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I have a 07 seven Jeep Commander, We have change the fuel

Customer Question
I have a 07 seven...
I have a 07 seven Jeep Commander
JA: Are you fixing your Commander yourself? What have you tried so far?
Customer: We have change the fuel pump and
JA: Have you ever replaced the fuel pump, or is this the original?
Customer: Just replaced it
JA: Anything else you want the mechanic to know before I connect you?
Customer: They said the coil pack needs to be replaced. Will that not make it crank st all. It's turn turning over. What does it sound like when timing jumps
Submitted: 10 months ago.Category: Jeep
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Answered in 3 minutes by:
1/4/2017
Jeep Mechanic: Chris, Shop Foreman replied 10 months ago
Chris
Chris, Shop Foreman
Category: Jeep
Satisfied Customers: 13,974
Experience: Jeep Certified Master Tech
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Hello, my name is ***** ***** I will assist you today. A failing coil pack would not cause a no crank. It could cause a crank crank crank crank crank crank, but not start. So do you have an actual no crank, or a crank and no start?

Chris

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Customer reply replied 10 months ago
We have a crank but no start what do you mean by a crank
Customer reply replied 10 months ago
Is getting fuel but no start
Jeep Mechanic: Chris, Shop Foreman replied 10 months ago

I mean when you turn the key to the start position and the starter turns the engine over, but the engine does not fire up.

Chris

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Customer reply replied 10 months ago
That's what it's doing
Jeep Mechanic: Chris, Shop Foreman replied 10 months ago

Ok, got it. Tell me did it just shut down one day and not start anymore or did it just not start one day?

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Customer reply replied 10 months ago
I bought it off of somebody they said that the fuel pump needed to be change in the cold pack we did both of those now we can't get a hold of the guy that we bought the truck from and we're confused and we need help
Jeep Mechanic: Chris, Shop Foreman replied 10 months ago

Ok, you may have a failed PCM (engine computer) or the PCM is not being powered up. Do you have access to a scan tool or code reader?

Chris

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Customer reply replied 10 months ago
No I don't have access to one
Customer reply replied 10 months ago
How do I find out if it's it. What bout the starter relay?
Jeep Mechanic: Chris, Shop Foreman replied 10 months ago

If it was the starter relay, it would not even crank when you turned the key to the start position.

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Customer reply replied 10 months ago
The guy bought truck from said the code reader was reading coil pack
Jeep Mechanic: Chris, Shop Foreman replied 10 months ago

Does the tachometer move up at all when you crank it?

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Customer reply replied 10 months ago
No
Customer reply replied 10 months ago
Well maybe
Jeep Mechanic: Chris, Shop Foreman replied 10 months ago

When you turn the key on to the run(not start) position, can you hear the faint whirring sound of the fuel pump come on for about 2 seconds and then shut off?

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Jeep Mechanic: Chris, Shop Foreman replied 10 months ago

The reason I asked tat last question is because the PCM controls the fuel pump through the fuel pump relay. So iut helps me to know if the pump runs or not.

Chris

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Customer reply replied 10 months ago
It does
Customer reply replied 10 months ago
No the tack meter doesn't move. It acts like it does
Jeep Mechanic: Chris, Shop Foreman replied 10 months ago

Ok then the PCM must be somewhat ok. Knowing that, I am thinking you may have a failed cam or crank sensor. Especially since the pump runs, but the tach does not move. Which engine do you have in the Jeep?

Chris

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Customer reply replied 10 months ago
3.7
Customer reply replied 10 months ago
Is the internal ?
Jeep Mechanic: Chris, Shop Foreman replied 10 months ago

Ok. At this point I am recommending that you rent a scan tool to check and see if the PCM is getting a valid signal from the cam and crank sensors. If one is not sending a signal, then replace BOTH. I see many times where one sensor can pull te other one down and cause a no start. See if you can rent a scan tool from your auto parts store and check this.

Chris

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Customer reply replied 10 months ago
Ok hold on a min
Jeep Mechanic: Chris, Shop Foreman replied 10 months ago

Ok

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Customer reply replied 10 months ago
Ok I'm back
Customer reply replied 10 months ago
Ok so can it be internal
Customer reply replied 10 months ago
is it a major fix on those?
Jeep Mechanic: Chris, Shop Foreman replied 10 months ago

It could be internal engine problems, but not common. If it is a cam or crank sensor, they are not a major fix. About 1.5 hours or less to replace them.

Chris

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Customer reply replied 10 months ago
Ok so when your cranking it. It turns and turns but doesn't fire
Customer reply replied 10 months ago
Like it makes a weird whining
Jeep Mechanic: Chris, Shop Foreman replied 10 months ago

A weird whinning sound? Hmmm, have you performed a cyinder compression test yet? If not let's do that next to check the general health of the engine.

Chris

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Customer reply replied 10 months ago
Like it sounds like it wants to fire but it stays on the whining noise
Customer reply replied 10 months ago
No I haven't done one. Does that sound real bad.
Jeep Mechanic: Chris, Shop Foreman replied 10 months ago

Maybe. Since I cannot actually here it , hard to say, but if it does not sound like a normal cranking sound, then you may have an internal engine problem like timing chain, blown head gasket due to severe overheating, etc. Do a compression test on all 6 cylinders and then we can go from there.

Chris

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Customer reply replied 10 months ago
Ok
Jeep Mechanic: Chris, Shop Foreman replied 10 months ago

I will keep an eye out for your test results.

Chris

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Chris
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