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Ask Jared D Your Own Question
Jared D
Jared D, ASE Certified Technician
Category: Jeep
Satisfied Customers: 1666
Experience:  Shop Supervisor at County Fleet
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Came home shut off jeep. 10 minutes later wont start..no

Customer Question

came home shut off jeep. 10 minutes later wont start..no sperk
JA: What is the model/year of your Jeep?
Customer: 2002 jeep liberty sport 3.7l
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: month ago had engine codes said either cam or crank sensor..changed crank sensor ran good for month.. so today changed cam sensor still no spark
JA: Have you scanned the code? Have you tried to reset it?
Customer: back then yes,,no code now
JA: Anything else you think the mechanic should know?
Customer: no car was running dood till shut it off..then no start 10 minutes later
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Jeep Mechanic about your situation and then connect you two.
Submitted: 10 months ago.
Category: Jeep
Expert:  Jared D replied 10 months ago.

To clarify, it will crank but won't start or does it just do nothing at all?

You have tested for spark?

Can you hear the fuel pump buzz when you first turn the key to the run position?

Customer: replied 10 months ago.
it cranks i smell fuel no spark
Customer: replied 10 months ago.
i used a timing light on wires going to coil over plug
Customer: replied 10 months ago.
where is the fuel pump buzz back in tank or by motor
Expert:  Jared D replied 10 months ago.

You should hear the buzz back by the fuel filler neck.

Customer: replied 10 months ago.
there is a buzz
Expert:  Jared D replied 10 months ago.

That's good- the fuel pump is ok.

Check fuse #26 in the under hood fuse box and make sure it's not blown or loose.

If it looks ok pull the auto-shutdown relay in the under hood relay box and swap it with something else that uses the same size relay or with a new one-

If it still won't run then you will need a scope to check for a cam position signal and crank position signal.

You could also pull the oil cap or valve cover and then have someone else crank the engine and see if the cams are rotating.

Expert:  Jared D replied 10 months ago.

I'm sorry, fuse #6 not #26.

Customer: replied 10 months ago.
Is 6 labeled..how do i lnow which one it is
Expert:  Jared D replied 10 months ago.

Correction, it looks like 6 and 26 both feed power to that circuit. Let me see if I can get a diagram of the fuse box lid. It should be labeled, but sometimes they are hard to read.

Expert:  Jared D replied 10 months ago.

Here are the fuses. If your jeep still has that spare relay next to the auto shut-down relay you can swap it in and see if it will run.

Customer: replied 10 months ago.
checked all fuses all good..changed relay still no spark. oil cap cant see down tube now what should i do
Expert:  Jared D replied 10 months ago.

When you crank the engine does it sound like a fast unusual crank or does it sound fairly normal?

You will need a scan tool to see if you are getting a signal from the cam and crank sensors.- The engine uses those signals to tell when to spark.

Customer: replied 10 months ago.
Engine sounds normal..I have a scan tool actron auto scanner plus cp9180...will that work or what do I need
Expert:  Jared D replied 10 months ago.

If your scanner will show RPM data, crank the engine while watching for RPM data. If you don't see RPM while cranking then the sensor with no RPM signal on the data stream is bad.

Expert:  Jared D replied 10 months ago.

Hi,

I just wanted to check and see if you need any additional info.