XJ idles fine but sputters when accellerating

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Jul 21, 2009 | 08:32 PM

bornwinnr

Thread Starter

Newbie

Joined: Jul 2009

Posts: 5

Likes: 0

Model: Cherokee

XJ idles fine but sputters when accellerating

I just finished swapping an 87 4.0 into my 89 xj, which had a 4.0. The issue that I am having is that it idles fine, but sputters when I try to accelerate. If I floor it, it will eventually smooth out. If I let off and try to accelerate again it sputters. Any ideas?

Thanks in advance.

Jul 22, 2009 | 09:05 AM

Jason248

Junior Member

Joined: Jul 2009

Posts: 56

Likes: 0

From: Fort Lauderdale, FL

Year: 1994

Model: Cherokee

Engine: 4.0

did you keep the old sensors from your 89 motor?? if so try swaping out the throttle position sensor and see what happends

Jul 22, 2009 | 09:11 AM

BlueXJ

Renix Super Guru

Joined: Mar 2008

Posts: 24,653

Likes: 19

From: In yourz postez fissin jurr spelinzs

Year: 1990XJ/1989MJ

Model: Comanche

Engine: 4.0L Renix

TPS and O2 sensors are the main reasons for sputtering if the ignition is up to par. Idle would be the IAC.

Jul 22, 2009 | 04:18 PM

syncview

Seasoned Member

Joined: May 2009

Posts: 339

Likes: 4

Year: 1996

Model: Cherokee

Engine: 4.0L

Offtopic but: What exactly do you people mean by sputter?
Mine has started to do something like this: When ever I floor it, it kinda dies.. and then wakes up and goes BONKERS.. zooooom! Is this sputtering?