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Unread 06-15-2013, 02:29 PM   #1
BeDifferent
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1995 ZJ 
 
Join Date: Nov 2012
Location: Powell, TN
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water pump causes poor acceleration

What would cause bog-down when accelerating up-hill?
add; grand-limited-5.2- was accelerating fine before leaving...

Driving to Kentucky from Knoxville, accelerate to pass is good on way there, then higher elevation and starts bogging down when trying to pass on those uphill ‘truck passing lane’ areas, = they are short and require a “foot down” to pass before the lane ends and two vehicles are side by side.

I was thinking it was due to elevation, maybe the computer was not compensating enough for thinner air -- but on the way back the condition became worse. Ease on to the throttle and we speed up with ‘ease’, but accelerate hard, even on level ground and it bogs, I checked the TV-cable, it is not broken or disconnected.
Next thing is when I got home and stopped, water began pouring out at the center/ uh water pump area. Next day verified that the water is leaking at the pump’s shaft out-to-pulley area.
?? Faulty water pump causes poor acceleration?? That makes no sense.

Things to do tomorrow,
check plugs for fouling.
Check throttle cable and TV cable travel.
Check plug wires … tuneup with new wires was done only 2 months ago, and this is not my daily driver.

I gladly listen to the voice of experience;

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Unread 06-15-2013, 03:36 PM   #2
jm8881
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How hot was it getting with that bad waterpump?
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Unread 06-15-2013, 04:02 PM   #3
Pierre_r
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So how long ago was it since you changed the fuel and airfilter?.
Because that is usualy what happends if one of those filters are clogged (exept the waterleak)
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Unread 06-15-2013, 04:39 PM   #4
BeDifferent
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right, thanks ..

fuel filter 5 months ago, air filter 1 month ago,
and the odd thing about the water pump, temps stayed at about 180 all the way home, just my luck that it only really poured out when I stopped in my driveway.

I was hoping to fix whatever with the engine while I have the tools out for the water pump.

full tuneup 5 months ago, and the 'ease on pedal = accelerate no problem' that leaves me unsure of were to look for the problems solution, / since my earliest opportunity to investigate further is tomorrow, I am gathering as many "where to look next" ideas as I can, possible some debris got to the cold intake and partial blocked there...
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Unread 06-23-2013, 06:54 PM   #5
BeDifferent
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AND While replacing the water pump, noticed the ?short return water hose? under the support brace looked puffed up, replaced that and the pump.
Then, it "just came to me" even though I had replace the fuel filter in December, I had planned to do that again about now. So replaced fuel filter.

I dont know what that sort hose is supposed to do, but I do know it is a serious project to replace.

The bogging down on acceleration is gone. -- the first time the fuel filter poured out some black "stuff" -- this time it looked clean, But engine runs fine now.

SO; bogging down = check obstructions, air filter, TPS, and fuel filter ....
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Unread 06-24-2013, 06:44 PM   #6
dusterdude
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Short hose is the bypass hose
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Unread 06-30-2013, 03:08 PM   #7
BeDifferent
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Still Bogging Down, battery is good, alt is good, new TPS, air filter new, TVcable is good,
--- see above, when I replaced the fuel filter, the problem seemed to go away -- but that was only momentary.

runs normal, revs normal, drives slow normal, but accelerate and it acts like it cant make up its mind to go or slow = rapid rev up and slow down -repeats as long as pressing accelerator,
let off and just ease on to the accelerator and it will run on down the street.

the cat is bad, the tailpipe is open between the cat and muffler, (parts on order) is that something that would cause the erratic acceleration?
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Unread 06-30-2013, 03:52 PM   #8
kachink
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If the cat is disintegrating inside it can partially block exhaust flow and cause those symptoms. The blockage is not complete, so it's only noticeable in high flow situations.
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