can someone explain this

[chrisisg77]

I have a air leak between the EGR and lower intake manifold. I know i do because i can hear it , it beeps and made sure with a stethoscope. Anyways my question is how come when i start her up it doesnt beep ONLY when i reach around 1500rpms or so then the beep stays forever even at idle? Also why doesnt it affect my idle?

 

[jetjock]

The answer is intuitively obvious.

 

[Dan_Gyoba]

TSRM Page EC-16

 

[chrisisg77]

Ohhh i see its because at start up the coolant temp is below 57c so the egr is closed along with the vsv. I knew that the egr opened and closed but thats all. I havent had time to read up or even work on my car its just been sitting there .i have been really busy.

 

[jetjock]

The EGR doesn't work (what stops it from working)

1) when the engine is cold (vsv)

2) at idle (ported vacuum)

3 above about 4300 rpm (vsv)

That said I r cornfuzed about how you can have a leak (one that beeps no less) between two parts that aren't connected...

 

[chrisisg77]

Okay i got that .EGR valve i mean ... Anyways i took apart everything and guess what ? Again a cracked/broken egr valve this is the second time. Turns out it cracked from where it bolts on and fell off the lower intake manifold and wasnt even bolted on. I remember i had trouble bolting on the egr valve the first time. it wouldnt reach and bolt on right. Anyways i think im going to get a brand new one. Better than getting a 20 Year old one and make sure everything bolts on right

 

[chrisisg77]

Hopefully i dont need a new cat maybe a clogged cat is causing excessive back pressure making my egr valve break? But im not losing performance or doesnt sputter when accelerating .