Help with my 1987 wrangler - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > Help with my 1987 wrangler

*VOTE NOW Help Metalcloak Giveaway an XJ Suspension*Stainless Steel Door Hinge PinsPoly Door Hinge Bushings

Reply
Unread 09-08-2013, 07:58 PM   #1
Alphasolder
Registered User
1987 YJ Wrangler 
 
Join Date: Aug 2013
Location: Brighton, Co
Posts: 37
Help with my 1987 wrangler

As some of you may remember I was here with emissions problem. still haven't passed emissions but the big issue now is it won't stay running and has trouble starting it is getting gas this problem is progressively worse I went and picked it up from mechanic shop and they have no idea what it could be. So here's what I've done
Spark plugs
Coil
New carb a carter
Starter solenoid
Fuel filter
Fuel pump
O2sensor
Cat
Cleaned engine out of carbon
Changed gears from 456 to 373
Added downdraft pulse air system to get a waiver
Changed oil
I looked at the ICm today cleaned it off put it back on
None of this has helped the stalling and the starting issue please help I'm out of money to take it to the shop

Alphasolder is offline   Reply With Quote
Unread 09-08-2013, 07:59 PM   #2
Alphasolder
Registered User
1987 YJ Wrangler 
 
Join Date: Aug 2013
Location: Brighton, Co
Posts: 37
So forgot to tell you I have the 4.2 motor
Alphasolder is offline   Reply With Quote
Unread 09-08-2013, 08:05 PM   #3
Tom95YJ
[] Eye'd Jeep Connoisseur
 
Tom95YJ's Avatar
1999 XJ Cherokee 
 
Join Date: Sep 2004
Location: Salt Lake City, Utah
Posts: 8,174
When I bought my YJ it would not idle on its own and had issues running. I replaced my vacuum lines now it runs great. I wouldn't be surprised if that's your issue
__________________
'89 YJ The Smurf Build Thread
'99 XJ Black Betty Build Thread
Tom95YJ is offline   Reply With Quote
Unread 09-08-2013, 08:15 PM   #4
Alphasolder
Registered User
1987 YJ Wrangler 
 
Join Date: Aug 2013
Location: Brighton, Co
Posts: 37
Supposedly the mechanic checked that
Alphasolder is offline   Reply With Quote
Unread 09-08-2013, 08:21 PM   #5
salsomano1a
Registered User
1991 YJ Wrangler 
 
Join Date: Apr 2011
Location: Orlando, FL
Posts: 148
make sure you have a strong ground to the battery to the chasis of the jeep, believe or not that was my starting problem for months.
salsomano1a is offline   Reply With Quote
Unread 09-09-2013, 08:23 AM   #6
Alphasolder
Registered User
1987 YJ Wrangler 
 
Join Date: Aug 2013
Location: Brighton, Co
Posts: 37
Do you just add a wire and hook it to the jeep?
Alphasolder is offline   Reply With Quote
Unread 09-13-2013, 10:21 AM   #7
Alphasolder
Registered User
1987 YJ Wrangler 
 
Join Date: Aug 2013
Location: Brighton, Co
Posts: 37
87 wrangler 4.2 won't start.

Trying to go over the vacuum it isn't right I can't find one for the lines to the carb I know they are messed up
Alphasolder is offline   Reply With Quote
Unread 09-13-2013, 10:24 AM   #8
jbolty
Moderator
 
jbolty's Avatar
1990 YJ Wrangler 
 
Join Date: Jun 2007
Location: San Diego, CA
Posts: 15,551
everything you need regarding the 4.2 is here.

http://home.sprynet.com/~dale02/list.htm
__________________
.
"The right to be heard does not necessarily include the right to be taken seriously." —Hubert Humphrey
.
If you live within wheeling distance of San Diego county, click here
jbolty is offline   Reply With Quote
Unread 09-13-2013, 06:57 PM   #9
salsomano1a
Registered User
1991 YJ Wrangler 
 
Join Date: Apr 2011
Location: Orlando, FL
Posts: 148
no im talking about the normal ground that goes from the chasis to the battery.
salsomano1a is offline   Reply With Quote
Unread 09-14-2013, 11:49 PM   #10
Alphasolder
Registered User
1987 YJ Wrangler 
 
Join Date: Aug 2013
Location: Brighton, Co
Posts: 37
Thank you I used those diagrams worked well but my jeep won't start still
Alphasolder is offline   Reply With Quote
Unread 09-14-2013, 11:53 PM   #11
Alphasolder
Registered User
1987 YJ Wrangler 
 
Join Date: Aug 2013
Location: Brighton, Co
Posts: 37
Okay I will check I did just redo all the vacuum so all is fixed there but still won't run do I have a crankshaft position sensor on my jeep? I know the 4.0 have it but I looked today I see where it would hookup but I have no electric pigtail anywhere or anywhere to plug into for that matter
Alphasolder is offline   Reply With Quote
Unread 09-15-2013, 12:02 AM   #12
Alphasolder
Registered User
1987 YJ Wrangler 
 
Join Date: Aug 2013
Location: Brighton, Co
Posts: 37
Does all 1987 wranglers have a cps

I just got done doing all my vacuum lines. Still wont start which didn't surprise me to bad but it usually does so I checked into crankshaft position sensor and I don't have one on mine I see where it would hook up but there's no wiring harness for it and the absence of the sensor itself my motor is the 4.2 I know the 4.0 has one but does the carberatored engines have one? please help
Alphasolder is offline   Reply With Quote
Unread 09-15-2013, 12:19 AM   #13
Tom95YJ
[] Eye'd Jeep Connoisseur
 
Tom95YJ's Avatar
1999 XJ Cherokee 
 
Join Date: Sep 2004
Location: Salt Lake City, Utah
Posts: 8,174
Quote:
Originally Posted by Alphasolder View Post
Okay I will check I did just redo all the vacuum so all is fixed there but still won't run do I have a crankshaft position sensor on my jeep? I know the 4.0 have it but I looked today I see where it would hookup but I have no electric pigtail anywhere or anywhere to plug into for that matter
The 4.0 was not offered in the wrangler in 1987, Also the 4.0 was never a Carbureted engine it has always has had fuel injection .
Your engine should be a 258 aka 4.2L
__________________
'89 YJ The Smurf Build Thread
'99 XJ Black Betty Build Thread
Tom95YJ is offline   Reply With Quote
Unread 09-15-2013, 12:34 AM   #14
Tom95YJ
[] Eye'd Jeep Connoisseur
 
Tom95YJ's Avatar
1999 XJ Cherokee 
 
Join Date: Sep 2004
Location: Salt Lake City, Utah
Posts: 8,174
4.2 doesn't have a CPS. Your probably needing an ignition control module, Which is located on the driver side below the washer fluid reservoir
__________________
'89 YJ The Smurf Build Thread
'99 XJ Black Betty Build Thread
Tom95YJ is offline   Reply With Quote
Unread 09-15-2013, 07:40 AM   #15
Old4X
Registered User
1990 CJ7 
 
Join Date: Nov 2008
Location: Ga
Posts: 4,537
For what you have already spent for no effect, you could have put an EPA approved fuel injection system on the engine.

There isn't a mechanic working today that was good with carburetors when they were still being sold on new cars. All you will find is fuel injection mechanics. If you spend the time and do the required studying, you can repair and maintain a carbed motor. But it is far easier today to just install fuel injection.

If I were still running a shop and you pulled your jeep in for repair to pass emissions, I would have to ask for $2500 cash up front with no guarantee, and all work on a time and material basis, in other words- 2500 in to see if you are serious, final price could end up far more. These are complicated setups, many parts are out of production, and most locals consider them antiques, not DD vehicles any more.
__________________
Rust free YJ for sale. Need more room in barn.
Old4X is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.