ?
i only use WHITE GLOVES approach & White HOTEL grade Terry Towel fender covers ..........
