21 replies to this topic

[BuckeyeSVT]

alex532, on 09 February 2012 - 08:34 PM, said:

ok, so tonight I had time to run the KOEO test again and the KOER test for the first time.

KOEO test codes:
176
543
172

KOER test codes:
172
136

Lots of lean codes based on codes posted for 1995 vehicles. I assume all the lean codes are the result of O2 sensors needing MIL eliminators since I have MSDS headers, so I guess I need to build the MIL eliminators that I bought the parts for. The 543 concerns me since this is a fuel pump open circuit code. What could be causing this? I was receiving this same code in my original posting, but I have since replaced the entire fuel pump assembly. I checked the wiring at the fuel pump and it didn't appear damaged. The hesitation I get periodically does seem consistent with the engine not getting fuel. Basically I'll go to accelerate and car starts to move and then stops and then a second later recovers and takes off.

Thanks,
Alex

That would be an incorrect assumption. Mil Eliminators only prevent the computer from seeing a problem with the catalyst - It has nothing to do with the mixture. You need to look closely at the Intake Manifold gaskets, the fuel injector lower seals (rail to lower manifold) and any outside leaks (i.e. vacuum and PCV connections). Those are your leak points. Also check the fuel pressure and make sure that it's correct at idle and also under load.

-Dom

[alex532]

Thanks for the reply.

I searched the internet for all the gaskets and seals I'd need to replace on my way to the injector seals and it looks like I can get all of them for close to $100. That doesn't seem horrible, but I'd prefer not to replace them unless I have to. All of the gaskets have about 50k miles on them and they are about 4 years old, would you expect them to be bad already? Is there a test I can do to verify the seals need to be replaced?

I replaced the PCV valve with a motorcraft one about 6 months ago and replaced the lines too(got some nice used ones from junk yard).

Thanks,
Alex