Trying my patients (and I got loads)

[LE16]

so far....

Lower comp (Wossner) pistons.
ARP's
H-Beam Rods
Bored/honed
Head reworked
New gaskets
New cam kit
New plugs
New leads
New arm
Turbo reconditioned..
Compression ok
Pipework all ok (seemingly)
New Intercooler and 2.5 inch piping.

Standard ECU

so all should be sweet?

Noisey lifters (replaced but now rough idle)
Power cut on fall back or boost (no fault codes previously but may be now) defo no EML on.

but.....Tappy noise gone....and performance seems ok till it freaks out and cuts!

I need some inspiration here! I know it was allot to take on in one go but there arent many ways to do the same thing!

grrr

[LE16]

I think....its Belt timing, will get back o it today

[MadOnVaux!]

Loads of 'Patients'? are you a doctor then??? lol

[Peachperformance]

What do you mean by power cut on fall back? Is it poppping on overun during engine braking? If so it could be overfueling. Incorrect and irregular fuel pressure can also cause your problem during acceleration.

I would check your fuel pressure regulator, try plumbing a fuel gauige into the schrader valve connection on the fuel rail so you can monitor the pressure during a run and look to see if it starts to weaken when holding constant acceleration. Use something like 3rd or 4th gear up a hill and full throttle if you can.

Also if the cut in power when accelerating is almost a cpmplete cut in power, as if you've shut off the throttle and tapped the brake pedal it could be the ECU preventing overboost. Basically the boost pressure is to high for the stock ECU.

[LE16]

What do you mean by power cut on fall back? Is it poppping on overun during engine braking? If so it could be overfueling. Incorrect and irregular fuel pressure can also cause your problem during acceleration.

I would check your fuel pressure regulator, try plumbing a fuel gauige into the schrader valve connection on the fuel rail so you can monitor the pressure during a run and look to see if it starts to weaken when holding constant acceleration. Use something like 3rd or 4th gear up a hill and full throttle if you can.

Also if the cut in power when accelerating is almost a cpmplete cut in power, as if you've shut off the throttle and tapped the brake pedal it could be the ECU preventing overboost. Basically the boost pressure is to high for the stock ECU.

Its a complete cut then lift off the throttle and its ok. It has all the trappings of boost cut by the ECU but it doesn't just happen on full 0.8 boost but admittedly it happens when flooring it. I haven't increased the boost (It's standard)

[LE16]

Loads of 'Patients'? are you a doctor then??? lol

Ask Safari....it runs the spell checker.

[LE16]

FPR is standard but I am now reading this....

The exact same symptoms.

http://www.migweb.co.uk/forums/engines- ... -nova.html

[Peachperformance]

Its a complete cut then lift off the throttle and its ok. It has all the trappings of boost cut by the ECU but it doesn't just happen on full 0.8 boost but admittedly it happens when flooring it. I haven't increased the boost (It's standard)

Deffinately sounds like a fueling issue. The standard FPR's are useless for modified motors as they use a rubber diaphram inside that can split and this leads to the fuel pressure weakening off during ong periods of acceleration.

FYI FSE FPR's / "power boost valves" are just as bad as they just use a bigger rubber diaphram. I had one split and fry my ECU as it filled up the vacum lines (including the one for the boost pressure sensor on the ECU) with fuel.

I'd recomend you ditch your standard FPR for am uprated piston type one or at the minum fit a brand new factory part.

[LE16]

hahaha!

"it doesn't look as clean as this..."

"http://www.youtube.com/watch?v=lQFIzPZIFjU&NR=1"

That wasn't my video....I asked if that was normal boost behaviour.

Mine doesn't do that at all.

Now that's cleared up....I am still miffed by this. Have a look at the Mig Thread, its the same thing but since I did the lifters and the cambelt tension it has reduced by 70% so it's only happening occasionally.

The poor guy in MIG did so much to resolve this...he has done me a big favour. I suspect that my pipe is collapsing but if not I am going to close loop the AML and see what happens. For the sake if it I will get a new fuel injection relay and if none of the above works then look at coil and pump voltages.

Sean.

[LE16]

Its a complete cut then lift off the throttle and its ok. It has all the trappings of boost cut by the ECU but it doesn't just happen on full 0.8 boost but admittedly it happens when flooring it. I haven't increased the boost (It's standard)

Deffinately sounds like a fueling issue. The standard FPR's are useless for modified motors as they use a rubber diaphram inside that can split and this leads to the fuel pressure weakening off during ong periods of acceleration.

FYI FSE FPR's / "power boost valves" are just as bad as they just use a bigger rubber diaphram. I had one split and fry my ECU as it filled up the vacum lines (including the one for the boost pressure sensor on the ECU) with fuel.

I'd recomend you ditch your standard FPR for am uprated piston type one or at the minum fit a brand new factory part.

I am using the standard FPR. I know about FSE boost valves. I had a diaphragm go in mine and it caused major fuelling problems. The thing is its no where near as bad since I did the lifters and in doing that I had the airbox out in one piece. I may have reduced this by putting it back as one piece and so the intake pipe is not collapsing like it was (of course that is if this is the cause)

I'll bare this in mind...I wanted to get a 3.5/4 bar VX regulator anyway. Do you know of the part number for these or are they after market only?

[LE16]

Hi,

Yes plug gap has been checked and I replaced the leads. Its seems to be happening much less since I had the airbox out and put back. Still need to tick a list of things but looking at the mig investigation I can rule out a thing or two. I want to upgrade the FPR anyway to a high pressure one. Anyone got one (not FSE junk though) had that destroy an engine before!!