Starting Problems, Starting with Throttle but Won't Idle Options

[nmkimosabe]

My 1974 1.8 with fuel injection will only start by manually opening the throttle but I can't get it idle and thus run properly. I recently had the AFM rebuilt and replaced the points, plugs, condenser and replaced the CHT sensor but the problem continues as it did before. I've looked for vacuum leaks to no avail with starter fluid. I now seek the expertise of the members of this forum for additional suggestions.

[TRP]

Congratulations on getting it to start and idle. The struggle with 1.8 and vacuum leaks can be a pain. a 60.00 smoke machine is completely worth the investment.

I'm trying to figure out how you found leaks down at the valve covers!!?

One area that plagued me for a bit was that my Auxiliary Air Valve wasn't sealing all the way once the car was warmed up, causing the idle to hang a bit. My deceleration valve was also not fully closing causing extra air to get pulled back into the system... and again... high idle. Those two items are the opposite of what you are getting.

Keep after it! it sounds like you are close.

Ted

[wonkipop]

Congratulations on getting it to start and idle. The struggle with 1.8 and vacuum leaks can be a pain. a 60.00 smoke machine is completely worth the investment.

I'm trying to figure out how you found leaks down at the valve covers!!?

One area that plagued me for a bit was that my Auxiliary Air Valve wasn't sealing all the way once the car was warmed up, causing the idle to hang a bit. My deceleration valve was also not fully closing causing extra air to get pulled back into the system... and again... high idle. Those two items are the opposite of what you are getting.

Keep after it! it sounds like you are close.

Ted

yeah.

but i don't call open AAVs or open decel valves vac leaks.
i call em throttle assist valves. (IMG:style_emoticons/default/biggrin.gif) thats basically what they are when they misbehave. throttle openings on the sly that activate the AFM flap. because they are piped such that they are between the AFM and the throttle plate.

anything else thats pulling in air after the throttle body is a true vac leak in an L jet.
and usually they won't idle at all and if they do very badly. and probably won't really like to run at all eiher. they can't tolerate any significant air leaks after the throttle plate.

the throttle bodies can leak too around the pivot axle points.
but a smoke test would pick that up.