LS motor, OBD0-OBD1, CromeGold, a/f won't remain consistent....WTF!
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From: I'm everywhere Focker
LS motor, OBD0-OBD1, CromeGold, a/f won't remain consistent....WTF!
Breakdown:
EF hatch
B18a
DPFI-MPFI converted
OBD0-OBD1 converted
CromeGold tuned
Got the car wired, loaded the map...no cel, started it up. Had trouble synching the dizzy to the EMS. Checked timing belt timing...dead on. It's one of those ebay reman'd dizzy's, did some research and have found others to have that issue. Ended up notching the ears a tad, got everything synch'd up fine.
Got out on the street, a/f's targeted and just running LS base timing. Car runs fine on first rip, stop, try and rip it again and a/f's are progressively richer...keep driving and they go even richer to the point that the higher load cells cause a misfire.
It seems as if something is causing fuel pressure to rise, or there is some type of effect happening with the injector opening time. I suspected the pulsation dampner and tightened it some. It wouldn't tighten up entirely, but tightening it did seem to show improvement. Still after a long drive though, if you floor it it'll misfire.
I looked at batt voltage and it was consistent throughout both conditions, so I don't think offset is an issue.
Has anyone come across this? What can cause a progressive richening condition? Fuel regulator is stock and I'll likely replace it with another just to be sure there's no issue there. I still suspect the dampner some, so I intend to remove it and work on it out of the car. Anything else I'm not looking at?
EF hatch
B18a
DPFI-MPFI converted
OBD0-OBD1 converted
CromeGold tuned
Got the car wired, loaded the map...no cel, started it up. Had trouble synching the dizzy to the EMS. Checked timing belt timing...dead on. It's one of those ebay reman'd dizzy's, did some research and have found others to have that issue. Ended up notching the ears a tad, got everything synch'd up fine.
Got out on the street, a/f's targeted and just running LS base timing. Car runs fine on first rip, stop, try and rip it again and a/f's are progressively richer...keep driving and they go even richer to the point that the higher load cells cause a misfire.
It seems as if something is causing fuel pressure to rise, or there is some type of effect happening with the injector opening time. I suspected the pulsation dampner and tightened it some. It wouldn't tighten up entirely, but tightening it did seem to show improvement. Still after a long drive though, if you floor it it'll misfire.
I looked at batt voltage and it was consistent throughout both conditions, so I don't think offset is an issue.
Has anyone come across this? What can cause a progressive richening condition? Fuel regulator is stock and I'll likely replace it with another just to be sure there's no issue there. I still suspect the dampner some, so I intend to remove it and work on it out of the car. Anything else I'm not looking at?
Re: LS motor, OBD0-OBD1, CromeGold, a/f won't remain consistent....WTF! (RC000E)
Triple check the impedance of the injectors to ensure you are not running high impedance injectors with a resistor box still installed.
Thread Starter
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From: I'm everywhere Focker
Re: LS motor, OBD0-OBD1, CromeGold, a/f won't remain consistent....WTF! (mtber)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mtber »</TD></TR><TR><TD CLASS="quote">Triple check the impedance of the injectors to ensure you are not running high impedance injectors with a resistor box still installed.
</TD></TR></TABLE>
Yeah, will do on that one
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ChickenH »</TD></TR><TR><TD CLASS="quote">Is your fuel return line restricted? I had a fuel tank with no evap on it that as the fumes in the gas tank pressurized the fuel pressure would rise.</TD></TR></TABLE>
It's funny....I just came out of the bathroom (where all quality thoughts take place...lol) and was thinking about the tank vent to the canister and a pressure rise in the gas tank. I'll be looking at those issues as well.
Will check both today.
</TD></TR></TABLE>
Yeah, will do on that one
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ChickenH »</TD></TR><TR><TD CLASS="quote">Is your fuel return line restricted? I had a fuel tank with no evap on it that as the fumes in the gas tank pressurized the fuel pressure would rise.</TD></TR></TABLE>
It's funny....I just came out of the bathroom (where all quality thoughts take place...lol) and was thinking about the tank vent to the canister and a pressure rise in the gas tank. I'll be looking at those issues as well.
Will check both today.
Thread Starter
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Joined: Jul 2004
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From: I'm everywhere Focker
Re: LS motor, OBD0-OBD1, CromeGold, a/f won't remain consistent....WTF! (RC000E)
::sigh::
Well, it continues. I'm getting backed up with work to get done, and this thing still plays games.
Resolved the purge canister/vent issue and verified 2.3 ohms on all injectors. The ecu still is mismanaging the air/fuel ratio. It fluctuates from 12.5-14.0 at idle...quickly...unlike anything I've ever seen. Gold is exceptionally better at idling cars in my experience and I've had 1000cc injectors idling perfectly, so there's certainly something at work here.
It seems the ecu has lost some level of control over the injectors in that the air/fuel is inconsistent. Under loads it'll jump from 13 down 11 to 10 then misfire, etc. I've used two widebands to verify that isn't the issue...it isn't...it's accurate.
I'm thinking possible ground issues or a distributor issue since its the reference the ecu uses for everything. I'm bolting up a known good unit as I speak.
Well, it continues. I'm getting backed up with work to get done, and this thing still plays games.
Resolved the purge canister/vent issue and verified 2.3 ohms on all injectors. The ecu still is mismanaging the air/fuel ratio. It fluctuates from 12.5-14.0 at idle...quickly...unlike anything I've ever seen. Gold is exceptionally better at idling cars in my experience and I've had 1000cc injectors idling perfectly, so there's certainly something at work here.
It seems the ecu has lost some level of control over the injectors in that the air/fuel is inconsistent. Under loads it'll jump from 13 down 11 to 10 then misfire, etc. I've used two widebands to verify that isn't the issue...it isn't...it's accurate.
I'm thinking possible ground issues or a distributor issue since its the reference the ecu uses for everything. I'm bolting up a known good unit as I speak.
Thread Starter
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Joined: Jul 2004
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From: I'm everywhere Focker
Re: LS motor, OBD0-OBD1, CromeGold, a/f won't remain consistent....WTF! (RC000E)
Alright, did some steady state logging and it appears the injectors shutting off according to the crome log. Something is definitely happening in the wiring so I'm gonna have my brother pull the harness.
I gave him wiring diagrams to follow in the conversion process, but it appears something is happening here in the management of the fuel system. If the injectors shut off entirely according to the management, so I'm assuming it'll have something to do with the power to the resistor or some type of short in the area. I listened closely near the resistor and I hear a ticking happening...somewhat like an arcing sound.
Seems like the issue might end up being wiring related. So, that's the status.
I gave him wiring diagrams to follow in the conversion process, but it appears something is happening here in the management of the fuel system. If the injectors shut off entirely according to the management, so I'm assuming it'll have something to do with the power to the resistor or some type of short in the area. I listened closely near the resistor and I hear a ticking happening...somewhat like an arcing sound.
Seems like the issue might end up being wiring related. So, that's the status.
Thread Starter
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From: I'm everywhere Focker
Re: LS motor, OBD0-OBD1, CromeGold, a/f won't remain consistent....WTF! (RC000E)
Dizzy didn't change anything
Pulled the wiring harness and rechecked/retaped
Still getting large a/f fluctuations. I'm gonna change injectors due to a perceivable tick with the engine running that certainly is abnormal.
I guess it's these that keep me thinkin. I go through alot of cars, problems, issues, builds....sometimes things get too easy, then out of nowhere a simple setup creeps up out of nowhere and rocks the boat....ehhh....all in fun I suppose.
Pulled the wiring harness and rechecked/retaped
Still getting large a/f fluctuations. I'm gonna change injectors due to a perceivable tick with the engine running that certainly is abnormal.
I guess it's these that keep me thinkin. I go through alot of cars, problems, issues, builds....sometimes things get too easy, then out of nowhere a simple setup creeps up out of nowhere and rocks the boat....ehhh....all in fun I suppose.
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