Need help with 87 944s/ sunroof and idle

[jrhone]

Hi -- I am a new 944s owner and loving it! 2 problems -- first, idle is rough -- we have changed spark plugs, distributor cap and rotor and spark plug wires. Run beautifully except at idle. 2nd -- sunroof -- wasn't working when I bought it, but when you pressed the switch, you could hear the motor running. So, we took it apart and found the gears were broken and replaced those. Now the motor will only go in one direction -- help! It's hot and I would love to open the sunroof! thanks!

[Mrmerlin]

[QUOTE]Originally posted by jrhone:

Hi Jrhone,try this with the fuel tank filled about half way put in a can of Techron, most auto part stores have it, this should cure the rough Idle that is if everything else is in good working order also check all the vacuum lines and tighten all the clamps to the induction hoses, any of the tri unions that are hard should also be replaced, if the techron doesnt work try another can and then you will need to change the oil as it will be loosening up dirt inside the engine this will get into the oil.
make shure you look at the aux idle valve also this might need to be removed and cleaned out with some carb cleaner.....
For the roof it sounds like you need to re time the roof /cable drive and gears, check out the Porsche 944 garage, it has a lot of info on how to do this.........Stan

[jrhone]

Thanks for the tip on the techron -- I'll try that and let you know.

Didn't see the info on Porsche garage about the sunroof -- perhaps you could point me in the right direction -- thanks!

[quote]Originally posted by Stan Kolen:

Originally posted by jrhone:

Hi Jrhone,try this with the fuel tank filled about half way put in a can of Techron, most auto part stores have it, this should cure the rough Idle that is if everything else is in good working order also check all the vacuum lines and tighten all the clamps to the induction hoses, any of the tri unions that are hard should also be replaced, if the techron doesnt work try another can and then you will need to change the oil as it will be loosening up dirt inside the engine this will get into the oil.
make shure you look at the aux idle valve also this might need to be removed and cleaned out with some carb cleaner.....
For the roof it sounds like you need to re time the roof /cable drive and gears, check out the Porsche 944 garage, it has a lot of info on how to do this.........Stan

[floridaporsche]

If they have never been replaced, than I recommend replacing the motor mounts. I pin-pointed my shaking at idle to the mounts. Its like a smooth sedan now!

[wolfrpi]

A while back I had an 87 944S that shook at idle and generally sounded like it was running on three cyclinders. I replaced the motor mounts and it still shook - turned out that it needed a new balance shaft belt.

As for the idle though, the S's inherently have a problem idling smoothly. It is common to these cars because of their high output and low displacement. There are some write-ups on the problem in cyberspace somewhere. I was never really happy with the idle even after I replaced most of the maintenance parts (cap, rotor, plugs, etc.).

Turns out that Porsche botched the programming for the car in order to enable it to conform to emissions - at least this is the word on the net. You may be able to richen it up or put an FPR on it to see if this helps smooth it out. I could swear that a lot of the time my "S" was running on three cylinders at idle, although it revved perfectly.

Try unplugging the DME and see if this helps erase any error codes, although it is unlikely. Good luck,

Erick

[This message has been edited by wolfrpi (edited 07-02-2001).]

[Mrmerlin]

[QUOTE]Originally posted by jrhone:
Hi Jrhone, to find the porsche garage, do a search type in Porsche 944, and find the one that says Porsche 944 garage then go to garage manual, scroll down to you see the sunroof section it tells you what to do to fix the roof.....stan

[porsche1987_944s]

for the rough idle. turn the idle up, i set mine to 1000rpm, much smoother.

As for the sunroof, mine is doing the same thing it will go down but not up. Took mine all apart still havent figured it out, if you figure yours out let me know.

[This message has been edited by porsche1987_944s (edited 07-02-2001).]

[jrhone]

How do you turn the idle up?

[porsche1987_944s]

On the throttle body where the throttle cable connects to the lever on the throttle body you will see a small set-screw, that is locked in place with a nut. If you look closely, you will see that the lever rests against this screw when the throttle is closed so is you move the screw out it opens the throttle, this will have the same effect as putting a little pressure on the gas pedal.

You will have to disconnect the mounting bracket for the throttle cable by removing the two bolts that hold it to the intake manifold. (There are metal washers on each bolt so dont lose them). Once its off you should be able to get a small socket on the set-screw nut.

Loosen the set screw nut, and turn the set screw in (as if you where tightening it) a few turns. Then retighten the setscew nut, and reinstall the the cable mount.

Start the car and check your idle, it might take a few tries to get it where you want. I set mine to about 900rpm and it smoothed out idle a lot, also I had the infamous problem of the engine dieing when you put the clutch in at high rpm, and by increasing the idle it stopped this problem also, was thinking about increasing idle a little to 1000rpm, because is still drops pretty low once in a while.

[porsche1987_944s]

Oh , and if anyone cares my sunroof problem was the the third limit switch (the one mounted to the back of the assembly).

[Magnus_944]

What year is your car? On my -83 I adjust idle speed by turning the idle screw placed in the throttle body. The screw is on the right side of the throttle body and made of brass. This screw allows air to pass the closed throttle plate at idle. If you adjust idle speed by opening the throttle a little the throttle switch (placed under the throttle body) will tell the DME that it is idling anymore and other strange things might happened... you never know

If you have a 85.5 or later idle is probably adjusted in an other way.

Just my 0.2SEK
/Magnus

[lordgrommit]

Where did you get just the gears for the sunroof ?


Matt

[jrhone]

Originally posted by porsche1987_944s:
Oh , and if anyone cares my sunroof problem was the the third limit switch (the one mounted to the back of the assembly).

what did you have to do -- sounds like that could be my problem also -- thanks!

[Ehab]

I agree with Magnus ... DO NOT play with the throttle plate displacement screw, instead, use the idle screw (brass, mounted vertically next to the throttle cam) which was meant to be used to adjust idle and Air/Fuel mixture.
E

[porsche1987_944s]

My car is 1987 944S, the intake setup is completely different on the S, this is the only adjustment I could find for the idle.

On my sunroof limit switch the connector had vibrated loose somehow, I just put it back on.

[DennisR_944]

Porsche 944 Garage

944 Garage Shop Manual
Sunroof - Plastic Gear Replacement
Sunroof Operation

I got my replacement gears (several sets) at the P-Car dealer. $5.65 US each.

Dennis Russell

------------------
Dennis Russell
Indianapolis, IN USA
1987 944 n/a

[Magnus_944]

Ehab, I'm not 100% sure about this.
I don't think Air/Fuel Mixture will be affected if you adjust the idle screw. If you like to adjust air/fuel mixture at idle I think you should use the adjustment screw on the airflow meter. (The screw mounted vertically under a plastic cap)

/Magnus