Jeep died, mid acceleration, burnt smell... any ideas? - JeepForum.com

 
LinkBack Thread Tools
post #1 of 8 Old 09-26-2010, 04:18 AM Thread Starter
kainers
Registered User
1990 YJ Wrangler 
 
Join Date: Jul 2010
Location: las vegas
Posts: 39
Jeep died, mid acceleration, burnt smell... any ideas?

So, I am taking a turn in my jeep, and half way into accelerating the engine cuts off. I immediately smell a little burn, coast to the side of the road. Try and start the engine again...the thing is trying to start, but doesnt turn over. The lights and other electrical things work. Gas was a little less then quarter tank, even had someone pull over and toss in 1.5 gallons on top for me, just incase gas guage was messed up...still wouldn't explain the burn smell though. After trying to start it a few more times, I smell that burn smell again... give up, and call for a tow

Any ideas?

90 YJ,4.2, howell TBI, automatic.

kainers is offline  
Sponsored Links
Advertisement
 
post #2 of 8 Old 09-26-2010, 06:00 AM
kahanabob
Registered User
1992 YJ Wrangler 
 
Join Date: May 2010
Location: Maui
Posts: 507
Timing Chain? take distributaor cap off , have someone crank the engine over and you watch the rotor to see if it turns.
kahanabob is offline  
post #3 of 8 Old 09-26-2010, 06:02 AM
kloppk
Registered User
1992 YJ Wrangler 
 
Join Date: Oct 2006
Posts: 2,751
Check to see if you have any spark at the plugs and take it from there.


For the burning smell I'd suggest checking the fuzable links (look like fat wires) attached to your starting solenoids Battery Terminal. See if any of the wire attached to it appear "cooked".

Solenoid looks like this...



It could be a number of this... such as...
- Wire somewhere chafing and shorting to ground
- Broken wire
- Failed Ignition Module
- Failed dizzy pickup coil
- Failed ECU
- etc
kloppk is offline  
post #4 of 8 Old 09-26-2010, 06:35 AM Thread Starter
kainers
Registered User
1990 YJ Wrangler 
 
Join Date: Jul 2010
Location: las vegas
Posts: 39
Thanks for the late night replies! I'll look into these things.
kainers is offline  
post #5 of 8 Old 09-26-2010, 07:28 AM
LoggingRoads
Registered User
1988 YJ Wrangler 
 
Join Date: Sep 2010
Location: Shingletown
Posts: 143
When you say it "doesn't turn over" do you mean it won't crank, or it cranks but won't start?

If it won't crank, have you tried shorting across the solenoid with a screwdriver? If it cranks when you do this, where it would not before, then you know to start looking through the starting circuit that powers the solenoid.. If you can't get it to crank by shorting out the solenoid, then look into the cables, starter, or solenoid itself..

However, the fact that this happened while driving, makes me think you meant "cranks, but won't start" as opposed to won't crank...

In which case, power is likely no longer getting to the ignition system.. Like others suggested, see if you get spark when cranking.. if not, then you know that is the problem...

Besides the fusible links, the very first place I'd look is for blown fuses.. as they only blow when there is a problem.. Their job is to protect the wiring that follows when there is a short or over current.

If you find a blown fuse or more, then figure out what circuit that fuse protects.. If it is something that is required for the engine to run, then viola.. you know you are on the right track, and can start troubleshooting the circuit that that fuse protects...

The burnt smell is likely electrical.. and 90% of all "won't run" problems are electrical in cause... As to timing chain issues, I can't see how that would cause a 'burnt smell'... but I suppose anything is possible...

Of course, I'm 'assuming' that when you say 'burnt smell' you are referring to that 'ozone' smell created by electrical shorts... and not oil or some other smell..

If after this happened, it wouldn't even crank, and you get no click of the solenoid or anything, then I'd look into the 'run' circuit that comes off the ignition switch... (after first trying to get it to crank by shorting across the solenoid with a screwdriver or needle nose pliers)....

So first get it cranking, and then make sure you have spark at the coil, and then go from there... troubleshooting is nothing more than a process of elimination using a 'divide and conquer' approach to the systems in your vehicle...

The diagram of the starter solenoid that kloppk posted has a number of terminals on it that could give you a clue to the problem.. It is an excellent trouble shooting point, and with all that goes through it, could easily be the problem itself... if not, then it is a good place to check for voltages on the various outputs..... Next time you 'smell that smell' see if you can tell if it's coming from the solenoid...

Mark
LoggingRoads is offline  
post #6 of 8 Old 09-26-2010, 04:53 PM Thread Starter
kainers
Registered User
1990 YJ Wrangler 
 
Join Date: Jul 2010
Location: las vegas
Posts: 39
Hi, I mean it will crank but not start. I have to go to work a little earlier than expected today, so I won't get much time with it. It's also been forever since I've had a jeep...so I am having a hard time remembering where things are :P. Definately happy to have a jeep again though...just hope I don't have things going on like this often with this rig.

And ya, the burnt smell definately smells like an electrical burn smell...like when a power cord on a iron or something shorts out.

Thanks for the input..I'll get on the case and report back shortly.
kainers is offline  
post #7 of 8 Old 09-26-2010, 09:56 PM
Castr8r
Registered User
2006 LJ Wrangler 
 
Join Date: May 2008
Location: West Central Illinois
Posts: 537
When I finally figured out the same problem on my '89 Wrangler, it was a short in the hot wire to the O2 sensor, and it had fried one of the fusible links. We found it accidentaly at late evening, while trying to start it after replacing the link with a fuse. Sparking from the short showed up really well...
Castr8r is offline  
post #8 of 8 Old 10-14-2010, 03:45 PM Thread Starter
kainers
Registered User
1990 YJ Wrangler 
 
Join Date: Jul 2010
Location: las vegas
Posts: 39
It ended being the cluster of wires that came in the engine bay around the top right area of the steering column. When they were unwrapped there were a whole bunch of wires burned up real bad. They were cut out, and then new wire was soldered in its place and sealed up.
kainers is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Help with burnt wiring smell? Bob97TJ TJ Wrangler Technical Forum 3 03-19-2009 07:02 AM
burnt smell $300WRANGLER YJ Wrangler Technical Forum 10 05-08-2008 11:10 AM
Burnt Coolant Smell wingzero1285 TJ Wrangler Technical Forum 12 07-02-2007 10:38 AM
Jeep Died - Any Ideas? ChevDog1 YJ Wrangler Technical Forum 8 03-14-2007 03:07 PM
Burnt Smell YellowJeep2002 TJ Wrangler Technical Forum 4 02-09-2004 01:30 PM

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
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome