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ive posted about this before my jeep wrangler has been randomly stalling upon start up it will start then it will begin to die and 100% of the time if i catch it before the RPMs drop to low to can feather the throttle and bring the RPMs up to about 2500 then i can release the throttle and it will idle and run just fine but when i dont catch it, it will die then it wont start up again for about 10 mins
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If your fuel pressure regulator does not provide answers, and is working properly, check the fuel delivery system. If you are showing low pressure, that could be as simple as a fuel filter or fuel pump. However, this sounds more like an intake vacuum leak to me. Check around the intake manifold gasket, EGR system, and the Intake as a whole. Also, it may not hurt to replace the O2 sensors and check the catalytic converter which may be restricting exhaust.
Eric made a video for checking vacuum leaks,
http://www.youtube.com/watch?v=9CPqbaSgcokA+ on vacuum leaks and fuel. also look at the IAC idle air control. if you can tap on it with the handle of a screw driver to see
if the idle changes. if it does than the part is suspect and should be changed. C8-)+1 with the above post.
The next time it does not start, you need to see if you are missing spark or fuel.
I would defiantly recommend a fuel pressure test. You could have an issue with your ECT, fuel pressure regulator or fuel pump check valve.
Eric’s
Yea you would need to check fuel pressure to determine if that is an issue when the problem occurs, you can also check the fuel psi regulator by removing the vacuum line and observing the pressure at idle, it should rise a few pounds when you do this and go back down when you reconnect it. I also recommend checking for vacuum leaks as they are the most common cause of performance issues like yours. Keep us posted on your progress.
i replaced the fuel pressure regulator it still has the problem, so i looked at the vacuum hose and the rubber piece that connects to the FPR was rotted to pieces so i replaced that hopefully that does it but i will not know until i go to work because this problem only happens at work when i dont have time to test it but it wont happen no matter how hard i try when its in the gargage and i have plenty of time :p
alright i did some more testing annnnnnnnnnnnnnnnnnnnnnnnnnnd (drum roll) i found out after i drive it and get it to temp if i park it and let it sit for 1-5 mins it will fire right back up but if i let it sit for about 20-30 it will do its thing where it stalls and wont start until it sits for awhile soo im 90% sure its flooding, i have tried using the “clear flood” mode but i dont have one if i how the pedal down all the way it will still start then rev really high cause the pedal is pressed so what i did was brought it to temp let and sit then stated it so it would die then i quickly pulled the plugs to see if they were wet and they were bone dry, but takeing them out and putting them back in took aout 10 mins and once i did it fired right back up without having to sit for awhile so im thinking leaking injector(s) so i bought all new injectors and am replacing them tomorrow and see if that works if it doesnt im going to set it on fire and roll it in a ditch
Uh, did you ever test the fuel pressure as suggested? I doubt that replacing the injectors will fix your problem. If you say all the plugs were dry, then the injectors aren’t leaking. I’m guessing they weren’t cheap either. If you do some of the diagnostics suggested, you probably wouldn’t have bought the injectors in the first place, and you won’t have to set your jeep on fire. In fact, if that’s your plan, I could use a Jeep.
If all the plugs were dry than fuel is the issue. to confirm you need to test your fuel pressure. also if theres a fuel filter check that first.C8-)
no lol im not really setting it on fire its my baby but i planned on replacing the injectors anyway but if the injectors dont fix it then ill replace the fuel pump cause theres nothing else it could be i do have spark when it dies the plugs, wires , cap and rotor are new the FPG is new i checked all the vacuum hoses all connections are tight and new i test them the way eric showed in his vids, i dont have o2 senors i have new fuel filter all the fuel lines are good with no rust soo if the injectors dont fix it then im lost
You dont have o2 sensors? Then how is your PCM adjusting the fuel ratio when your in closed loop?
I really dont see the point in wasting money on parts without testing them.
ok well i found out i DO have an o2 sensor i just didnt see it when i first looked but the injectors are in with no leaks and ill try them out tomorrow but its a 1995 2.5 L and i know its doesnt make sense to throw parts at it but i planned on replacing all these parts anyway
Quoted From jeepguy:
if the injectors dont fix it then ill replace the fuel pump cause theres nothing else it could be
There’s plenty of things it could be. You really need to test the fuel pressure. When you turn the key to the ‘on’ position, can you here the fuel pump run? If not, start with the basics. Check the fuses. Try swapping the fuel pump relay with a known good relay. Then you would want to test the wiring to the fuel pump. I would put money on the injectors not being the fix by the way.
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