Next thing ill try is, unplug or remove fuse from fuel pump and try to start on ether (starting fluid). If the engin will run on starting fluid, than gas is contaminated.
If not, there must be electrical issue... because engine stall so fast, i dont think, there is vacuum problem.
Some of your conclusion is whacky. Leave the fuse in. The starting fuel running engine for longer even when pump SHOULD be running is further proof of bad fuel supply as in the amount and pressure.
'If the engin will run on starting fluid, than gas is contaminated.'
That has several things wrong with it. Why you grill the son, diesel didn't get there by accident, he would know, the gas cap is locked to not be messed with. You can smell diesel in normal gasoline. Fouled plugs ARE an electrical issue but not one you chase wiring with, and they can make that start to quickly stop symptom all day long.
Having the fuel pump fuse in place also lets the ether run the engine possibly long enough to somewhat unfoul the plugs and then regular fuel supply kicks in to take over and engine stumbles around for a bit then begins to clear out and run better if all that is wrong is heavily fouled out plugs. Fuse out it doesn't happen. The ether is used to not only start the engine but keep it running long enough the fouling burns out during it.
You should be aware that modern MPFI cars now are harder to light off with starting fluid and the explosion risk is MUCH higher as a result too. The older cars had much smaller intake manifold volumes that required much less ether to light off the engine, now they are much bigger due to the manifolds only carrying air and not fuel. The normal 2 second MAX ether shot that would start an older car is usually not enough and you must use a much bigger shot to cover the increased air volume there and then the explosion risk goes way up. Even more so if you do NOT pull the plugs to look at them to see if they are WET. When wet they short down the side of the insulators and why the engine pops off to run for a second then dies, the cylinders are too rich. The shorting spark is not hot enough and then produces a weak partial only ignition of the mixture that burns slow as a result to let the engine backfire into the intake and normal for fouled plugs to do that all day long. Except for the fact that the intake is now full of ether. What happens next? The intake explodes and possibly into many pieces, seen it more than once. Can easily kill somebody.
Why slow methodical absolutely correct thinking in proper order needs to take place whenever using ether. BTDT. Those problems did not exist on the older cars unless an idiot was working on them. No insult intended there at all of course, just that safety is always more important than whether the car gets running.
Make ABSOLUTELY sure the plugs (ALL) are BONE DRY before using ether there. If they already are dry you likely still have a fuel supply issue if you have already been trying to start it for a while.
Engine now starts and run, but idle goes up and down... about 1100 to 2000 rpm...
Wetted plugs can do that.
You may have fixed nothing, you don't say and making it not really an update.
A car that won't crank often does days later, that does not mean they have fixed themselves.
Actually, i went away for few weeks and since i came back, car starts every time but with rpms going up and down...
What i did so far;
Checked lines for cracks and possible vacuum leak
Reconnect ECU harness, TPS, MAP and MAF sensor, O2 pre cat sensor, temperature sensor, crank shaft sensor and any possible connectors i could see...
I cleaned throttle body
Checked PCV valve
Checked ground from battery to the engine
My next step;
Just ordered OEM spark plugs, intake and throttle body gaskets.
BTW. All this happened about month or two after tune up (from some local shop)
Edited; i was reading somewhere, that over tightened intake manifold and throttle body can cause some leaks and floating RPMs. 20ft lbs for manifold and 89ft lbs for TB...
Now that you clarified a bit more..............the car wouldn't start because the plugs were wet, with time the wet evaporated but not ever 100% so the car starts later but has a faulty idle as the plugs are still fouled, they convert from a wetfoul to dryfoul as the fuel then carbons up the side of plug with a now dry deposit that then shorts out the same way as before but not bad enough so that it now starts but does not idle right.
New plugs will cure the idle if that is all that is now wrong. If still doing it then vacuum leak likely.
Old plugs coming out dark verify what I said about plugs. You can clean old to work like new again but needs to glassbead to do it, no washing on earth will clean that deposit off the porcelain.
If you have access to realworld OBD live data the first O2 will be hanging low at idle when the engine is doing the lumpy idle, the sensor not going over .5 volt is a lean indicator of a vacuum leak.
Today i replaced spark plugs and intake gasket kit. Also cleaned TB.
Engine start right up and was running just perfect.
I did several restarts and all was working as expected.
Then, i did TB relearn and right after all done, engine start acting weird again....
RPM running up and down....
Here is the video how to relearn: https://youtu.be/CR-AjHCslhs
You do not have much to loose if you disconnect a negative battery connector for a few minutes.
Got it run!
90% of TB relearning videos are useless !
This is how i did it:
Turn ignition ON for 2 sec, turn OFF for 10. Than do it again, 2 sec ON, than OFF 10 sec.
1, let vehicle turned OFF for at least 10 sec
2, turn ignition ON and count 3 sec
3, right after depress accelerator pedal 5 times (in 5 sec)
4, count 7 sec and than press accelerator and hold it.
5, while holding, watch Check engine light. Should flash several times and than start flashing quicker. Still hold the pedal until solid Check engine light and start the engine in 3 sec.
Car start right up. RPM was going up and down for about 10-15 sec, than got back to normal idle (about 750rpm).
Turn the engine and have a glass of vine 😂
Disconnect the battery and avoid all that monkey-motion. Does the same thing.
You lost me when you said you had car running perfectly to then try to relearn idle and why? I have never needed to relearn idle yet on mine. You had a car idling fine then you tell the ECM to relearn, it then substitutes the last running circumstance assuming it was good and yours was a bad idle so bad idle got substituted instead.
One has to be smarter than the machine.
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