 | Home > Puma (Tdci) > Turns over but not firing |
 
|
|
|
| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16858   
|
Doubtful. It is strange behaviour, and the fact that it is worse when hot is unusual (usually hot engines start better than cold). It does make me wonder whether it is a heat-related electronic malfunction, but this could be very difficult to find scientifically.
If it was crankshaft position sensor related I think it likely that the engine would stall (a faulty CPS is one thing which will usually kill a modern engine since the ECU can't determine when to fire the injectors), so the camshaft sensor would have seemed the more likely. Fuel pressure bleed-off from the common rail could do it, since it would take more cranking to get the pressure up, but I can't see how this would be worse hot than cold. I would actually be tempted to try changing the infamous Achilles's Heel of the fuel system the VCV, since it is famous for causing all manner of strange faults without triggering any DTCs, and it could well be affected by temperature. Generally it is the first thing I change if there inexplicable engine malfunctions with no fault codes. It could possibly be sticking when hot. |
||
20th Sep 2021 9:03pm |
|
| Greyman110 Member Since: 29 Sep 2017 Location: London Posts: 323
|
Thanks for the comprehensive answer.
I changed the VCV this year when I was hoping that it wasn’t my head gasket so I don’t think it’s that unless its a dodgy unit. I’m taking out back to the garage next week so I’ll see what they can find. |
||
|
20th Sep 2021 9:51pm |
|
| Greyman110 Member Since: 29 Sep 2017 Location: London Posts: 323
|
So not wanting to be beaten, I went back to the car today.
I pulled relays, jiggled them around and did a test drive. Cold it started first time on the second crank at 168rpm which was probably about 1 second. The drive was flawless, no flat spots and felt spot on. Got home and turned off. Waited about 30 seconds and tried to start it and it just turned over with no hint of firing up. Tried this several times letting it turn over for between 5-10 seconds each time. Then I reset the car by locking it and waiting to the alarm light on the dash to stop flashing before unlocking and trying to stat again. Once again nothing happened so I feel I’ve eliminated the possibility that its the alarm. Both times I tried starting from just the cranking battery and linking my batteries together. So overall really annoying 
Not really feeling that I should be replacing things as this only started after having the head gasket replaced so what could have happened that could cause this? I spent half the day googling this and it seems like lots of people have this issue but it can be caused by different things so not one clear answer.  |
||
|
24th Sep 2021 7:50pm |
|
| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 19535
|
Check battery clamps are tight, and the main battery ground is clean and torqued correctly.
Worth checking the IPAC (instrument cluster) rear electrical connector is secure also. If you run the UG permanently, disconnect it and leave it disconnected for some time and see if the issue goes away. Finally as Blackwolf mentioned, the VCV can be culprit to causing this. The only times I’ve had cutting out or stalling issues have been battery clamp, main ground to transfer box or VCV failing. The clutch switch going under can cause issues but that’s usually power surges during gear changes. Fuel pressure and injector pressure issues could be fuel pump related, again where there VCV is located. Where did you get the VCV from? Did this issue start after you changed it or a few months later or did you have these issues before? Diesel$ Live$ Matter. ⛽️🛢️👨🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧 |
||
|
24th Sep 2021 8:50pm |
|
| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3188  
|
If starts no problem from cold, but not when hot, could be something with the heaters? Perhaps somehow it need the heaters to glow to ignite the fuel? Have you tried to bump start it when hot, see if the engine is turning over faster it would fire up?
Did you replace head gasket like with like for thickness? 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing 2012 90 CSW, 2.2TDCI, Santorini Black |
||
|
24th Sep 2021 9:28pm |
|
| Greyman110 Member Since: 29 Sep 2017 Location: London Posts: 323
|
Thanks for the new points to look at.
I’ll check the battery and ground tomorrow just to be on the safe side. I’ll check the IPAC but at the moment I dont know where it is so I’ll have to look at that. The UG wasn’t plugged in when I first noticed this issue. Actually when I first picked it up after the head gasket, it would never start on the first turn, always the second. Then I took it back and they replaced the diesel return pipe and then it started on the first turn when cold. I picked the VCV up on eBay and fitted it in Jan. This issue started last month. |
||
|
24th Sep 2021 9:34pm |
|
| Greyman110 Member Since: 29 Sep 2017 Location: London Posts: 323
|
Head gasket was replaced by an established LR independent so I would hope they used the correct parts.
|
||
|
24th Sep 2021 10:29pm |
|
| Greyman110 Member Since: 29 Sep 2017 Location: London Posts: 323
|
Before I go and buy a fuel priming kit…could it be that the system hasn’t been primed properly and after warning up there are bubbles in it?
If that was a potential, would I be able to feel that when driving? |
||
|
25th Sep 2021 8:39am |
|
| Greyman110 Member Since: 29 Sep 2017 Location: London Posts: 323
|
While looking around the engine I noticed that the where the injectors are had pools of something I didn’t recognise around them.
 Click image to enlarge Click image to enlarge Could this be the issue? |
||
|
25th Sep 2021 11:59am |
|
| Greyman110 Member Since: 29 Sep 2017 Location: London Posts: 323
|
Interestingly I soaked it up and it cleared 5 of the 7 not tested nanocom faults
|
||
|
25th Sep 2021 12:24pm |
|
| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
metal fuel pipes nuts loss or plastic spill fuel line fitting o ring split
 |
||
|
25th Sep 2021 1:10pm |
|
| Greyman110 Member Since: 29 Sep 2017 Location: London Posts: 323
|
I've tested the car a couple of times now and theres no sign of anything leaking.
I'm also able to strat the car when its warm although I have to turn it over for about 5 - 10 seconds. So now I'm thinking could the injector housings be full of somethihng thats stopping the start? |
||
|
27th Sep 2021 10:08am |
|
|
|
| All times are GMT + 1 Hour |
< Previous Topic | Next Topic > |
Posting Rules
|
Site Copyright © 2006-2024 Futuranet Ltd & Martin Lewis
