Dragsteer

Since I have this car one problem is never solved. So all advices is welcome, because this is my only problem but it is very annoying.

When I flor it, boost start rising, car accelerate, but then suddenly car start to breaking, I mean engine doesnt accelerate good anymore, and I hear that engine change noise a little, just like you go uphill and flor it but revs are too low.

This problem I noticed in second and 3th gear.

I set ignition timing , fueling (about 12.3 : 1), new sparks, new spark cables.

what you advice me to see? maybe cam? what are simptoms of worn cam?

Fiecos Dan

Sounds like cam's your issue.


remove it and measure the lobe's with a ditital vernier.

haz87

What ignition timing have you set?

Dragsteer

12 degrees. But I try retard it and advance it and same problem.

fiecoss dan: thanks, I hope so that cam is problem because everything else is checked.

Rick

collapsing boost hose.

Drag_steer

how u mean collapsing? hose which goes from IC to inlet plenum ( to aluminium pipe)? But boost dont fall when I drive, only car start go slower and I hear different engine sound.

MarkXr

No he means the hose from metering unit to turbo...... The one that's being sucked at by it's girlfriend Miss Garrett..

Dragsteer

ok but there are hard hose with steel inside if u know what I mean. So I think turbo cannot suck this hose at o.5 bar. If u mean that. So maybe is cam worn? Can simptoms which i wrote in first post be simptoms of worn cam? Fiecos dan said yes

Fiecos Dan

Could be a few things.

but it takes 1-2 hours to remove, check and re time a cam.

Drag_steer

yes. I will go see cam

Drag_steer

I think I solve problem...

before, I have boost 0.6 bar in second gear, which mean in 3th and 4th gear I will have more boost. I didnt feel cut off, because when I saw 0.7 bar in higher gears I change gear

so I turn down boost and now car driving fine, no strange sounds, no "handbrake up" feel.

Dragsteer

I again have same problem, but I noticed that problem which I describe in first post, is very common when car is hot. I really dont have idea anymore...

Fiecos Dan

so what have you checked/changed since trying to sort?

Dragsteer

I have this problem since I bought car. I set fueling at full throttle at about 12:1 , idle mixure is ok, I check belt, timing is ok, ignition timing is set to about 12 degrees, changed sparks, cables, boost hoses. And again, when I suddenly push throttle, for example driving at 2000 rpm in 2nd gear,and flor it, engine wont pulling so good, expecially when engine is hot. Goes good, and at about 3000 rpm starts do like I pull handbrake.like I give it to much gas, and engine start to choking.but sparks are coloured like rust or chocholate. I dont know what to see.next on my list is see cam. I dont have other ideas.

Fiecos Dan

No point keep asking the question if you dont do anything since the last time you asked.



CHECK CAM............




How are you measuring the AFR?

Dragsteer

With wide band lambda while driving. Will check cam and tell here results

Fiecos Dan

so whats the afr when its bog's?

Dragsteer

AFR on full throttle, at about 4500 - 5000 rpm on 0.5 bar , is about 12.3

Fiecos Dan

So whats the AFR when the problem is happening?

Dragsteer

It is the same. I didnt see difference in afr. This problem I dont noticed every time. I will go check cam soon