Random Misfire
#1
Newbie
Thread Starter
Join Date: Apr 2012
Location: 757 Va
Posts: 4
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1994
Model: Cherokee
Engine: 4.0
Random Misfire
Sometimes when i start my jeep up it has a bad misfire but i can shut it off and start it right back up and it doesnt have a miss but it struggles to start, ive replaced just about everything i think of that would cause this plugs wires, distributor, crank sensor, external ignition coil, computer, fuel filter, tps throttle body gasket and i drive it around and it seems to be running fine untill i shut it off and turn it back on and has the bad misfire, but i can start it up again it doesnt have the miss,
its a 94 cherokee 4wd 4.0l auto has about 200,000 miles
any help text anytime 7578148258 or email me shadyredline@gmail.com looking to fix this problem and sell it
its a 94 cherokee 4wd 4.0l auto has about 200,000 miles
any help text anytime 7578148258 or email me shadyredline@gmail.com looking to fix this problem and sell it
Last edited by shadyredline; 04-26-2012 at 10:11 PM.
#4
CF Veteran
Join Date: Nov 2011
Location: State College, PA
Posts: 1,469
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1995
Model: Cherokee
Engine: 4.0 I6
This is a known problem with the 4.0s called a "heat soak." Usually it affects newer ones but my 95 does it occasionally. Whenever you kill the engine all the heat from the exhaust manifold will heat up the cylinder 3 injector to the point that it will misfire. It can be resolved by wrapping the injector in insulating tape
#5
CF Veteran
Join Date: May 2011
Location: va
Posts: 2,516
Likes: 0
Received 4 Likes
on
4 Posts
Year: 1996
Model: Cherokee
Engine: i-6 4.0
Originally Posted by bighouts5591
This is a known problem with the 4.0s called a "heat soak." Usually it affects newer ones but my 95 does it occasionally. Whenever you kill the engine all the heat from the exhaust manifold will heat up the cylinder 3 injector to the point that it will misfire. It can be resolved by wrapping the injector in insulating tape
Wow 2 years of being on this forum I've never heard it put so well!
#6
CF Veteran
Join Date: Jul 2010
Location: 802
Posts: 4,930
Likes: 0
Received 3 Likes
on
3 Posts
Year: 99
Model: Cherokee
Engine: 4.0
Originally Posted by shadyredline
, ive replaced just about everything i think of that would cause this plugs wires, distributor, crank sensor, external ignition coil, computer, fuel filter, tps throttle body gasket
its a 94 cherokee 4wd 4.0l auto has about 200,000 miles
its a 94 cherokee 4wd 4.0l auto has about 200,000 miles
#7
Member
Join Date: Jan 2012
Location: maquapit lake, NB, Canada
Posts: 117
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1999
Model: Cherokee
Engine: 1997 4.0 litre
maybe its worth taking it to someone who has the equipment to do a full engine diagnostics test? I'm having the same problem and I'm considering doing it
Trending Topics
#8
Newbie
Thread Starter
Join Date: Apr 2012
Location: 757 Va
Posts: 4
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1994
Model: Cherokee
Engine: 4.0
Changed the injectors
It starts up like the timings off anyway to check timing i tried with a timing light but there was no mark on the crank pulley to see if its in time
It starts up like the timings off anyway to check timing i tried with a timing light but there was no mark on the crank pulley to see if its in time
#9
CF Veteran
Join Date: May 2011
Location: va
Posts: 2,516
Likes: 0
Received 4 Likes
on
4 Posts
Year: 1996
Model: Cherokee
Engine: i-6 4.0
Originally Posted by shadyredline
Changed the injectors
It starts up like the timings off anyway to check timing i tried with a timing light but there was no mark on the crank pulley to see if its in time
It starts up like the timings off anyway to check timing i tried with a timing light but there was no mark on the crank pulley to see if its in time
#10
CF Veteran
Join Date: Nov 2010
Location: In the middle of Minnesota!
Posts: 5,805
Received 99 Likes
on
88 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
This does not sound like a timing issue, and base timing is controlled by the computer.
Does this misfire happen ONLY with a hot engine, ONLY with a cold engine, or BOTH? The answer to this question can help us narrow it down a bit.
Does this misfire happen ONLY with a hot engine, ONLY with a cold engine, or BOTH? The answer to this question can help us narrow it down a bit.
#11
Junior Member
Join Date: May 2011
Location: Indianapolis
Posts: 62
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2001
Model: Cherokee
Engine: 4.0
Originally Posted by bighouts5591
This is a known problem with the 4.0s called a "heat soak." Usually it affects newer ones but my 95 does it occasionally. Whenever you kill the engine all the heat from the exhaust manifold will heat up the cylinder 3 injector to the point that it will misfire. It can be resolved by wrapping the injector in insulating tape
#12
Newbie
Thread Starter
Join Date: Apr 2012
Location: 757 Va
Posts: 4
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1994
Model: Cherokee
Engine: 4.0
it does it cold when u first start it up and it struggles to start and it starts after u turn the key for a lil like it doesnt wanna start and boom it starts and sometimes its got a real bad miss and sometimes it runs fine but i need to fix this to sell it
text me with any suggestions 7578148258
text me with any suggestions 7578148258
#13
Senior Member
Join Date: Jan 2012
Location: vanburen
Posts: 720
Likes: 0
Received 1 Like
on
1 Post
Year: 1995 &2000
Model: Cherokee
Engine: 4.0
it does it cold when u first start it up and it struggles to start and it starts after u turn the key for a lil like it doesnt wanna start and boom it starts and sometimes its got a real bad miss and sometimes it runs fine but i need to fix this to sell it
text me with any suggestions 7578148258
text me with any suggestions 7578148258
#14
Newbie
Thread Starter
Join Date: Apr 2012
Location: 757 Va
Posts: 4
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1994
Model: Cherokee
Engine: 4.0
ill try that and let u know if it does anything thanks
Thread
Thread Starter
Forum
Replies
Last Post
pmd1995
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
3
07-29-2017 07:58 AM
pantallica20@aol.com
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
3
09-26-2015 07:05 PM
roystondrake
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
2
09-17-2015 11:14 AM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)