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Originally Posted by 97 SL320
It needs to open and flow exhaust into the intake. On most cars, manually opening the EGR at idle should stall the motor ( or at least make it run very rough ) If not there isn't enough flow.
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I have some instructions...I'll have to try this again.
I dodn't know if I was able to complete the test as the old egr rubber was fused at vac line to egr valve
I was able to re move it with aid of heat from hairdryer
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Also make sure the EGR opens by vacuum when it should, ( usually part throttle with the engine loaded, just like distributor vacuum advance )
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not sure
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Engine temp is less of an issue, it is high combustion chamber temp that causes high Nox and something you won't be able to measure.
If this car has a 3 way cat it might be failing resulting in high Nox.
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My guess is cat is old& will try to take its operating temp when I get the temp gun
Good stuff guess hope its a vac leak making it lean, exhaust pipe leak is also a good possibility...do they mean exhaust pipes?
Also have to see what a idle hose is thats sticking out. Some say rement of a old washush sp? heating system.
So a/F ratio...would that also be affected by vacumms? or is it just an adjustment of fuel ratio?
Guessing both.
WSell first thing is to try to change more rubber parts that I can do myself & see what that does.
Also check the EGR line.
I have tubing ordered & could change out the entire line.
Hmmmmmmm it all helps & its best I learn on the car not a tech
Thanks!!!
