Ecu just replaced, still running rough Options

[CrypticDeity]

I just replaced the ECU and my car is running now. It's still running rough/shaking just like it did before the ECU died though. I am not driving it because I am worried something else might cause this ECU to break as well. Is the some type of voltage control module for it or something?

[bsamps4]

I'd be sure to check all you're grounds to make sure there isn't a short of some kind. Time to bust out the volt meter and get busy I'm afraid, but you also never mentioned the full story that led up to you changing the ECU. A full symptoms list is crucial to us helping you fix your problem.

[CrypticDeity]

Well it ran fine until one day it started running rough, stalled, then wouldn't start. The fuel pump wasn't getting power. I replaced it and it works again but is still rough. There really weren't any symptoms until just before it happened. It was a dry somewhat colder day but not colder than usual. Just filled tank with 87 octane. Had no prior work done to it. oil changed about 2000 miles beforehand. I need to get a carfax report still.

[CrypticDeity]

Oh yeah, when my ecu went, my battery did too.

[richee3]

I'd check power to the fuel pump. Sounds like a ground issue there, or a relay issue. Very possibly bad gas as well.

[CrypticDeity]

Okay so I took it for a test drive and it started doing the same thing, running rough, nearly stopping at anything under 3000 rpms. I haven't tried to start it yet. Going to give it a shot tomorrow.

[xrav22]

Okay so I took it for a test drive and it started doing the same thing, running rough, nearly stopping at anything under 3000 rpms. I haven't tried to start it yet. Going to give it a shot tomorrow.

Is your alternator on the way out? If it is your battery light will be on. Mine would idle like that when my alt went out. Also check your coolant temp sensor those things rust inside and make for hard starts and rough idles.

[CrypticDeity]

Is there like a 90amp alternator or bigger for this car? I plan on getting subs so I might as well get a bigger alternator now.

[CrypticDeity]

http://www.ebay.com/itm/1995-Toyota-Celica...#ht_1809wt_1163

Is that REALLY 90 amps or are they just bull****ting?
It seems I can get an 80 amp from the auto celica too?
It's for a 5sfe.

[mkernz22]

i just get an 80 amp from the auto and run a capacitor. the only high output alternator i've seen (for the 5s) is almost $250 something for maybe 150-200 amps. don't quote me though.

[CrypticDeity]

Do you need a different belt for the 80 amp?

[CrypticDeity]

Another question.. If I get a 160 amp alternator, will it always be drawing more amps? As in.. If it's nearly 100 amps more, will I always be losing 4 hp, or only when it needs it?