Re: [86 8v, JH] engine start problems

["Randy B" <scirokn81@email.msn.com>]

Oliver,
I've had a similar problem with my Mk1 Scirocco's with CIS.


>Hi -- in tracking down my engine problems (86 8v, JH engine) I'm having
>the following behaviour.
>
>I'll start the car cold, and my idle speed will be relatively low (around
>700RPM; I don't have an idle speed boost valve) and the engine runs rough.
>After a short period of time (on the order of 10 seconds) the RPMs will go
>up to normal speed (950 RPM) and all will sound well. If instead of
>leaving it idling I rev it up to 3000 RPM a couple of times, the idle
>speed goes normal much quicker.

Sounds like the auxiliary air regulator if you have a JH motor, and
you are running CIS injection. It should be on the back of the intake
plenum. It will have two small hoses running out of each end and
if I am not mistaken opens up and bypasses the TB when the engine
is cold and closes once the engine is warm.
To check it, I pulled mine off, put it in the freezer for about 1 min. and
checked it (should be open when you look through the center of it
where the hoses mount up) then I immediately put it in the oven at
lowest setting for about 1 min and checked it (it should be closed).
Mine did not pass the test, so I went to the local pick-a-wreck pulled
two of them, brought them home tested them and the problem was
solved, plus I now have a spare.

>This doesn't happen all the time, but most of the time (I've got in the
>habit of starting it and revving it a bit right away to get the idle speed
>normal).


This could be because sometimes the engine may be warm enough
(driven the car earlier in the day) and it doesn't need the bypass ?
Could be something else, but this one's easy enough to check.
Hope this helps.

Randy B.
Cosmos 81 Scirocco S - soon to be 2.0L 16V
Mars 81 Scirocco S - t t 1847cc



>No, I haven't checked fuel pressure yet. Know where I can get a cheap CIS
>fuel pressure gauge? Someone mentioned getting one for $40 recently;
>where?
>
>The fact that it goes away on it's own after cold starting makes me think
>it's my cold-start valve. I know the valve is working, but I haven't
>checked it's spray pattern yet; could I expect something like this if the
>fuel wasn't being atomized properly (like perhaps the fuel is entering the
>cylinders more liquid-like)?
>
>I also have an intermittent hot-start problem where the engine will start
>but without a lot of effort (holding the key to start and opening the
>throttle) the engine will stall. Since my car presumably has a hot-start
>pulse relay on the cold-start valve, could this be another indication of a
>problem with it?
>
>Just wondering whether my suspicions about the cold-start valve might be
>correct and if I should bother dragging a friend over to the car so that
>he can turn the key while I check the spray pattern...
>
>Thanks,
>Oliver





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