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  #1  
Old 09-19-2011, 08:47 PM
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WK Starting Issue

2005 Grand Cherokee 5.7 with 59k miles.

Having issues with the vehicle starting.
The starter and everything seems to be working fine but it sometimes takes two attempts to get the vehicle started.
I have also noticed that if you dont let off when turning the key over it will eventually hit and start?

Just wanted to check and see if this was a simple issue before I take it to the dealer and get ripped off.

The only thing that has been done is that the EGR valve has been replaced.

Thanks!
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Old 09-20-2011, 06:12 AM
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Re: WK Starting Issue

Mine has been struggling lately to start as well. I've replaced a lot more than the EGR too, lol. And it has a brand new starter and battery. Hopefully someone can shed light on this.
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Old 09-20-2011, 08:33 AM
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Re: WK Starting Issue

Could be a lot of things (I went through something similar a little while back).

Common things to check (especially if they haven't been done recently, IMO):

1) Plugs and wires. If they haven't been serviced, you are certainly at the mileage where these cause hard-start conditions.

2) Try swapping your fuel pump relay with another. This was what I believe was causing my problems. A flaky relay would start the fuel pump sometimes, and not others. Eventually, it would kick in.

3) PCV Valve...not sure if it can cause your symptoms, but certainly wouldn't hurt if it hasn't been checked.

4) Check fuel line pressures (or have them checked).

5) Camshaft/Crankshaft position sensors.

I'm sure others with more experience will have other suggestions as well! Good luck.
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Old 09-20-2011, 10:07 AM
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Re: WK Starting Issue

Thanks for the info!
Just a note I have no CEL.

What is the best way to check the plug wires?
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Old 09-20-2011, 10:48 AM
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Re: WK Starting Issue

The Doc has it right, especially with the 05's. Verify all of his suggestions are good and within tolerance and I am sure you'll find your problem. The EGR Valve wouldn't have anything to do with it. Do you know the maintenance history of the vehicle and whether or not it has been maintained as scheduled?

It's due a 60K maintenance now, which is a fairly extensive inspection and maintenance procedure. I just finished mine about 5000 miles ago, and in addition I decided to change the MAP Sensor, install a Challenger IAT Sensor (thanks again robpp), and all O2 Sensors.
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Old 09-20-2011, 12:09 PM
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Re: WK Starting Issue

To check the wires, you want to make sure the resistance isn't too great, that the wire are in good physical shape, and with the hemi that they are routed properly through the loom (the plastic clips the wires pass through to get to the opposite side).

If they are real bad, you'll be able to see arcing when looking at them in the dark.

Can't remember what the resistance values for the wires are, but google or the fsm will provide the answer.
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Old 09-20-2011, 12:30 PM
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Re: WK Starting Issue

What's the difference made with the Chally IAT? Do you have a part number, and is it plug and play, or do you need a new plug?

Quote:
Originally Posted by jeepgcoman View Post
The Doc has it right, especially with the 05's. Verify all of his suggestions are good and within tolerance and I am sure you'll find your problem. The EGR Valve wouldn't have anything to do with it. Do you know the maintenance history of the vehicle and whether or not it has been maintained as scheduled?

It's due a 60K maintenance now, which is a fairly extensive inspection and maintenance procedure. I just finished mine about 5000 miles ago, and in addition I decided to change the MAP Sensor, install a Challenger IAT Sensor (thanks again robpp), and all O2 Sensors.
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Old 09-20-2011, 02:39 PM
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Re: WK Starting Issue

Robpp came up with this tidbit. It's a longer IAT Sensor and reads the temp. more from the middle of intake tube than the closer to the wall. Guess the purpose is to get a more accurate temp. reading and avoid the heat soak that is closer to the intake tube outer wall. I got one for my 05 LX too and it doesn't fit....different plug. It does fit on the 06 Hemi WK though, for those that are interested. I'll be searching for the new type plug for my 05, as it definitely suffers from a 5-10* heat soak and the sensor is located right in front of the throttle body butterfly. Here's robpp's thread. The part no. is toward the bottom of the post.

http://jeepgarage.org/showthread.php?t=28102
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Old 09-20-2011, 03:30 PM
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Re: WK Starting Issue

Quote:
Originally Posted by dr.lee.baugh View Post
To check the wires, you want to make sure the resistance isn't too great, that the wire are in good physical shape, and with the hemi that they are routed properly through the loom (the plastic clips the wires pass through to get to the opposite side).

If they are real bad, you'll be able to see arcing when looking at them in the dark.

Can't remember what the resistance values for the wires are, but google or the fsm will provide the answer.
Is there a write up on how to check the plug wires?
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Old 09-20-2011, 06:13 PM
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Re: WK Starting Issue

Again, the Doc is right on what to check regarding the wires. Just put one lead of the multimeter on each end of a wire and check the reading. In the old days the "rule of thumb" was NO MORE than 10000 ohms per foot of electronic supression wire. It should, however, normally be much less. I checked one of my original wires (I put Taylor Shorty wires on my 05 LX about 5 years ago) that had about 20000 miles on it, and the resistance was about 12000 ohms for the approximately 3 foot long wire. That should be a guideline, get you in the ballpark, and give you an idea of what to look for and expect for good wires. There may also be more accurate instructions in the FSM too.
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Old 09-20-2011, 07:12 PM
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Re: WK Starting Issue

Where would be a good place to get a FSM?
I suppose that I could use any multimeter and put it on ohms to test
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Old 09-21-2011, 06:57 AM
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Re: WK Starting Issue

Any old reliable multi-meter will do.

The resistance values can be seen in the attached.
Attached Files
File Type: pdf SparkPlugResistance.pdf (8.7 KB, 13 views)
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