Re: 74 Cherokee Bucking/Cutting out Help Please

[Jerry Casper <gremlingts@xxxxxxxxx>]

--- Steven Clark <javelin1973401@xxxxxxxxx> wrote:

> Hello Everyone

> I got a deal on a 74 Cherokee last week...  The
problem with it is that
> when
> accelerating it starts to buck at about 3000 rpm?s,
> the engine cuts out then back in, bucks very badly
> unless you let off the accelerator.  It is worse
> when
> under a load, such as going up a hill.  It doesn?t
> cut
> out when parked.....The previous owner replaced the
fuel filter...



Steven, I had that EXACT same problem with my Toyota
truck recently, as it would only do 45-50 mph before
starting to buck, it was worse in colder weather, too.
I thought it was the catalytic converter, turned out
it was the fuel filter...so. Does your Jeep have a
catalytic converter? If so, how does your exhaust
pressure feel? If not, you could still be looking at a
fuel issue...could be a rubber hose is collapsing
under load. If you have enough room under the hood for
a small 2-gallon gas can, you could try running the
fuel pump hose directly to it, mount it under the
hood, and take it for a test-drive to eliminate the
fuel tank / hoses up to the fuel pump. If it still
does it, then it's gotta be either carb or fuel pump
or line further upstream. 
  If you DON'T have a cat in your exhaust, it could
also be, if it's the ORIGINAL exhaust, a problem with
the exhaust pipe. I had a '74 Chevy p/u with original
exhaust awhile back, it burnt a valve, had no
power...turned out the OEM exhaust pipe was
double-layered sheet metal, the inner one had rusted
thru, and the pressure got between the layers and
ballooned the metal partially closed, enough to
restrict the exhaust. I had to cut the y-pipe, and
feel the backpressure from both sides to find the
problem. Talk about weird! 
  Anyway, still sounds like yours is fuel, not
exhaust, but can't hurt to check either possibility.
Sounds like a nice truck, hope you can find the
problem quickly. 

Jerry in VA...


		
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