Help..my 300zx is dying!!

[mustang_piston]

Maybe vacuum leak near Idle air control unit (back of engine).White smoke..no sweet smell. Getting worse.Car engine shakes so much that it shakes the car. two weeks been bad...just started.. going down hill fast.Accelerate from dead stop dies sometimes.High rpms in park then let off..dies sometimes.My idea power transistor.just touch injector wires and car boggs down...brittle harness may need change.I drove 15 miles and parked smelled BAD!!! like hot bad..Cold then i start up testing the engine in park..smell lots of fuel. came back to test..and wheeewww fuel smell alright. Engine in low idle ..not idle irratic..just the engine shakes a lot and sounds like a diesle. Louder then normal. Like maybe one injector not working. With all the infoI gave..can you help!! Thank you.

[jEzTeR]

Yeah sounds like bad news!

Have it checked out and get a compression test.

[Justin_K]

I don't know if you have the same problem but in my 240sx I had the exact same problem after changing 2 leaky injectors. Turned out 1 of the BRAND NEW injectors had a problem and was POURING gas into the combustion chamber so much that it dropped 1/4 tank in 15 miles. I had to drive 30 miles to get home and checked the oil the next day and had AT LEAST a quart of fuel in the oil. After I fixed it I took it for a test drive, it smoked so much when I pulled out of my driveway I thought I left a puddle in the road. Within the first 1/2 mile all smoking was done and it ran great. Just make sure to check your oil, don't want to lose the engine over an injector. Hope I was some help.

[gpelite]

Never had a stalling problem, but I nipped my problem when I took the Z in after I first bought her for a check up. Major gas smell, but no leakage and good fuel pressure

2 dead injectors, farthest away from intake, I want to say 5 and 6

its possible you have leaking, non working, or just bad injectors that is causing your MAF to send readings that are not being met with the right amount of fuel by your injectors and that could be the stalling

Like I said, I got to the problem earlier so I don't know what the bad side is

Also do you have an aftermarket air filter/pop charger? turbulance on the MAF like someone mentioned on here can cause inaccurate readings and some stalls from high flow