Cel Codes P0171 & P0134 On '98 Eclipse

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Cel Codes P0171 & P0134 On '98 Eclipse, check engine 171 134

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gary_jabo View Member Profile	Aug 23 2007, 07:57 PM Post #1
Member Group: Members Posts: 35 Joined: 13-August 05 Member No.: 14,025 Status: Location: Atlanta, GA Drives: 1997 Mitsubishi Eclipse 2.0L	Advice Please... I am getting CEL codes on my 1998 Eclipse L4 engine. Engine all stock execpt for DC sports 4-2-1 header which has been on the car for at least two years. Codes are P0171 - Fuel System Lean P0134 - Upstream O2 sensor Ckt no activity The engine gets great MPG and this problem just started happening. Alternator/battery voltage just fine when running. When driving I have an intermittent problem... As I'm driving the engine for no reason will cut out for a small fraction of a second. Not sure why but it's almost like the ECM just cuts out completely. The car looses power. The CEL which is on because of the codes flashes off for just about 1/4 second then comes on again. Tach drops instantly about 500 RPM, then returns to normal. Codes seem to indicate a bad O2 sensor, which is a good starting point. O2 sensor is old so changing it is not a big issue. I'll try a new fuel filter too, and clean the K&N air filter. Any other suggestions? The intermittent nature makes me think the ECM is flipping out. I'm going to clean all the contacts at the connector. What more can I do? Gary -- in really HOT-tlanta, GA -- 100 degree weather is no fun for car repair.

H473R View Member Profile	Aug 23 2007, 10:36 PM Post #2
Senior Group: Members Posts: 360 Joined: 20-July 07 Member No.: 42,458 Status: Location: Florida Drives: 1997 Mitsubishi Eclipse RS	QUOTE(gary_jabo @ Aug 23 2007, 07:57 PM) Gary -- in really HOT-tlanta, GA -- 100 degree weather is no fun for car repair. [right][snapback]109429[/snapback][/right] :amen: :amen: :amen: i live in florida and i feel ya on the heat. and hi :hyper:

ESchwanz View Member Profile	Aug 23 2007, 10:45 PM Post #3
Senior Group: Members Posts: 515 Joined: 20-February 07 Member No.: 35,807 Status: Location: USA, Minnesota Drives: 1997 GSX - 6 Bolt !!! ---(1999 Eclipse GS - OZ ** SOLD!!)	if your millage has gone to Sh** then it is most likely the o2... if it's not reading(the o2 sensor) it will think that the engine is running lean ... (thus the lean code) and dumps more fuel into the system. could be choking the car out and causing all yer problems. :thumbsup: :grin: its gotta be broken sensor or sensor wire

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