Thread Rating:
  • 8 Vote(s) - 3.75 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Pulsing Idle
#1
1.9D DW engine. When I start the engine in the morning (i.e. when the engine is cold) it's taken to pulsing the idle. It's ok for the first few seconds but as soon as I apply any revs the idle goes erratic. It revs up to 1200rpm then drops to nearly 800 then back up to 1200 and so on. It's a very regular pulse though takes about 1.5 seconds to complete a cycle. Once the engine is up to temperature it's fine and remains fine all day.

Any ideas please?
Malc

Stupid computer!
Security system should not fail safe!
Security system should fail dangerous!
Reply
#2
Air leak at the inlet (manifold?) on the injector side? Possibly.
[fon‌t=Tahoma, Calibri, Verdana, Geneva, sans-serif]The Older I get the Better I Was!  Cool [/font]
Reply
#3
Ok so what do I do to find out if that is the case?
Malc

Stupid computer!
Security system should not fail safe!
Security system should fail dangerous!
Reply
#4
At this point I have to hold my hand up and say that maybe Rustscrat or one of the other extremely knowledgeable guys here will know.
If it was a normally aspirated petrol engine then I'd know but these diesels are foreign to me......sorry! :S
[fon‌t=Tahoma, Calibri, Verdana, Geneva, sans-serif]The Older I get the Better I Was!  Cool [/font]
Reply
#5
(24-06-2012, 11:48 PM)OlJeffers Wrote:  At this point I have to hold my hand up and say that maybe Rustcrat or one of the other extremely knowledgeable guys here will know.
If it was a normally aspirated petrol engine then I'd know but these diesels are foreign to me......sorry! :S

Ther is some kind of device that increases the engine revs at idle when cold, I presume controlled by some kind of sensor.

I would start there.

Peter
Reply
#6
(25-06-2012, 06:44 AM)Romahomepete Wrote:  Ther is some kind of device that increases the engine revs at idle when cold, I presume controlled by some kind of sensor.
That was my thought but I don't know where the sensor is.
Malc

Stupid computer!
Security system should not fail safe!
Security system should fail dangerous!
Reply
#7
(24-06-2012, 11:03 AM)OlJeffers Wrote:  Air leak at the inlet (manifold?) on the injector side? Possibly.


You can discount the air leak at Injector side as the older engines do not need an airtight seal between manifold and cylinder head to run.
The older 1.9 has a thermostatic controlled cold start lever on the fuel pump. There are a lot of posts about it and how to check and adjust.

The newer type rely on elctronics to monitor coolant temp. etc to ensure low emissions. An air leak at the manifold could upset the airflow meter and also the E.C.U. Confusedtudy:
Reply
#8
It's the later DW engine(54 reg) so all electronic control I assume.
A bit more info. When you start the engine from cold it will idle fine until you take some power from the engine. Say you twitch the steering, the power steering takes some power and this sets of the pulsing. Likewise it will idle fine until you rev the engine then it will start pulsing.
I'll have to investigate at the weekend.
Malc

Stupid computer!
Security system should not fail safe!
Security system should fail dangerous!
Reply
#9
I'm going to mark this as solved. I found a pipe that goes from the airbox to the front grill had come loose. It's a pipe with several longitudinal slits in it. Put it back in place and the problem seems to have gone away. Seems a bit unlikely to me but hey ho.

I also had a look at the fuel injection controller thingummyjug. It's mechanical control (much to my surprise). I gave everything that moved on it a lube with some Triflow silicone/ptfe lubricant.
Malc

Stupid computer!
Security system should not fail safe!
Security system should fail dangerous!
Reply


Forum Jump:


Users browsing this thread: 1 Guest(s)
Welcome, Guest
You have to register before you can post on our site.


  

Password
  





Search Forums

(Advanced Search)

Latest Threads
12v for lighter front
Last Post:ghost123uk
Today 02:59 PM
» Replies: 6
» Views: 135
Insurance!
Last Post:Col
Today 02:57 PM
» Replies: 9
» Views: 873
"Ultimate" type Diesel fu...
Last Post:ghost123uk
Today 02:48 PM
» Replies: 17
» Views: 400
2025 Diesel Ban
Last Post:rnamman
Today 01:58 PM
» Replies: 9
» Views: 134
2012 enterprise berlingo ...
Last Post:Solent
Today 01:47 PM
» Replies: 8
» Views: 169
Alloys
Last Post:Rich Walker
Today 01:36 PM
» Replies: 3
» Views: 113
1.6 16v petrol cambelt
Last Post:sks01773
Today 09:28 AM
» Replies: 4
» Views: 72
citroen berlingo desire 1...
Last Post:Trevor
Today 09:18 AM
» Replies: 3
» Views: 78
Berlingo won't start 2009...
Last Post:brodfather11
Today 06:20 AM
» Replies: 8
» Views: 212
B9 DPF Tank Top-Up
Last Post:Lighty
Yesterday 10:06 PM
» Replies: 5
» Views: 130

Locations of visitors to this page