Hey guys,
Been working on getting Grandpa (my bronzeit 88is) up and running with the new RHD ITB and Megasquirt setup. Will be awesome once its done and its been way too long being out of service (been over a year)!! Funny how a simple front end refresh turns into a (well might as well change out the oil pan gasket which then turns into, lets put on some ITB's and Alpina headers and make some more noise and a little more power.
Flashforward to last week....
Well, I got whodwho out of retirement to help get this last part finished up and we are struggling a bit at this moment. I have the ITB's all syncronized and larger 19lb injectors flow matched from SSSQUID installed on the fuel rail. Wideband O2 sensor is downrange from the header collection (custom fabb'd by the Muffler Man in Placentia, amazing work btw), GM IAT inside plenum, and variable TPS installed on ITB assembly. Besides those nothing else in the car has changed (besides MS ECU obviosly).
I had initially had one of the evap system harness connections connected to the TPS, which after some trouble we figured out was the problem since we were getting 12 volt signal to the tps. That fried the TPS unfortunately. And the ECU…We swapped out with another TPS and Keith replaced some transistors and got us back up and well, working kinda. We can get the car to start up and run, albeit not perfect m20 smoothness. Wideband shows normal range when cold, but once is warmed up it steadily climbs from 14 and quickly leans out past the gauge max after 10 seconds or so. If we shut the car down and let it sit for a few and restart, it will do the same, but never stays in proper range. We try adding fuel to enrichen the mix, to the point where the car would stall, but never would come back down on the controller, always showed lean. Seems like no matter what we did, full rich, full lean, perfect stoich (momentarily), and it would still run rough. Brought over another MS setup and tried running that one and still the same issue, so we are pretty sure it is not the ECU at this point (but still a possibility obviously).
To do list today was not touched but here was the game plan.
1) Pull flow matched 19lb injectors and prime fuel pump and visualize for leaky injectors
2) Replace with stock injectors
3) Place pressure gauge on rail and observe pressure at idle and throttle
4) Replace wideband controller
5) Replace wideband o2 sensor
Besides these ideas, what else should we be considering at this point?
Thanks all for reading and any guidance given.
Cheers,
G
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