Auto Repair - Roadshow forum

Question

97 jeep grand cherokee limited 5.2L v8 crank but won't start

by Jamielee85 / December 21, 2017 10:33 AM PST

The jeep started last year. When i went back to fix the no oil pressure problem it will crank but won't start. Have replaced the ignition coil crank sensor and the oil pressure sensor. Fuel pump kicks on when I turn the key, it has gas. None of my gages are working. All fuses in dude boxes good. Where do I go next. I'm a single mom in need of help lol

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Clarification Request
check for a second fuse block
by James Denison / December 21, 2017 1:00 PM PST

Also make sure the battery is fully charged. Also clean the battery cables as they may have scale that causes electrical resistance, so sometimes low power can make it through, but when the more power is needed, it fails. Commonly called "clean the battery cables".

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Battery cables
by Jamielee85 / December 21, 2017 7:39 PM PST

Purchased new battery and new terminals still nothing.

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Let's make it very simple
by James Denison / December 22, 2017 2:00 AM PST
In reply to: Battery cables

3 things must happen for an engine to run. Fuel, air, and spark. If any of those are missing it won't crank. If the timing was off a bit, then you'd get backfires or blow back through the manifold. I looked and that has fuel injectors, not a carburetor nor Throttle Body Injector (a large single injector where a carburetor used to be on some 80 models). So, how do you KNOW it's actually getting any gas? You can test that theory by putting a little gasoline in the manifold intake and then crank it. If it starts to run and then dies out, you KNOW it's not getting gas through the injectors. Use about a 1/4 cup of gasoline when you put it in, then crank.

All Answers

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Answer
No start Jeep
by landdchamp Forum moderator / December 21, 2017 3:49 PM PST

Hi, Jamie; James is 100% correct. One of my computer trainers said the first three things you check is: Battery, battery, and battery. Too many times, he's been correct. Although you can hear the fuel pump run, is it actually delivering fuel to the injectors? A fuel pressure test would be in order. Are the injectors getting a signal? A noid light would answer that question. Are you getting spark during cranking? A spark tester would answer that. Do you have a check engine light when the key is on?
Are there any codes stored? So many questions, and no firm answers. I'm sorry, but this will require some diagnostics to get to the bottom of this. If you have any answers to my questions, please, feel free to let us know.
Good luck.
Loren

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