engine bay hoses 1.8 L Jet, colors, arrangements etc Options

[wonkipop]

this topic arose in the thread concerning hose colors for D Jet cars.

i've started a new topic so it does not mess the other thread.

first thing to say is that the factory manual is more scant on L-Jet information than for D-Jet. There are no hose schematics with the clarity of the D-Jet layouts for the L-Jet. Secondly some of the information on the L-Jet is misleading.

First thing.

car 1974 1.8.

Green vacuum line from Distributor.
Seems to be the same as the D-Jet cars.

There is a green vacuum (retard) line out of the distributor body to the throttle body.
I think i am right saying its the retard side (sometimes gets dyslexic on that).

The green line in this photo is an original vacuum line. Along with the crankcase vent hose these are the only two lines i did not replace on my car. The crankcase line is moulded to an S - shape and we decided to stay with the original. its still sealing ok.
Same with the distributor line. We checked and still pliable and it was sealing so it stayed. We cleaned it up a little. I also left the intake manifold seals on as we did not go that far in - requires disassembly of the intake manifold. They are still in good sealing condition though looking a little aged.

There is a black vacuum (advance) line out of the distributor to the throttle body.

The green line from the distributor was the only colored line still apparent on my car.

[wonkipop]

got to the bottom of the decal valve mystery.

pulled out the floating valve and found the part # still on it.
Bosch 0 280 160 200.

its a fuel pressure regulator valve subbed in for the decal valve.

not done by me so predates 1989 and by original owner or dealer/mechanic.

we thought about it.
we reckon its a clever emissions cheat from back in the day.

most people here, first thing they did with their 911s back then, was to block the small vacuum line of the decal valve with a ball bearing. or they just pulled it out and plugged it. owners hated the decal valve and the slow idle drop, not what you wanted cornering a 911 off and on throttle?
think it was done a lot in the USA too.

subbing in a fuel pressure reg valve does the same thing. plugs the small vac line.
but passes visual inspection on an emissions inspection if not looked at closely?

i think i will leave it in, its part of the history.
now i know what it is. we might have a bit more of a think about whether its doing anything - we don't think it does anything wrong?

car drives great, always has. comes off throttle nicely.
never had any serious backfire issues, just occasional pops and burbles out of the back.

will just mount it properly.
which i would have to do anyway even with reinstalled decal valve given new fuel filter.