Having some issues I can't seem to fix on the 300zx. Post plennum pull the car seems to be missing its power and under acceleration it's just missing it's guts buts still drives reasonably. Checked for vacuum leaks and found none and set the idle via IACV screw to the correct setting. I'll attach a link to YouTube vid of the ecu talk program running. Can anyone give me there thoughts cheers. Details on the car: -1993 TT auto -plennum pull -egr delete -aiv delete Thanks guys
How can you hope to determine what's going on while you are revving the engine like that. You require steady increases/decreases in RPM. At least you had it at operating temperature. Do the TPS & Left O2 sensor voltages look right to you?
Basically removing coil pack connectors one at a time and watching for a drop in RPM. If you remove a connector from a functional cylinder this should produce a noticeable drop in RPM, if the cylinder is non functional there should be no change in RPM. I ask because a likely scenario is having left something disconnected.
I wonder if one of the plenum gaskets has started leaking. There's three - the upper plenum gasket and the two lower 'basket' gaskets... They're known to randomly start leaking esp. if you've been goofing with the plenum
Also as East Coast Z has pointed out, left O2 sensor value does not look right to me either. Agree also TPS voltage is not quite correct. Should be down near 0.45-0.5V... Indicates the TPS sensor is probably not set correctly. You should check to see if the car's even in hard idle switch on mode. There's a guide on youtube by TwinTurboTim that explains TPS setup very well.
Is it making boost under load? Could possibly be a vac line or 2 connected incorrectly. Been down that road myself.
