- Fri May 27, 2022 10:48 pm
#57166
Hi I have been running speeduino 0.4 board for quite some time and have been pleased with it,
Car ran fantastic great cold and hot starts smooth through out rev range.
But I have now developed a issue, I all seem to start when I had a headgasket failure (nothing to do with speeduino), Headgasket failure and blew water out of the header tank soaking the engine bay car dropped onto 2 cylinders just figured it was water on the plugs and leads etc after a mile or so she picked back up on all 4 cylinders..... nursed the car back home, the speeduino is mounted inside the car and did not see any water,
Did the headgasket and the engine had the issue below , I was planning a engine swap anyways,
so engine swap completed, did have a 4AGE in and now its running a blacktop zetec and the issues are the same.
she idles beautifully 600rpm 13.7 afr and revs clean to 2k, then she hits a wall sounds and feels like a soft limiter kicking in miss firing on all 4 cylinders.
when she does this stumble the tacho does not read properly. up to 2k the tacho mirrors the rpm in TS after the 2k TS rpms rise as they should but the tacho reads very low. eg 6k on TS only 2.5k on the tacho.
now occassionally the stumble is not there and she revs beautifully from idle to redline and when the stumble is not there the tacho works as it should. so when she miss fires the tacho is wrong, when she does not missfire the tacho is correct, is this connected?
on cranking the tacho jumps about and seem to jump more when you move the throttle (TPS)
other than the engine nothing has changed same harness etc....
did a tooth log nice clean signal, only get sync losses on crank (3) but none when running and missfiring
checked earths and feeds and harness is still running the same routes as before
Tried clearing eeprom and reflash the FW made no difference , sometimes runs like a top but more often than not has this huge stumble above 2k and tacho not reading correctly
changed plugs, leads, coil pack etc.....
any ideas
Car ran fantastic great cold and hot starts smooth through out rev range.
But I have now developed a issue, I all seem to start when I had a headgasket failure (nothing to do with speeduino), Headgasket failure and blew water out of the header tank soaking the engine bay car dropped onto 2 cylinders just figured it was water on the plugs and leads etc after a mile or so she picked back up on all 4 cylinders..... nursed the car back home, the speeduino is mounted inside the car and did not see any water,
Did the headgasket and the engine had the issue below , I was planning a engine swap anyways,
so engine swap completed, did have a 4AGE in and now its running a blacktop zetec and the issues are the same.
she idles beautifully 600rpm 13.7 afr and revs clean to 2k, then she hits a wall sounds and feels like a soft limiter kicking in miss firing on all 4 cylinders.
when she does this stumble the tacho does not read properly. up to 2k the tacho mirrors the rpm in TS after the 2k TS rpms rise as they should but the tacho reads very low. eg 6k on TS only 2.5k on the tacho.
now occassionally the stumble is not there and she revs beautifully from idle to redline and when the stumble is not there the tacho works as it should. so when she miss fires the tacho is wrong, when she does not missfire the tacho is correct, is this connected?
on cranking the tacho jumps about and seem to jump more when you move the throttle (TPS)
other than the engine nothing has changed same harness etc....
did a tooth log nice clean signal, only get sync losses on crank (3) but none when running and missfiring
checked earths and feeds and harness is still running the same routes as before
Tried clearing eeprom and reflash the FW made no difference , sometimes runs like a top but more often than not has this huge stumble above 2k and tacho not reading correctly
changed plugs, leads, coil pack etc.....
any ideas
- By hoopstar