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Showing results for tags 'vacuum leak'.
I have heard many times that these l28 EFI engine will stall if you remove the dip stick/ pcv hoses while the engine is running, however mine will stay running without any of those things in place. Does anybody know why that would be? I recently replaced the pcv valve to see if that was it but that made no difference. I've been told vacuum leaks will cause this however my manifold vacuum readings are proper through the whole rpm range. Starting to think it's gotta be piston rings or something...
I finally got my AEM UEGO hooked up yesterday and my AFR's were initially a little erratic. As the car runs for a few seconds the wide band shows AFR's between about 14.5-16, and sometimes it completely stops reading momentarily (goes way lean) and then goes back to that same readings. I just put my fuel pressure gauge on and it was reading 21 psi with the vacuum hose attached and 30 psi with it off. Obviously this is symptomatic of a bad FPR. However could a vacuum leak cause this low of pressure? I thought I saw somewhere that a NA FPR was the same as a Turbo, however the FPR off my 77 set up has two feed lines and the Turbo one on the car now has 1 feed, 1 return and 1 vacuum.