TD4 Starting problem
Posted 20 August 2011 - 03:41 PM
Over the last few days my TD4 has been getting harder and harder to start. It used to be two engine turns and it started, now it's more like 5 seconds or more cranking. I initially thought glowplugs. The warning light on the dash does not illuminate.
I have checked the glowplugs (ok), wiring to plugs(ok), glowplug relay in e-box(ok), fusible link (ok), relay coil power (ok), ECM to relay coil link (ok).
I get no demand from the ECM (the voltage on the ECM output at the relay coil is constantly at battery volts whereas it should drop to 0V to energise the relay. The relay itself works ok and can be energised with a jumper link and the plugs heat.
I am getting to the conclusion that the ECM is not asking for glowplug power, so my question is.... What makes the ECM decide to fire up the plugs?
I've read various sensors on a code reader and the all present plausible values.
Posted 20 August 2011 - 03:42 PM
08/2001 TD4 5dr Auto
Posted 22 August 2011 - 12:07 PM
In a UK summer the glows are not needed for starting,but the ecu may chose to use them to lower emissions after starting.(Without putting the lamp on.
Posted 23 August 2011 - 02:09 PM
Once it finally starts it is absolutely fine.
I've had a listen to both LP pumps. The one in the tank makes quiet pump type noises and the one by the filter in the engine bay seems to gurgle quite a bit (more than I remember).
I have a spare fuel filter in the garage, so I'll swap that out.
Posted 23 August 2011 - 02:15 PM
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Posted 24 August 2011 - 11:45 AM
Maybe worth getting the Injector leakback ckecked.
Posted 11 September 2011 - 03:43 PM
Turns out it was the in-tank pump that had failed. It wasn't too hard to change, but what horrified me was the big black flakes of gunge in the bottom of the tank!
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