AFE cold air intake installed, check engine light comes on

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cherokee chuck

NAXJA Forum User

Location

freeland,wa usa

• Jul 27, 2008

• #1

:dunno: :dunno: My son installed an AFE cold air intake on his 95 4.0, it was o.k. untill he replaced the exhaust & removed the collapsed cat[no green lectures please, it's a trail rig & I didn't do it anyway] & now the check engine light comes on after a few minutes & it feels like it's starving for air at higher rpms.I ran a search before this post but I know there must be a thread on this somewhere.

 

Last edited: Jul 27, 2008

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bucketoXJ

NAXJA Forum User

Location

Illinois

• Jul 27, 2008

• #2

most likely an o2 sensor issue...sounds like it leaning out the mix too much...
technically im a noob on this forum si i wouldn't trust myself unless someone else backs it up

 

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1FASTXJ

NAXJA Forum User

Location

Denver, CO

• Jul 27, 2008

• #3

My 96 had an O2 sensor right at the cat (and the exhaust manifold). Do you remember unplugging anything pullin it off? My bro had a 95 and drilled out the cat and it ran like a dream. It sounds like the computer's getting a bad signal. I hate to sound like a monkey but have you checked that all the sensors are hooked back up? That's all I can think of.

 

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Cfunnk

NAXJA Forum User

Location

South-West Pennsylvania

• Jul 27, 2008

• #4

I don't think its the o2 sensor. I have a 96 4.0 aftermarket exhaust, and I haven't had my down flow o2 sensor plugged in in over 2yrs. I had a similar problem before, turned out to be fuel injectors electrical jack not seated all the way on 2 of them. But hey, every situation is different so who knows.

 

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badron

NAXJA Forum User

Location

Ohio

• Jul 28, 2008

• #5

Pull code or have code pulled and start from there.

 

asp

NAXJA Forum User

Location

Westport, MA

• Jul 28, 2008

• #6

badron said:

Pull code or have code pulled and start from there.

Click to expand...

have fun with that. it's OBDI

 

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frank36

NAXJA Forum User

Location

Pennsylvania

• Jul 28, 2008

• #7

asp387 said:

have fun with that. it's OBDI

Click to expand...

It's just as easy as OBDII,the DLC is out under the hood on the left side fenderwell.Or turn the key on and off 3 times.

 

asp

NAXJA Forum User

Location

Westport, MA

• Jul 28, 2008

• #8

i thought you had to bring it to a dealer and it costs a lot more $...? i've never done it, so i might be wrong.

 

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cherokee chuck

NAXJA Forum User

Location

freeland,wa usa

• Jul 30, 2008

• #9

:cheers: Thanks for the input people. Tested the O2 sensor & that was the problem. Evidently just pulling it out of the old head pipe & installing it in the new one was enough to make it go bad.