Cadillac Repair/1999 sts hard start
i have a 1999 Cadillac sts, i can jump in and sometimes it will start without an issue and other times ill get in and hit the key and it will just crank and crank and you have to crank it multiple times and then it will fire up and run ruff for a few min. then smooth out an run perfect, my fuel pressure is 43psi while running and over 50 with the key on. i already replaced the ignition switch so what could cause this issue?
I understand the good fuel pump pressure, however the fuel pump may be on its way out. One complaint for continual cranking without starting would be a problem at the fuel pump. When is the last time the distributor cap and rotor were looked at?
Your biggest problem here is that this problem is intermittent and is hard to get some sort of common denominator for diagnoses. The second biggest problem is logistics and I am not at the car.
You could go on Ebay or Craigs and buy a factory service manual. There are diagnostic flow charts that may assist you. However, the problem must be there at the time you are trying to diagnose it, or you are just guessing, which leads to unneeded parts changing.
Just so you are aware, there was no reason to change the VATS ignition lock. There is nothing wrong related to the so-called vehicle security system. Has nothing to do with fuel or electrical in anything other than the start position. The common issue with VATS is that the wires in the ignition harness would break inside the plastic casing and then go back together tilting the column in many cases. This would cause a no crank situation with a warning on the dash, saying the engine would not start for 3 minutes and a security issue. In no way does it have an issue like you are describing.
It is very common because people are not familiar with the way the so-called anti theft works, that if there is any type of drivability problem, the first place they go after is the security.
Dealers were good to blame any after market accessory including a stereo for drivability issues and everything else. Why? Because they had no concept as to how anything other than factory installed components worked. This is not an exaggeration. I dealt with it and the technicians when I was a service manager.
I just wish you could have come to me before wasting the money on replacing the ignition lock. Oh well, now you understand the VATS.
I wish I could be of more help, but without being at the car when the problem pops up, I do not want to try to change parts on a guess. You really should have a factory service manual anyway, because it is great for diagnosing so many problems and it tells you exactly where everything is, how it works. It is by far the best tool anyone could own if they want to work on their car without the guess work.
Thank you for the question and if you can some how give me more details like weather affecting the vehicle when the engine does not start, something and possibly I might be able to assist you farther.
I hope you don't mind, but I thought I would hawk our business a bit.
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