SavMan

It does correct itself after a few seconds and while the AFR is showing lean everything else says it is actually running rich and the wideband is picking up the oxygen in the unburnt fuel.

The bad news for those that have this same issue is that if my car is anything to go by a software revision update does not fix it.

E55Greasemonkey

Sorry to hear the s/w update did not fix it. There goes that theory. I still have zero problems to date. Maybe we can start a list of our engine ecu part #s and see if there is a pattern there.

bstudey01

How much boost are you seeing max at WOT in 3rd gear? I have the same issue and my boost number seems really low from what others are seeing with similar pulleys. I have 178 lower and 84 upper max I have seen logging through obdii with dashdaq is 27psi minus 14.5 for atmospheric pressure makes 12.5psi. Maybe a boost leak??? I know you have gone over the car again and again, but what boost are you seeing??

SavMan

Not sure if this will format properly but here'e data from a 3rd gear pull

IAT 136.3 (degF) RPM 6350 (RPM) SPARKADV -16 (degBTDC) MAP (PSI) 30.29

bstudey01

hmmm, that's 3psi higher than me, I'm at 600ft or so above sea level. Just ordered a zeitronix map sensor to see if my reading is inaccurate or not. If not, I must have a boost leak. Looks like you have similar exhaust mods too, also ported heads which I would think would lower your boost over mine. Something does not seem right to me with my boost readings

Joncl

Do a 3rd gear run with only the map on the dashdaq, the obd is slow to refresh

lm7

This is one frustrating issue makes me want to take the car back to stock, how can it stump all the tuners as well!

black06c230

I run a MB 82 and have no issues at all. So odd.

dllhg

Would be good idea to list what tunes people are running who have this issue.

I dont know of any OE tuned cars with it. Not saying there aren't I just dont know of any, myself included.

Might want to try another TB or another tune. I knows its not real simple or cheap......

berti_00

yah me and my buddy did our 82mm together and zero issues... car runs as sooth as they get

lm7

I think this is related to the year of our cars this seems to happen to the 03-04 cars but 05 and up unaffected?...

dllhg

The other guy I was talking about has an 03.

lm7

Well there goes that... Lol when this is solved I'm sure it will be an easy fix in the mean time lets keep throwing $ at it . For documentation sake my mods with this problem:

2003 e55 118k
77mm FSP
belt wrap kit
90mm BBK TB
MBH longtubes
3k stall TC
killer chiller with trunk tank
Eurocharged ECU Tune

dllhg

You did the KC with trunk tank ? How are you liking it so far ?

lm7

Loving it. I'm at 5-10* above ambient on normal driving I climb to max 20* above ambient on WOT pull and back to 10* above in moments. Been meaning to meet up with you. PM see if we can make some fun passes next weekend in the south county area.

Denroll

I've got some screenshots of my logs during the hiccup. I'll post them later when I am not on phone.

Crissus

How can we anyone find the deeper details of that issue? Is it for sure an ECU problem?
Jesus i already bought myself an expensive 82mm TB new MB Part but since reading this im afraid to actually add it to the motor...

dllhg

Cool, best mod for these cars IMO. Are you still running the heat exchanger ? 20 above ambient on WOT ? Are those short pulls ? Mine still gets very high on any long WOT pulls. I have gone from 55 IAT to 170 with a 0-130 run. You arent making the heat mine is making though which would help. Just looked it up and your pulley should be making the same boost as a 180 pulley. Not much less heat than my 185 lower . Love to know how yours reacts to a long WOT pull. Benn wondering how much a trunk tank would help over my 2.5 gal tank. Surprised your IATs arent getting below ambient unless you are running your heat exchanger still.

Shifter

Wait I'm pretty sure you were having an issue since the tb install, remember reading a thread about it ?????

black06c230

Think he was having a problem with the tq limiter after the install. Could be wrong though.

Denroll

Here's a screenshot of my log while cruising (note: ignore the upper AFR, it was a broken sensor). The first vertical line is where it hits hiccup mode and the second one with the numbers is where I am getting fuel cut after hitting some boost. While in hiccup mode with fixed pulley, hitting 7-8psi instantly maxes AFR and the car just stumbles while MAP also spikes. Looking at the TPS line, you would think I am jamming on the gas, but I am not. I'm only giving it like 10-15% and it spikes to 100%.




Where is the sensor that translates gas pedal movement in to TPS?

Here's another. So weird.

E55Greasemonkey

The gas pedal itself has a sensor that sends the [requested by driver] throttle position to the ECU. I wonder what "tps percent" is actually looking at...feedback from the throttle body I would assume.

Denroll

Not too crazy about drive by wire. I wish having a cable connecting my right foot to a throttle mechanically.

E55Greasemonkey

Your MAP graph line, and AFR, matches the TPS, it sure looks like your throttle is opening and we can assume no fuel is being added, hence the lean condition, and of course the car not accelerating on it's own.

Denroll

Thing about that TPS going full WOT... I am not going WOT. Only giving it less than 1/4 throttle.