Very Poor Performance (Partially Solved), Just replaced 5sfe and having problems Options

[joeladam02]

Story: Just replaced my 5sfe (lost compression in cyl. 1) with another one that supposedly has 100k on it.
Rebuilt entire top end. Brand new plugs, wires. All sensors transferred from old motor in working condition.

Symptoms:
Car won't idle steadily...very rough miss.
Has no power. Absolutely no bottom end.
When I am cruising at high RPM's and press the clutch, the engine stalls.
Also stalls every time I come to a stop sign or try to slow down and turn in somewhere.


Any ideas?
I've checked grounds, plugs, wires, timing, vacuums, sensors. Dizzy worked on old motor. I'm flopping like a fish here.
I haven't gotten any CEL's. Haven't had a chance to test compression just yet either.
Please tell me the bottom end of this motor is not bad too. That will make 3 bad bottom end 5sfe's for me if it is. And I will probably drop a stick of dynamite in the car if that's the case.

This post has been edited by joeladam02: Aug 15, 2009 - 9:49 AM

[joeladam02]

Figured it out.

There was no vacuum going to the Fuel Pressure Regulator. Therefore it was stuck on at maximum pressure, pumping as much fuel as the fuel pump could throw at it constantly.
Hose was connected, but no vacuum coming from the intake.
We just stole vacuum from a different spot with a splice, and it runs like a charm.
I believe the reason there's no vacuum has something to do with changing the throttlebody.
Apparently there are two different types, which might use a different gasket, or be proprietary to their respective intakes.
I know we switched it, btu we did not switch intakes as well. Can anyone shine some light on that subject???

I think this was done for different years, maybe the placement of the MAP sensor being changed too.

Anyways, eventually I will check it. But it runs great now that it has vacuum...