2000 5.7l Express won't start

[ggmurray]

Hey Everyone,

Having a tough time figuring this one out! The 5.7 will not start, it turns over and I have some what of a spark from the coil wire to the block when I tested it, I also have spark to a test sparkplug when I held it to the exhaust manifold but I'm not sure if it's at it's at the proper output level since I don't have a calibrated spark tester. Anyway here is what I've replaced so far, The module, coil, crankshaft position sensor, and yes I'm broke now... When you turn the key on you can here the fuel pump come on and shut off once it hits 64psi according to my gauge, so it appears to be in the right range....I looked the wiring over but don't see anything that could be a possible problem. Please does anyone have idea what I should do next?????

[maxwedge]

Welcome to AF. Does it start with starting fluid sprayed into the intake? Lots of problems with caps, rotors and the coil wires in my experience.

[ggmurray]

Hey "M"

Sorry for the delay, I was searching through the another threads about starting! Lots of good stuff there, Anyway to answer your reply, no I haven't tried the starting fluid, I spent all day double checking everything...module coil etc. Do I just take the air filter element out and some fluild in the box? or do I have to get passed all that I guess after the mass air-flow sensor...let me know if you have time Thanks for the help

[ggmurray]

Hey "M"

Should the starting fluild fire it up, would that mean I have contaminated fuel in the tank since I have 64psi at the rail.

[rhandwor]

Use a noid light the security system will off shut power to the injectors. Other people have had this problem. As Max Wedge stated it should start and run as long as its getting starting fluid. This is a picture of one.
http://www.autopart.com/tools/toolsmain/tool/T_3401.htm A single one would be 3410. Most parts store sell them but the kit is a lot cheaper than what I paid.

[ggmurray]

Hey RH

Can you help me with the starting fluild??? Do I pull the boot off of the throttle body at the intake or just pull the air box out and get passed the sensors, and just a quick shot right.....Also new cap, rotor, wires, plugs, Thanks for the help

[rhandwor]

I would remove the boot at the throttle body. Have somebody else try to start it as you you give it a couple of sprays as it starts continue enough to keep it running. Open it so the spray goes into the engine.
I remember a post and he gave the wrong engine and everybody thought low fuel pressure but his security system shut it down.

[ggmurray]

Hey RH

Got ya, I've already pulled the boot back and opened the throttlebody and shot a couple of squirts in and then tried to crank but it didn't help any....didn't try and hold it open while someone sprayed "Standby I'll give it a try"

[ggmurray]

RH,

No luck on the starting fluid, I put the boot back on, and then pulled the wires off the cap so I could take the cap completely off the dist. it looked fine but I hit the poles with a piece of cloth anyway and the rotor too, still no luck after I put it all back together....checked for spark again from the coil
piece of wire from the block to the coil wire and still get a spark but it'[s not super blue looking.....Oh code 1351 but checked all the electrical plugs and wires they look ok...only thing I haven't replaced is the cam sensor......Oh Security system what can I do to check for that or reset????

[rhandwor]

The security system shuts power to the injectors. Use the noid light if it blinks the security system doesn't have you shut down. I use a analog DVOM and with the camshaft sensor disconnected the dial will sweep if cranking the engine the leads are connected to the wires from the sensor.
You also have a crankshaft sensor to check by the starter. This is on my 5.4L 2000 silverado.
As you say you have spark I would use a DVOM and make sure you have power to the injectors you have 8 like my 5.4L. Remember the computer completes the ground these pulses fire the injector. If you have a 12 volt test light use a paper clip and hook the ground for the light to the clamp and this way hook up to the wire while somebody cranks the engine, the test light should blink. A quick test on one will give you a lot of information

[gkh7890]

GGMurray,

Must be the year of the vehicle b/c I too have this problem (throughout the year) and just had an episode of my 2000 G1500 5.7v8 not starting.

Replaced the fuel filter in Nov., (PCV too). Traced out all the fuel pump, fuel supply relays, etc. The only thing that I can come up with is that the fuel pressure regulator (FPR)needs to be replaced. Tank is full of gas, the pump comes on, etc. The only thing I have not ruled out is the fuel pump pressure.

If it is the FPR, according to my Haynes manual, in order to replace the FPR, you have to take the intake system apart to gain access to it. THAT really sucks!!!!

Anyone else have any ideas???

Best of luck w/ your problem!!!

[gkh7890]

Oops! Forgot that my mechanic did test the fuel pressure and it was fine.....after he replaced the fuel filter. It was completely clogged/stopped up.

[ggmurray]

gkh,

Ya your right! lots of work to get to the FPR....make sure you put a gauge on it 1st, mine is running 64psi which according to what I read in the Haynes manual is pretty close 60 to 66psi. let me know how it turns out! good luck

[gkh7890]

I would love to get some of those GM engineers in a room for a few minutes. They should have to work on what they design and if they can't do it, then make the necessary changes!!!! ARGH!!!!!!

[ggmurray]

RH,

Thanks so much for all the help! I need to read up on the noid light, it's new to me...and AutoZone didn't have one or ORiley's...looks like I might have to order one from the website link you sent. Anyway thanks for the info on the Cam and crank sensor, I'll put my DVOM on it tomorrow. It's dark now...The test light...I'll read over it closer for better understanding, but I think you talking about testing the injectors right....without using the noid light....I have a test light, no problem....pull the electrical cover off the top of the injector housing right and check at any injector/or all of them. Will you be checking the forum tomorrow too?