non-firing piston bore.
10-07-2013 | 03:21 AM
#16
CF Veteran
Joined: Apr 2012
Posts: 5,302
Likes: 21
From: Wisconsin
Model: Cherokee
Here's what I could find on code 36:
Overview
The air switching solenoid is part of the the air injection system. The air injection system consists of an air pump, the air switching solenoid, air switching relief valve, diverter valve and connecting hoses. The air injection system introduces air into the exhaust gas to aid in oxidization (burning) of hydrocarbons (unburned fuel) and carbon monoxide ( partially burned fuel) left over from the combustion process. The computer energizes and de-energizes the air switching solenoid to control the supply to engine vacuum to the air switching relief valve. When solenoid is energized engine vacuum is the sent to the air switching relief valve, which then directs the output of the air pump to the intake manifold. When the solenoid is de-energized, engine vacuum is removed from the air switching relief valve, and the valve directs the output of the air pump directly to the catalytic converter. If a problem is detected in the air switching solenoid, the computer sets code 36.
probable cause:
1. open or shorted wiring
2. dirty or loose connectors
3. Improper voltages and grounds
4. Defective solenoid
The air switching solenoid is part of the the air injection system. The air injection system consists of an air pump, the air switching solenoid, air switching relief valve, diverter valve and connecting hoses. The air injection system introduces air into the exhaust gas to aid in oxidization (burning) of hydrocarbons (unburned fuel) and carbon monoxide ( partially burned fuel) left over from the combustion process. The computer energizes and de-energizes the air switching solenoid to control the supply to engine vacuum to the air switching relief valve. When solenoid is energized engine vacuum is the sent to the air switching relief valve, which then directs the output of the air pump to the intake manifold. When the solenoid is de-energized, engine vacuum is removed from the air switching relief valve, and the valve directs the output of the air pump directly to the catalytic converter. If a problem is detected in the air switching solenoid, the computer sets code 36.
probable cause:
1. open or shorted wiring
2. dirty or loose connectors
3. Improper voltages and grounds
4. Defective solenoid
10-11-2013 | 07:55 PM
#17
Thread Starter
Newbie
Joined: Mar 2013
Posts: 25
Likes: 0
From: Wisconsin USA
Year: 1993 and 1999
Model: Cherokee
Engine: 4.0 6cyl
The continuing saga of the #2 bore that will not fire.
After changing some of the electrical parts, somebody suggested to me that maybe there was a busted valve spring. I followed up by taking the valve cover off. Some of the bolts were really loose. I am guessing it has been off before. Aside from having a lot of crud in the motor, the most noticeable thing was that one of the push rods was next to instead of under the rocker arm. I think it is the exhaust valve for the second bore.
I forgot to look if there was an inner spring, but the outer spring looks like all the rest. I took a wrench and moved the rocker arm up and down. It appears to operate in the normal manner. I am thinking that at the least I need to unbolt the rocker arm (most likely both for the piston), and check the push rod for straightness.
Anybody have an idea how a problem of this sort would develop? What might be done about it?
John
After changing some of the electrical parts, somebody suggested to me that maybe there was a busted valve spring. I followed up by taking the valve cover off. Some of the bolts were really loose. I am guessing it has been off before. Aside from having a lot of crud in the motor, the most noticeable thing was that one of the push rods was next to instead of under the rocker arm. I think it is the exhaust valve for the second bore.
I forgot to look if there was an inner spring, but the outer spring looks like all the rest. I took a wrench and moved the rocker arm up and down. It appears to operate in the normal manner. I am thinking that at the least I need to unbolt the rocker arm (most likely both for the piston), and check the push rod for straightness.
Anybody have an idea how a problem of this sort would develop? What might be done about it?
John
10-15-2013 | 12:32 PM
#19
Thread Starter
Newbie
Joined: Mar 2013
Posts: 25
Likes: 0
From: Wisconsin USA
Year: 1993 and 1999
Model: Cherokee
Engine: 4.0 6cyl
Without going on through all the nasty details because there a lot of them, I am finally down to a motor that still misses and blows small amounts of antifreeze out the tailpipe. Oh, just a little diluted with water.
So, with a 1994 jeep inline 6, is their anything other than a bad head gasket that would cause this? Anybody care to guess what it would cost to get the gasket changed? I have the tools and stuff, but I hate to mess with it. In my imagination an exhaust stud always breaks off and screws the project.
John
So, with a 1994 jeep inline 6, is their anything other than a bad head gasket that would cause this? Anybody care to guess what it would cost to get the gasket changed? I have the tools and stuff, but I hate to mess with it. In my imagination an exhaust stud always breaks off and screws the project.
John
10-15-2013 | 12:53 PM
#20
CF Veteran
Joined: Jul 2012
Posts: 1,395
Likes: 0
From: SD
Year: 1998
Model: Cherokee
Engine: 4.0
One thing for sure, don't run the engine until it's fixed!
Thread
Thread Starter
Forum
Replies
Last Post
Endlessknight
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
4
09-26-2015 04:20 PM
spjohnson1031
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
17
09-23-2015 03:05 PM
little smathers
Modified XJ Cherokee Tech
0
09-20-2015 04:32 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)