Hello all, I'm having a few problems with my Z. It's a stock l28 with a K&N intake from MSA and a 2 1/4 Flowmaster 40 exhaust. I wanted to ask for some advice before
I started blowing tons of money for replacement parts.
Here's a little back story with this particular Z:
Got the car a little over a year ago, it was running fine but I noticed that in lower rpm's it would kinda stutter. I decided to buy a fuel system cleaner but little
did I know that this would cause a whole world of trouble for me. After driving it around the car died, didn't stall or anything, it just kinda shut off and rolled on.
I had trouble starting it for the longest time and when I did, it would soon shut off after. I replaced the fuel filter thinking the fuel system cleaner was doing an awesome
job of cleaning everything. The filter was dirty of course, and I thought I had found the source of my problems but it didn't really get any better.
At this point, I took it to shop to get it repaired. The shop had the car a little over a month. They changed the spark plugs with NGK's the car still wouldn't start. They
thought it was the ECU because the injectors would stay open, flooding the engine. Instead of fixing the actual problem though, they did find other things to fix such as replacing
the rear output shaft seal, coolant temperature sensor, clutch slave cylinder, oil pan and valve cover gasket, and the oil filter. I took the car home and ended up dieing on the road
twice, not being able to turn the car back on unless I waited about 15 mins or so.
I then took the Z to a different shop and described the problem to them. After a few days they called to tell me that there wasn't anything they could find that was wrong with it.
I was really scratching my head and drove over to meet them. It turns out, the car would start up all the time with no problems and they actually drove the car for 108 miles total
without it dieing on them. I was happy as hell, I took the car home and started driving it daily.
It didn't take long before a new problem showed up. I'm noticing that the acceleration was really bad unless I floor it. I seem to be getting stutters or something, the exhaust will make
a small pop noise from time to time. At a light, I floored the gas pedal and maybe moved about 10 feet and then the car started to rev up really damn high. I checked out the fuel pressure
recently and it seemed to be pretty normal: 38 psi at idle and 30-33 psi while pressing the gas pedal. The battery checked out okay too, getting a reading of 12+ volts.
I'm kinda stumped now, the only thing I could think of now is a new ECU or a new AFM, anyone else agree?
Edit: Sorry keep getting AFM and MAF mixed together lol.