Originally Posted by
crt560
Hi,
I have an annoying problem with my TD5 Auto which I thought I would post to see if anyone else has had the same problem and fixed it. Overall, vehicle performs really well, pulls like a train at 100kph, but...
Symptoms:
1) After driving the car and parking for say 15mins on the driveway, I start and attempt to move the car into my garage. There is virtually no response from the engine if I give it 100 % pedal - engine speed reaches about 1100rpm. My driveway has a low to medium uphill slope.
2) Pulling away at a roundabout or junction, there is about a 2 second delay before anything happens, then all hell breaks lose when rpm gets above 2000. This delay is reduced if I turn off the A/C system.
3) The lag is more than classical turbo lag, it appears to be some form of fuel reduction.
Checks.
1) I serviced the engine. Air filter, fuel filter, oil filter. Checked intake hoses, PCV and cleaned intercooler. Replaced intercooler as it had a slight leak on the intake.
2) I cleaned the MAP sensor and the MAF sensor. Checked wastegate operation and boost pressure.
3) I pinned out all the sensors to the ECU, did the oil check on the red ECU plug and found that everything seemed to be working. Fuel temp, air temp, air pressure, coolant temp., pedal potentiometers etc.
4) Started vehicle and looked at MAF voltage. Idle was 1.94V and no load 2250rpm was 2.54V. Also checked the resistance across pins 2 and 3 of the MAF and got 16.75 kOhms.
5) Disconnected the EGR system by blanking the vacuum pipe and ensuring the valve was closed.
I would have thought that there should be more than enough torque to overcome the AC compressor so there must be some other badness at work. The only thing I can think of is that the MAF readings are too low but I have already tested with it completely disconnected and there was no difference. Maybe a replacement MAF will sort it out ? Well I bought a cheap replacement one off eBay and that made no difference either...
Unfortunately I don't have access to a Nanocom and I don't really want to buy another MAF (I'll get the Siemens part next time) if I'm not sure if it will fix my problem. Does this sound like a familiar problem to anyone ? Anyone know where I can buy a Nanocom or borrow one ? Maybe there is a stored fault code which is resulting in some defaults being used. Was thinking about putting a 2.5V on pin 2 of the MAF sensor just to make sure that the sensed airflow was high enough. Ideas ?
Thanks.
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