Graebicon

My '07 JK Wrangler seems to have problems starting. It starts every time, however, sometimes it takes a few seconds to actually start. It is not my battery nor is it my starter. I believe it can only be a fuel issue or spark issue. Correct? I bought this JK used three months ago with only 10,500 miles on it from a woman that deployed all the time. Being a 2007, it was obvious the Jeep sat for quite some time. I drive it everyday. This issue is only after is has been driven and warmed up. In the mornings, or after it has been sitting for awhile, I do NOT have this problem. However, after driving around, it will take a bit to crank. Should I change my sparkplugs, etc?

stlfan06

First thing that popped into my head was spark plugs.. That's a pretty cheap option to try..also, make sure your battey terminals are clean and not corroded.

Kemikal

Same thing happens to my 07 JK...not every time, but maybe once a week or so...

benny

I believe the problem is going to be your crank position sensor, it was on mine. Every once in awhile it would just crank and not start, I would stop, try again and it would start.
It's worth looking into, the dealer replaced mine and I haven't had that problem for over 2 years now.

ronjenx

The cam position sensor will cause these symptoms, too. The gap can bee too large, or too small, in addition to just being a bad sensor. A bad sensor should set a code, though.

benny

I believe you are correct, it was the cam position sensor, not the crank sensor, my bad, it's been awhile and too many beers ago. I just noticed that every once in awhile it would just turn over and not start and when I stopped and tried again it would start. Mine did not set off any codes though.
I went into the dealership and asked them if it was possible that the crank pos. sensor was bad and it was the cam sensor. I got lucky because the tech at the dealership had a few come in with the same problem.
They replaced it and all has been well for over 2 years.

Octo

Mine did this when it was new 3 years ago and was fixed under a recall. If you haven't already take it to the dealership and ensure that all applicable recalls have been completed on it.

Graebicon

Thank you all that posted. Gave me some helpful info! I will check on recalls and I plan on doing the sparkplugs this coming weekend!

Again, thanks

TRJeff

Check battery, too much electrical things need to happen for a good quick start!

jdubb75

Here't the TSB for the "Long Crank Time" due to the cam sensor.

http://project-jk.com/jeep-jk-tsb-re...-camshaft-gear

And, here's a list of other TSB's and Recalls.

https://www.jk-forum.com/forums/show...ll-Information

Being that it still has low mileage and that it is an 07, there is a small possibility that it may still be under the original 3yr/36,000 warranty if it were purchased at the end of 07. You should be able to contact a local dealer and have them run your VIN to see if it has any existing warranty or outstanding recalls. I'm pretty sure you can also enter your VIN on Jeep's website and find the info too, but I don't have a link for that.