I have just put another 4age engine into my ae82 and it purred like a kitten for a frw weeks however the battery i had in it was farked and (don't ask me why) but i tryed starting it quite a few times on the farked batt, i have since tryed the batt out of another car(fully charged and in good working order) and now the rolla work start via the key... It will start when i roll start her but it runs poorly and i have noticed that the tacho(in dash one) behaves weirdly(shows less revs when i rev it) it also when engine is stoped and i go to start her i have noticed that the engine light and oil light are dim as i turn keto pre start position... I am thinking i might have damaged the ecu from trying to s atart her with a farked batt... Any ideas ??? Maybe a bad connection or a fuse or am i right with the ecu?

Sorry about typo's :)

It sounds like your alternator is the problem, you can get it tested at just bout any auto store.

i can put the multimeter on it but i don't think that would be the prob as the good batt that i put in there was outa my every day driver with hi cca batt outa a volvo 760 ... And.that batt has no probs turning over a v6 (taken straight out of volvo and into rolla and wont turn it over... I have thought might he starter but the fact that the starting prob started at same time as tacho and running issuses started at same time

I sould also note that the old rolla batt was farked long before the ned engine went in as i used to use it for the electric motor on my boat when the rolla was off road with old farked engine in it( bout 6-8months) the rolla didnt killed old batt... I did;)

Well i managed to get hold of another ecu to try out and didnt do squat... So going to check every fuse relay and connection.... Again...

This has saved my ass many a time.

 

http://mitchee.com/ae82/4A-GEManual.pdf

Link comes up forbidden to me

On your phone? If so its a link to a PDF of a 4AGE diagnostic manual. So good.

Ok after many hours checking fuses, relays and connections i finilly found to prob... And geez do i feal like a noob... Bad engine earth /cry