: 99 STS Starting hard then STALLING..Help!!

04-18-05, 01:12 PM
Hello everybody, especially you Bobb (your knowledge is impressive :thumbsup:) this is my first time, so hope it works.

My buddy and I each own black 99 STS's and I have never been happier with a car, however my buddy's car is giving him fits :banghead: .

The problem: the car starts hard 5-6 secs of cranking, runs for a second or 2 then stalls.
All the lights in the dash die as this happens. You can immediately retry, and if you ar living right it will run fine, It most instances it will continue this behavior 10 to 20 times Well this is OK in a garage or your driveway but at an intersection, it is VERY embarassing, not to mention dangerous.

Things which have been done (not all pertaining to this problem).

O2 sensor replaced
ECM replaced
New plugs
New wires
New Crank Sensor(1 apparently there are 2?? and that is next)
255/45R18 Tires on Chrome rims
Cross drilled rotors with ceramic brake pads
K & N Filter Mod (removed the wafer from the MAF Sensor)
Have completely disconnected the Instrument Cluster
Have completely disconnected the Security Module ( under the passenger side dash - glove compartment)
He has traded all the fuel modules/relays with my STS
He has traded the base under the coil pack with my STS

Still does the same ^**(% thing, very discouraging.....

To me it seems like a chip in the key/security problem!
I do no that he has not driven it for 6 months, you can do this when you have several vehicles, BUT Man summer is coming and this baby needs to fly!!!

I am not sure if anyone is familiar with this problem, but have to say that we are stumped.

Could use your help


04-18-05, 07:36 PM
Has he checked the fuel pressure regulator?

04-19-05, 10:38 AM
Yes, working fine. and also changed the cam sensor. I should mention that the car has 110,000 miles in case that matters.

On another note I need rear shocks and I believe I was only out for 10 minutes or so when informed of the price....I guess they have found a way to liquify platinum...... wow...1065 $$ each - Canadian that is. The very best price here I could find was 700.00, there has got to be a lower price some where!!!?

04-19-05, 11:43 AM
Get passive replacements. Don't bother putting the stock units back in, they fail quickly.

04-19-05, 01:10 PM
What does it do to the ride? Does it leave it in sport mode continuously?