NZ_87_TURBO

check the earth on you fuel pump. that was causing me problems.
Now someone answer my question...... please

Kenteth

Update:
I jumpered the fuel check connector. I suppose its no suprise to you that it idled around 1500 just fine with the fuel connector jumpered. I guess that explained most of that.

The fuel pressure regulator is not malfuntioning, I heard the fuel return to the tank.

I had a spare AFM to use, same thing, engine runs 5 seconds and dies.

I honestly don't know how there can be any intake leaks anymore... I've checked everything over and over...

Any suggestions on checking the AFM wiring? I find it hard to beleive that 2 AFMs could be bad? I also find it hard to believe that I otherwise would still be facing vac leaks...

Thanks for the Help.

drago86

If the engine stays running with the AFM depressed its not fuel, its the afm.

There is a massive leak somewhere upstream of the afm most likely.

What exactly did you remove when you removed the emissions/ rats nest? Did you mess with the accelerated warmup silonoid/plumbing? That is the most likely place for a leak large enough to cause this.


Is the little black plastic elbow ,under the main black plastic pipe that goes to the AFM, that goes to the accelerated warm up silonoid connected? is all the plumbing to the accelerated warm up silonoid connected? Check a vacume diagram and make sure every hose in that system is connected.

Ive forgot to just reattach the plumbing to the little elbow below the intake before and gotten exactly this result. That system and the brake booster line are about the only vac line things big enough to cause the fuel pump to cut out.

Kenteth

Sigh...

Yes... the BAC is attached. Yes it it plugged in, yes it gets its feed from the intake upstream of the AFM. Let me list off the places that I have checked, so you can rule them out:
ITs not the brake booster, and its not the injectors. ITs not the manifold surfaces, and its not the vacuum nipples. Its not the the injector atomizers and its not the DC surface. Its not the nipples on the TB and its not on the elbow. Its not on the large nipples off the Intake tube.

FC3MAN

is the fuel filter properly installed?I know it sounds stupid,but it should have a check ball to prevent fuel from from flowing the wrong way,check the hold pressure with eng off.

Kenteth

Its bypassed at the moment.

Also, confirmed that the fuel pump circuit opens when it starts to die, so the problem lies in the AFM or related system.

The only thing I coudl find that opens that closes that circuit is the AFM and the check-connector. When the check connector is jumpered, the fuel pump stays on and the engine stays running. When its not, the engine runs only until a specific event about 5 seconds into the engine running).

Can anyone confirm if the startup map bypasses the AFM? Or possibly the BAC starts the motor with high rpm and as it drops down the AFM closes more and more. I still don't know how a Vac leak could be anywhere to cause this...

Kenteth

Driving with fuel connect jumpered. Looks like there is a bad ground going to the AFM.

Kent

RotaryEvolution

iTrader: (30)

i still say you have a vacuum leak somewhere

Kenteth

Mmm... I'm going to spend a little time this weekend. Last place I can think of is the rubber intake ducting. Thinking it might have cracks...