speedysprocket

So I've been replacing one thing after another, and still having issues. I'm wondering if my ECU is at fault.
Replaced TPS, engine coolant temp sensor, MAP sensor, PIP, TFI module, and coil.
The original MAP sensor was causing the engine to run rough while cruising and idle poorly when warm and new MAP fixed that (problem also went away when the MAP was unplugged). Now that problem is back again and I just got the MAP on Friday.
The only code I get now while running is 41, lean. But the exhaust is sooty and my O2 sensor reads 1.3 volts when thoroughly warmed up, which is another concern for me.
Engine off test is tells me system pass first, then it tells me my MAP sensor is out of range again, and no speedometer input.
So is there an ECU issue that is also killing my MAP sensors? Something else maybe?
Thanks!

Aktech

Measure engine vacuum.

speedysprocket

For what? There aren't any leaks, I've checked that.

Aktech

Well keep throwing parts at it. U have a new chance on every part u throw at it.

speedysprocket

Should have just thrown a carb at it while I had the chance...
Anyone have ECU issue experience?

Aktech

U mite as well because u can't throw any of ur knowledge at it.

speedysprocket

So this turned from me asking for other people's EFI help to me having no knowledge?

Aktech

Well throw a ecu in it. Do u need help with injectors also(efi)? Don't sound like u know what it talking about. Yep, lack of knowledge. Ur (for what) sounded vary strong.

mark392001

Insufficient intake vacuum will cause what you're describing. Any vacuum leak either in lines, intake gaskets, will cause the level to drop. If you test the system running with a vacuum gauge and a T you may see an issue. You should be pulling off the top of my head 18-24hg or so, if you're on the low end of that it will cause the idle to deteriorate and the EEC to attempt to compensate. You can test almost on any connection, I normally use the EGR valve to hookup as it's right in front.

Aktech

So what was vac?