4.0 intake swap problems
#1
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Year: 1991
Model: Cherokee
Engine: 4.0
4.0 intake swap problems
I have a 91 Xj I put a 99+intake on it with a header and a 62mm tb and I lost power I can't figure out why everything I have seen says other wise I reused the injectors off my old intake because I have already upgraded to the 4 pintal ford ones I also put a new o2 sensor on it I broke the old one when I tryed to take it out of the old header if any one has any tip it would be great
#2
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Year: 1995
Model: Cherokee
Engine: 4.0 I6
make sure all the vacuum lines are connected correctly no leaks. all sensors and injectors are hooked up in the correct order. if youre still having problems id check to make sure the injectors are working properly.
#3
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Year: 1991
Model: Cherokee
Engine: 4.0
I have smoke tested it no vacuum leaks hooked up to obd1 scan tool all sensors reading correctly so everything should be hooked up and I don't see anything unhooked and all my injectors are working correctly I bench tested them
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Year: Different Years (I have several XJ's)
Model: Cherokee
Engine: 4.0 HO
Originally Posted by Joshbuehrle
I have smoke tested it no vacuum leaks hooked up to obd1 scan tool all sensors reading correctly so everything should be hooked up and I don't see anything unhooked and all my injectors are working correctly I bench tested them
#5
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Year: 1991
Model: Cherokee
Engine: 4.0
How was your PVC valve bad a 4.0 dosnt have one it is built in to the valve cover and I already put a new fuel pressure regulator on it and I check fuel pressure it's correct and the map sensor is showing the right voltage I have spent some time on this and I just can't figure it out I even gasket and flow mached the intake runners when I did it
#6
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Year: 1991
Model: Cherokee
Engine: 4.0
I have heard the certain brands of o2 sensors don't agree with jeeps anyone have any input on that I have a direct fit bosh one on there now I don't know what was on there before but the ends of the o2 sensor did look different
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Year: Different Years (I have several XJ's)
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Engine: 4.0 HO
Originally Posted by Joshbuehrle
How was your PVC valve bad a 4.0 dosnt have one it is built in to the valve cover and I already put a new fuel pressure regulator on it and I check fuel pressure it's correct and the map sensor is showing the right voltage I have spent some time on this and I just can't figure it out I even gasket and flow mached the intake runners when I did it
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#8
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Year: 1991
Model: Cherokee
Engine: 4.0
Yea that would cause some problems mine runs just fine it just is slower and you can feel that it wants to go faster it just feels like something is holding it back but it idles fine and dosnt miss or anything
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