93 4.0 6 cyl...rough idle

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Aug 14, 2011 | 06:03 PM

93jeepster

Thread Starter

Newbie

Joined: Jul 2011

Posts: 4

Likes: 0

Model: Cherokee

93 4.0 6 cyl...rough idle

I have a rough idle in my 93 cherokee the idle shows right at 8 rpm

I have recently replaced the idle control valve, tps, and the coil and plugs

any other suggestions to assist would be greatly appreciated!!

Aug 14, 2011 | 06:18 PM

sv41878

Senior Member

Joined: Jun 2009

Posts: 670

Likes: 0

From: Central Pennsylvania

Year: 1989

Model: Cherokee (XJ)

Engine: 4.7 H.O.

Check for as vacuum leak, if that's not it, check your injectors. If one is stuck open, it will be dumping too much fuel. It's a tough call without hearing it, alot of variables come into play.

Aug 14, 2011 | 06:38 PM

trans_am7935

CF Veteran

Joined: May 2009

Posts: 1,844

Likes: 4

From: Glen Burnie, MD

Year: 1994

Model: Cherokee

Engine: 4.0 H.O. K&N, Borla headers, custom down pipe, magnaflow hi-flo cat, flowmaster to turn down tip

check for sensors upluged, bad ground connections. if all look good then seafoam the hell out of it!

Aug 14, 2011 | 07:03 PM

tjwalker

CF Veteran

Joined: Nov 2010

Posts: 5,841

Likes: 117

From: In the middle of Minnesota!

Year: 1999

Model: Cherokee

Engine: 4.0

1. Finish your tuneup with plug wires, distributor cap, rotor, fuel filter. Failing to freshen tuneup hardware when symptomatic can result in the chasing of your tail.

2. CLEAN your throttle body. They get very carboned up over time and miles and can leave you with some idle symptoms.