engine problem revised

Swamprat

NAXJA Forum User

Location

little Tijuana

• Nov 25, 2008

• #1

ok now im sure this is my injectors being fouled thats causing this. my jeep was barely idling, runs super rough. and drinks gas! has anyone have this same problem? or same symptoms but diferent reason?

 

casm

NAXJA Forum User

Location

Oklahoma

• Nov 25, 2008

• #2

Swamprat said:

ok now im sure this is my injectors being fouled thats causing this. my jeep was barely idling, runs super rough. and drinks gas! has anyone have this same problem? or same symptoms but diferent reason?

Click to expand...

Refresh our memories - what year is this XJ?

There're a number of things that could be causing these symptoms, but more info would help to nail the issue down.

 

Swamprat

NAXJA Forum User

Location

little Tijuana

• Nov 26, 2008

• #3

91 4.0 HO

i did find there is a loud hissing sound from the injector area of the 2nd cylinder.

 

B

birchlakeXJ

NAXJA Forum User

Location

Melrose, MN

• Nov 26, 2008

• #4

Any check engine light? If so, pull codes. Pulling the injector is pretty easy; if you have isolated the problem with the hissing sound, yea....start there.

 

Swamprat

NAXJA Forum User

Location

little Tijuana

• Nov 26, 2008

• #5

no check engine light, and the only code i got was 55. so theres no problem there. im going to replace the injector on the 2nd cyl. and see if that fixes the hissing sound

 

4

4wheelnfun

NAXJA Forum User

Location

Up-State New York

• Nov 26, 2008

• #6

THe Hissing sound you describe sounds like a vacuum leak.

You could have a damaged O-ring that seals the injector to the intake manifold.

Check out this web site on trouble shooting with a vacuum gauge.

http://autospeed.com/cms/A_2393/article.html

 

Swamprat

NAXJA Forum User

Location

little Tijuana

• Nov 29, 2008

• #7

after some careful deliberation, im starting to think the stumbling and hesitation is do to some thing in the fuel line. theres was little pressure in the fuel lines, when i replaced the fuel filter. and i didn;t know that the fuel pump/system was comtrolled by vacuum?

 

Last edited: Nov 29, 2008

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birchlakeXJ

NAXJA Forum User

Location

Melrose, MN

• Nov 29, 2008

• #8

Don't guess if you think you have a fuel delivery problem. Hook a fuel pressure gauge up to the schrader valve on the fuel rail. Take readings both running (dynamic) and not running (static). Compare your readings to factory specs.