Question about 1995 Pontiac Firebird

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On a 1994 gmc 350 4x4 the vacuum cuming from the egr valve going to a little blak box has no vacuum to it but on the other side goint to the thottl body has vacuum to it

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  • Pontiac Master
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Does the box have an electrical connector? If it does, it would be a solenoid that is commanded by the computer to turn on and send the vacuum signal on from the intake to the egr valve. It would do so when the engine is at normal operating temperature and is accelerated from off idle to higher rpms. The EGR valve would not open at idle, so there would be no vacuum signal to it during idle. If you open the throttle up a bit (with the engine warm) the vacuum signal should be going to the EGR valve.

Posted on Feb 15, 2014

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1 Answer

1994 cherokee jeep


It is on the driver's side of engine, mounted onto the intake manifold-right in the middle of the manifold, but on the side. It has a removeable metal tube on it coming from the exhaust manifold.

With the egr valve, there may be an attached "egr valve vacuum transducer"-a little device only there to increase or decrease the vacuum signal to egr valve, based on the amount of back-pressure in the exhaust. The transducer valve has a vacuum hose from the engine, a hose from transducer to the egr valve, then another hose from bottom of transducer valve to monitor exhaust backpressure. Do not worry about the transducer valve when servicing the egr valve.

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Should a car run with the EGR valve removed?


I guess the answer depends on the purpose of the question.
Yes the engine can run without the EGR in place. If the EGR is removed and the engine started it should make a huge noise from the exhaust leaking. So you should not drive it with the valve removed.
The EGR valve redirects some of the exhaust gas back thru the intake to be reburned. That reduces emissions going out the tailpipe.

Jul 30, 2012 | 1994 Jeep Grand Cherokee

1 Answer

I have a 1995 gmc jimmy. Fuel injected 4.3 vortec. I need to clean out the egr valve but I have not been able to locate it. Can some one please help! If you have photos that would really help


Sorry I dont have a pic. for you. But here are instructions. The EGR valve is located at the top right of the engine next to the throttle body. REMOVAL & INSTALLATION
Except Linear EGR Valve

Disconnect the negative battery cable.
Remove the air cleaner assembly from the engine.
If equipped, unplug the valve electrical connection.
Remove the EGR valve vacuum tube from the valve.
Remove the EGR bolts and/or nuts and remove the EGR valve and gasket.
To install:
Install a new gasket to the EGR valve and install the EGR valve to the manifold.
Install the nuts and/or bolts. Tighten the bolts to 17 ft. lbs. (24 Nm) and the nuts to 15 ft. lbs. (20 Nm).
Connect the vacuum tube to the EGR valve.
If equipped, attach the valve electrical connection.
Install the air cleaner and connect the negative battery cable.
Linear EGR Valve
Disconnect the negative battery cable.
Note the position of the EGR valve prior to removal. Do not rotate the valve 180?.
Unplug the valve electrical connection..
Unfasten the valve retainers, then remove the valve and the gasket.

To install:
Clean all gasket residue from the gasket mating surfaces.
Install a new gasket and the valve.
Install the valve retainers.
On 1994-97 2.2L engines and 1994-95 4.3L engines, tighten the valve retainers to 17 ft. lbs. (24 Nm). On 1998-99 2.2L models, tighten the retainers to 19 ft. lbs. (26 Nm).
On 1996-99 4.3L models, tighten the retainers on the first pass to 89 inch lbs. (10 Nm) and on the final pass to 18 ft. lbs. (25 Nm).
Attach the valve electrical connections and connect the negative battery cable.

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1 Answer

94 toyota pickup 22re just replaced distributor plugs wires ignitor cleaned egr wasstopped up at little pipe on side vsv and mass constuntly pull vacum at idle could this be head gasket no water in oil no...


If your having idling problems from what i can tell of your post and the egr vsv (vacuum switching valve) has vacuum on both sides holding open the egr you need to check power at connector if ground and 12v present replace vsv

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1 Answer

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I have a 1998 gmc 4x4 that code 1404 has poped up and i would like to know what it means and what to do to fix it


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Ran diagnostics and got trouble codes 12 and 32. Was wondering if this is one problem or two separate problems, and what would they most likely be? My service engine light comes on occasionally and it...


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1 Answer

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1 Answer

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1 Answer

1994 Sonoma just threw a code 32 EGR Valve do you have a diagram of the motor or can you tell me where it is located?


Your EGR valve is located behind your throttle body and injectors, and it is attached to the intake manifold. It has two bolts on opposite sides of the valve and a vacuum line running out of it. Disconnect the vacuum line, remove the two bolts, and pull off the EGR valve. The EGR's on these trucks tend to get clogged up with carbon and stick. Take some carb and choke cleaner, and a small pick or very small flat head screw driver and break up the carbon inside of the valve. Be careful not to puncture the rubber diaphragm or you EGR will be no good after you get done cleaning it. Once you get all of the carbon deposits out of the EGR, assuming you buy a new gasket for it, put the gasket between the valve and intake manifold, tighten screws, and plug the vacuum line back in. This should solve your problem!

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