Help! Idling/Ignition troubles

[mabru]

I'm just about stumped. I have timing set at the proper marks, I have spark at all six plugs, and I definately have fuel. The ECU is reading a '55' on every diagnostic, my ignitor, my afm, and my CAS work in my friends RB20DET just fine.

I have cleaned out the AAC valve and can't find any vacuum leaks.

The only indications I get of any problems are that my car will not idle higher than a few hundred RPM and all 6 of my plugs foul up really quick. I have checked the ignition and CAS harnesses from the ECU and they check out good, so no breaks in the harnesses.

I'm starting to grasp at straws, I'm going to ohm out the AFM harness in the morning and work from there. Has anyone ever seen anything like this before? I'm going nuts.

Thanks for any input,

-Matt

[blind_elk]

Your components work on your friend's engine, do his components cause the same problems on your engine?

What is the fuel pressure?

Have you had the injectors cleaned?

Check the water temp sensor (disconnect it - does anything change?). Swap it with your friend's.

Check the Air Regulator (under the throttle body)

[mabru]

I know it has to be something stupid, we performed a cam swap and of course had to remove several vacuum lines and sensor harnesses to tear down the top end. After the swap I get no idle and plug fouling on all 6. I'll recheck fuel pressure and look at the air reg and do some more component swaps.

Thanks,

-Matt

[mabru]

Quick update (and shameless bump), the ECU has finally spit out an error code, it points to the water temp sensor.

I'm not exactly sure a water temp sensor will cause my problems but I'll swap it out and keep checking.

-Matt

[Craved]

i have similar issue, but opposite - my r33 run lean on idle and stalls

i even disconnected the CAS and injectors and AFM and my ECU read 55.. so it obviously doesn't tell you too much!

are you running standard ECU with those cams? are they standard cams or larger ones?

[mabru]

I am running the standard ECU. The cams are RB26 cams so yes, they have more lift and very little change in duration.

-Matt

[Sumo]

Of course the ECU looks at the water temp..... How do you think it knows to up the idle of a morning?