Buick died in Garage - please help

[tonyp4357]

Hi all, I need some help PLEASE. buick lesabre 2000, 98k on it.
Here is what I did, and what happened.(please excuse the length, but rather I tell it all)
Did a general service of Oil change & airfilter change. Replaced plug leads & plugs(Bosch platinum).Drove to the gas station filled it up & added Injector cleaner into the tank (Techron) and went for a drive. Made 6 stops and drove a total of 76Miles, parked in the garage and changed the rotors and pads. Came to re-start it. It fired & ran for 2 seconds then nothing, this is how it repeatedly has behaved.If I crank it straight afterwwards nothing. It just cranks over whether my foot is flat on the gas or off the gas. If I wait
5 minutes and crank it , it will start for 2 seconds again and repeat as above.

Here is what I have tested and replaced:- Replaced ignition coils and module, (called a car specialist who has a call in program on the local radio station and he told me to do that.) Replaced fuel filter,tested fuel pressure with the following readings:- pump primed it reads 47, when I start and it runs for those 2 secs it goes down to 40, then when I crank it and it wont start it goes up to 50.
The injectors, I tested voltage with the ignition on it read 5.25volts, when cranking it read 3.8 - 4.2volts.?? Pulled the plugs out and there is fuel on the plugs. Tested the plugs, and there is a good spark. I diconnected the positive on the battery and left it off for 5 minutes and tried it again but no change? Can anyone assist, who has experienced this or who has a good idesa of what it could be? I discounted fuel pump, as it seems in range? The strangeness for me is that I drove it into the garage and it just wont re- start??

[HotZ28]

You said you have spark, was this checked after the 2 sec run and then no start cycle?

[tonyp4357]

Originally Posted by HotZ28

You said you have spark, was this checked after the 2 sec run and then no start cycle?

Not immediately after, but a while inbetween I pulled the plug and tested it.I'll test it with one plug out and see

[HotZ28]

The best way to test spark is to use a plug gapped at 100 thousandths, hooked up to the ignition wire and use a ground wire to the plug body (metal part) to engine ground. (Jumper cables work fine). Then, turn the engine over, to see if you have a "hot blue flame" across the gap.

[tonyp4357]

apologies for the long delay in replying, I did as you sugested and it sure gives a nice bright spark.

[maxwedge]

Spray carb cleaner or starting fluid into the intake see if it kicks over. Any aftermarket anti theft device or alarm on the car? Also may have to get a noid lite and see if you have injector pulse.