My Defender 90 TD5 turns over fine, starts right away however there is a lag of 4/5 seconds before the engine picks up to full revs. This only happens when it has been sitting for a while such as first thing in the morning. Has anyone else experienced this or know what the likely cause could be.
Engine lag
- Thread starter Collman
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Turboman
Mab An Gov
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Probably just the engine warming up. Lots of diesels with a bit of wear run a bit slow until the combustion chambers heat up.
If it starts OK, and runs Ok when warm, it is probably fine.
I assume it is fairly cold where you are, although the location means nothing to me.
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Carlops isn't far from me, it's not that cold at the moment.
My 300tdi is the same, it takes a few seconds to warm up before it gets going too.
My 300tdi is the same, it takes a few seconds to warm up before it gets going too.
I did just that today; fitted a new injector harness at the same time. The old one was fine though and there was no oil in the plug or the ECU.
Turboman
Mab An Gov
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Shouldn't an Engine Management Light come on if the MAF fails?
If the MAF has failed would the car not be sluggish all the time rather than just on start up?
No, it runs poorly for a few seconds then the ECU reverts to default settings
Just unplug it and see if the fault clears. lf there's no difference at least you'll know what it isn't.
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lt doesn't even come on if you unplug the MAF
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I have a similar issue and assumed it was just a quirk of the td5 as I am used to older pre electronic diesels. I have exactly the same issue, starts first time every time but takes somewhere between 5-10 seconds before you can rev it up properly. If you do pull away in this time have low power and revs then it remedies itself and is back to full power. I had got as far as working out it was a fueling issue and it is not delivering enough fuel until it has settled after this initial period. I will try unplugging the maf and seeing if that makes a difference. I will also check the injector loom again although this was checked and was clean about 6 months ago and have had the issue since I started using the vehicle. I "get around" it by starting the engine as soon as I get in the vehicel and then by the time seatbelt is on and phone is plugged in satnav set etc it has settled and is good to go at full power.
I was thinking all the same things as you. I changed the injector loom at the weekend but it made no difference. It is always worse when it is very cold so I did add glow plugs to the list of possibilities. I too will try the MAF as I have occasionally noticed a lag in power when accelerating.
robbie the greatl
Active Member
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try draining water off fuel filter or fit a new one
Have you tried disconnecting the MAF unit yet
Takes ten seconds (once the bonnet is open!)
Costs nothing
Disconnect it, go for a drive and see what happens
lt's also a very easy part to change if it does turn out to be defective, takes about five minutes
Takes ten seconds (once the bonnet is open!)
Costs nothing
Disconnect it, go for a drive and see what happens
lt's also a very easy part to change if it does turn out to be defective, takes about five minutes
I did and it didn't make a difference to the delay I am experiencing on start up. It doesn't cause me any issues and has happily been like it for the last 18months so I plan on ignoring it and continuing as I have been.
