Hello I have a 97 Cadillac Seville that I am trying to get going again. The on board error codes P0300,0108,0603,1599. My code reader picks up P0301. She has to be hit with starting fluid to start cold, hard to start after being warmed up for a few minutes, and won't start until it cools down after it has been driven until it is completely warmed up. If I push down the accelerator past 1/2 quickly the engine almost dies(acts as though starved for fuel) and while idling it will slowly flood until it dies on restart the engine speeds up like it was overloaded with fuel for just a minute or two and then the cycle starts over with the smell of unburned fuel coming out of the exhaust. It will loose power while driving, backfire loudly, and then drive ok for another hour or two.Since purchasing the car it has lost a huge part of it fuel milage 15 to 20%. Any direction or advice would be greatly appreciated Thanks Rich
Being that there are misfire codes, (300 series P codes), and it's flooding I would put a fuel pressure gauge on it and try to check the injectors and the fuel pressure regulator for leakage. If the vehicle has sat for a while, 1 or more of the injectors may have stuck open. If the fuel pressure is way to high it can cause the pressure regulator to leak. See if that helps.
SOURCE: How can I bypass a anti auto theft system on my 1990 cadillac seville?
I Have A Seville 1990, When That Happen To Me I Got The Inginion
Replaced Problem Solved. What Is Happening Is Your Key Has A Chip And That Chip Is A Resister And When The Valve Is Not Sented To The Computer It Disengages the Fuel Pump And Than Tells You To Wait. Soon All That Will Happen Is You Will Get The Wait 3 Mins And It Will Never Start, A Good Locksmith Can Take Care Of This For You And That Will Save You Some Money. Cause If You Go To The Dealer Ouch They Will Hit You Up. But I Asure This Is How It Will Happen Cause It Is How It Happen To Me
And Sorry There Is No By Passing The Computer
SOURCE: I have a 1992 Cadillac
You are going to have to replace the TPS(throttle position sensor) to resolve the issue
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