5.7 hemi runs but no engine vacuum

chris ok · 11-24-2013, 03:56 PM

I'm working on a 04 5.7 hemi in a ram pick up. runs barely but has no engine vacuum
did a compression test. all cylinders ar 170-190psi.
has me puzzled.
cranks then revs to almost 3k then idles down to stall. on 3rd try will run 575 rpm area.
disconnect both vacuum lines and nothing changes
spray into throttle body, same.
runs on 4 cylinders barely, misfire, does not have the rms feature.
this was my afternoon friday.
any ideas?
engine load weas pretty high on scan tool. no engine codes.
had i think p0700 on transmission.

11-24-2013, 03:56 PM	#1
chris ok Senior Member Join Date: Jul 2002 Location: Long Island, New york Posts: 592 Likes: 131 Liked 46 Times in 29 Posts	5.7 hemi runs but no engine vacuum I'm working on a 04 5.7 hemi in a ram pick up. runs barely but has no engine vacuum did a compression test. all cylinders ar 170-190psi. has me puzzled. cranks then revs to almost 3k then idles down to stall. on 3rd try will run 575 rpm area. disconnect both vacuum lines and nothing changes spray into throttle body, same. runs on 4 cylinders barely, misfire, does not have the rms feature. this was my afternoon friday. any ideas? engine load weas pretty high on scan tool. no engine codes. had i think p0700 on transmission.