LITTLE ABOUT THE CAR:
Hello, currently own and love my 1987 325es. Every since i bought it, it has had a big exhaust leak. Was like that when i bought it, but my brother works at bondurant racing school in phoenix az, so i took my car up to the shop and we took out my whole exhaust. The person that owned the car before would go over speed bumps and all sorts fast and totally scrape and mess up the exhaust system. From the exhaust manifolds to the cat, it is all butchered and dented and welden and all that, quite crappy. But the back exhaust manifold connects to the downpipes for the most part, small gap though i believe. But the front exhaust manifold, there is like a 1 inch gap almost between downpipe. The exhaust is bent out of place, we couldnt get it to fit on there. Motormounts busted too about a month after i bought my car, engine slide over a little and pully grinded into lower radiator hose. Replaced motormounts, and hose, but engine still little crooked it seems. Passenger side motormount seems awfull slanted, and my brothers friend at bondurant said its crooked, as i noticed as well.
Well sometimes my car runs and seems almost perfectly normal, well normal from what i know of it. Car is very loud, but when it runs normal, seems to do ok. On the other hand, the car can run like complete shit. When it runs like crap, idle is very rough and stalls if i dont keep it at above idle RPM. and backfire's like all hell.
If i rev it up, and step on it, all this black exhaust comes out from the big leak in the engine bay, but the exhaust only seems to come out when the engine stumbles.
The engine stumble's a lot when it runs like crap, and like ill have it at 2000 rpm, then step on it. Engine stumple's all this black smoke comes up, then picks up again, but when i let off the gas, it backfires really loud.
THINGS I'VE REPLACED:
When i bought the car, the o2 cencor wire's wernt even connected. But today i just bought a new o2 cencor for it, and it really hasnt changed, it acually makes it run a little worse so it seems, but cant say that for sure, cause its only been a day.
coolant and flush multiple times
cleaned and regreased the K and N filter
lower coolant hose about 3 times
exhaust manifold gaskets ( exhaust manifold never came close enough together, they burned off)
Thats about all i can think of right now, I love my e30 to death, but its frustrating. Yes i am working on that exhaust problem, trying to get enough money to buy the shorty headers from seambmw.com, its about all i can afford.
I DESPERATLY need your guys' help, i would appreciate anything you may have to say, ill try to get some pictures up as well. please give all imput and advice, im desperate.
**sorry for all the mispells and all that, very tired and frustraited*