We had a dead cylinder a couple days ago and in all our testing we got down to the injectors and found "before" preignition, injectors 4 and 6 were on for some reason and maintaining 10v at all times. The rest of the injectors were seen with 3v but not always on such as 4 and 6.
If you look at the ECU wiring diagram, it's the only thing between the injectors and the ECU itself that is or could influence voltage.. that is unless we're clearly mistaken; this is very possible.
The ECU has had a JMS custom chip installed for roughly 4 weeks and when doing testing, we removed the chip and reinstalled the J4J1 by itself and the problem was still present (eliminating the chip theory).
As best as we figure, the ECU must be the culprit. What do you guys think?
If you look at the ECU wiring diagram, it's the only thing between the injectors and the ECU itself that is or could influence voltage.. that is unless we're clearly mistaken; this is very possible.
The ECU has had a JMS custom chip installed for roughly 4 weeks and when doing testing, we removed the chip and reinstalled the J4J1 by itself and the problem was still present (eliminating the chip theory).
As best as we figure, the ECU must be the culprit. What do you guys think?