hey guys well i have an 88 TurboII bone stock only things it has are full exhaust 2.5inch with magnaflow muffer and 2 forza tuning mufflers in the back and a walbro 255lph anyways i purchased 2 gauges today a boost gauge and a/f ratio gauge anyways after installing the gauges i would floor it and the car would feel like its hitting fuel cut? i installed the a/f ratio gauge i spliced into the 02 sensor harness but a friend tells me that now since spliced into the harness that the 02 sensor could not be getting the correct reading and its messing up.... another says that it could be the same thing as friend #1 said or im overboosting and hitting fuelcut he says fuelcut on a TurboII is about 7 pounds???? i always thought it was 10??? if so anyways i floor it hits about 6 pounds of boost and falls on it face all around 5.5 to 6k rpm???? any ideas i was thinking of the correct way to connect the a/f gauge instead of splicing would be to soder it onto the wire instead of just using a but connector? any ideas??

need to have this car running soon as this is my DD

THanks
TwEaK

 

^^^ please need to have this running by thursday...
TwEaK

 

So really it's not not stock at all...

With a full exhaust it probably is. Fuel cut is at 8.6psi. Since you already have an upgraded fuel pump, you should be safe to an a FCD. Just keep boost at or below 10psi.

You should connect at the ECU to eliminate the chance of messing up the shielded wire in the engine bay.

Absolutely. Electrical connections should be soldered wherever possible.

 

talk to you on aim.

i got ideas

<3 you

TwEaK123: you like my online assistant/mechanic what more do i need??? a chick to talk to but at the same time someone when i have a problem to i ask? lol

 

hey nz convertible yes i have an FCD on the way but you think that by splicing into the harness like i did could of cause the car to act the way it did????? im gonna fix it tmw and after i sauder it gonna put shrink wrap over it to protect it ?
Thanks
TwEaK

 

Couldn't you create a shield just by lacing the exposed wire with more wire and some heatshrink? Might be ghetto fabulous but as long as it's not coiled around..wouldn't that help. Getting to the ECU can be a pain sometimes.


That description sounds terrible, basically a shielded wire just has extra insulation and wire running the length of the cable, I was implying that adding insulation and wire and then heatshrinking it on there would help?

 

ok well heres an update this morning i saudered the wire together correctly and covered it in electrical tape nice and tight still have the issue i floored it when i hit about 7 pounds mayb? it starts starving im looking at the a/f gauge while its doing it and the gauge is still reading rich???? any ideas??? only thing left on my mind is fuel cut but how is it that this can happen all of a sudden just because i installed a boost gauge and a/f gauge?
TwEaK

 

bump??? any ideas pls?
TwEaK

 

heh, i hate to say it because it seems to be the band aid answer to every thing

Grounds, lol

hesitations? grounds'll fix it

parasitic battery drain? grounds'll fix it

Blown coolent seal? grounds'll fix it

Flat tire? well.....you see where this useless post is going

sorry i couldnt be more help, i dont know much about turbo cars

maybe you should check wiring and your fuel pump for proper operation, possibly a clogged fuel filter, maybe you knocked a wire or ground loose/off when installing these things, i understand, getting new toys for your car, especially for seven owners, you can get quite excited and disreguard things like, having enough gas in the tank and going for a fun drive through the twisties, and the such

Sometimes things go wrong and seem REALLY related to eachother when they are not, keep all options open

 

i tried my best to check it out??? fuel pump is a brand new walbro 255lph and fuelfilter was replaced less than 100 miles ago??? i watch my boost gauge and a/f when flooring it boost hits about 7psi mayb and a/f is always rich thats why im confused?? i truthfully dont have the cash right now to take it to a mechanic so trying to fix it myself???
TwEaK

 

are you sure your getting a proper reading from your newly installed boost guage? before it was 6lbs and now 7? maybe where you tee'd the vacuum line for the boose guage was a bad spot or is leaking giving you improper readings and your actually creeping up to the fuel cut range? i dunno, just throwing things out there

 

my last suggestion would be, if the car runs fine with low boost, i know its hard not to, but just lay off of it until you get some time to REALLY diagnose it

 

^^ that is possible not 100% shure but i tee'd off the hose that connects the upper intake to the pressure sensor??? thing is i know the gauge is a good gauge (autometer sport comp) but theres times the turbo only wants to hit 5lbs and theres times the car takes off and hits 7lbs??? im lost i truthfully dont think it can be electrical i checked the bearings on the turbo and the turbo is def shot but still should have no reason for the car to fall on its face like it does??? thats really the only thing that bothers me right now =/
TwEaK

 

i got all the time in the world to diagnose it spring break so no work or school so i wake up late and go out i dont mind staying up or waking up early to get **** done but i just need somewhere to start?
TwEaK

 

intercooler leak?

 

also checked i have the stock TMIC for right now i went over everything im as lost as can get???? im gonna stay and go over the car completely tmw and see what i can do?
TwEaK

 

instead of cluttering this thread you got an AIM ID?

 

hmmm....maybe a intake leak that is after the AFM? you check fuses? how dead on is the hesistation? ALWAYS exactly at 5500 rpm? or does it vary?

 

my AIM is CA TwEaK123 im online as we speak
TwEaK

 

The O2 sensor has nothing to do with the way the engine runs unless you're cruising at a constant speed. Even if you screwed up the connection it should have no effect on the way the car runs. Check to see you didn't disconnect anything else while you were working on the gauges.

The word is solder. Soder and sauder are not real words...

 

lol thanks for the correction =) im gonna go over everything little thing if i can today... and ill give you an update i have 2 things to try see if they work ill let you know what happens hopefully it does...
TwEaK

 

Also - that Walbro pump draws more current then the stock pump.
Clip a voltmeter on the pump wires & check the voltage.
I'm guessing you will need to rewire it.

 

hey tweak the problem your haveings sounds like its hitting feul cut for sure mine did the same thing its probally because your exhaust system u put on it that what my problem was.....good luck

 

not to thread jack but man, when are you going to get that beast on a dyno and share some numbers?

 

what kind of voltage numbers should i be getting??? and if i need to rewire it?? is there a how to somewhere????
Thanks
TwEaK