Trouble at 6200 rpm

[johnbear]

My Cerbera SP6 seems to hits a wall at 6200rpm, it starts chugging and takes forevery to get passed it and onto the rev limiter at about 7500rpm.

I've changed the plugs, coil pack, leads and upgraded the chip in the ECU - It's still there.

Any ideas?

[Far Eastender]

Could it be a faulty injector?

[fairclp]

Hi John,

Fuel blockage/fuel pumps related?

I thought you said that new ECU chip caused it to act funny at that revs?

That's a low redline? Because of new chip?

Cheers,

Paul

[Peppe]

Hi !

My Cerbera SP6 did like that last year. It was the cranksensor wire that was routed to close to the HT leads.

Check this topic:
http://www.pistonheads.co.uk/gassing/topic.asp?h=0...

My suggestion is that you hook up a computer with the newer version (yellow cerb in the background) of the SP6 software and make a recording of the realtime monitor window. Then it´s possible to scroll along the timeline and see what happens with the different values from the sensors.

Good luck
Peppe

[johnbear]

That's interesting. I'll route the HT leads tomorrow and give it a try.

Thanks

[icb]

Any excuse for not getting away from me!!

[johnbear]

Yer, Yer - I was robbed of 1300rpm!

I still think it's freeky how the cars are so close.

Went for a spin on the Evo triangle on Sunday, but when I got up there it was drizzling. Found a side road that was pretty good across the top the lake.

Thinking of organising a spin on the 30th. Still undecided about going on DA trip around scotland.

Cheers

John

[Peppe]

Hi Johnbear !

Have you solved the problem with your car yet ?

// Peppe

Edited by Peppe on Tuesday 4th September 18:30

[johnbear]

Hoping to get a chance to look at it tomorrow evening.

Cheers

John

[scooterscot]

Sounds to me like you have wear in the throttle bodies, try holding the car on a light throttle at about 50 mph in top gear and see if it has a flat spot and hesitation.If it does you have the classic signs of worn spindles. We do an exchange modified set which cures the problem. I gave the design to the factory but they only started using it about a month before they shut down.

[johnbear]

The problem hasn't gone away. I've seperated the cables but the problem is still there.

[johnbear]

It's still got the problem but don't get any MIL light warning.

Could it be the fuel pump beginning to fail?

[rickaad]

check to see if you have not disturbed vac pipe from manifold to inside of car

[johnbear]

It's not that as I am really careful to put it back.

[jasoncorn]

still got the prob ? or what fixed it

my tuscan hestitates at 6300 rpm and wont go further under load but will rev up freely then ?

[johnbear]

Sounds like the same problem. It will hit the rev limiter when not under load or occasionally when it's in first, but for other gears it's still there.

I've changed the chip so it's not that. I've moved the HT leads away from the crank sensor. It doesn't seem electrical as it doesn't die but just hasn't the power to go through 6200 rpm.

I think it is either the crank sensor but why would it only occur under load or the fuel system. Suspects might be the injectors or the fuel pump.

[Peppe]

Hi !

Sorry that you haven´t got the problem solved yet. Have you changed the fuel filter ? You find it in the rear left wheel arch. Change the fuel filter and give the car some injector cleaner, i use Redline´s injectorcleaner in my Cerbera every now and then.

Peppe

[johnbear]

I am going to change the filter and take the injectors out and send them down to TVR Power to get them flow tested.

[smithyl23]

just out of interest, when did you last get your top end clearances checked/adjusted? reason for asking is my T350 experienced similar symptoms, like really struggling at 6k+. Was really fearing the worst and turns out the clearances on one of my exhaust valves had closed up and the valve wasn't closing properly, thus losing compression.