You will need to remove the exhaust manifold retaining bolts in your 1993 Chevy Astro. Remove the exhaust manifold. Remove the exhaust manifold gasket and clean the surface. Reverse the process to install the new exhaust manifold gasket.
I know that one of them is located on the exhaust manifold, between the point where the left and right exhaust manifolds merge and the catalytic converter. But I am not sure if there is a second one.
It snaps in. But before you snap it out, take the nut out that holds the pipe to the exhaust manifold.
The upstream o/2 sensor is located in the exhaust system between the exhaust manifold and the catalytic converter. Some vehicles will have 2 upstream sensors (i.e. 1999 Chevy astro 4.3l engine has sensor for left exhaust manifold and another for right exhaust manifold). I am trying to find out for sure if you have to replace both when one goes bad. Bosch says both must be replaced!!!??? Oh yeah it(they)are easy enough to replace if you can see it (them).
Remove the intake manifold retaining bolts from your 1996 Chevy Astro Van. Remove the manifold gasket and clean the surface. Reverse the process to install the new intake manifold gasket.
The 1999 has three O2 sensors. One in each of the exhaust pipes coming off of the manifold and a third after the catalytic converter. Not sure if the 96 is the same or not.
The 4.3 liter Chevy Astro head gasket torque specification is 160 pounds. The head gasket bolts should be torqued in 40 pound intervals.
190 hp and 250 Ibs of torque
If the 8th digit on your vin number is an X as mine is there are 3 oxygen sensors. I don't have dual exhaust so I have one o2 sensor below each manifold (visible from underneath the van) and one after the catalytic converter.
it is part of the fuel injector which is under the upper intake manifold
right side(passanger side) of engine under the exhaust manafold.
Astro and Safari 100 ft. lbs.
Check pass. side middle of manifold cover. runs about 10$
Most all of the vacuum lines will start from the intake manifold in the rear..........
I think it's your EGR Valve. The EGR valve, or Exhaust Gas Recirculation valve, is a vacuum controlled valve which allows a specific amount of your exhaust back into the intake manifold.The EGR valve, or Exhaust Gas Recirculation valve, is a vacuum controlled valve which allows a specific amount of your exhaust back into the intake manifold. You'll know if your EGR valve is stuck or malfunctioning because your car will experience symptoms like rough idle and bucking on acceleration.
The vents are controlled by vaccuum from the intake manifold. Check for a split rubber vac. hose on the manifold- Hope that helps.
It is inside the upper intake manifold. It is attached to the fuel injector poppets with a bracket. To inspect/replace you must remove the upper intake manifold.
If your exhaust pipes by engine get red hot you have a vacuum leak that will make it sluggish
They are located in the exhaust system, rearward of the manifolds, and again after the catalytic converter.
1995 Chevrolet Astro, 4.3 V6 engine with Single Point Injection System has one O2 sensor located in exhaust pipe (between catalitic converter and the place where exhaust pipes from right and left cylinder heads meets in one pipe).
It's part of the fuel injection assembly inside the upper manifold.
That would probably cause it to run lean.
To the left of the water inlet housing (thermostat housing) on the intake manifold
vacume line to the valve has broke off from manifold vac that goes to the switch
check evaporative charcoal canister and its componants for fuel.replace oxygen sensor,