hot starting issues

Rapido · 2021-06-25 17:57:15

Hello Jumpy fans,

My 2004 1.9d work horse has just 54k (providing no nefarious earlier owners, I wouldn't trust the dealer I bought it from in a lifetime. unfortunately, but that's another story) When this hot starting issue come on some months back I blanked the EGR, seemed to help but now it can take 6-10 bursts on the starter to get it going again. It's quite random, will start on the button from cold, stop at shop 2 mins away, won't restart for ages, other times starts fine all day or is a pig to start all day. When plugged in when issue first started no codes came up.

Not sure whether this is relevant....So I did the cambelt myself 3 years ago, (here we go!) should have twigged something not quite right as the engine light would come on intermittently. After perhaps another year running like this, I got the general feeling of lack of power and fuel economy so did the sensible thing finally and put it in garage and they reset the belt saying the fuel pump was a tooth out. Ran much better would you believe!
Could I have compromised the fuel pump, so when the pump is warm it does not seal so tightly?

Thanks for any mockery for my idiot mechanics

vaz2121 · 2021-06-26 06:58:12

I wouldn't have thought the pump was compromised it's just squirting in fuel.............
I'd have thought if anything the engine with fuel igniting and trying to push pistons in reverse [to early~advanced] because it fires the fuel before the piston is at top of it's stroke [TDC] ...........
A Disel is about thermal efficiency ... Hence the need for glow plugs to aid cold starts as the heat generated dissipates into cold metal ..........
{We are working with indirect injection [IDI] here rather than the if done properly the more efficient Direct injection [DI] it more difficult to get a small capacity engine to work acceptably with DI than IDI ... Hence why So many TDI Diesel cars sound so agricultural} .............
But you don't say whither advanced or retarded when one tooth out both will give a loss of power symptom ................

Diesels work in very similar principal to petrol but have no spark to ignite fuel just the compresion of the engine to make the air within the cylinder so hot the vaporised fuel ignites imidiately its injected in the cylinder and also hence why it has the Harry Ricardo swirl pre chamber [why it's classed as IDI] to aid the atamisation and burning of fuel producing more power, [ahem] A bigger cleanner bang for your buck and less given smoke............ [I digress]

If anything I'd say "A intermittent sticky when hot stop solenoid" ...........
But it's hard to give a prognosis on spec basicly ............

I think this from what you said in your description of behavour............
Plus Some solenoides just start to fail electricaly either hot or cold both even ..........
But here we have heat so different expansion rates of metal and for whatever reason and best known to the solenoid [Less and restrictive operating space] ........
The same is true of when cold and contraction of metal so larger space and easier to move within.........
Or less efficient solenoid operation when hot [less pulling/pushing power] and unable at times to cope ...........

Last edited by vaz2121 (2021-06-26 07:02:18)

kenbw2 · 2021-06-27 14:13:57

Hey kudos to you for doing stuff like that yourself. I always say I learn the most when I balls something up. Same applies here, and now you have more knowledge than you did before smile

You won't have damaged the pump, like vaz says it just drags fuel in and pushes it to the engine. The injectors aren't timed, they just open when the pump delivers a specific "cracking pressure" so they'll be fine too.

You can check if the pump is doing its thing by loosening the bolts that clamp on to the injectors. Try it on your hot start, if fuel spurts out, it's working

Rapido · 2021-06-27 20:26:34

Thanks for your excellent insights and knowledge chaps. I like the sound of the sticking stop solenoid I must say. I imagine they are designed to favour shutting off rather than not shut off!
Right dispatch this wont be too painful!

Rapido · 2021-08-08 18:32:20

Update.
I have the van back after local independent garage had van for about a week and although it came with the statement "all sorted" the results I feel are a bit inconclusive, I'll explain. So this is the work they did. Started by replacing the MAF, then coolant temp sensor, and finally the crankshaft position sensor. He showed me the old crank sensor and it looked like a burnt marshmallow from a quick glance, wish I had actually examined it properly, could it just have been clogged with dirt, just my ocd possibly. So the confusing bit is he said that when it is warm, to leave it 15 seconds after glow light goes out, possibly because the light relay is not accurate. I do feel the van is running a lot better though. And now I know the trick I do not sit there pounding it over ten times!

Pathfinder100 · 2021-08-08 19:34:06

This must be the third or fourth time I have seen a thread related to starting problems that was traced to the Crank Sensor. I wonder if a general issue exists with that sensor or the wiring for it.

AlvyLad · 2021-08-08 20:28:35

Pathfinder100 wrote:

This must be the third or fourth time I have seen a thread related to starting problems that was traced to the Crank Sensor. I wonder if a general issue exists with that sensor or the wiring for it.

I've had hot starting issue, no crank sensors changed, had to get a starter motor for mechanic to change, but what arrived (S.H.) wouldn't fit, so he took old one apart, cleaned all sorts put it back on, for until, another one arrived (- it improved little bit, but has remained little slow to turn when hot), and the second starter with new battery has been flawless, after changed for couple of years now...
Temperature on a crank sensor might play part, but doesn't make sense... But I'm not a mechanic.

Pathfinder100 · 2021-08-09 14:42:03

These were threads elsewhere on French sites, Quora, Fixya and some other randoms, while researching issues. That sensor has come up a number of times as the cause of problems.

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#1 2021-06-25 17:57:15

hot starting issues

#2 2021-06-26 06:58:12

Re: hot starting issues

#3 2021-06-27 14:13:57

Re: hot starting issues

#4 2021-06-27 20:26:34

Re: hot starting issues

#5 2021-08-08 18:32:20

Re: hot starting issues

#6 2021-08-08 19:34:06

Re: hot starting issues

#7 2021-08-08 20:28:35

Re: hot starting issues

#8 2021-08-09 14:42:03

Re: hot starting issues

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