98 993 intermittent stalling while stopping
#1
Three Wheelin'
Thread Starter
98 993 intermittent stalling while stopping
For some odd reason my car will occasionally stall when I am coming to a stop. You stop the car and it dies. Usually with the AC on. Then you restart it and the idle drops below 1,000 rpms, surges a little and ends up at 1,000 rpms. I've had the idle control valve changed. Thoughts?
#3
RL Community Team
Rennlist Member
Rennlist Member
I would check the running voltage making sure it is above 13.5 volts.
Also the DME Relay
Run the OBDC codes and see if you get anything.
Andy
Also the DME Relay
Run the OBDC codes and see if you get anything.
Andy
#4
Beyond idle control valve and ignition system as mentioned above - possibly a vacuum leak? Rubber gets old.
#5
Three Wheelin'
Thread Starter
Ideas
All good points! The car has 52k miles and was on its original plugs, caps and rotors, and wires. All replaced, along with new air filter. Seems to be throwing a misfire as the hydrocarbons are high at idle. Though won’t throw a cel. Thinking it’s vacuum related
#6
Banned
Do you have a diagnostic tool that can check to see if any codes are being generated?
And try idle adaptation, fully warm the car up and let it idle for a FULL 10 minutes.
And try idle adaptation, fully warm the car up and let it idle for a FULL 10 minutes.
#7
Definitely sounds vacuum related if you've already eliminated the ISV. Do your valves pull shut after shutdown, slight wait, then key to on?
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#9
Rennlist Member
Is your car running a lightweit flywheel?
#10
Three Wheelin'
Thread Starter
More
The car has a new battery- as the old one went dead and was due for a change. The flywheel and all internals are stock. My mechanic mentioned “measuring the lifters”
thanks again for all the help this far
thanks again for all the help this far
#11
"Measuring the lifters" how much would he charge for that? Hard to tell what he means but given the 993 have hydraulic tappets it sounds like calibrating the flux capacitator.
#12
Burning Brakes
I had a similar situation recently. Thought it was a DME going bad.
Purchased a new DME and had the same stalling issues at the lights.
I finally solved the issues by disconnecting the battery for a while and then ran the car for 15 minutes standing still.
Problem was solved.
Good luck man
Purchased a new DME and had the same stalling issues at the lights.
I finally solved the issues by disconnecting the battery for a while and then ran the car for 15 minutes standing still.
Problem was solved.
Good luck man
#13
Does the engine stall happen much less or not at all when the A/C is OFF?
#15
RL Community Team
Rennlist Member
Rennlist Member