Won't fire up in the morning...help - JeepForum.com
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post #1 of 20 Old 09-29-2017, 01:05 PM Thread Starter
Mungazika
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Won't fire up in the morning...help

Anyone have any ideas as to why my 98' 2.5L bone stock TJ will not start in the morning around 0700 to take kids to school...but it will start around 0930 when I get back home and run and start fine the rest of the day...? Located in a tropical climate.

Swapped out the coil and the cps. Symptoms remain the same.

Tried again this morning. I can hear the fuel pump kick on when I turn the key. It's getting gas cuz if feathered it'll putter a little bit and puff lil smoke out the pipe but not fire up.


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Last edited by Mungazika; 09-30-2017 at 01:23 PM.
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post #2 of 20 Old 09-29-2017, 01:40 PM
mukluk
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Is the Jeep throwing any codes?
When is the last time the ignition system had any sort of a tune up?
Does turning the key on and off several times prior to cranking make any difference to its starting ability?

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post #3 of 20 Old 09-29-2017, 02:13 PM
Jerry Bransford
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As suggested above by Mukluk, try this tomorrow morning. Turn the ignition switch on-off-on 6-7 times in a row, pausing in the On position each time until the fuel pump shuts off automatically then do it again. After doing that 6-7 times, then try starting it. If it then starts right up, that means the fuel is leaking out of the fuel rail past a leaky check valve and back down into the gas tank. The additional time it is taking to start is how long it takes for the fuel pump to get fuel all the way back up to the fuel rail where the fuel injectors are. Replace the fuel pump/fuel pressure regulator assembly if the above procedure gives you a quick start.

This is the one to go with... https://www.amazon.com/Bosch-67655-O...+1998+wrangler

Avoid store brands or online brands like Airtex or Spectre. Those don't last long enough to warrant installing them if you plan to keep your Jeep for a while.

When you have a choice, buy American made.
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post #4 of 20 Old 09-29-2017, 03:12 PM
Jonny Jeep
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Since you've said you're in a tropical climate the Amazon pump that Jerry linked may or may not be available to you. You could also look at http://www.rockauto.com they sometimes have the Bosch pumps in stock.
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post #5 of 20 Old 09-29-2017, 05:10 PM Thread Starter
Mungazika
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I will give it a shot and try that tomorrow morning. Thank you.

Also there are no codes being thrown.


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post #6 of 20 Old 09-30-2017, 01:21 PM Thread Starter
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Same thing this morning. Tried the on off on off pausing in the on. Same thing. Wonít fire. Came back from dropping kids off and it fires right up. Stumbled a lil bit at startup then ran smooth immediately after....Iím stumped.


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post #7 of 20 Old 09-30-2017, 01:26 PM Thread Starter
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post #8 of 20 Old 09-30-2017, 01:27 PM
Jerry Bransford
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Quote:
Originally Posted by Mungazika View Post
Same thing this morning. Tried the on off on off pausing in the on. Same thing. Wonít fire. Came back from dropping kids off and it fires right up. Stumbled a lil bit at startup then ran smooth immediately after....Iím stumped.
6-7 times usually does it but my previous fuel pump, a Spectre, got so bad that I had to cycle it a dozen times before it would start reliably. Try cycling it on-off-on a dozen times tomorrow morning. I haven't had that problem in 7-8 years since replacing the Spectre pump with a Bosch.

When you have a choice, buy American made.
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post #9 of 20 Old 09-30-2017, 02:20 PM Thread Starter
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Ok. Iíll give it a shot tomorrow. Thank you


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post #10 of 20 Old 09-30-2017, 04:35 PM
mukluk
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Remove your distributor cap and look for evidence of arcing inside the cap or fouling/buildup on the rotor or cap contacts -- scrape any contact fouling from the contacts, sand or file the rotor contact so that it's clean and shiny, and wipe the inside of the cap out with a clean and dry paper towel. Also, try starting your Jeep up after the sun goes down and observe the engine running in the dark, no lights, to see if you have any arcing from the spark plug wires.

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post #11 of 20 Old 09-30-2017, 06:02 PM Thread Starter
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My location is Hawaii so itís 1400 here right now.
Will do and post back with results.
Thank you.


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post #12 of 20 Old 10-01-2017, 11:54 AM Thread Starter
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Won't fire up in the morning...help

Had a terrible migraine last night so I didnít get around to seeing anything in the dark.

This morning even with a dozen + key cycles it still just cranks and cranks but will not fire up.
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post #13 of 20 Old 10-01-2017, 02:31 PM
Jerry Bransford
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Quote:
Originally Posted by Mungazika View Post
Had a terrible migraine last night so I didnít get around to seeing anything in the dark.

This morning even with a dozen + key cycles it still just cranks and cranks but will not fire up.
Step 2. Connect a rented/borrowed fuel pressure gauge to the Schrader valve on the fuel rail and see what kind of fuel pressure is there before and after you cycle the ignition on-off-on multiple times. Most auto parts stores like Autozone loan them out for free. I am leaning toward your fuel pump being so bad/totally bad so it is no longer pumping fuel even with multiple on-off-on cycles. The pressure at your fuel rail is supposed to be at or very close to 49 psi.

When you have a choice, buy American made.
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post #14 of 20 Old 10-01-2017, 03:06 PM Thread Starter
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But the Jeep runs and fires up fine at around 0930-1000 and fine all day long start stop etc..
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post #15 of 20 Old 10-01-2017, 03:07 PM Thread Starter
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Won't fire up in the morning...help

It just wonít start from maybe some condensation or the warmth from the sun somehow warms up or dries out something ...idk. Lol
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