Spark plug fouling

[eschaider]

You guys are overreacting.

I do believe he should check all his sensors for a failed unit. However I also suspect, and even more so after Dan's observation about Roush's FAST ECU failures, that Mike is likely dealing with a failed ECU.

Originally Posted by Desert-ValleyMS

... There was a point where Jim at ROUSH wouldn't even question what was wrong and just send me a new ECU and harness. I've had multiple ECU's with failed injector drivers, some when the car gets up to operating temperature it'll just stall and not restart, some just refuse to communicate with a computer... Honestly I don't know why ROUSH went with FAST it's pretty bottom of the barrel EFI. ...

I actually think the Accel DFI units that Roush used before the FAST units were even worse. That said, the FAST units have demonstrated, at least in Dan's experience an abnormally high incidence of failure. Replacing a bad design component with another bad design component is a real world example of doing the same thing over and over expecting a different outcome. There will not be one, at least not consistently — which is what Dan's first hand experience verifies and confirms.

In so far as the cost of the new system, it really comes down to just the box in the case of the MS3Pro. You can use all the existing sensors because the MS3Pro either already supports them or allows you to provide the calibration data for them so they play happily with the ECU. That means the cost of poker at the table is the ECU ($1,499) plus a wiring harness out of a salvage yard. The MS3Pro supports all three common fueling strategies Alpha-N, Speed Density and MAF based, which means it covers what ever the FAST system used — which is most likely Speed Density.

I am not attempting to flatten Mike's wallet. If anything I am attempting to provide him the low cost, highly reliable short way home, purchasing the minimum of new 'stuff'. This is the short way home effort-wise and cost-wise.