V8, 4x4, gas engine, automatic tranny, 85k miles. Stock as far as I know. Fine one day, the next day, it just clicks (the relay under the dash). No engagement of any kind in engine compartment. All dash lights work, radio lights work, ammeter is showing good battery. The power locks randomly go up & down by themselves when trying to start. I cleaned the post & replaced the ground cable post clamp, no go. Tried to jump it, no go. Tried it in neutral, no go. Moved gear shift from park to D3 and back, no go. Too wet, snowy, & nasty to lay on ground & tap starter without being sure that will work, or finding tarp or plastic to lay on. (we just got 5" of snow). Thanks in advance for any help you can give me.
On the fender well near the battery is the starter relay using a wrench or screwdriver try jumping the two large terminals and see if it starts if it still does not make sure that where the ground cable attaches to the motor is tight, if it is even 1/2 turn lose could cause no start problem.
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First thing to do is have someone check the computer for trouble codes. You'll have to figure out if it is a fuel or ignition problem. You can check for spark at the plugs and the fuel pressure. It could be a relay, the ignition module, coil, fuel pump, or a list of other things.
There is a cube relay next to the fuses for the ignition. If it goes bad the engine will turn over, but it will not start. There are two large (~1"x1"x1") relays next to each other. One is for the electric radiator fan relay and one for the ignition relay. When my ignition relay went bad and I switched the two...the engine turned over but would not start. This does not explain the other issues, but who knows they may not be related.
You have two pumps,I guess you know that ,if you already did one. Did you check fuel pressure at the rail and check out the electronic pressure regulator? What codes are coming up and do they stay set?
well the first part of your question i was all ready to tell you to put a new fuel pump in, now not so sure, there is a relay for fuel pump, can you hear pump cycle and relay click? relay under hood you will have to listen close they don't run long maybe a couple secounds, if you don't relay bad. if you do pump could be bad, do fuel pressure test pump could be weak. don't think sunroof and turn signals are related, but stranger things have happend.
Sounds like it could be a number of things Coil breaking down,ignition module breaking down or a failing relay.Could be ignition relay or fuel pump relay.The relay is the quickest,easiest and cheapest option to try first.