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post #1 of (permalink) Old 05-08-2007, 06:47 AM Thread Starter
 
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Possible reasons for my YJ 4 cyl not starting

Ok so I cleaned my throttle body last night. It was incredibly dirty. It will start with a shot of starter fluid and it's fine.

If i go to the store for an hour and come out it starts but if im at work I need to use the starter fluid again. I am going to get injector cleaner for the gas tank, and pray that it helps.

What I find baffling is that it starts with the fluid and stays running so its obviously getting gas.

Any ideas becasue I cant go to my office looking like a grease monkey every morning.

By the way I LOVE MY JEEP!!!!

Thanks in advance.
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post #2 of (permalink) Old 05-08-2007, 10:52 AM
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Did you take the TB off or loosen the fuel line?
What I'm thinking is a very slight leak on the fuel connection to the TB.
Fuel is thicker than air, so you may not see any fuel leak but air can get in.
When you let it sit a long time the fuel drains back to the tank - replaced by the air. When you turn the key on the pump runs only a short time, then shuts off until it starts - not quite long enough to get fuel all the way back up from the tank.

Try turning the key on - wait 10 seconds, turn it off again and then try starting it. That gives the pump two shots to get the fuel up. If it starts then --.
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post #3 of (permalink) Old 05-08-2007, 11:32 AM Thread Starter
 
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I have not done anything to it as of yet

just cleaned it last night. I will try your suggestion today at lunch. I appreciate the input and will let you know what happens.


Thanks.
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post #4 of (permalink) Old 05-08-2007, 12:58 PM Thread Starter
 
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Ugh

No luck I had such high hopes. Thats why they have mechanics lol.

Thanks for the input.
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post #5 of (permalink) Old 05-08-2007, 04:43 PM
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I think RRich is headed in the right direction....especially if a squirt of starter fluid gets it going.....

Ok..do this...turn on the key and listen to see if you hear the fuel pump...you should hear it run for about 2 seconds and then shut off.

I'm not sure exactly how the Jeep FI is setup up...but I wouldn't be surprised if it's very similar to my SBC TBI.

The computer will NOT run the fuel pump with the ignition on but the engine not running. This is why the two second run and then stop. This is to prevent the pump from dumping gas out in the event of an accident where the engine quits but the ign is still on. That is the reason for the 2 seconds...it primes the line.

But the fuel pump 'should' run when you have the either the crank signal or running signal. When you squirt the starter fluid in there, you are giving the engine enough juice to start up...which gives you the run signal which in turn starts the pump....but then again, I could be wrong.

Listen for the fuel pump. In fact, try RRich's suggestion about 5 times in a row to see if that helps.

Next, with the engine off, take off the cap for the fuel rail (looks just like an valve stem on a tire) and press the valve pin...gas should spray out pretty hard for a moment (press should be about 40 PSI).

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post #6 of (permalink) Old 05-08-2007, 06:05 PM
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Maybe the Jeep is trying to tell you something...so I say stop going to work...problem solved Double check everything that you disconnected. It's most likely something simple.
John

Please send check or money order for my bigger engine, drivetrain, axle, and tire foundation directly to me
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post #7 of (permalink) Old 05-10-2007, 06:59 PM Thread Starter
 
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Ok so I took the beast to the shop.

The guy basically took the throttle body apart and soaked and cleaned it. IT STARTS with the first key turn! I am happy!

Thanks for all your help!
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