its cold here now, and every since, if i boost hard before 5 mins from a cold start, i get fuel cut. anyone else have this? the fuel cut doesn't happen if i press the throttle at wot, but sometimes when i go partial, there's a stutter.

thought i have the missing link, do we have other options to dealing with preventing fuel cut besides the fcd hrc, and ml?



-------jezreel
hrc stage 1, sfmu, ml, prokits, egt, boost gauge, apexi tt, costum dp, dynotune fp gauge. gst muff, turbo spoiler

The Missing link should be the end all be all to your fuel cut issues.

Try cleaning it out.

just a small shudder? i always thought that fuel cut was a more violent experience. maybe i'm wrong, i dunno, i'm not turbo yet, but i always thought that if you hit fuel cut that you would definately know it.

ya, fuel cut from a missing link isnt that uncommon. with our egr system, it will get clogged with all that exhaust shit. just do the egr blockoff mod thingy. i cleaned the intake mani, and blocked off the egr, and cleaned the missing link, and i have yet to get another problem with it. just take off the upper intake mani and clean it out. all good.

Originally posted by CopperEclipse96
just a small shudder? i always thought that fuel cut was a more violent experience. maybe i'm wrong, i dunno, i'm not turbo yet, but i always thought that if you hit fuel cut that you would definately know it.

heh, fuel cut feels like your engine fuckin blew up or something and your car just wants to stop so it can die peacefully. this was in a friend's car, but my closest experience has been hitting the rev limiter which is fuckin hardcore too (i'm under the impression thats ignition cut, but it might be fuel cut).

replace the filter of your missing link and make sure all passages are clean. check your plugs and wires.

it's definitely not the end all be all of fcds.. i've never had the ml keep from fuel cut at part throttle. apparantly it just lets too much boost through in trasition for some "sensitive" ecu's. i'm not only one like this. but yeah try cleaning it.. may help

yeah cleaned it out last week, squeeky clean i might add.

oh well... im getting used to the shiny check engine light.

-------jezreel
hrc stage 1, sfmu, ml, prokits, egt, boost gauge, apexi tt, costum dp, dynotune fp gauge. gst muff, turbo spoiler

Originally posted by jsupetran
oh well... im getting used to the shiny check engine light.

lol, yeah you know i've had that problem recently too

i cleaned off my missing link but it looked fine beforehand. who knows, guess it's just another price to pay for boost eh?

Talk to ner947 about this. He was working on a circuitry system which would take care of the partial throttle fuel cut experienced by some ML users. I'm not sure if he got it fixed or not, but give him a shout. (he's an electrical engineer so he knows his shit)

Are you sure it is fuel cut? it could be that your fuel rise rate is too steep and if you get into boost it choaks. It could also be the other way around.. maybe your FMU is not getting a strong enough "boost signal" when you get into it slowly so it lags a bit in supplying you with fuel. Is your vacuum line going directly from the FMU to the intake manifold?
Look at those, the problem could be simpler than you think.

Originally posted by a_miller_76
Talk to ner947 about this. He was working on a circuitry system which would take care of the partial throttle fuel cut experienced by some ML users. I'm not sure if he got it fixed or not, but give him a shout. (he's an electrical engineer so he knows his shit)

yeah.. nate's one of the others w/ the same issue. seems to also depend on what altitude you're at. btw what year are u? so far all of the people w/ this sensitive ecu thing have been 97's(that i know of)

Also, if you're boosting before the engine warms up fully, it's not using the learned fuel maps yet, it's in warm-up mode which deliberately runs rich.

After you clean your ML, make sure you lubricate it with a really lightweight oil. WD40 is not oil. I use Marvel or 3-in-1.

At part throttle, the ML does stick a tiny bit. This feels like a little blip in the throttle, like you let the clutch out too quick or something.

Fuel cut feels like the engine just decided to do a faceplant, and you wonder if the airbags are going to go off, just as your nose gets about 3" from the steering wheel :)

bottom line is, if you're getting a cel from "MAP circuit too high" then the hesitation is fuel cut. when the map sees pos. pressure it cuts fuel.

i got a cel code, p108 (map related). i'll check of what you guys said though. i have a 98 gs.

i drove my car to school and made sure the needle was all the way in the center (temp gauge). so i boosted a couple of time and no fuel cut so:wary
and :-)


-------jezreel
hrc stage 1, sfmu, ml, prokits, egt, boost gauge, apexi tt, costum dp, dynotune fp gauge. gst muff, turbo spoiler

i wouldnt boost at all when the engine is cold period. when you are warming up, its gonna run rich. id say thats all your problem is. do you have bigger injectors?

1999 Black C5
1997 Silver RS
Wiseco 8.8:1 Pistons(back to low compression!)
Eagle Rods
T3/T4 Turbo
Custom FMIC
Greddy Exhaust
390's
Most current 1/8th mile time: 8.3@90mph 2.015 60'(Nitto Drag radials, i suck)

yeah i guess your right especially since its winter and all; that's when i started having issues.

so when is the car fully warmed up? is it when the needle is in the middle or should i go to a prescribed time, say 5mins?

-------jezreel
hrc stage 1, sfmu, ml, prokits, egt, boost gauge, apexi tt, costum dp, dynotune fp gauge. gst muff, turbo spoiler

Needle in the center IMO. You can usually feel the car smooth out when it goes into 'smart' stoich mode, the idle will drop a little too.

I agree with 97eclipseRS ^^^ tho. You shouldn't have any positive map pressure ever with a ML.

i usually wait till my oil press goes down to normal levels.. thsn i know the oil's warm and thus the engine