Author Topic: Calibra Turbo 4x4 C20LET using lots of fuel and not accelerating as usual?  (Read 1743 times)

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Offline Red Mosquito

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My father has a Calibra Turbo in Spain that is not performing properly.

The vehicle apparently makes a hell of a noise when started up and sounds like "a vehicle that has had modifications" despite it never having any. The vehicle is using an awful lot of fuel and has very poor acceleration. The problem does get better after it has been running for a while.

A mechanic in Spain has identified the ECU as the problem however I wanted to check that no one here can confirm that is likely to be correct or advise if another issue which would cause this problem?

Reason being, I'm having a hell of a job locating a new ECU and a getting it sent back to the UK for an expensive refurb seems like the only option at the moment.

Offline tommygards

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could be the ecu, or is running on 3 cylinders.

Offline Bad Kid

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I doubt it's the ECU, I've never known one to fail in years of dealing with C20LETs

It's probably the most reliable part of the engine.
NURBURGRING CHALLENGE :-D

Offline Red Mosquito

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So if it's not the ECU, any idea what it could be? Someone has suggested it may be a temp sensor, likely to be any mileage in that?

Offline Bad Kid

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Have you flashed the fault codes from the ECU?
NURBURGRING CHALLENGE :-D

Offline Red Mosquito

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Doubtful. I'm in another country from where the car is and mechanic my old man has had look at it has said the ECU needs changing so probably not. Presumably the correct practice would be to flash the ECU for faults and then use the information it provides to solve the issue and if that doesn't work then maybe the  ECU is suspect.

Offline Martin.

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Problem with hot start valve?? if still connected! (bypassed mine)
Official Turbo register
http://www.clubcalibra.com/index.php?topic=34838.msg452964#msg452964


I have not failed. I've just found 10,000 ways that won't work.

Offline callyman

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As Ben said, it's highly unlikely to be the ECU

Can you get this link to them
http://www.topbuzz.co.uk/info/fault_codes/fault_codes.htm#bosch

You want to read the codes for the Motronic 2.7

Offline Red Mosquito

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Thanks for all the help guys. I will report everything back and send over that link before reporting back with progress. Cheers.

Offline TURBOHEAD

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I agree with comments above Re: ECU  fault.

When left to diagnose a problem with any engine it is all too easy to blame the ECU. Before ever drawing that conclusion the mechanic would have to rule out all mechanical or electrical faults. Even if all checks are ok the ECU would need to be tested by an approved auto electrician. ie is the ECU putting up fault codes, Is the eml light functioning, etc etc. etc.

Personally I would take the car to another garage for a second opinion tbh. replacements are expensive so add this cost plus garage hourly charge....... ::) >:( :'(

If however the mechanic were to swap the suspect ECU for a known good ECU and this solved probs: then he is talking sense.
It sometime is like finding needle in haystack but hey that's what mechanics are trained to do ain't it  :-\


Offline .rip

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If it is the ECU, it will 2 one of 2 things when you do the paperclip test:
It will know it is faulty & return the appropriate code.
It will not respond.

A few more details will be useful before jumping to any expensive suggestions.

What noise does it make when started? Does it stutter to life or what?

Offline marklwilliams

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Would suggest changing the Lamba sensor, mine went wrong. Mine failed the MOT on emissions, reading was 13% not less than 0.5%. it was also causing the to randomly smoke as well.

After it was changed it passed with no problems!

Offline TURBOHEAD

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I agree that the lambda sensor is a likely candidate given the symptoms but this would have flagged up on a FCR.

We do not have access to all the  information the mechanic in Spain has, that means we are unable to help fully as we would like to. :)

Fault codes however are not an exact science tbh,  It is only a small indication in the bigger picture to the mechanic. Just because a FCR flags up a fault it doesn't automatically mean a faulty sensor. The very low voltage signal back to the ECU will show only an open or closed reading which the ECU then compares with it's pre-programed map. If the ECU is unable to adjust the parameters it goes into limp mode.

The fault signal the ECU receives from a particular sensor or group of them can be as simple as a pos: + feed wire to sensor damaged, poor contacts in plug and socket, cracks to the insulation on wire, etc.

I had a fault code for TPS sensor, so bought a new one and fitted it...job done....well no. when fitting tps I moved harness to it
and only then noticed a bare wire snapped to tps. I re -soldered and heat shrunk joint.....this was now the fault...not the tps.
but the ECU didn't know this it just flagged up a sensor fault.

Reason I mentioned this is I now had 2 good tps sensors to add to box with several possibly good but discarded sensors.
After investigation of all the engine harness  it was so brittle due to age and heat that the insulation snapped when bent with my fingers.

The thing that concerns me is that the collection of various different engine sensors in the box, maybe if bench tested some could be Ok. They ain't cheep......might be glad I kept them  ;D

food for thought  8)

Offline c20t

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to me this sounds like an induction pipe is lose, its getting the wrong readings from sensors throwing more fuel and just chucking it out the back end, when you put your foot down does it splutter ?

Offline richiem

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Sounds alot like the car is running in safe mode due to a sensor failure ( mass sensor/ lambda sensor ect)   
If you blow of a boost pipe and the car refuses to run you can unplug the mass sensor and then the car will run on the highest settings as it senses a fault on a v.i.p sensor . This means even tho the car would not normally run it will do in safe mode by raising all the stats but by doin this it will have no power at all and use huge amounts of fuel..
I would think from the sounds of things the car is doin the very same thing as the syptoms of safe mode are as you have mentioned!   Im betting that when you do a code check you will find that one of the following sensors is at fault! ( cam sensor/ mass sensor/ lambda / knock/   ;)
back again with le turbo n050. Loving it!!!

Offline richiem

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The vehicle apparently makes a hell of a noise when started up and sounds like "a vehicle that has had modifications" despite it never having any. The vehicle is using an awful lot of fuel and has very poor acceleration. The problem does get better after it has been running for a while.

This above statement sounds like a car that is running way to rich and this is more noticable when the car is cold . The engine tone is alot lower when running rich and sounds alot deeper .. It prob improves when its warmed up because the fuel level is dropping once the temp sensor detects that the car is at running temp 8)
The high fuel usage and different sounding engine would poss point to over fueling and the crap performance/ power sounds like safe mode .
Last time i drove my cali in safe mode was coming home from santapod!  ( boost pipe blew off) .  I set the car into safe mode to get home ..
 Its only around 70 miles from me but i did half a tank of fuel and couldnt go any more than 60mph  :'(


back again with le turbo n050. Loving it!!!


 


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