When a start my car warm, my car dies when I press the clutch. It goes too low and does come back up. I know my BAC valve is ok cause my revs go up when I put the A\C on. So tought about the dashpot. Try to adjust it by opening it a bit more with my TB in my hand (no mesurement done), but it made no difference at all ! The dashpot rod seemed ok.

Even with my car warm, the idle drops way down (around 400) before going up but it doesn't stall.

And I found this :

I know the dashpot rod is supposed to touch between 2700 and 3100rpm. I have to take my TB out to adjust it cause it's an NA and I can't really adjust it otherwise.

"TPS between 1.8K ohms and 3.8K ohms" This for an 88 turbo, mine is an S5 NA, is it the same thing and is it a correct way to adjust it ? Cause the range seems pretty large !!!

I'll try it anyway, but would there be another thing that would resolve my problem ?

 

My $0.02 worth...before you even start thinking about dashpots and BAC's, is your TPS correctly set? 1000 OHMS, engine fully warmed up. Once you've ensured that, have you then gone back and adjusted the idle to 750? Again, engine fully warmed up, initial set connector shorted, adjust by the screw on top of the TB.

If all that's OK, have you checked for vacuum leaks? Unmetered air into the system will cause stalling and idle crash.

Work the simplist things first and then on to the more complex.

 

My TPS is set correctly, vaccuum all been changed this winter, changed my oxygen sensor too. My idle is set at 750 and is really stable. The only thing left that I could think of is my dashpot...

Thanks fo your answer...

Anything else anyone ?

 

check battery connections and alternator.

 

Alternator charges at 14.4V... and stupid question, how do I check the battery connections ?

 

just look at the battery terminals, and the clamps. If its dirty clean it up either using the battery cleaning tool, or wirebrush. And if its loose then tighten it up.

 

the s4 and s5 procedure is different just because of the difference in tps design. 1.8k to 3.8k ohms on the s4 narrow range TPS is only like an inch of pedal movement.

just follow the s5 fsm procedure, it may help. I know adjusting it made a big difference on my car but I have a lightweight flywheel.

 

The dashpot is I think impossible to adjust on the engine... so how do I figure out it touches around 2500 rpm ? I tough if I had the TPS mesures at around 2500 rpms, it would help !

Nic

 

They're new !

Nic

 

unless the s5 dashpot is different, just look at it and you will see a locknut underneath the mushroom-shaped top. Loosen that nut (it may not loosen easily if it's never been touched before) and the you can physically screw the mushroom part itself to adjust it.

 

If you live in an area where the weather changes from hot to cold like it did here for a few weeks then i would just check it out and make sure.
Unless you already did and thats how you know its new.ha

 

My dashpot doesn't look like the one in the FSM pictures... the locknut is the other side of is support behind the TB. Anyway, I'm going to take a look again as soon as I have my other complication solve : key broke in the key cylinder.

Thanks fo your advice.

 

Does your dashpot look like the first image? If so, you can get to it from the firewall side standing on the drivers side with a 17 mm wrench like the one in the second image. It ain't easy, but it can be done with a little patience.