llhat

checked for a clogged catalytic converter...

i believe the Renix system relies on a variation in fuel pressure to perform, the standard regulator does just that... mine IIRC when just running is about 32psi, if the vacuum line is removed from the regulator, it increases to 39psi i think that is by design. confirmed with this entry from a manual i downloaded... renix regulator.pdf

on the 'stock' regulator, it self adjusts by the connection of the vacuum line. IIRC, at low vacuum ( experienced during acceleration) the pressure to the injectors is increased for additional fuel flow. High vacuum the pressure is lowered. I'd have no idea on the differences between the two listings on RO those two listings... the specification table seems a bit confusing to me... with a lot of contradictions, especially on the PR21T part finish... chrome, then regulator finish, silver.. ?? material.. stainless steel ? boost vacuum reference port (no), then below stating 'reference port included (yes) connector type (pin)... there is no real connector on these. inlet quantity (1)... where PR21 shows (2)... hmmm think i procured mine off of evilbay and 'so far so good'...

i would still plan on replacing the regulator, be sure to also source the 'kit' for the hard line "o" rings..... this 'could' be pressure related, as the pressure drops from engine off, the leak threshold is lowered. "Could" be temperature related.. waaay out in left field, porosity on the regulator housing... good luck!

guidance on removing the lens?

ok, thanks... so reapplying resources/load to help an anemic engine....

educate a non-2.5 owner... what does this switch 'do'...

it is already on the site...

the IAC is a stepper motor, so you do have one. the 'steps' move the pintle in and out exposing or closing the idle air bypass. the IAC is in play at idle, adjusting air bypass to control the idle speed. the 2.5 has a electro-mechanical stepper acting on the throttle lever itself.. as it was a 2.5, i did not include.. all i posted was from the 1989 service manual. thanks OHM for posting an image of the tool.. i had never seen one, imagine scarce

some instructions from manual... have NO idea what a stepper motor exerciser is... lot of reading text comanche.pdf p 584 is stepper.pdf

i wanted to do this few years ago during a fuel pump failure and dang near full of gas... tried a piece of fuel hose ?(5/16 ID) and i could not get it down the filler neck... for a 'test' I took a smaller piece of hard nylon tubing that was like 1/4" and it was troublesome getting it down there... maybe doable, but not easy.

dorman also makes a unit, get at you local FLAPS, or even evilbay...

i'd guess the dye is a good process, as 'some' external coolant leaks will disperse and not puddle or accumulate in cavities

IIRC, the pressure bottle on the firewall has connections on the water pump and thermostat housing... I'd expect some type of flow depending on how the connection on the thermostat housing is constructed ( "behind" the thermosat in the block or on the radiator side )... I also need to top my 89 off periodically, but "I" have some certainty that "I" have a weeping heater core, though my floor is dry as a bone.

i believe a jpeg, save to computer and enlarge.. I see OHM has posted a link also thanks.