1995 blazer 4.3 v6 vortec cpi hesitation problem
#1
1995 blazer 4.3 v6 vortec cpi hesitation problem
my blazer hesitates when going up a mountain or passing a car sometimes usually notice more on sharp steep mountain curves and you can hold the motor wide open and it fall on its face and the rpm slowly rise then all of a suddenly it wakes up at about 2500 rpm don't know what is causing it seems like a timing advance issue to me no check engine lights just replaced o2 sensors because thought that was it but it wasn't has new spark plugs wires and cap and rotor. seeing if anyone else had this issue with there 95 blazer sometimes it doesn't hesitate tho which is weird. thought about replacing crankshaft sensor and camshaft sensor to see if that helps.
#4
On paper the spec is like 56-60 or something. But, in my experience (and I've had some experiences with the fuel system on these trucks!) they will idle, and run at low load on less psi. There is no spec for fuel psi while the engine is running. But when my pumps were going bad, the truck would idle, and drive at very low throttle inputs. Once you gave it more than quarter throttle, or had to take off up a steep hill, it would fall on its face, misfire, sometimes stall out completely
#5
On paper the spec is like 56-60 or something. But, in my experience (and I've had some experiences with the fuel system on these trucks!) they will idle, and run at low load on less psi. There is no spec for fuel psi while the engine is running. But when my pumps were going bad, the truck would idle, and drive at very low throttle inputs. Once you gave it more than quarter throttle, or had to take off up a steep hill, it would fall on its face, misfire, sometimes stall out completely
Last edited by Matthew Anglin; 03-02-2019 at 11:49 PM.
#6
#7
Check your pressure at the test port, and test it at the fuel pump (either directly on the fuel pump output, or at the fuel filter fitting) and let us know the results.
Anything else will be throwing time and money at it, and hoping something sticks.
It might very well be timing or whatever you think it is, but your symptoms sound very similar to fuel pump issues I have had in the past.
Anything else will be throwing time and money at it, and hoping something sticks.
It might very well be timing or whatever you think it is, but your symptoms sound very similar to fuel pump issues I have had in the past.
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stephen5217
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02-17-2022 10:07 AM