2.5 rough idle and other issues - Jeep Wrangler Forum

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Old 05-08-2011, 10:57 AM
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Join Date: May 2011
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2.5 rough idle and other issues

hello all, I'm new to this forum and could sure use some help. problems on a 97 wrangler 2.5L.

I've replaced the o2 sensors, put in pulstar spark plugs (problems existed before the plug install and after), has fairly new plug wires, new dist cap and rotor, cleaned throttle body, and installed 4 new injectors. Also added a spectre aftermarket air filter to gain a little air flow.

150k miles on it.

it's giving a front o2 sensor code again, rough idle, (when idle and in gear it will drop in oil pressure until the "check gauges" light comes on). but the main issue is the rough idle. since the o2s sensor is new i'm thinking something else is causing it to glaze over and give bad readings. engine may also have a little exhaust manifold leak since i've noticed one of the exh manifold bolts is missing in the front. Car is hard to start, it always starts, just takes a little more cranking than it should, even if you turn the key and let it sit before engaging starter.

little black smoke at start up only. has an exhaust smell too. When I say rough idle, I mean it is running rough at idle, but it's also not right at higher rpms either. poor fuel economy too.

where should I look now?
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Old 05-08-2011, 01:01 PM   #2
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You will want to post this in the TJ Wrangler forum section under Tech Forums. This section is for ?'s regarding the site itself.
Welcome to WF

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Old 05-11-2011, 11:26 PM   #3

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Get some throttle body cleaner, remove the air cleaner spray into the slot toward the firewall, use your hand to adjust throttle so it doesn't stall. It worked for me.
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