Jeep Wrangler Forum - Reply to Topic
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum > 95 4.0 random starting problems

Join Wrangler Forum Today

Thread: 95 4.0 random starting problems Reply to Thread
Post Icons
You may choose an icon for your message from the following list:

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Additional Options
Miscellaneous Options

Topic Review (Newest First)
10-13-2013 03:16 PM
CMike357 I would go ahead and check the MAP sensor. While you're at it go ahead and check the O2 sensor. Try disconnecting the battery to reset the computer.
10-13-2013 11:26 AM
wampus19 No giving it gas won't help you just have to turn it off until it cranks right I already changed the cps I'll check the o2
10-13-2013 09:16 AM
CMike357 When it starts and runs rough, does giving it more gas help? I'm thinking it may be injector related. Do you ever run a can of cleaner through it?
10-13-2013 02:38 AM
W5KVV OK, that has o2 sensor written all over it. The o2 heater is active until the exhaust gets up to operating temp. If the heater in the o2 sensor is bad, it will cause them to do all kinds of crazy stuff.
10-12-2013 10:12 AM
wampus19 Only at start up it drives perfect
10-12-2013 01:43 AM
W5KVV Does it only do it only at startup or does it happen driving down the road? Crank sensor & a roasted o2 sensor come to mind.

I had a 91 XJ that had the same symptoms & it was the crank sensor. Turned out to be a pinched wire in the CPS harness.
10-11-2013 12:05 PM
wampus19 It does it hot or cold just randomly had a tps code fixed had a map code but it went away of course the ac code
10-11-2013 11:12 AM
CMike357 Is it throwing any codes? When it runs rough is a cold or warm engine?
10-11-2013 01:14 AM
95 4.0 random starting problems

Ok I got a 95 4.0 automatic sometimes it cranks and runs perfect but randomly it will crank and run really ruff if I turn it off and keep trying eventually it will crank and run perfect put a new distributor wires plugs rotor button cap and a tps

first jeep

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -5. The time now is 02:44 AM.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC. is not in any way associated with the Chrysler Motors LLC