It really is a crap shoot trying to figure out how may injectors are dead when you know at least 2 or 3 of them are not working properly. It took me 3 tries on my last 90Q to replace 4 bad injectors. The engine was running so bad even a power balance test didn't give any meaningful data. The sure fire fix ifor the stealership is to remove the plenum one time and replace all 8 of them. Unfortunately it's also the most expensive option. For $6000 they must be replacing everything under the plenum.
jonovitch wrote:.....ran great for about 200 miles then all hell broke loose..... the car smells like its burning rich and while driving it hickups and feels like it is not getting enough fuel. At low speeds it will just die but starts up easy......
Ohm your injectors and knock sensors first but from your description you may also be having MAF issues. Is the check engine light (CEL) on? If so your next step would be to pull codes off the ECU. Instructions are in the tech help section at Q45.org.
Back to the MAF....Start by checking the connector and the MAF pins. Are they corrosion free? If not, clean with electrical parts cleaner or penetrant and coat with dielectric grease. Are the connector pins tight? They should look like the middle pin in the pic and can be tightened with something as simple as a small nail. When you reconnect to the MAF it should wiggle up and down very little (1/8").
If the MAF connector is dirty you've got to suspect that other connectors will have the same issue. Clean them all.
As long as you already own a voltmeter you've gotten off pretty cheap so far. Let us know what you find. Welcome to NICO.