Randomly dropping revs while driving, then won't start
Jul 15, 2021 20:30:42 GMT
wannabe, scottydugg, and 2 more like this
Post by atlex on Jul 15, 2021 20:30:42 GMT
I've already solved this problem but I'm putting here for the sake of content/discussion and other people searching for info.
This is in my 1989 NA6CE Eunos Roadster..
So I was driving along and not giving it that much right foot when twice in the space of a minute the rev counter dropped and the car 'lost power' but then suddenly it came back. It didn't lose revs - the engine kept turning, the car didn't stop it just didn't have ignition for 2-5 seconds. Like the fueling and ignition system had failed through lack of power.
I finished the journey without further issues and parked up. I thought it might be an earthing issue so retightened the battery posts. But when I tried to drive the car again... it wouldn't start!
I've seen this issue before and it's some lack of current issue through one of the relays. A relay has failed, causing another to buzz.
The buzzing came from under the dash (the big fuel pump relay) but it wasn't getting enough constant current to stay open, it was buzzing trying to make the contact. I've replaced this relay before and that didn't solve the problem.
The relay that had failed is the B6S8 relay in the engine bay. aka 'Fuel Inj'.
Luckily, this isn't my first time at the buzzer bingo relay rodeo. I actually keep a spare B6S8 in the car. 30 seconds later I swap it out...
Starts up like normal.
I understand this is actually down to me running a terribad ME221 ECU which doesn't quite drive the fuel system right, and I will rectify that at some point soon.
This is in my 1989 NA6CE Eunos Roadster..
So I was driving along and not giving it that much right foot when twice in the space of a minute the rev counter dropped and the car 'lost power' but then suddenly it came back. It didn't lose revs - the engine kept turning, the car didn't stop it just didn't have ignition for 2-5 seconds. Like the fueling and ignition system had failed through lack of power.
I finished the journey without further issues and parked up. I thought it might be an earthing issue so retightened the battery posts. But when I tried to drive the car again... it wouldn't start!
I've seen this issue before and it's some lack of current issue through one of the relays. A relay has failed, causing another to buzz.
The buzzing came from under the dash (the big fuel pump relay) but it wasn't getting enough constant current to stay open, it was buzzing trying to make the contact. I've replaced this relay before and that didn't solve the problem.
The relay that had failed is the B6S8 relay in the engine bay. aka 'Fuel Inj'.
Luckily, this isn't my first time at the buzzer bingo relay rodeo. I actually keep a spare B6S8 in the car. 30 seconds later I swap it out...
Starts up like normal.
I understand this is actually down to me running a terribad ME221 ECU which doesn't quite drive the fuel system right, and I will rectify that at some point soon.
le sigh