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· Registered
16 Posts
Discussion Starter · #1 ·
Hello everyone. I'm new here so bare with me but I will be extremely grateful for any help I receive.

I got my 2004 GT about a month ago and it has roughly 190,000 miles on it. It started with code 0301 (misfire on cylinder 1) so I replaced the coil and plug, problem solved.

Shortly after it threw code p2195 (Bank 1 Sensor 1 Stuck/lean) and started idling pretty rough at stops. After reading a bunch of forms I was pretty convinced the rough idle was a misfire so I replaced all the coils and plugs and had no results. A family friend replaced both sensors on bank 1 and the code went away and the car was running normal, (no rough idle).

A few hours after I got rid of code 2195, code 401 pops up (egr insufficient flow) and the rough idle comes back. What I found was a brittle egr vacuum hose taped together so I replaced it with a soft line, deleted the code, and it hasn't come back. A significant amount of carbon did fall out when I removed the line from the egr diaphram.

I went awhile without any check engine lights but recently I started throwing code 2270 (bank 1 sensor 2 stuck lean). This is one of the sensors that has been replaced.

Right now the car's idle has awful shaking and surging that gets worse with the a/c on. For the most part I don't feel it when the car starts rolling. I do not know what type of o2 sensors were put on the car but the family friend who builds drag racing engines and is a mechanic very familiar with fords said they were "racing o2 sensors" and they would work fine. So I didn't second guess it but probably should have figured out what brand they were now knowing that if they are bosch sensors my car wont like them.

If these were bosch o2 sensors would it cause my car to run this poorly?

Here's a list of what I've tried.

- new coils and plugs
- cleaned maf sensor
- replaced fuel filter
- checked for vac leaks with carb cleaner (I couldn't find anything)
- ran injector cleaner
- replaced the o2 sensors on bank 1

The car definitely had heavy modifications on it before but it looks like the previous owner put everything back to stock accept for the cold air intake and it is h piped. There is an extra pulley with nothing on it that looks like went to some kind of forced induction.

I'm stumped.

I don't want to bore everyone with too much writing so if you are missing any information that would be useful let me know!

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· Administrator
6,469 Posts
Hmmm, I never heard of "racing" o2 sensors, but then I don`t get out mucholdguy.gif
Welcome to the forums.

· Registered
50 Posts
I used to own a 2003 gt and it gave me similar issues. It was idling rough, misfired sitting at lights, loss of power, and I could smell fumes with the hood open and engine running. Threw code saying it had something to do with the egr valve so I cleaned it out and didn't help anything. Cleaned maf sensor, didn't do anything. I didn't have time to mess with it so took it to a family friend and it ended up being the exhaust manifold had came loose where it bolts to the block. Not sure if this is any help to you but it's worth a shot.
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