Jump to content

TD4 Starting problem


RJF

Recommended Posts

Hi,

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.

I'm confused

Rob.

Link to comment
Share on other sites

Sounds like low fuel pressure on the low side of the system,which can be down to several things.Common causes are failing low pressure electric pumps,blocked filters,failing pressure regulator on the high pressure pump or excessive leakback through one of the injectors.On live data the fuel pressure should be above about 280-300pa and not drop off too much when revved.

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.

Link to comment
Share on other sites

Thanks.

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.

Thanks,

Rob

Link to comment
Share on other sites

  • 3 weeks later...
  • 6 years later...

Hi

Did you find the problem?I have the same problem on my freelander.I have a freelander 53 plate Td4 and start hard when it's cold or hot.When the engine is cold, the power is fluctuating,but after the engine reaches its working temperature it works perfectly and pulse like a train.but the engine still starts hard.I checked glow plugs,camshaft sensor, MAP sensor, all sensors around the engine and fuses,all right.I do not know much about this car because a week ago I bought it.Thanks

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We use cookies to ensure you get the best experience. By using our website you agree to our Cookie Policy