Am I being done like a kipper?

[polty16v]

Hi all, I've had a volvo 1.9 T4 lump installed in a clio (valver) for a good few months now but not got quite as much use out of it do to a particular problem:
Ever since day one I've had what feels like the mother of all flat spots at 1800 - 2000rpm, it's real ugly. I'm running an Omex ECU and with help from the tuner it is understood the ecu is loosing synchronnisation with the flywheel when the problem occurs (every time you go through the revs). He has told me to go away and check my wiring.
After checking this and knowing that a new crank sensor has been installed i am now left thinking the ecu is at fault? Any ideas as i'm beginning to lose faith and i've invested a good proportion of student loan into this!

 

[Fred@BTM]

is the sensor close enough to the trigger wheel?

 

[polty16v]

I can only assume so, it's in the standard position and I've had both a renault specialist and the a tuner to look at it. Seems strange as its fine through the rest of the rev range. Maybe i should get the ecu checked?

 

[Fred@BTM]

where is the ecu installed out of interest?

 

[polty16v]

Hidden inside the dash.

 

[Fred@BTM]

i would check the air gap between the crank sensor and the trigger wheel/fly wheel

i did one and itwas running like a bag of s**t, turned out the air gap was too big (i think it must be about 1mm)

 

[ben_p]

who mapped it?

 

[polty16v]

A place called autotune in Newcastle upon tyne. He's tuned all manner of stuff, and is well rated. I'll check the gap between sensor and flywheel.

 

[bmh.01]

Surely it'd run rough throughout the range if it wasn't detecting the crank pulses properly? A flat spot would come down to mapping wouldn't it?

 

[polty16v]

Surely it'd run rough throughout the range if it wasn't detecting the crank pulses properly? A flat spot would come down to mapping wouldn't it?

I wish i knew, think i may have to take it to an alternative tuner. The rest of the range is great, the problem is just between 1800-2000rpm. I've just printed off the whole Omex ecu guide in a hope to learn a little more about it, it'll make great late night reading!

 

[polty16v]

Crank sensor is 0.5mm away from the flywheel as per the manuals instruction, maybe I've a faulty sensor?

 

[Revman]

It's very easy to check if the ECU is losing sync. Ring our office and speak to Andy Cornock who will tell you how to check. 01242 681044. We're back in Tuesday after AutoSport at the NEC. However a flat spot is normally down to mapping, the ECU losing sync would cause the engine to not run at all at that particular RPM.

 

[polty16v]

It's very easy to check if the ECU is losing sync. Ring our office and speak to Andy Cornock who will tell you how to check. 01242 681044. We're back in Tuesday after AutoSport at the NEC. However a flat spot is normally down to mapping, the ECU losing sync would cause the engine to not run at all at that particular RPM.

It's definately loosing sync, i've watched the real time log too. Much appreciated. The question is 'what do i do next?'
I don't like to say it but the people involved have ran out of ideas.

 

[Revman]

It will be one of a couple of things. Ring the office in the morning. We can probably sort it out over the phone. If not how far from our Cheltenham office are you?

 

[polty16v]

A fair stretch up in the north east of england. I'll ring tomorrow and see what can be done. Thankyou for your help in this matter, i was beginning to lose faith!

 

[Andy GDI]

dont see this being a major problem..

if you have the logfile, pop it over via email.

have you got anywhere with this?

Andy Omex/GDI

 

[edgeydt50]

i would have sold the car if it had taken a year to sort out!