Hi All,
Just looking for guidance/advice on a issue that we have been chasing. It was intermittent at first but now seems more frequent but we can't seem to get a handle on the cause.
We are running SD2 with a wideband. Car runs great but a on a few 1/4 mile runs we see the ECM freakout and all the ECM related parameters go to zero enough to shut the car down momentarily during a run.
What is interesting is that the non-ECM connected parameters like the wideband and MAP signals do not go to zero at the same time the other parameters do.
Attached is a snapshot of the WOT portion of the run. The log shows the dip down to zero around the 5700 mark of 3rd gear.
This is a pretty fresh build and we were pretty meticulous with the installation of everything since we have done this a few times already.
One of the early ideas was that this was an alternator issue. We swapped in a known good alternator and the issue was still there. We also removed the voltage booster thing. The logs show a steady voltage throughout the run as well.
The issue hinted as something electrical, so we swapped out ECMs to try and isolate where it is but the same problem occurred. We are about to go into the wiring next but was hoping this has been seen (and solved) previously. The case of the ECM is grounded to the chassis, and the engine ground are clean, we also used the casper's ground kit.
If it hasn't been seen before, then we are open to ideas on what to check or areas that are marginal and could be of concern.
Mike
Just looking for guidance/advice on a issue that we have been chasing. It was intermittent at first but now seems more frequent but we can't seem to get a handle on the cause.
We are running SD2 with a wideband. Car runs great but a on a few 1/4 mile runs we see the ECM freakout and all the ECM related parameters go to zero enough to shut the car down momentarily during a run.
What is interesting is that the non-ECM connected parameters like the wideband and MAP signals do not go to zero at the same time the other parameters do.
Attached is a snapshot of the WOT portion of the run. The log shows the dip down to zero around the 5700 mark of 3rd gear.
This is a pretty fresh build and we were pretty meticulous with the installation of everything since we have done this a few times already.
One of the early ideas was that this was an alternator issue. We swapped in a known good alternator and the issue was still there. We also removed the voltage booster thing. The logs show a steady voltage throughout the run as well.
The issue hinted as something electrical, so we swapped out ECMs to try and isolate where it is but the same problem occurred. We are about to go into the wiring next but was hoping this has been seen (and solved) previously. The case of the ECM is grounded to the chassis, and the engine ground are clean, we also used the casper's ground kit.
If it hasn't been seen before, then we are open to ideas on what to check or areas that are marginal and could be of concern.
Mike