Heres my problem, i have a 91' Z32 n/a
I all of a sudden started loosing horsepower, my exhaust has holes in it but that was like that when i bought it, so i don't think thats the reason. it also sounds a little weak on startup and after startup until its warmed up it idles around the 500 range when it used to idle around the 8-9 hundred range, and when i try to get on it rpm rises correctly but the engine doesn't sound its happiest louder than usual, i'm not a moron i've tried a few things the oil is fine just changed not long ago, i've changed the fuel filter, everything fluid wise seems fine, but i'm definately loosing horsepower. i wanna lean towards a fuel problem, i thought maybe bad gas, but i'm starting to think its more than that. if anyone can give me some advice it'd be much appreciated.

 

Maybe the alt or alt belt?

 

gas won't go bad for around a year usually. a little less sometimes, but it's probably not your problem. are you getting any shaking or a very putsy exhaust sounds? do a balance test (pulling each coil pack individually and seeing if one doesn't make the idle go down. they should each make the idle go down. if one doesn't then that cylinder isn't firing) and see if you have a dead cylinder.

 

second the test ^^^^ might have a bum coil pack/ spark plug/ injector. or just a bad connection even.

 

could be a faulty temp sensor too keeping you on a closed loop fuel map just a thought

 

I appreciate the input i'll try the balance test first see where that gets me, thanks.

 

Ok. i pulled the ignition coils and found that the forward left and right i think its the one and two cylinders aren't working, i'm assuming those coil packs are failed, but why would they both stop working at one time???

 

don't assume figure it out! unplug and remove the coil pack, stick a not used spark plug in it start the car round the plug and see if they spark. more likely the injector/s are dead compared to the coil pack

 

Have you pulled codes?