My 88 fj62, 3fe, fuel injected is idling a little high @1150 rpms. Might not bother me too much, but with the price of gas....well you all know. Any fixes?? For the idle problem that is.
Needing help with High Idle
- Thread starter notatreehugger
- Start date
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cabron said:
be sure you are using flamable carb cleaner. not the non flamable (newer) stuff is sometimes non flamable.
you want to listen for an increase in RPM. if you hear one, that is where your leak is.
also, is this new? or has it always been high? you will want to check your TPS per the FSM. get that within spec and see if it is still idling high.
-pp
you could also use a propane torch to look for leaks. it's easier to point the nozzle into specific places and will last longer. just don't light it! good luck - TSH
I finally figured it out.
Hi-
I have had the EXACT problem for months and I finally found the problem yesterday. If you do not find any vac leaks, then check the machanical stuff like your throttle cables, dash pot and stop screw, if they are adjusted properly, then do a throttlebody service ie. remove and clean TB and check your idle speed control valve while you are at it. While your throttle body is off, adjust your Throttle Position Sensor as per FSM, that last step is what finally got me down to proper idle speed.
If you just want to adjust your TPS without taking off your TB then just loosen the top screw and tweak the TPS COUNTER clockwise, not clockwise (as the FSM says.) If you do this with the engine running you will hear the idle speed increase and decrease with how much you tweak the TPS either direction. It is VERY sensitive so be careful. You will only need to adjust it less than .5 mm counter clockwise. If the TPS does not budge with a little hand pressure with the top screw loosened then you will have to take off your TB. The TPS is plastic so do this with care.
i hope this helps! good luck.
Hi-
I have had the EXACT problem for months and I finally found the problem yesterday. If you do not find any vac leaks, then check the machanical stuff like your throttle cables, dash pot and stop screw, if they are adjusted properly, then do a throttlebody service ie. remove and clean TB and check your idle speed control valve while you are at it. While your throttle body is off, adjust your Throttle Position Sensor as per FSM, that last step is what finally got me down to proper idle speed.
If you just want to adjust your TPS without taking off your TB then just loosen the top screw and tweak the TPS COUNTER clockwise, not clockwise (as the FSM says.) If you do this with the engine running you will hear the idle speed increase and decrease with how much you tweak the TPS either direction. It is VERY sensitive so be careful. You will only need to adjust it less than .5 mm counter clockwise. If the TPS does not budge with a little hand pressure with the top screw loosened then you will have to take off your TB. The TPS is plastic so do this with care.
i hope this helps! good luck.
tracksuit hobo said:
Could you please explain more detail about using way of propane torch when I want to find leak point ?
I'm very interested in your post but I can't understand
Thank you,
Oh, Min Seok
bigbertha said:
if you can get it to move, do it while the truck is running, you will hear the RPM change as you twist it.
also, if it wont budge, you dont have to take off the TB. remove the hose that keeps you from getting to the bottom screw, loosen it, twist it counter clock... then put back on, fire her up. see where you are. wash, rinse, repeat as needed.
schaats said:Could you please explain more detail about using way of propane torch when I want to find leak point ?
I'm very interested in your post but I can't understand
Thank you,
Oh, Min Seok
what you do is turn the valve (on the propane bottle attachement) to let the gas out, then point the nozzle at specific lines or valves (or even intake manifold), - if there is a leak, the uningnited propane will be sucked into the motor via the leak, and you will notice a change in the idle RPM.
By holding the body of the propane bottle, the nozzle can be pointed into tight spots easier and the flow of gas will be constant.....rather than having to hold your finger on the spraycan to keep the carb cleaner spraying.
it works well, without spraying carb cleaner everywhere. The fumes from carb cleaner can get nasty if sprayed on hot surfaces. and since we're using flammable materials, if a fire occurs, the propane fire will be shorter lived.....
i found 2 leaks this way, through cracked lines.
here's what the torch looks like
http://bernzomatic.com/bernzomatic/consumer/jhtml/detail.jhtml?prodId=BernzoProd100026
http://bernzomatic.com/bernzomatic/consumer/jhtml/detail.jhtml?prodId=BernzoProd100026
tracksuit hobo said:
Thanks a lot !
A defective water temp sensor will cause a high idle condition also. The sensor in my FJ62 went bad causing the ECM to think the engine was cold all the time, hence the high idle. It's not an expensive part, but a real bitvh to get to.
Don
Don