Codes and d**n codes

[RemoW2112]

Back to the 95 I just got.
I have the cats bolted back on, new o2 sensors, fixed the stripped bolt hole on the intake for the upper intake bolt, new gasket for upper intake, plugs, wires, cap, rotor, #19 injectors, and an MSD coil.

Mods that I know about:
x302 heads
e303 cam
93 Cobra intake
K&N air filter
Trick flow elbow
BBK shorty headers

Car still won't idle right. It is loping at idle and surging a little bit. You can feel what I would describe as a miss up to 2k. I ran codes last night and get the following: KOEO 511, KOER 172, 136.

I don't believe the car has a chip in it. How do I check? From the research and searching I have done the engine seems to be using a value table instead of reading the O2 sensors to determine mixture. I have not found a definitive answer on how to fix the 172, 136 codes.

The EGR is disconnected from the exhaust but the EGR is still attached and hooked up to the throttle body. I capped the threaded end on the engine and EGR. I get no CEL light.

I have tried all the recommended items to even out idle. Clean the MAF, throttle body, etc. I have not messed with the TPS since it supposed to not need adjustment on 94-95 engines.

I am at a loss as what to try next, with the way the engine is idling there is no way it will pass emmisions. On an old school car I would swear I have a massive vacuum leak but if I do I can't find it.

Any suggestion on where I go from here?

Thanks all,
Dan...

 

[final5-0]

511 tells you something is stuck in the service port of the pcm

Grady

 

[Chythar]

The 94-95 computers are less flexible to engine mods than pre-94 computers. It really depends on the mods and how they all work together, but I've also heard of many idle issues with the Ford alphabet cams (b, e, etc). You may not be able to get a smooth idle unless you put a chip in the computer.

If I remember how the computer works, it always uses lookup tables based on sensor input. The O2 sensors come into play once the engine warms up, so the computer can balance the air/fuel mixture. Don't know if the O2's are used as inputs with the other sensors, or just a double-check to see if its lean, rich or just right. I can tell you that the a/f mix will obviously be off, since the lookup tables don't properly reflect the engine mods.

I'm guessing that the computer was able to adapt the fuel flow to get good results from the O2's, but it had to add fuel to compensate for the extra air flow from your mods. That's my guess on the error codes you have. Someone please correct me if my presumption is wrong.

 

[toyman]

511 tells you something is stuck in the service port of the pcm

Grady

That may be too subtle. To check if there is a chip you need to pull the ECU and see if one is installed in the service port. Code 511 is a read only memory test failure.