↓ Advertise on Defender2 ↓

Home > Td5 > Surging and hesitations
Post Reply  Down to end
Page 5 of 5 <12345
Print this entire topic · 
achuakh



Member Since: 12 Apr 2012
Location: Singapore
Posts: 149

Singapore 2002 Defender 90 Td5 SW Oslo Blue

get the log, plot it in excel and you will know how much air flow vs boost you are getting.
A Td5 will get peak air flow around 2500rpm so that's what you want see.

What RPM are you having the issues around?

However, if you already feel no resistance on the waste gate, then i guess you should resolve that first.
On the standard turbo the waste gate opens when there's enough pressure against it and should be closed by default. it's purely mechanical to prevent over boost (unlike the disco which has an electronic modulator as well) and if the over boost condition still happens then the ecu cuts fuelling in its last attempt to lower the boost which results in it jerking.

If you had one of those boost cheater circuit installed, they limit the reading to 0.99 or 1bar and in the map, this is reflected. so if you remove the cheater circuit and keep the map, then it's going to say "oh, we are over 1bar now, let's pull back on the fuelling as we have exceeded the limit". Again, this depends on how it was written and I would need to look at the map before i can comment further.

I'm assuming again that you have a VGT if it's a "stage 2" remap, like what you mentioned in the earlier post.

Easiest thing, just load the original map back on the ECU to see if the problem goes away.

if you can provide the log and map, i can help you read it. From the land of the most expensive land rover defenders on planet earth. At 125k for a XS 110 csw and you get to own it only for 10yrs! Please find me a good reason to stay on this island.

Post #840706 30th Jun 2020 3:50pm
View user's profile Send private message View poster's gallery Reply with quote
Dexterdog



Member Since: 23 Jun 2018
Location: gloucestershire
Posts: 99

Thanks for the reply and offer of help, much appreciated.

I am sure that actuator (or wastgate) is not moving so I am going to replace the actuator first and will report back

Post #840711 30th Jun 2020 3:59pm
View user's profile Send private message View poster's gallery Reply with quote
andylee



Member Since: 29 Jun 2016
Location: London
Posts: 6

United Kingdom 

Hi guys Ive been following this thread as I have the same issue on my 2003 TD5 90. How was the issue resolved ?

Post #845739 24th Jul 2020 5:10pm
View user's profile Send private message View poster's gallery Reply with quote
Dexterdog



Member Since: 23 Jun 2018
Location: gloucestershire
Posts: 99

Hi,
Its not solved yet.
Still searching. Slight delayas clutch has now gone
I will post once I get to the bottom of it to share what we find.

Post #846145 26th Jul 2020 3:54pm
View user's profile Send private message View poster's gallery Reply with quote
andylee



Member Since: 29 Jun 2016
Location: London
Posts: 6

United Kingdom 

New fuel pump solved the issue for me.

Post #851354 21st Aug 2020 10:26pm
View user's profile Send private message View poster's gallery Reply with quote
andylee



Member Since: 29 Jun 2016
Location: London
Posts: 6

United Kingdom 

Although after saying that a new fuel pump had solved the issue for me, the hesitation is still present at low revs with a cold engine, as well as that, it sounds a bit like a tank for a short while until up to temperature. Once the engine is at full working temperature it runs like a dream, so sorry the search continues.

Post #856333 16th Sep 2020 7:14pm
View user's profile Send private message View poster's gallery Post Reply
Post Reply  Back to top
Page 5 of 5 <12345
All times are GMT + 1 Hour

Jump to  
Previous Topic | Next Topic >
Posting Rules
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



Site Copyright © 2006-2020 Futuranet Ltd & Martin Lewis