Renix Dead Spot And Idiling Low

[cruiser54]

Tap it in carefully at the edge to kinda flip it. 

[1989 Eliminator]

Okay I was worried that if I destroyed this plug that it would be a hole in the throttle body! :cry:  Because I destroyed the plug..... Okay now I see the bleed screw.

[cruiser54]

You can put the tissues away now. LOL. I should have been more clear. 

 

Got it bolted back on yet? 

[1989 Eliminator]

Yes and I just went ahead and played with it a bit. It was screwed in all the way clockwise. So I turned it back a bit until the rpms seemed okay. Then I test drove it and the idle is defiantly higher where it is supposed to be. Still fluctuating a bit like before though.

[cruiser54]

Doesn't take much. Shouldn't be fluctuating though. I'm thinking something else isn't right. 

 

 I'm gonna have to bail here in a bit. 

 

Was your distributor off at all when you checked it for indexing?

[1989 Eliminator]

Yeah thats cool thanks for staying so I could figure out this screw. Yeah I indexed it awhile ago. I do have to replace my accelerator cable since the bracket broke on the cable. Wouldnt think it would have an effect on the fluctuating but ill replace it.

[cruiser54]

I wouldn't think the accelerator cable would be an issue either. I edited my post about indexing. Was it off and needing correcting? 

[1989 Eliminator]

Yeah it was off a few degrees. So it helped I'm sure. 

[1989 Eliminator]

For those following this thread here is the "plug" that covers the air bleed screw. I destroyed it.... But its just a thin circle piece of metal.



Here is the location of the air bleed screw.

[Jeep Driver]

Take your oil fill cap off while it is running and see if there is any air being forced out of the crankcase.

[1989 Eliminator]

Nothing noticeable or extreme. Just some air movement due to the rockers moving. 

 

I have also noticed that right after a fill up, the truck revs up good after the first start up, and then settles down to a good idle. But after awhile of driving it goes back to fluctuating at idle. And yes I have replaced my gas cap. I don't know if right after filling up would cause anything to run better for some reason. 

[cruiser54]

I know the oxygen sensor is new, but is it working? Not just the heater portion but the switching part inside. 

[1989 Eliminator]

I tested for ground, the 12 v heater and the 5 v signal. But i do not have an analog meter to test the switching

[cruiser54]

This is a stone I don't think we should leave unturned at this point. 

 

Why not use a digital meter? If it's not switching, you'll see that.

[1989 Eliminator]

Well the instructions say use an analog... But I did use a digital anyways just to see the readings and they were switching from 1-4 volts constantly.

[cruiser54]

You're good there. 

[1989 Eliminator]

Well after a long drive today, I noticed the how the truck idles can vary. Sometimes at a stop the truck will idle pretty good and other times the rpms will jump around a bit and can feel a rough idle. The rough idle is not terrible like it is going to stale but defiantly noticeable.

[cruiser54]

Got any mechanic friends with a Snap-On MT2500 scan tool aka "The Brick"?

[1989 Eliminator]

Eh yeah high school auto shop haha doesnt that just tell you basically suggestions of what you should do? Like if this is happening do this...

[cruiser54]

I believe it reads real time sensor operation like my factory scan tool. 

[1989 Eliminator]

Hm i didnt know the "renix scam tool" did that. Ill get my hands on one

[cruiser54]

There was and adapter to use the Chrysler DRB on the Renix Jeeps. I have one.

 

The MT2500 "brick" can scan it also with the correct adapters. 

 

No stored codes or anything, but reading stuff in "real time" has worked for me. 

[1989 Eliminator]

Still havent been able to find a snap-on scanner but I have played with the air bleed screw some more and she seems to be running really good now! No more low idle and the idle is clean without jumping around. :rotfl2:

 

Thanks for all the help! I have done about everything to fix a rough idle and I hope this becomes a good reference for how to fix your idle in the future. It is a very long thread though! :thumbsup:

[TheDude]

Still havent been able to find a snap-on scanner but I have played with the air bleed screw some more and she seems to be running really good now! No more low idle and the idle is clean without jumping around. :rotfl2:

 

Thanks for all the help! I have done about everything to fix a rough idle and I hope this becomes a good reference for how to fix your idle in the future. It is a very long thread though! :thumbsup:

Now that you've got yours sorted out, maybe I'll swing by and you can give me hand with mine! lol 

[cruiser54]

 

Still havent been able to find a snap-on scanner but I have played with the air bleed screw some more and she seems to be running really good now! No more low idle and the idle is clean without jumping around. :rotfl2:

 

Thanks for all the help! I have done about everything to fix a rough idle and I hope this becomes a good reference for how to fix your idle in the future. It is a very long thread though! :thumbsup:

Now that you've got yours sorted out, maybe I'll swing by and you can give me hand with mine! lol 

 

And messing with that screw is certainly not a starting point.....