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Ok well AFR isn't going to be super meaningful until the oxygen sensor warms up, which doesn't happen in the first few seconds. So depending on how long it takes to die that might be a red herring.
5.5 sounds like good warm idle. But it doesn't look like you're getting to warmed up, so if that 5.5 is at higher than 800-900 rpm, you have unmetered air getting in. Go back over your work, the intake needs to be airtight.
Also it's totally possible for the car to be a little unstable after disconnecting the battery, while it learns.
I am pretty sure I have found it , air pissing out of evap hose that connects under UIM to next to fuel hose on body drivers side
I had a hard time routing that and bent and cracked it seems
Other have said I can just swap this out for a more flexable easier to route fuel line , but looks pretty small diameter
You could plug the intake port and ignore the evap hose till you get it fixed. It will throw a code at some point but won't cause issues with the way the engine runs.
That is amazing thank you for that !
I was not sure if it could be deleted. Curious where does the other end of the evap on the body ( next to fuel line ) connect to and what is it actually doing
That is amazing thank you for that !
I was not sure if it could be deleted. Curious where does the other end of the evap on the body ( next to fuel line ) connect to and what is it actually doing
Alright so I swapped that evap hose for a fuel line - no change
blocked it off instead - no change
then I found I had only put in 1 of the 2 upside down bolts in that hold the bracket for the evap and fuel line and help hold the 2 pieces of UIM together was sucking in air there for sure fixed that and somehow the car still does not want to idle well wanders less but dies without throttle.
I tried to just go for a drive hoping maybe it just needs to learn its idle now because it does sound a lot better
Now it has 2 strange spots on rpm feels like it gets stuck and then surges at low rpm right around 2k , then sometimes again around 4
It did however then pull straight to 9k for the first time since I ever owned this car so thats something , repeated that several more times worked fine everytime.
I did however get a code on one decel for p0076 intake valve control solenoid circuit low but it cleared itself
I am still stuck with it feeling like its ups against a wall then surges forward happens in all gears at lower rpm or just when starting to build load
Flashing check engine light when it happens badly but no codes
If I am very very light on the throttle and let it build gently surges less only slightly and then can bring revs as high as I want and feels fine and pulls well. no lights or codes in that situation.
My feel is that it is not building fuel pressure at low rpm and high initial load.
Could my oversized injectors have simply masked that problem or is one of my newly sourced primaries not perfect I dont know but I did not have this weird surging issue ever while trying to tame those other injectors only with these ones. I am tempted to throw the oversized primaries back in but that is a bad idea until I know for sure what is causing this.
Could it be my fuel pump I guess I need to test it for pressure. Otherwise I need to send these newly sourced injectors away to be flow tested but NOT modified !
Only decent thing my booked track day yesterday it poured rain all day anyway so I did not care I missed it.
If you're accelerating gently, engine load is lower than faster accel and may be keeping you in closed loop.
Not a bad idea to check fuel pressure. Has the fuel pump been messed with at all? How much fuel is in the tank? If below half, what if you fill it above half, does it behave differently?
I have never touched the pump looks like cover has never been off
I thought about fuel tank as well and filled it yesterday same issue
just so strange that didnt do this with oversized injectors am over thinking of all this at this point but if fuel pump was struggling wouldn't that have been more obvious with oversized injectors it literally never happened once with them just unmanagable amounts of fuel under load.
It sounds a lot like a bad cat, and with a history of overfueling that would check out. I don't remember the entire thread but if you have a cat, check it for clogging.
I am back to a totally stock tune other than bumping up the idle slightly to get it not to die out
Will post both though, thanks very much for continuing to try to help all replies are much appreciated
Looking for anything else I can possibly find and just noticed this crack in intake snorkel tube I could see maybe messing with idle but could this cause my initial up against a wall feeling ?
Bought some refurbished primaries and same problem.
It almost feels like it's not engaging it is so stuck at low rpm but would present far more symptoms if it were and it s a new clutch.
only change with new primaries is the flashing cel comes on less frequently
well not sure I ever would have found this without smoke
the upside down bolts holding the 2 pieces of UIM together someone ( maybe me I honestly don't know) used too long of a bolt here and pierced right into the intake I am guessing there is not supposed to be a hole right through ! ?
So between that hole and the crack in the intake boot I hope is my entire problem but not exactly and easy fix I don't want to fill the hole with something that could come loose a d get sucked down intake so I think my only option is a new one ?
I missed your injector reply earlier but yes I have double triple and so on checked them many times . The primaries both have light green wires , black stripe in the back and red in the front.
Also with previous injectors I had same labels on plugs and did not have this initial chained to a wall feeling just massive over fueling
05-17-2023, 09:31 PM
