Jeep wont start
12-28-2012, 09:56 PM
#1
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Year: 1990
Model: Cherokee
Engine: 4.0 6L
Jeep wont start
i replaced fuel pump, filter, spark plugs, cables, dis cap, fuel reg, and battier. i have spark, i have fuel.
12-28-2012, 10:21 PM
#4
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I'm not gonna ask why you replaced all that stuff, then. I'm sure you have your reasons.
An internal combustion engine requires three things to run, fuel, fire, and air. If it's not running, you're missing one of them. Do you hear your fuel pump priming? Have you checked fuel pressure at the rail? How did you test for spark? What kind of fuel pump? Did you make sure your plugs were properly gapped? Did you knock a vacuum line off or accidentally disconnect something while performing all this maintenance? Are you sure you got your plug wires in the right order? Have you tried bypassing the balast resistor?
An internal combustion engine requires three things to run, fuel, fire, and air. If it's not running, you're missing one of them. Do you hear your fuel pump priming? Have you checked fuel pressure at the rail? How did you test for spark? What kind of fuel pump? Did you make sure your plugs were properly gapped? Did you knock a vacuum line off or accidentally disconnect something while performing all this maintenance? Are you sure you got your plug wires in the right order? Have you tried bypassing the balast resistor?
12-28-2012, 10:29 PM
#5
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Year: 1990
Model: Cherokee
Engine: 4.0 6L
yes, yes, i used a spark plug to see if it spark, precision fuel pump, yes, vacum lines are good, everything is in the rite place, yes and yes
12-28-2012, 11:22 PM
#7
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Nope, the timing isn't adjustable. The only way it could be the timing is if the timing chain broke. If it were just stretched it would probably still start but it would run like crap. I'm out of ideas. We'll have to wait for someone else.
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12-28-2012, 11:28 PM
#8
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Year: 1990
Model: Cherokee
Engine: 4.0 6L
ok, my jeep just started but i have to keep my foot on the gas, has soon as i let go it turns off, and the intake is back firing
12-29-2012, 12:05 AM
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Year: 1990 Laredo
Model: Cherokee
Engine: 4.0 Inline 6 Renix
if you have a back fire ... it is either your fuel pressure is low or you have the wrong firing order for your plug wires... do you have a mech fuel gauge at the rail? What is your fuel pressure? What kind of fuel pump did you put in there?
12-29-2012, 12:08 AM
#13
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Year: 1990 Laredo
Model: Cherokee
Engine: 4.0 Inline 6 Renix
now I am going to ask if your jeep was running perfectly fine why did you change all those parts?
12-29-2012, 12:11 AM
#14
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Year: 1990
Model: Cherokee
Engine: 4.0 6L
no i dont have a gauge on my fuel rail, and what should the presure be at? it has a precision fuel pump, the complete assemble
12-29-2012, 12:15 AM
#15
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Year: 1990
Model: Cherokee
Engine: 4.0 6L
i changed all of those parts, after it wounldnt start thinking i had a problem with spark or gas. but it does the same thing