This one is stumping me. 1998 2.5 5spd 116k. I get check engine light only when I get below 1/3rd of a tank of gas. The codes vary - P0174, P0171, P0420. I get P0174 more often than the others. MAS is new, O2 upper bank 1 is new with in the past 6 months. Anyone have any ideas?
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po174
- Thread starter drunkle
- Start date
[FONT=arial,verdana,helvetica,sans-serif]P0171[/FONT][FONT=arial,verdana,helvetica,sans-serif]System Too Lean - Bank No. 1. [/FONT]
[FONT=arial,verdana,helvetica,sans-serif]P0174[/FONT][FONT=arial,verdana,helvetica,sans-serif]System Too Lean - Bank No. 2. [/FONT]
[FONT=arial,verdana,helvetica,sans-serif]P0420[/FONT][FONT=arial,verdana,helvetica,sans-serif]Catalyst System Efficiency below Limit - Bank No 1. [/FONT]
and you say that the maf is new? I would start checking for a vacuum leak. if you haven't change the gas and air filter that wouldn't hurt either.
[FONT=arial,verdana,helvetica,sans-serif]P0174[/FONT][FONT=arial,verdana,helvetica,sans-serif]System Too Lean - Bank No. 2. [/FONT]
[FONT=arial,verdana,helvetica,sans-serif]P0420[/FONT][FONT=arial,verdana,helvetica,sans-serif]Catalyst System Efficiency below Limit - Bank No 1. [/FONT]
and you say that the maf is new? I would start checking for a vacuum leak. if you haven't change the gas and air filter that wouldn't hurt either.
what year and engine? mods?
well I was thinking it could be like the 2k's that have the fuel pump sock clog and that will cause problem below 1/4 of a tank ...
where did you get the replacment maf?
where did you get the replacment maf?
well missing and hesitation could be plugs and wires. was there a code for the MAF? the fact that it isn't oem might be the problem ...
typically a p0171 and p0174 together means that the maf needs to be cleaned or there is a vacuum leak.
I'm pretty shure the MAS was bad but it looks like it was hiding this second problem. I think I'm going to drop the tank and looks inside. a cloged sock makes since to me. The car could be running lean once I get to that point. The car used to be in western PA when they had a bad batch of gas at a lot of stations. I had several freinds who had problems resulting cloged pumps. I'm not sure when filter was last changed. I'll do that first and see what happens.
you dont have to drop the tank. remove the rear seat and there is a access to the fuel pump. you migh need to cut the body and bend the sheet metal back to get the pump out but its much better then dropping the tank.