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Engine issues

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Jonny Jeep
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Joined: 19 Feb 2007
Location: UK

PostPosted: Tue May 01, 2007 11:05 am    Post subject: Reply with quote

Quote:
After about 5 minutes of warm up, runs like a champ, idles fine. If I try and drive before that, it bucks and kicks, and almost stalls but never accually stalls.


Exactly the same way my 4.0 acted when the upstream O2 went bad. When the O2 sensor went bad it did NOT throw a code.

When my TPS went bad the revs were bouncing up and down at idle, and sometimes revving high between gear changes. Up to about 2k revs. The TPS threw a code!

So I still say upstream O2 sensor.
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blktrax
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Joined: 01 May 2007

PostPosted: Wed May 02, 2007 5:43 am    Post subject: Reply with quote

*EDIT* Have now changed Upstream O2 Sensor and Coolant Sensor (Had a voltage high code stored) STILL having the same cold startup issue.

Changed: Plugs, Wires, Cap, Rotor

Cleaned: Throttle Body

2 Diffrent brands of fuel.

2 bottles of Gumout fuel system cleaner.

After about 5 minutes of warm up, runs like a champ, idles fine. If I try and drive before that, it bucks and kicks, and almost stalls but never accually stalls.
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blktrax
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Joined: 01 May 2007

PostPosted: Thu May 10, 2007 10:43 am    Post subject: Reply with quote

Changed downstream O2 sensor

TPS Sensor

Idle Air Control Valve

Still has off idle hesitation at dead cold, occasionaly stumbles off idle.

I guess on to the fuel system.
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dewey962
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Joined: 14 Nov 2005
Location: Aurora, IL

PostPosted: Sat May 19, 2007 5:46 pm    Post subject: Reply with quote

Well mine started to do it all the time so I got lazy and to it to a mechanic. $214 later he changed the O2 sensor and now it runs fine. Should have done it myself and saved a ton but oh well.
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JBE
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Joined: 20 Apr 2007

PostPosted: Mon May 21, 2007 11:43 am    Post subject: Reply with quote

After trying all of the above except the O2 sensors, including the crank sensor, I finally had both O2 sensors replaced and my problem went away. Very Happy
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