Question about 1991 Nissan 300ZX

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Egr trouble code 35 keeps turning light on

I made sure wireing and vacum diagram is rite even used a vacum gauge on egr to see if it worked properly also tested for vacum when held at 2000 rpm and that was good what mite cause the light to come on

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It could simply be that the EGR valve is clogged. You could try doing a Seafoam treatment on the vacuum system to see if that can free up the EGR (you can get the Seafoam at AutoZone or any other parts store, and it's cheap). You'd need to find a vacuum line you can easily remove, and feel suction into the engine from. Pour some Seafoam into a bowl (maybe 1/3 of the bottle), and use a small piece of vinyl hose to get it into the engine. Put the hose into the vacuum nipple, seal around it with tape, and dip the other end into the bowl. Rev the engine as needed to allow the engine to **** up the fluid. You may need to rev it up during the first couple minutes following the ingestion of the Seafoam - the car will blow black smoke out of the tailpipes and may stumble and run rough. This will let up as the engine burns off the excess carbon inside, and afterward your car should run quite a bit better. Put the vacuum line back on and you're good to go.

Posted on Jul 21, 2008

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You missed two spots.

EGR air passage tube

and

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