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Discussion Starter #1
O.K, noticed this about 2 weeks ago. When my truck is cold and running when I push the brakes the idle does not surge. But, when my truck is fully warmed up it does not do it either. But, when my truck is partially warmed and the brake is pressed the idle will start to surge 500 rpm (of course while in N or when the clutch is pushed in) I heard my idle could be too far up? (Idles at 1100) and something about my coolant becoming a certain temp and the sensor on the bottom of the butterfly assembly read the warmth of the coolant and then changes the idle...is it that thing?

Thanks
 

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rock crawler
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12,801 Posts
Yes, it's usually because the idle is set too high, and 1100 is too high.
The ECM knows you stepped on the brake, sees the idle is high, so it cuts the fuel to help you slow down.
 

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Procrastinating on TN
'93 Pickup
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Ya, my truck does the exact same thing, and it seems this is a fairly common problem. I've seen loads of other threads on other forums about this. Could just be the idle set too high, could be a vacuum leak somewhere, haven't managed to fix mine yet. but i would say just try adjusting the idle before you try anything more complicated. Although the manual says the idle for my truck should be 850 that seems so low and rough, feels much more comfortable at 1100-1200, but maybe it would solve the idle bouncing, i don't know.
 

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Discussion Starter #4
I turned it down...and now it doesn't do it. Thanks!
 

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rock crawler
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Procrastinating on TN
'93 Pickup
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Ya I turned my idle down to 850 like the spec says and it seemed to solve my problem. Still felt too rough for comfort idiling that low, turned it up to right on 1000 when fully hot, and I still have had no problems with the surging, feels much more comfortable. My idle used to sit at like 1500 when hot, so I'm sure that was the problem. I sugest marking the idle screw/housing it sits in in order to make sure it doesn't move on you. It's funny, it's like I really enjoy driving my truck just because the surging would bug me so much. I don't know if it has serious repercutions if you don't fix it, other than it not being the greatest for your gas milage. But still, feels much better. Since this seems to be such a common problem, reccomend that everyone try adjusting the idle first. :D
 

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Discussion Starter #7
lol yeah. Mines at 750 and it feels like my old 2.9l v6 in my Ford Ranger...that thing had good compression but it felt like it was going to fall apart...but I could not adjust the idle on that truck.

I think I am going to turn up my idle. Having 40psi in #3 cylinder is not good for idling...lol
 
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