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Discussion Starter #1
I just bought a 02 sxt quad cab 5.9... its got a couple problems
that being said,
1)im getting around 9-10 mpg.
I knew mileage would be bad, just not this bad.
anyone else with a 5.9 quad cab that could tell me their
mileage? or if this is average mileage for this engine?
2)my engine light came on last week.
ever since then my trucks been completely cutting out,
shutting off randomly. Both in park in my driveway letting her
warm up, and at about 1600rpm doing 45mph. She completely
shuts off and rolls, no lights come up on the dash, and all my
lights(inside and outside) stay the same.
previous owner gave me plug wires that he was going to do
but never got around to it, I also just got plugs to change too
but haven't done it yet. has anyone had this happen? heard of
this happening? or have any idea as to what it could be?
3) I was doing around 40mph and jumped on the gas to test
her out. I got up to around 60 and she started chugging/hiccupping/
bogging really rough, I immediately let off the gas and slowed down,
but have no idea as to whats wrong.
4) we ran codes on the light, came up as o2 sensor,
catalytic converter, engine misfire in #2,#3,#4, and engine oil leak into fuel.

any help is appreciated, Thanks Ben
 

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welcome to the site and congrats on the new truck. once you get these issues straight then im sure it'll be a great truck for you.
-The first thing I would do is disconnect the battery so the ecm will reset. and then replace the plugs wires and plugs. as well as the cap and rotor. and also remove the throttle body and clean it very well, don't forget to clean the iac valve and ports too.
See how it runs after that. keep us posted.
 

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Discussion Starter #3
welcome to the site and congrats on the new truck. once you get these issues straight then im sure it'll be a great truck for you.
-The first thing I would do is disconnect the battery so the ecm will reset. and then replace the plugs wires and plugs. as well as the cap and rotor. and also remove the throttle body and clean it very well, don't forget to clean the iac valve and ports too.
See how it runs after that. keep us posted.
Thanks ! I appreciate it, I'll will
do all of the follow by Saturday, but how
hard would it be to clean the throttle body ?
Thanks Ben
 

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not very hard at all. you'll need to get a new gasket (normally around $5). youll just take your air hood off. take a good look how your throttle linkage is set up before removing them (I normally take a pic with my cell incase I need a reference when I put it back together) and they just kinda clip or slide on. and unclip all you sensors. and then remove the 4 bots on top of the throttle body (1/2" I believe). the iac is on the back of the throttle body. that is held in with two t20 torx screws. you can clean the tip of the iac but do not push the plunger in or out. and the map senor is on the front (held in with two t20 torx screws) and then clean the whole throttle body and ports with carb/throttle cleaner and a brush.
 
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