Power cutting out completely
 

88 Turbo II, No cats/smog equipment, New fuel injectors, Walbro 255, TO4 Turbo, ported waste gate... I finally got the car drivable, everything was working fine, I boosted for like 5 seconds and then my power cut out. I can revv it up if I go half or quarter throttle, but if I go full throttle it just cuts out and drops back down to like 1k rpms... It feels like fuel cut but it won’t even boost, at idle it sits at -19 psi, if I give it some gas as soon as it hits 1 psi it cuts out. I ran the codes and didn't get anything. Any Ideas ??

Sounds like a vaccum leak. You may have popped a vaccum line off or your rubber hoses on either the turbo side or intake side may be loose...

One time, I had just gotten my car back together and forgot to tighten down my intercooler and TB elbow hose. I took it out for a spin, boosted once and then hit a flat spot...I checked and sho enuff...major intake leak due to my own haste...

Full T04???
Stock ECU???


-Ted

id sure hope not

oh shit...I didn't even notice the T04 reference!

Hmm....this just got interesting...

well some of us hope that are engines dont become toasted....after it shuts off at random :(

well the compressor side is Turbonetics, It's simaler in size to a TO4. Stock exhaust side. stock ECU, Im planning on keeping it turned down to like 8 psi.

so....it's a hybrid...

Are you using the TMIC?
I'd check your IC couplers

I've got an APEXI SAFC I want to tune it to run at like 12 psi.

It's a fMIC I checked all the couplers

I dont hear any boost coming out anywhere, it's like the waste gates not working or something

It doesn’t seem to have any vacuum leaks, is there a possibility The ECU could be cutting fuel for some reason?

Anybody?

FCD?
Upgrade fuel pump???


-Ted

well I upgraded the fuel pump to a walbro 255, I just bought a fcd but I didn't think that would make any difference unless I was boosting

One or both secodary fuel injectors are not working...
Else, something is wrong with the TPS.


-Ted

well the injectors are brand new so I hope they aren’t giving me problems. And I kind of had a feeling it was the TPS, only thing is I tested it with a ohm meter it checks out.

I didn't say there was something wrong with the fuel injectors, per se...
The plugs or electrical connections could be loose and backed off?


-Ted

They seem to be plugged in, how do I check if there opening? Also is there a possibility that the fuel filter could be plugged causing it to starve once the secondaries open?
Cause now it feels like its surging, if I go wide open throttle it will rev up until it hits like 5k then it feels like it’s chocking drops down 1000 rpms or so and will just keep doing that.

ok update, I Just tested my fuel pressure. I've got 30 psi at idle, 40 once I start reving it. As the rpms get higher it starts to drop, all the way down to 15 psi and then it cuts out. I'm about to change my Fuel filter to see if that helps.

What size injectors did you get? No fuel control and too big of an injector and you could be bogging down after 3,800 rpm.

B

it's stock injectors

well I changed fuel filter, checked fuel pressure it didn't change. car seemed to be running better though. I took it for a drive, It ran ok for a minute then it started bucking like hell. It started loosing all it's power until It started stalling, It will start up and idle (barely) and then If I even touch the gas it just dies.

I guess whatever was going out just took a shit.

Crank angle sensor? MAS airflow sensor?

anybody?