Is it possible to boost creep and fuel cut at same time?

[caseclipsegst]

I know this topic is played out I've searched but please help lead me in the right direction .. Mods.. Rebuilt engine stock internals(2000miles on the clock)16g,Megan o2 housing,2.5 to 3" dp, 3" no name exhaust,gm maft with translator, Walbro 255.. No tuning at this time

I bought the car with a spun bearing so rebuilt the whole engine, ended up putting a 16g and all that and ever since I got her running I've had this problem of when I give it wot the guage will creep up to 20psi and do like a fuel cut type of jerk/bog and won't go no where till I let off the gas .. I have the mbc set to the lowest possible setting.. Mind you that this happens only when wot, now as long as I don't put the pedal down it'll run ok.. I did a boost leak test and found the bov to leak like crazy could this be the biggest cause? Or is it the dreadful 16g/ big exhaust(no cat) deal..

I've had this problem ever since the rebuild and it's time to get rid of it.. It's embarrassing when someone revs up to you and you have to take it ### they will smoke you in their minivan ha

 

[NHerron]

I would just go with the thunderbolts listed on ebay. Search "3 high flow converter" on ebay and you'll see them

 

[hazmat6135]

You said you have a MBC set as low as it will go? The first thing I would do is remove it and put the line straight to the WGA like a factory setup. Maybe your MBC is acting up. Secondly you said you motor has 2k miles on it? If you don't want to be rebuilding it again then keep your foot off the geas until your have a wideband and some way to tune it! 95 % of people asking about problems have a bunch of upgrades like turbo, exhaust, fmic, fuel pump, ect and no way to monitor or tune! This should be your fist mod with any car! Esp a high performance one. SMH

 

[caseclipsegst]

Well that's exactly why im here asking these questions.. To learn!! SMH up and down.. I will look into those converters..

I actually have a spare mbc and no difference with either..the car is parked right now waiting till some type of wideband an tuning can be purchased.. Your right though I would hate to pull and rebuild again..

 

[NHerron]

Good job diagnosing you have no idea how much that helps us to help you. Any other qs just drop them here or PM me.

 

[caseclipsegst]

When I bought my maft and translator, I got it off some guy from Craigslist thinking it was used for $150 for both.. Well when we meet up the sensor and translator was still new in the box.. Not bad huh!!

But I also got these two wire harness with it, can anyone tell me what they might be for?

 

[hazmat6135]

looks like the bottom one hooks into the ecu. it has the same plug as the OBD1 conector on the one side. I'm assuming it is for logging. Idk about the top one :/

 

[NHerron]

Tops one possibly turbo timer? One end plugs into ECU it looks like

 

[caseclipsegst]

I doubled checked on those plugs and niether would plug into the ecu?

 

[NHerron]

Post more detailed pics of the wires (with the connector halfway showing in the pic)

 

[xNocturnalx]

Ive been having this same problem with my talon ever since i put a 16g on it saving up right now for a ECM Link..

so would this o2 housing DSM EVO III o2 Housing#-#1G DSM o2 Housings#-#1G 90-94#-#Exhaust#-#DSM Performance Parts | DSMparts.com and,proper tuning fix the boost creep problem? cause i also have a 95 hitting 20 psi when i put the pedal to the floor causing fuel cut...