Mi16 Dying Under Load

[arwel 43 2 Cars]

Just about finished with the rebuild of the rally car and finally got a chance to drive it earlier. Didn't get very far as it just dies under throttle.

I swapped the air flow meter as I had a similar problem when I first put the mi16 in but that made no difference.

Would a dodgy TPS cause it to just die under load?

Everything is the same in this car as the last, the only thing we chnanged is the fuel pump. Never had a problem on the standard unit but we now have a walbro updated pump in there. Could This be not feeding enough fuel for some reason when it's being asked for?

[jackherer 543]

It wont be the TPS.

 

Does it rev up cleanly in neutral then?

 

It could be a split in the induction hose so air is getting in without going through the AFM. Normally it's one of the two take offs for the ICV and breather hose.

[welshpug 1,657]

check the pump is sat low enough in the cradle, or chuck more fuel in.

[arwel 43 2 Cars]

Cheers guys. Will check both tomorrow, had a f*** full of it today haha

[arwel 43 2 Cars]

Went back out to the garage as it was doing my head in. No splits in the pipe work. I'm questioning myself if their all the right way round so that's tomorrow's job. Will also check the fuel pump location to make sure that's all good.

[arwel 43 2 Cars]

Found a bit tear around one of the breather pipes on the afm pipe work. Changed that and made no difference. Fuel pump goes quieter when the power steering pump is switched on. Thought it may not be getting enough power then due to the battery not being upto the job so put a new battery on it and still no difference. Turn the powersterring pump off and flick the fuel pump on and off and you get no problems for 10-15 seconds and then dies again. Worth sticking a standard pump back in as that's the only change we be made?

[arwel 43 2 Cars]

Little update on this one. We appear to have tracked the problem down to either the fuel pump or the regulator on the rail. Under load its not having enough fuel. Its either a problem with the pump not providing enough pressure for some reason or too much fuel being left out on the return pipe. We clamped the return pipe to reduced the flow going back and increase pressure in the rail and it seemed to be working fine again so some more tests required.

[Richie-Van-GTi 71 2 Cars]

Clamping return shows the fuel pump is up to the job by the aounds of it so I would start by swapping the fuel rail for one with a known good reg. That or put a new inline reg after the rail and see what happens.

[arwel 43 2 Cars]

Turned out to be a loose jubilee clip on a pipe on the pump. It allowed enough fuel through on start up but once under load it didn't have enough pressure due to fuel seeping through where the jubilee was loose and back into the tank. Tightened it all up and no problem.