Turbo 3800 issues

[1quick]

But now that you mention that, with the app that I'm using it shows the map sensor reading 10 (IIRC) I'd have to scan it again (I'm not by the car) but could the map sensor be shot?

I would ask james that one im not sure, I think they read kpa and i dont remember the conversion for vacuum/boost to kpa

 

[Rent Free]

I doubt its CPS anyways since you say misfire AND lean. If it was just an ignition code or issue then maybe but misfire AND lean is ignition and fuel issue.

MAF further reinforces my thinking on this because if the car doesn't know what air is being metered coming in its going to stumble and the computer will add timing and fuel to compensate to keep it running.

Basically the ignition and fuel is fighting the air that doesn't sound like its being metered to keep it running.

Air/Fuel/Spark. Got fuel and spark codes.... misfire and lean. But that stumbleing and misfire and lean is the computer compensating all over the place by adding and taking away fuel or timing.

Does it idle ok but stumbles when you rev it or idle like hell but smooths out when you rev it?

Someone else on the 1st page I think said to try rubbing alcohol and a qtip to clean filament on the MAF too. See if that would make any noticeable difference? At least that's something to do easily and basically free to try.

 

[SaturdaysGS]

My MAF is close to my throttle body (one coupler connecting MAF to throttle body), so I'm assuming that anything pre MAF (if there was a torn coupler) wouldn't really matter, except under boost I'd have a boost leak..

 

[Turbocharged400sbc]

Some PIDs are actually manifold pressure in negative/-psi

 

[SaturdaysGS]

Some PIDs are actually manifold pressure in negative/-psi

Even if it was -10, does the MAP only read that low? Why wouldn't it mimic my vac/boost gauge?

 

[b4black]

You vac gauge likely reads in inHG. (Boost is psi) They are different units below and above zero.