 | Home > Tdi > Lazy start and rough idle when cold. |
 
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| Retroanaconda Member Since: 04 Jan 2012 Location: Scotland Posts: 2640  
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First thing to check is the fuel leak-off lines on the injectors, either perished hose or loose banjos depending on age. Very common on Tdis, and causes this issue if left for more than a few hours.
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27th Dec 2023 3:04pm |
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| Mdm Member Since: 11 Sep 2013 Location: Sunny Lancashire Posts: 1599 
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was the injector pump rebuilt?
easiest way to double check if fuel pipes are drawing air is feed from a small bottle of fuel in the engine bay. if it starts every time this way you know you have an issue on the feed side of things. if not then pump or up stream of that bit or on the return side |
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27th Dec 2023 4:47pm |
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| 8619simon Member Since: 04 Nov 2016 Location: North Wales Posts: 247  
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Is the timing OK? I had the same symptoms especially the white smoke on start up which then disappeared after a few minutes. Turned out the timing was slightly retarded. |
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27th Dec 2023 6:35pm |
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| Mean Green Member Since: 15 Sep 2011 Location: South Ayrshire Posts: 280
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Thanks for the suggestions. I will start with timing and work out from there.
The timing was checked after the engine was re-installed during the re-build, but wont hurt to double check. |
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27th Dec 2023 7:00pm |
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| johnlad Member Since: 18 Dec 2023 Location: Blackpool Posts: 54
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Mine was like that when the glow plugs had all failed.
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28th Dec 2023 8:42am |
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| Fossil Member Since: 23 Aug 2015 Location: Bolton Posts: 16 
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I would agree, glow plugs have to be a suspect and are easily checked for power getting to them, and continuity
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28th Dec 2023 9:40am |
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| Mean Green Member Since: 15 Sep 2011 Location: South Ayrshire Posts: 280
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Can someone sense check my thoughts on the 200tdi timing, it has been a long time since I last did this and cant exactly remember the details.
Am I right in saying that for the timing to be right, there are three things that can be checked... 1. the TDC line on the pulley should line up with the casting on the crankcase 2. the timing pin should slip into the slot on the FIP 3. the timing pin should slot into the slot on the flywheel. I started by lining up the pulley and TDC line - but the slot on the flywheel was not alingned with the wading plug hole and the pin would not go into the FIP. So i lay underneath looking up into the wading plug hole and had someone turn the engine until I could see the slot. When this was lined up, the pin also slipped into the FIP, but TDC was about 20mm or so away from the casting mark. Am i right in thinking that this would suggest that the timing belt has either slipped or has been misaligned when fitted and to fix it is basically a timing belt change ?? |
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6th Jan 2024 10:32pm |
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| bodstruck Member Since: 09 May 2020 Location: Wiltshire Posts: 908
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If it was a timing issue would it not run poorly all the time?
You may have eliminated the glow plugs as a cause already but the symptoms you describe are exactly the same as i had on my Puma some while ago. New glow plugs solved it. |
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7th Jan 2024 8:05am |
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| julian Member Since: 17 Feb 2017 Location: Devon Posts: 99 
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My vote is on drain back. The hole could be anywhere from the injector leak offs to a poorly sealing olive on the lift pump tails.
I always advise making up a bit of fuel line with clear nylon pneumatics pipe so as you can physically see any air. Failing that any way of connecting the return from the back of the IP to a short hose that you can dunk under the fluid level in a clear (coke) etc bottle and watch for air bubbles. To me your symptoms sound just like something not sealing up quite right and the hole not being big enough to cause issues when running, but just large enough to cause drain back. |
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11th Jan 2024 11:26pm |
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| Chris86 Member Since: 15 Jul 2014 Location: South Yorks Posts: 788 
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Hello,
Does the rough idle and smoke clear altogether? We have had a similar issue on a 300tdi, the keyway on the crank pulley was worn so the engine was able to minutely retard and advance itself, just fractionally. Made for lumpy idling when starting, when driven "normally" under load it was fine, then if you idled for a long-ish period or spent a long period coming down hill on engine braking the issue would return. Was a pain to track down. Chris |
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12th Jan 2024 1:02pm |
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| Mean Green Member Since: 15 Sep 2011 Location: South Ayrshire Posts: 280
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So had a minor disaster.
I have owned the 90 for 25years this year and it occurred to me that I cant remember ever changing the glow plugs (largely because it never really needed them and started on half a turn of the key everytime). So given the advice above, I thought, might as well change them for an easy fix... whats the worst that can happen!!! .. so it turns out the worst that can happen is a sheared glow plug - half of which is stuck in the head. So it now needs stripped down and the head off to get the remains of the glow plug out.   |
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22nd Jan 2024 6:02pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20331
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That sucks, that’s a real concern with glow plugs it really is.
When was the fuel filter last changed? ⭐️⭐️God Bless the USA 🇬🇧🇺🇸 ⭐️⭐️ |
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22nd Jan 2024 6:17pm |
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| julian Member Since: 17 Feb 2017 Location: Devon Posts: 99
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I've been driving mine with a stuck tip for some time. I keep thinking it will shoot out at some point, but it has not. I doubt yours will move at all, but worth soaking in wd-a-like and then going for a spirited drive before pulling the head? |
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23rd Jan 2024 2:01pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17363 
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There are kits and tools available for the removal of broken and stuck glow plugs, it is a very common problem.
The principle of operation is as described here (not that this article describes an OM606 though). https://www.instructables.com/How-to-remove-Broken-Glow-Plugs/ Another explanation: |
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23rd Jan 2024 2:37pm |
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