Mark,l
I am pulling the injectors and sending them in today. With all you have done to the Bin, my in gear idle is dead set at 108 for the BLM.
Something mechanical has to be wrong, whether its injectors, or something else.
Printable View
Mark,l
I am pulling the injectors and sending them in today. With all you have done to the Bin, my in gear idle is dead set at 108 for the BLM.
Something mechanical has to be wrong, whether its injectors, or something else.
Want to try and take some more fuel out first?
Was hoping that throttle blade issue was the issue, sure would screw things up at idle having one open and one closed.
Only other thing I would have done on your rig if I had my hands on it was oscilloscope the ignition, really shows 8 firings and any inconsistencies.
Really seems strange that log and driving is good, then idle just goes to poop... well better then poop but not right. Did you ever see drippy injectors at idle? You've done checked every mechanical possibility and I have watched your logs frame by frame, I feel defeated here... I don't like that...
i set my timing light reluctor on the coil cover, and I got a coil wire like result. Injectors look fine, no dripping at all...so cancell on pulling them out.
Yeah, we could take more fuel out, that would be great, but I am really starting to wonder about this camshaft.
Kinda wish I didnt give away that small cap dizzy....I still have a TPI/TBI coil on the shelf.
Hot off the press! BLMs didnt go below 111 this time.
I feel like I am in the Twilight Zone with this....Rod Serling`s voice in my head.
That didn't look bad? Try this, only warm up and drive, then pull over and disconnect power from ECM for a minute, reconnect start truck and when goes closed loop start a log.
I took out some fuel there at idle and also removed that 2 degrees from idle... I wonder if we didn't fix the issue somewhere and that 2 degrees is hurting?
I thought about that too, but advanced timing has always madenthings leaner....HMMM, off to log some more, Thanks!
Yes, but if to high can cause a misfire/preignition which really screws up BLMs.
This thing doesn`t seem happy, no matter what.
What did it do? I'm looking at log now, but without being there, it's like tuning by brail...
EDIT: Don't worry about BLM numbers it looks like you cleared memory so they will be off till it learns again. If the VE was absolutely correct they would be spot on like this. right now it is overall rich.
seems like it has richened up at the lower throttle settings, wher it was usually around 123 or so.
Exactly! You lost the ECM BLM learn, your VE fuel is actually getting a tourqe hump. This is all good, unless you didn't disconnect battery? Then bad...
Re did fuel, put the 2 degrees back at idle. Your closer then ever. Do that same thing with data log again. The only way I know to do this perfect first shot is open loop wide band, emulating. If not, it's like this last couple shots...
This is why I don't mail order tune. To much time and hard to get someone on other end capable.
Ca smog Nazi`s should be happy with this!!!
Mark, You are a Wizard!
If I were I'd have got this done sooner.
How is idle?????
How was WOT?
Ahhh... no, we are going to have to have another bin not at 13 to 1 AFR for that... do they scantool these old rigs or just sniff?
I can't see any reason to do anything to that last bin if your happy with idle? The BLM learn will fine tune very quickly being that close.
In drive "stop light" idle is really good, Park idle after the run was a little choppy in the driveway, but the surge is gone.
WOT is good.
They Do use a scan tool,But I think just to check codes.
They usually put it on a dyno after the visual, and do 15 mph, and 25 mph tests.
It barely squeeked by last year with TPI, and an AUJP bin.
Nothing done for the dizzy, or any tuning for the cam.
I can make that pass.
Let me know when and update me how it runs next few days.
Tuning your truck reminds me of the GM Crate 290 HP engine... real PIA... :mad1: