Jeep Wrangler TJ 2001 -cranks but won't start

105

Asked by AtJeep Jan 20, 2009 at 02:59 PM about the 2001 Jeep Wrangler SE

Question type: Maintenance & Repair

This has gone on for months.  The Jeep just died one day and
starts when it wants to.  Usually cranks but won't start. Changing computer didn't help.  Gas
gauge doesn't work but will work if the vehicle starts.
Can you help?

7 Answers

95

How about checking the timing on the Jeep and have it done properly. Your spark plug wires may be off by one or two and that could be the problem right there. If it's not the timing, then it could be your fuel system. You may be getting the spark and the air required, but no fuel. Also, check the air delivery system, i.e.: your air filter, all its corresponding hoses to the air intake manifold, etc. When your TJ cranks, does it bog? Meaning does it seem to struggle during cranking? What are the temperatures like when you start your Jeep? Temps have a lot to do with the time to start because your oil is a lot thicker and will not allow your internals to cranks as quickly as they need to. Write back! Sean Dickerson keithclansman@aol.com

4 people found this helpful.
105

Thanks for the help Sean3090 but this one is not so easy. My Jeep has been to a few mechanics that cant find the problem. Cranking is fine and not labored at all. The problem started in the summer so temp makes no differance. It seems that when it doesn't want to start that there is no spark and the engine doesn't flood, it's like some parts of the electrical system are effected. Like I stated even the fuel gauge acts up when it wont start. I am thinking maybe its the crank sensor but would it be controlling so many things.

10 people found this helpful.
120

I'm have this exact problem same symptoms also the volt gage doesn't move for about 10 seconds until the check engine light comes on then it reads about 9 volts. I suspect it could be a ground issue but haven't found it yet. Was going to try and ecm until I saw this.

3 people found this helpful.
120

My jeep wrangler finally quit starting, just cranked no start, same symptoms so I could diag it now. What I eventually traced it to was the switched 12v feed wire for the ECM runs in the harness from the underhood fuse block past the battery to the ECM. It had a small pinhole in it and was corroding from the inside, which is why I was only getting 9 volts it was hard to see but the wire had begun to swell a bit from the corrosion inside. I replaced the bad section of wire by soldering in a new piece. Problem solved.

9 people found this helpful.
170

This is a common problem and it is just a bad crankshaft position sensor. This crank sensor is cheap and easy to replace. When they go bad, the Jeep will start sometimes, and other times it will crank but not start. It can even die while you are driving. The part is about 30 bucks. Just put a new one on and set the spacing properly.

11 people found this helpful.
170

A bad crankshaft position sensor will not allow spark or fuel....but the Jeep will crank away....just will not start, whenever the crank sensor acts up. Replace it and it will run fine.

6 people found this helpful.
30

Okay all my mother in-law 05 Wrangler is doing the same thing. I have replaced ecm, spark plugs, crank positioning sensor, and a few other things, tried starting with starting fluid and it would just crank but no fire. I’m starting to think it’s the coil bank but I’m not sure because the codes are p0508 p0688 andp0518.

3 people found this helpful.

Your Answer:

Wrangler

Looking for a Used Wrangler in your area?

CarGurus has 1,597 nationwide Wrangler listings starting at $5,000.

Postal Code:

Jeep Wrangler Experts

  • #1
    Mathew Wooldridge
    Reputation
    800
  • #2
    G A Arne
    Reputation
    690
  • #3
    F_O_R
    Reputation
    660
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Jeep Grand Cherokee
82 Great Deals out of 4,728 listings starting at $1,938
Used Toyota Tacoma
43 Great Deals out of 1,941 listings starting at $5,999
Used Ford F-150
167 Great Deals out of 12,443 listings starting at $2,800
Used Ford Mustang
25 Great Deals out of 1,936 listings starting at $5,990
Used Jeep Cherokee
69 Great Deals out of 4,873 listings starting at $7,988
Used Toyota 4Runner
21 Great Deals out of 1,039 listings starting at $7,700
Used Chevrolet Silverado 1500
107 Great Deals out of 10,116 listings starting at $3,655
Used Chevrolet Camaro
36 Great Deals out of 913 listings starting at $8,395
Used Chevrolet Corvette
15 Great Deals out of 492 listings starting at $7,995
Used Jeep Liberty
111 listings starting at $2,995

Used Cars for Sale

2019 Jeep Wrangler For Sale
215 listings starting at $30,495
2018 Jeep Wrangler For Sale
3 Great Deals out of 84 listings starting at $23,495
2017 Jeep Wrangler For Sale
5 Great Deals out of 90 listings starting at $20,995
2016 Jeep Wrangler For Sale
3 Great Deals out of 89 listings starting at $19,995
2015 Jeep Wrangler For Sale
5 Great Deals out of 76 listings starting at $17,989

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.