2020 Grand Chekokee Cranking

Question

My jeep randomly Cranks at first but then after the car starts. My battery is normal; I am not hearing any unusual noise from the gas tank. The fuse box looks normal and is well-connected. Would using the 505 CRF Fuel System Treatment be a good idea? The car has 89k miles

Chuck Tobias · Accepted Answer

[quote data-userid="180220830" data-postid="333553"] My jeep randomly Cranks at first but then after the car starts. [/quote] It's hard to tell what's going on here. Does your Jeep just crank all by itself at random? Does it fail to crank sometimes? What is the meaning of "but then after the car starts"? Are you saying that the car starts if the engine cranks? Or, is there something that happens after the engine starts? [quote data-userid="180220830" data-postid="333553"] My battery is normal [/quote] Did you test it? How old is it? [quote data-userid="180220830" data-postid="333553"] I am not hearing any unusual noise from the gas tank. [/quote] Gas tanks are not known for making noise unless a fuel pump is noisy. However if a fuel pump is dead that won't make any noise either. [quote data-userid="180220830" data-postid="333553"] The fuse box looks normal and is well-connected. [/quote] You can't tell much about a fuse box by just looking at it. Are your battery cables tight and in good condition? [quote data-userid="180220830" data-postid="333553"] Would using the 505 CRF Fuel System Treatment be a good idea? [/quote] Are you experiencing any symptoms consistent with dirty fuel injectors?

anthonyrizzo · Answer

The cranking just happens whenever it wants to. The cranking lasts about 5 seconds, I believe, and fails to start. On the second try, the car starts.

Battery - I went to Auto Zone and they stated the battery passed. State of charge is 75%, rated CCa is 750, cranking health Pass, reserve capacity Ok. The battery is 5 years old when I first bought the car in 2020

Fuse Box, I don't see any loose screws, but I will double-check.

Dirty fuel injectors - I had a look at how to access the injectors. It's a lot of work for me to gain access, which I don't feel comfortable doing yet, since my daughter needs the car HAHAHAHA!!

Chuck Tobias · Answer

[quote data-userid="180220830" data-postid="333558"] The cranking just happens whenever it wants to. [/quote] Sounds like a deep-seated electrical problem. Jeeps are notorious for that kind of thing. [quote data-userid="180220830" data-postid="333558"] The battery is 5 years old when I first bought the car in 2020 [/quote] At that age it is suspect regardless of the AutoZone test. Undercharged by 25% could affect operation of computer modules. Both the battery and alternator should be load-tested together. Battery terminals and cables should be checked as well. It's also possible you have a relay problem, but there you're getting into dealing with the dreaded TIPM. [quote data-userid="180220830" data-postid="333558"] Fuse Box, I don't see any loose screws, but I will double-check. [/quote] What would loose screws have to do with anything? [quote data-userid="180220830" data-postid="333558"] Dirty fuel injectors - I had a look at how to access the injectors. [/quote] Fuel injectors would not cause random operation of the starter. If it's not something simple like battery or alternator or a problem with battery terminals or cables you'll need to have your starting system diagnosed with a fancy bidirectional scan tool.