I have a 1992 Acura integra with a b20b swap. The guy before me had it running a chipped p72 ECU. I recently ran into a problem where the 10A ECU fuse would blow and cause the car not to start, so I used a 20A to see if that would work so I could get home and it did. So I changed the ECU to the stock PR4. Would any problems have been made from running that P72? I heard that running a P72 on a b20b will run j to problems, doesn't anyone know if any permanent damage to anything could have been made?

 

Shouldn't have anything to do with blowing fuses, you have something shorted somewhere if it did. Should throw a code or two unless it was chipped specifically for the non vtec motor.

Putting larger than rated fuses in circuits is not a fix btw, just a fast way to destroy electronics and/or wiring. Pretty sure the ecu circuit is 15A though.

 

Well it definitely was the source of the fuse blowing because I changed the ECU to the PR4 and it is fine now with the 10A fuse on there. And on the diagram it definitely says 10A for the ECU.

 

I have seen this a few times. The ecu has an internal short which causes the fuse to blow.

 

So it's the ECU that's bad? And what would be the best ECU to run a Non-Vtec B20B with a ls trans?

 

If it's a stock ecu, a P75 or a PR4 with a fuel pressure adjustment will make do. Alternatively, you can probably move your chip over to the replacement ecu.

I've yet to see an ecu fail in a way that shorts it out, but I stand corrected. I'd still go over your wiring (especially in that area) and make sure you don't have something else going on.

 

I mean if something else was going on, I think the fuse would be blowing with the stock PR4 that it's running now, but it's been fine.

 

The best ecu would be one mapped for your b20b motor from a reputable business. The p75 ecu with a higher fuel pressure will work but it's more of a "bandaid" fix.

If you can put a different ecu in the car without blowing the fuse I would lean towards the ecu being faulty. Like I said in my previous post, I have personally seen this before but it is a rare occasion.