Fuel Pump? - JeepForum.com
 
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post #1 of 7 Old 03-13-2017, 10:40 AM Thread Starter
JBlue
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Location: Westchester
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Fuel Pump?

Quick question guys as I tried to run out for lunch and the jeep won't start. debating about it having towed home or towed to the shop.

Symptoms?
Jeep won't start. No CEL code - I even carry my scanner on me. Battery is good. It cranks. But it seems there's a fuel issue as it is cranking but the spark isn't happening. When I put my foot on the gas all the way down, the engine will start to turn but make an almost cough sound and is incredibly rough and then die out.

Background
Three years ago when replacing the engine, the crank sensor and O2 sensors were replaced. A year before that, the starter/battery was replaced so everything should be OK.

Thoughts?

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post #2 of 7 Old 03-13-2017, 10:48 AM
tjwalker
It's the crank sensor!
 
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I usually verify spark, then fuel....but as it is a little bit harder with an 00-01 and the coil rail, I'd start with fuel. Get your mitts on a fuel pressure gauge. You need approximately 49 psi, plus or minus 5 psi for the engine to start.

Good luck and keep us updated!

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post #3 of 7 Old 03-13-2017, 10:50 AM Thread Starter
JBlue
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Thanks, TJ - Your help is always appreciated. I'm stuck at work and I'm guessing I'll tow it home and check it all myself. I literally filled up my tank today and it would suck if its the pump.

Edit: I should mention I put in new fuel injectors during the engine rebuild 3 years ago and new plugs 4 years ago.
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post #4 of 7 Old 03-14-2017, 03:32 AM
BagusJeep
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When you first turn the key can you hear the pump energizing and building pressure? If not, possible electrical fault but if it starts and runs like a whippet with colic, pump is not doing its job

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post #5 of 7 Old 04-17-2017, 08:06 AM Thread Starter
JBlue
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Update: I here the fuel pump engage and my pressure is about 42. Still no codes. Again, when I turn the key, it cranks but doesn't start. I created my first youtube video below to see if anyone has an idea. The second part is when I floor the peddle, I'm getting desperate, any ideas?

https://youtu.be/hH7c2mMoflo
Attached Thumbnails
IMG_3261.jpg  
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post #6 of 7 Old 04-17-2017, 08:15 AM
CJ7-Tim
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Load Test the battery and clean/snug all of the battery starter and PCM grounds. Having to depress the gas pedal to get the engine to start, with rough running and no idle very strongly suggests that the PCM is re-booting from low voltage.


For 1996+ Jeeps, the OBD-II engine computer (ECU/PCM) re-boots, and the idle settings are deleted, when you: (1) let the battery run down by leaving the lights or radio on, (2) disconnect the battery for an extended period of time, (3) when the battery goes bad and needs replacing, (4) when the alternator is not properly charging the battery, (5) or when poor battery connections result in a voltage drop at the PCM or poor battery charging. Loose, corroded, or damaged battery cables or ground wires may also cause or contribute to the problem.

A faulty Coolant Temperature Sensor may also cause similar symptoms. Testing of the CTS is recommended as part of the diagnostics. A poor ground at the ignition coil can also cause similar symptoms.

The reboot symptoms are: (1) having difficulties starting the engine without depressing the gas pedal, and (2) the engine will have a low idle and probably stall unless you keep your foot on the gas pedal. (3) The ECU will usually relearn the idle settings after a short period of driving and the engine will start and idle normally.

Begin with basic trouble shooting of the start and charge systems. Remove, clean, and firmly reconnect all the wires and cables to the battery, starter, and alternator. Look for corroded or damaged cables or connectors and replace as needed. Copper wires should be copper color, not black or green. Do the same for the grounding wires from the starter to engine block, the ground wires at the coil, and the ground wires from the battery and engine to the Jeep's frame/body. You must remove, scrape, and clean until shiny, the cable/wire ends, and whatever they bolt to. Jeeps do not tolerate low voltage, bad connections, or poor grounds.

If the symptoms reoccur, you need to have your battery and/or the alternator Load Tested at a repair shop or auto parts store. This is usually a free service they offer to bring in potential customers. Handheld testers are very inaccurate and will usually pass marginal alternators. Even with low battery voltage, the engine will start, but the ECU can re-boot multiple times and a new battery may be required.


Cleaning the Idle Air Controller (IAC),regular tune-ups, and using fuel injector cleaner should be part of your routine preventative maintenance for smooth starts.

.

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post #7 of 7 Old 04-17-2017, 01:33 PM Thread Starter
JBlue
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Quote:
Originally Posted by CJ7-Tim View Post
Load Test the battery and clean/snug all of the battery starter and PCM grounds. Having to depress the gas pedal to get the engine to start, with rough running and no idle very strongly suggests that the PCM is re-booting from low voltage.


For 1996+ Jeeps, the OBD-II engine computer (ECU/PCM) re-boots, and the idle settings are deleted, when you: (1) let the battery run down by leaving the lights or radio on, (2) disconnect the battery for an extended period of time, (3) when the battery goes bad and needs replacing, (4) when the alternator is not properly charging the battery, (5) or when poor battery connections result in a voltage drop at the PCM or poor battery charging. Loose, corroded, or damaged battery cables or ground wires may also cause or contribute to the problem.

A faulty Coolant Temperature Sensor may also cause similar symptoms. Testing of the CTS is recommended as part of the diagnostics. A poor ground at the ignition coil can also cause similar symptoms.

The reboot symptoms are: (1) having difficulties starting the engine without depressing the gas pedal, and (2) the engine will have a low idle and probably stall unless you keep your foot on the gas pedal. (3) The ECU will usually relearn the idle settings after a short period of driving and the engine will start and idle normally.

Begin with basic trouble shooting of the start and charge systems. Remove, clean, and firmly reconnect all the wires and cables to the battery, starter, and alternator. Look for corroded or damaged cables or connectors and replace as needed. Copper wires should be copper color, not black or green. Do the same for the grounding wires from the starter to engine block, the ground wires at the coil, and the ground wires from the battery and engine to the Jeep's frame/body. You must remove, scrape, and clean until shiny, the cable/wire ends, and whatever they bolt to. Jeeps do not tolerate low voltage, bad connections, or poor grounds.

If the symptoms reoccur, you need to have your battery and/or the alternator Load Tested at a repair shop or auto parts store. This is usually a free service they offer to bring in potential customers. Handheld testers are very inaccurate and will usually pass marginal alternators. Even with low battery voltage, the engine will start, but the ECU can re-boot multiple times and a new battery may be required.


Cleaning the Idle Air Controller (IAC),regular tune-ups, and using fuel injector cleaner should be part of your routine preventative maintenance for smooth starts.
CJ, you magnificent bastard. I cleaned up the battery and the four visible ground on the block and it started like a prop plane but then settled down. I did do the headlamp upgrade a few months back. Could this be related? Perhaps the battery terminals were dirty from when I was working on this? Odd problem, it was running fantastic before this hiccup. Thanks again. Hopefully, that's it. John
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