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Intermittent Stalling/Dying While Otherwise Driving Fine...Restarts, Drives, Randomly Dies Again.


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1 hour ago, 89 MJ said:

How do all of your connectors for various sensors look? Any chance you’re losing connection somewhere?

They all look connected and I don't see any that look damaged.  But maybe I'll disconnect and reconnect them just to see if anything changes.  Back when Radio Shack existed they sold a contact cleaner spray that worked wonders on TV and CB tuners, wish I had a can of that stuff to clean the connections as well.

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Contact cleaner is still readily available at most hardware stores and should be used on any connector that doesn’t look new inside. 
 

also, did you verify that all those bolts on the bottom of the exhaust manifold are tight? Or just that they exist?

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50 minutes ago, AnotherOldJeepGuy said:

They all look connected and I don't see any that look damaged.  But maybe I'll disconnect and reconnect them just to see if anything changes.  Back when Radio Shack existed they sold a contact cleaner spray that worked wonders on TV and CB tuners, wish I had a can of that stuff to clean the connections as well.

I have my doubts it will fix it, but we can hope so!

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4 hours ago, GonzoTheGreat said:

Contact cleaner is still readily available at most hardware stores and should be used on any connector that doesn’t look new inside. 
 

also, did you verify that all those bolts on the bottom of the exhaust manifold are tight? Or just that they exist?

I was able to visually verify they exist and don't look loose.  Trying to get to them is still on the list but so far I have not been able to get to them with a wrench.. can't see them from the top to aim the wrench, and so far I can't reach them from underneath!

 

So since for the other areas the water test was very effective in locating leaks on that end, and also in showing afterwards that tightening closed the leaks at those points, I am for the moment assuming that since the water test from below doesn't show any leaks (ie rpm does not change when sprayed), they are no leaks there.  I know that is not the same as being 100% sure with a wrench, but it seems to be good evidence that they are not leaking based on how well it worked in other locations.  Does that seem logical? 

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On 2/17/2025 at 6:42 PM, AnotherOldJeepGuy said:

They all look connected and I don't see any that look damaged.  But maybe I'll disconnect and reconnect them just to see if anything changes.  Back when Radio Shack existed they sold a contact cleaner spray that worked wonders on TV and CB tuners, wish I had a can of that stuff to clean the connections as well.

I think the product you are looking for is named DeoxIT.  There are a couple of different varieties so you may want to do a bit of research.

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I managed to contort myself enough to get to the last 4 bolts on the underside of my manifold, none were loose.  Kinda makes sense since the water test from underneath didn't indicate any gap.  So good news bad news.  My bolts are tight, my truck still stalls :(.  I am about ready to glue a dime on the throttle at the throttle body stop, so it can't get to the bottom, since that's where it stalls!  A bit like how I "fixed" my pass window so that it could not be fully lowered to the point it would not roll back up, with a 2x4 in the door limiting how far down it would go....

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1 hour ago, AnotherOldJeepGuy said:

I am about ready to glue a dime on the throttle at the throttle body stop, so it can't get to the bottom, since that's where it stalls!

It may be that your IAC (idle air control) valve is stuck fully extended. Have you removed and cleaned it? Cruiser did a good write up on how to.

 

 

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I have now messed with the IAC and the verdict is....

 

Stall-NoStall.JPG.3c146869d8b1cab61209147fb9d6c8b8.JPG

 

I also cleaned what I could without removing the TB.  When I do the next tuneup I'll probably remove and clean that too.

 

Thanks to all for the assists over the last couple months or so stepping through this (so far)!

Edited by AnotherOldJeepGuy
typo, later added "so far" when failure came back :(
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I originally tagged on to this post by BlueDove91, "Intermittent Stalling/Dying While Otherwise Driving Fine...Restarts, Drives, Randomly Dies Again" because of similarity.  This was 1/6/25.  I had no expectation how long my "tag on" would last!  Over time I think my issue has diverged enough that, in hindsight, it should have probably been it's own thread.  Too late to start this issue 1/6/25, but I think I should re-title, summarize, and move forward with a more appropriate title.  So I will with this post, and with the new title "Stalls At Rapid RPM Decrease, Foot-Off Accelerator, Otherwise Runs Fine".  Please follow the saga from that link going forward....

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