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Unread 03-04-2013, 04:09 PM   #1
ZB_WJ
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4.0 fuel injector upgrade 4.0

Jeep is running sluggish, Mpgs 14.3 highway. I'm thinking fuel filter or pump/screen. But with under 100k does this sound right? Jeep lacks power on hills and almost seems like Rear break dragging, there is a clink coming from around that area, but nothing has locked up or smoking. Main problem is on hills, this thing is a dog. On BB with 245/75r16s and wouldn't think they would hurt me that bad.

Ive searched to find the thread that says what injectors to use to upgrade and was asking for your input? I've heard neon injectors are the way to go but don't know what year/model I can use.

Are there better injectors to use? Or w
Should I start worth fuel filter?

Any help is merited with a digital pat on the back

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Unread 03-04-2013, 04:16 PM   #2
Umbrella
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Saw this post: LINK

Used injectors from a Taurus.
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Unread 03-04-2013, 04:36 PM   #3
ZB_WJ
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Yup saw that one and will probably go that route, But was wondering about any better ones?
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Unread 03-04-2013, 05:50 PM   #4
shockracer
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If you could find an early 95 neon, they had a 5 hole injectors.
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Unread 03-04-2013, 06:00 PM   #5
wvracer821
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i used ones from a mustang. i did a write up on it. it was okay for a replacement but nothing fantastically better than stock.
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Unread 03-05-2013, 12:03 PM   #6
ZB_WJ
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Ok, thanks for the input guys. If my fuel filter doesn't fix my sluggishness then I'm def going to upgrade injectors. I wouldn't think they'd be bad, only about 92k miles on it
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Unread 03-05-2013, 06:53 PM   #7
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If you have a 4.0 I-6, carefully check the fuel injector wiring harness; follow it from the front of the valve cover to the rear of the engine....There is a cylinder head stud/bolt head at the very back of the engine (drivers side behind valve cover) this stud/bolt head rubs through the harness, short circuits the wires and causes rough idle, bucking, misfires, hesitation and random codes. The symptoms sometimes begin after the engine is hot or has been running on the highway for awhile, and often come and go...It will take more than just a quick visual inspection....If the harness is resting upon this stud (or near it for that matter), if you don't allready have this problem eventually you will. I repaired the wire, wrapped the entire in harness in nylon loom, and put piece of vacuum hose over that stud...problems solved...
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Unread 03-05-2013, 08:33 PM   #8
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Quote:
Originally Posted by cjcyr8 View Post
If you have a 4.0 I-6, carefully check the fuel injector wiring harness; follow it from the front of the valve cover to the rear of the engine....There is a cylinder head stud/bolt head at the very back of the engine (drivers side behind valve cover) this stud/bolt head rubs through the harness, short circuits the wires and causes rough idle, bucking, misfires, hesitation and random codes. The symptoms sometimes begin after the engine is hot or has been running on the highway for awhile, and often come and go...It will take more than just a quick visual inspection....If the harness is resting upon this stud (or near it for that matter), if you don't allready have this problem eventually you will. I repaired the wire, wrapped the entire in harness in nylon loom, and put piece of vacuum hose over that stud...problems solved...
......ive been trying to track the same problems for a year ill be looking at this tomorrow.
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Unread 03-06-2013, 12:00 AM   #9
99WJ539918
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Quote:
Originally Posted by cjcyr8 View Post
If you have a 4.0 I-6, carefully check the fuel injector wiring harness; follow it from the front of the valve cover to the rear of the engine....There is a cylinder head stud/bolt head at the very back of the engine (drivers side behind valve cover) this stud/bolt head rubs through the harness, short circuits the wires and causes rough idle, bucking, misfires, hesitation and random codes. The symptoms sometimes begin after the engine is hot or has been running on the highway for awhile, and often come and go...It will take more than just a quick visual inspection....If the harness is resting upon this stud (or near it for that matter), if you don't allready have this problem eventually you will. I repaired the wire, wrapped the entire in harness in nylon loom, and put piece of vacuum hose over that stud...problems solved...

+1 - a very common driveability issue I ran into at the dealership. Wires would rub the stud and short to ground on the block. The stud is on the back driver's side of the valve cover. I used a rubber hose to cover mine and it's been fine for years.
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Unread 03-06-2013, 06:30 AM   #10
ZB_WJ
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Quote:
Originally Posted by cjcyr8
If you have a 4.0 I-6, carefully check the fuel injector wiring harness; follow it from the front of the valve cover to the rear of the engine....There is a cylinder head stud/bolt head at the very back of the engine (drivers side behind valve cover) this stud/bolt head rubs through the harness, short circuits the wires and causes rough idle, bucking, misfires, hesitation and random codes. The symptoms sometimes begin after the engine is hot or has been running on the highway for awhile, and often come and go...It will take more than just a quick visual inspection....If the harness is resting upon this stud (or near it for that matter), if you don't allready have this problem eventually you will. I repaired the wire, wrapped the entire in harness in nylon loom, and put piece of vacuum hose over that stud...problems solved...
Thanks, funny thing is, I think I read that thread a long time ago. I'm not having any codes, bucking or known misfires. Its more sluggish and loss of power. I am definitely going to check that and put some hose or duct tape on the threads. I completely forgot to do that.
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