wReX

iTrader: (6)

Well I have been playing around with my A/C and swapped in some new plugs this past weekend. Took her out for a spin and everything is great. Start up/Idle was fine right at about 950rpm...pulls strong... problem is when I am driving and go to hit the clutch to coast to a stop the idle gets 'stuck' at 1500rpm, once I come to a stop it drops to 1400, after about 3 seconds it drops to 1200 then about 6 or 7 seconds later it drops back down to normal 950.

Anyone have a suggestion where to look? Intake or Vac leak? Setting in the Power FC to check? I have not touched the TPS or anything else.

Just trying to get some possible leads on it for the weekend when I will finally have some time to play with it. Thanks in advance for any help.

'93 race port, stock twins(full non seq), Power FC

rajeevx7

iTrader: (11)

Bumping this to the top because I have a similar issue....just not nearly as high rpm's and it takes less then 7 seconds to get normal again.
I think I remember it starting after my full non seq was done, but I have just been living with it.
Stock Ports for me.

rajeevx7

iTrader: (11)

Bump.

Running a PMS aswell.

But this problem must lie in something that changed after the non-seq conversion, just don't know what. Everything else is perfect.

Raj

BOTTLEFED

iTrader: (1)

Check the dashpot on the TB; it slows the throttle down when you let off so that the plates do not slam shut. It works like a shock absorber for the throttle plates. If it is adjusted wrong it may be holding your throttle open as it compresses, or it may be sticking.

rajeevx7

iTrader: (11)

Thanks Bottle, will check it soon. Last time I had it apart the plates would snap shut normaly though.

wRex, did you remove your Double Throttle like me as well?

Raj

TexanSeven

I've got a similar issue on my FC. It happens with or without the dashpot installed. On my car, when I calibrate the TPS to 1volt then manipulate the throttle linkage to WOT and let it snap back it doesnt return to 1volt everytime. It might be 1.03v or .97v I don't think it should vary that much which leads me to believe there is something wrong with my TB. Not sure if this is any help...

rajeevx7

iTrader: (11)

Well, upon some more driving of my car this weekend I found the symptoms to be exactly like the WReX's.

I think the most important thing that I noticed was that when the car coasts to a stop, when the speedo needle EXACTLY drops below zero and the car stops moving is when the idle drops from 1500.

Could all this business be speed sensor related?