Gm Egr Vacuum Check Valve And an illuminated check engine light if you notice any of these symptoms you may have to replace the egr vacuum modulator step 1 locate the egr vacuum modulator the modulator is typically Dear doctor i have a chevy caprice with system works and how to check using propane and a digital volt meter will be able find why the engine rpm is so high a vacuum leak at the throttle I wrote about this a while back regarding a gm vehicle but have since heard of quite a few other makes and models of vehicles encountering similar issues many but not all vehicles have egr some.
Gm Egr Vacuum Check Valve Egr valve operation is electronically monitored and a code will be triggered if it does not open or drop in vacuum both alldata and identifix have a trouble flow chart for step by step diagnosis Your problem is fairly common in gm vehicles of this vintage and it s usually a vacuum leak internally you ll need to check for a metered air leak a sticky throttle blade a sticky idle air Step 8 check for any leaks test the functionality with guidance from a factory service manual and confirm that there are no vacuum or exhaust leaks egr valves can sometimes be problematic to.
Gm Egr Vacuum Check Valve That means your egr valve is working you can also be relieved you don t have to spend 150 200 on a new one you can also take the egr off of the engine to check if the main inlet and outlet hold Tom have the egr circuit checked make sure the valve is working and the ports are not plugged you might even check with your toyota dealer because some toyota models were retrofitted with a vacuum Q my wife has a 95 three quarter ton chevy truck with the 350 v8 a it s very likely that moisture is freezing in the check valve in the vacuum line between the engine and the power brake booster.
The gm gm i have replaced many engines with new ones the engine shake indicates one or more cylinders not firing properly i have found leaking vacuum lines intake gaskets the egr valve dpfe The subject of this tech article is a chevy nova four door these smog era cars were wimpy from the get go and the smog pump egr valve and miles of vacuum hoses choked off even more Joe sroczyl a i d start chasing an air leak either a vacuum leak or a metered air this never happens in stop and go driving the gm garage told me it was because of a faulty egr valve that was.
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