Re: Rough idle, no power, won't pull hills
test the vacuum where? there are so many vacuum lines and i can't see the full line on some of them. i have a guage. couldn't find all my connectors and had the wrong size so will do that tomorrow.
also my fuel pressure gauge specifically says it doesn't work on gm throttle body systems... and i don't know how i would t in to the metal line... really big fuel hose? what do you guys use?
unplug a vac line on t/body insert between t/b and line removed.it'll show vac watch it and what it does.let it warm up .
Normal Engine at Idle
When the engine is healthy and working correctly, at idle the needle of the gauge should be steady and within the range of 17 – 22 inches of mercury.
Vacuum should drop to 3 and then momentarily climb to 25 – 28 before settling back at the previous value. This indicates that the valves and rings are OK.
Poor Rings or Oil at Idle
The needle will be steady but the reading will be lower than normal.
The needle will drop occasionally about 4 inches of mercury from its normal idling read
Leaky Intake System
Needle reads low (eg below 5 inches of mercury) at idle. May also indicate late ignition timing or incorrect camshaft timing.
Leaky Head Gasket Between Cylinders
Needle floats regularly between 5 and 19 inches of mercury. May also indicate intake manifold gasket leak at an intake port or a faulty injector.
High reading at first but suddenly returns to zero then builds slowly back to about 16 inches of mercury.
logged PCV or Intake Manifold Leaks
Needle moves slowly through a wide range of readings. Also check idle air/fuel ratio.
can't you get a fitting for a f/p guage to tie in to schrader valve on fuel line to rail[at least there's one on 98+]
99 ext cab auto, 7psi mitsu 14b turbo,ported and coated 2 1/2'' exhaust to turbo muffler,fake cat,underdrive pulley,efan,2.3 t/b,42lb racetronix inj,4.3 fuelpump,aem wideband,pyrometer,f/press guage,.lowered rear 2'',hhr seat , counsole,and almost finished fabbed cowl hood.