crank no start 5.4 2000 xlt

[hartsemperfi]

Hello guys I let truck sit about 2 wks no starting maybe longer. Checked for codes found a p1288 temp guage reads C as normal. I havent checked much considering its just been sitting.

 

[stamp11127]

Check fuel pressure or cycle the ign key a few times for @3 sec between off & run then try to start.

 

[hartsemperfi]

Is the theft light suppose to blink while cranking?

 

[stamp11127]

Not from what I remember. A slow blink is the normal warning, fast blink is the anti theft at work.

 

[docraymund]

Try checking for spark pull out 1 coil and boot and connect it to a spark tester. If you dont have one, just use another plug and place the plug on something metal and have an assistant crank the engine. If it sparks, you have ruled out the cam sensor and the ecu and the fuel injector cycling.
Then listen for the fuel pump running insert a short piece of stiff garden hose into the fuel fill inlet. Have someone turn the ignition switch to on position and listen for a short whirring sound. If you hear that then the pump is ok.
Then check for fuel at the schrader valve. Use a fuel pressure gauge if you have. If fuel pressure is present, then the fuel system can be ruled out.
Last check, assume the engine is flooded pull out the fuse for the fuel pump and start the engine while fully deppressing the accelerator pedal. If it wants to start after that put back the fuse and start it again normally.
If it still wont start, check the wiring of the MAF sensor. Because if the MAF sensor is disconnected, the engine wont run at all.

 

[stamp11127]

How is his engine going to flood sitting like he stated in the first post? Even if an injector leaked down, once the fuel pressure comes up it runs.
Two ways to go around the block on checking for spark - I like the starter fluid/bomb in a can method. Give a little shot and crank it. If it runs then spark is present. Or you can start taking things off checking for spark here and there. Once you see what these high energy coils are capable of, a smart person stays away from them. I have a bunch of respect for gm's HEI coils...
I'm over 50, somewhat lazy and don't look forward to busting knuckles anymore while fixing things. I follow the KISS idea....

 

[hartsemperfi]

Thx guys i will definately give u some feed back this evening been very busy.

 

[toms89]

Is the theft light suppose to blink while cranking?

If you have a rapidly blinking theft light while cranking the pats system is keeping it from starting.

 

[toms89]

'Last check, assume the engine is flooded pull out the fuse for the fuel pump and start the engine while fully deppressing the accelerator pedal. If it wants to start after that put back the fuse and start it again normally.
If it still wont start, check the wiring of the MAF sensor. Because if the MAF sensor is disconnected, the engine wont run at all.'

Just holding w.o.t. while cranking should put the ecm in clear flood logic and it will not inject fuel. Disconnecting fuel pump is not necessary.

It should start and run with out the MAF sensor connected as well. The pcm is not looking for the maf signal until it has started and running and timed out of the start logic. I have started mine with it disconnected and it was a minute or two before the cel even came on.

 

[hartsemperfi]

Well this has been the longest update prob to ever take place but on Monday aug 29 i finally replaced the complete fuel pump assembly and external filter. When i did i drained the fuel tank completely. The truck started and ran. I listened to hear the sweet humm of the fuel pump before i started. Thanks to everyone for your feedback.

 

[AZ59apacheguy]

Check fuel pressure or cycle the ign key a few times for @3 sec between off & run then try to start.

Is this procedure used to prime the fuel system/fuel rails?

 

[hartsemperfi]

Yes it will pressurize your sys,but all i did initially was turn the key to listen for the pump then i started. Just one time.

 

[RonB1964]

My fuel pump went out at about 140K. Symptoms were the same, cranks but would not start. The fuel rail did not have pressure, I was able to temporarily get the fuel pump going again by having the key in the run position, then rapping on the gas tank with a hammer near the fuel pump to get it unstuck. It was enough to get me home and to a repair shop to install a new fuel pump. At 200K, still going strong.

 

[hartsemperfi]

Congrats i wasnt as lucky knock on wood on that.