How is this helpful?Originally Posted by dave w
How is this helpful?
My post was centered on the topic or comments about changing computers, MegaSquirt computer vs. Factory computer. Generally speaking, the Factory LS1b or '0411 computer is one of the best supported computers, including support from EFI Live and HP Tuners. It's very possible there are several tuners in your area that have extensive experience with the '0411. Maybe there are tuners in your area with extensive experience tuning with Megasquirt?
I admit, my post did not mention any possible solutions that would be helpful to fix your engine.
dave w
on any sane fuel system, lack of flow would cause a pressure drop as fuel flow requirements exceed available flow, so no. you'd see it on a pressure gauge, although revving in your driveway is quite different from driving.Is it possible to have good fuel pressure and have lack of flow getting to the injectors cause by a clogged fuel filter?
you could also have intermittent fuel pressure loss, might not be the pump, could be loose clamp in tank, cracked pickup hose, something like that.
i agree that switching ECMs right now would be a bad idea, in fact a different ECM might 'tune around' the problem more easily, but you'd still be burying whatever is wrong.
if 'resetting' or reflashing or whatever temporarily cures the problem, i'd say you have some kind of problem with closed loop. why don't you burn an open loop bin and see if it behaves itself?
it's also possible your ECM is flaky, but you'd probably see other evidence of that
i'd be interested to see some logs of when the weird behavior happens
I thought the same thing about the fuel pressure. I used to play with closed loop but closed loop would make my car run lean and then I learned I needed a heated o2 sensor but that did not fix it in closed loop still ran lean so I just always leave closed loop turned off by setting the enable temp closed loop as high as it goes. But now it's running lean in open loop too!
I have a moates data logger but not sure how to record with it yet. I've been using it to see the data live on the tunerpro RT dash.
The MS2 should be a pretty straight forward install on my vette, it doesn't need any aftermarket cam sensor setup and I've built a MS1 for my turbo Miata before. The tuning part on that ecu was a lot easier than what I've dealt with trying to tune my stock vette ecu.
From what I can tell my tunes are changing based on weather conditions of the day. It's finally getting cooler in AZ and it's messing up my tune. probably has something to do with the fact that tunerpro won't accept my bosch injector offsets so I'm using the stock offsets and now it doesn't know how to make adjustments because it's using bad information.
Today I warmed up the car and it was lean cold, rich while warming up and just a little lean at operating temp. it was way lean cruising but if I stepped on the gas it was good 12.5-13.0 afr. But then it would start the lean out again at higher rpms 4500+ about 14.5 afr and I'd let off the gas.
how do you mean? lets see your bin, xdf, and target offset data
I mean it's hot as hell in Arizona and that's the last time I tuned the car and it's stayed hot until recently and now my tune is way off. My tune was never really too good to begin with.
I did just have success richening it up. I got a wide open throttle run in an it was pig rich all the way! I did this by setting the 'Open Loop % Change AFR vs Temp' to all zeroes, and 'Open Loop % Change vs MAP' to all zeroes. The one that made the big difference was 'MAT Compensation Counts vs MAT' set to all zeroes. after the very rich WOT run I adjusted the affected temperature ranges to 40 down from the factory 128. it got my idle around 13.5 AFR and full throttle the same.
Why so many crazy variables on this car!? I'm tempted to set everything to zero and just run off of the fuel map alone and retune the map for it The only noticeably affective variable was the 'MAT compensation Counts vs MAT'
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