please help
12-12-2011, 03:42 PM
#1
Newbie
Thread Starter
Join Date: Dec 2011
Posts: 7
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
please help
1987 cherokee stalled the other day now it wont start has good fuel and spark dont know what to start cheking first it cranks but thats it nothing no sputtering puttering nothing please help
Thanks
Thanks
12-12-2011, 04:48 PM
#2
Seasoned Member
Join Date: Apr 2011
Location: Outside of RTP NC
Posts: 451
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1993
Model: Grand Cherokee
Engine: V8
For an engine to run, it requires 3 things. In no particular order...Air, Fuel and Spark.
Dont worry about the air, chances are 100% it is getting air. That leaves Spark and Fuel. Since you state it is getting both, your engine is running. Now THAT was a logical fix!
All kidding aside, its not rocket surgery. The engine is not getting either spark or fuel. Pick one of those twoo and start testing. Fuel Pressure Gauge, or a calibrated spark gap guage (which is close to useless in real life)
Ron
Dont worry about the air, chances are 100% it is getting air. That leaves Spark and Fuel. Since you state it is getting both, your engine is running. Now THAT was a logical fix!
All kidding aside, its not rocket surgery. The engine is not getting either spark or fuel. Pick one of those twoo and start testing. Fuel Pressure Gauge, or a calibrated spark gap guage (which is close to useless in real life)
Ron
12-12-2011, 05:01 PM
#4
Newbie
Thread Starter
Join Date: Dec 2011
Posts: 7
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
i have tested the fuel at the valve on the rail and it is good test spark from coil to distrubter and from ther to the end of the spark plug wires and just put in new plugs
12-12-2011, 06:48 PM
#5
Seasoned Member
Join Date: Apr 2011
Location: Outside of RTP NC
Posts: 451
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1993
Model: Grand Cherokee
Engine: V8
OK, make this difficult on your self then
*How many bars or psi of pressure do you have at the fuel rail. What is your elevation above sea level so we can compensate and tell you if it is correct.
* Plus or minus 100 thousandths, how far does the spark jump. We will also need to know the relative humidity and the ambient air temperature so that we can make an educated guess, as an UN-pressurized spark is generally useless.
There are tons of guys on this forum who can help you PROVIDED you allow us to help you. DONT tell us the damn thing is broken, tell us WHATS broken. Details, details, details.
Now, you have Air. Find out how much fuel pressure you have...and it squirting out does not count. Measure it.
That will only leave spark, regardless of what you see.
Ron
*How many bars or psi of pressure do you have at the fuel rail. What is your elevation above sea level so we can compensate and tell you if it is correct.
* Plus or minus 100 thousandths, how far does the spark jump. We will also need to know the relative humidity and the ambient air temperature so that we can make an educated guess, as an UN-pressurized spark is generally useless.
There are tons of guys on this forum who can help you PROVIDED you allow us to help you. DONT tell us the damn thing is broken, tell us WHATS broken. Details, details, details.
Now, you have Air. Find out how much fuel pressure you have...and it squirting out does not count. Measure it.
That will only leave spark, regardless of what you see.
Ron
12-13-2011, 02:24 AM
#7
CF Veteran
Join Date: Nov 2010
Location: some small town oregon
Posts: 15,581
Likes: 0
Received 8 Likes
on
8 Posts
Year: 1989
Model: Cherokee
Engine: 4.0
Originally Posted by jronald
OK, make this difficult on your self then
*How many bars or psi of pressure do you have at the fuel rail. What is your elevation above sea level so we can compensate and tell you if it is correct.
* Plus or minus 100 thousandths, how far does the spark jump. We will also need to know the relative humidity and the ambient air temperature so that we can make an educated guess, as an UN-pressurized spark is generally useless.
There are tons of guys on this forum who can help you PROVIDED you allow us to help you. DONT tell us the damn thing is broken, tell us WHATS broken. Details, details, details.
Now, you have Air. Find out how much fuel pressure you have...and it squirting out does not count. Measure it.
That will only leave spark, regardless of what you see.
Ron
*How many bars or psi of pressure do you have at the fuel rail. What is your elevation above sea level so we can compensate and tell you if it is correct.
* Plus or minus 100 thousandths, how far does the spark jump. We will also need to know the relative humidity and the ambient air temperature so that we can make an educated guess, as an UN-pressurized spark is generally useless.
There are tons of guys on this forum who can help you PROVIDED you allow us to help you. DONT tell us the damn thing is broken, tell us WHATS broken. Details, details, details.
Now, you have Air. Find out how much fuel pressure you have...and it squirting out does not count. Measure it.
That will only leave spark, regardless of what you see.
Ron
Trending Topics
12-13-2011, 01:57 PM
#8
Member
Join Date: Apr 2011
Location: Washington
Posts: 228
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1998
Model: Grand Cherokee
Engine: 4.0 I6
OK, make this difficult on your self then
*How many bars or psi of pressure do you have at the fuel rail. What is your elevation above sea level so we can compensate and tell you if it is correct.
* Plus or minus 100 thousandths, how far does the spark jump. We will also need to know the relative humidity and the ambient air temperature so that we can make an educated guess, as an UN-pressurized spark is generally useless.
There are tons of guys on this forum who can help you PROVIDED you allow us to help you. DONT tell us the damn thing is broken, tell us WHATS broken. Details, details, details.
Now, you have Air. Find out how much fuel pressure you have...and it squirting out does not count. Measure it.
That will only leave spark, regardless of what you see.
Ron
*How many bars or psi of pressure do you have at the fuel rail. What is your elevation above sea level so we can compensate and tell you if it is correct.
* Plus or minus 100 thousandths, how far does the spark jump. We will also need to know the relative humidity and the ambient air temperature so that we can make an educated guess, as an UN-pressurized spark is generally useless.
There are tons of guys on this forum who can help you PROVIDED you allow us to help you. DONT tell us the damn thing is broken, tell us WHATS broken. Details, details, details.
Now, you have Air. Find out how much fuel pressure you have...and it squirting out does not count. Measure it.
That will only leave spark, regardless of what you see.
Ron
