hot start prob

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drkwack

Member
Posts
39
Hi. does getting the p38 diesel chipped cure the hot start problem or is there another way round it? ta.
 
No.

It's normally caused by wear in the pump. You can fit a kit that switches the heaters on every time. You could have your pump refurbished. You could try a little adjustment of your pump. It all depends on your knowledge and your wallet.
 
Poor battery, poor connections and fuse box problems will also cause hot start problems. Low cranking speed can often be the culprit. Also check your in tank pump is working and your leak off pipes are OK.
 
For the hot start problem, I am awaiting delivery of an 8mm one way valve from fleabay to fit between the filter and FIP. Theory being that it looses priming, when heater plugs come on the intank pump also runs to prime it. I saw this solution in a thread dealing with glow plug replacement. I should have it tried in next few days and will post result.
 
dogsbody said:
No.

It's normally caused by wear in the pump. You can fit a kit that switches the heaters on every time. You could have your pump refurbished. You could try a little adjustment of your pump. It all depends on your knowledge and your wallet.
Click to expand...
At moment knowledge on 38a is minimal but have looked after and modded my 300tdi disco, so what adjustment it reqd on pump am also going totry fitting one way valve into fuel line.
 
fitted the one way valve but no good. next I will run intank pump seperate to glow plugs. if it works then I will try valve beside intank pump. when i cut pipe near filter there was not much diesel in it
 
mgmayo said:
fitted the one way valve but no good. next I will run intank pump seperate to glow plugs. if it works then I will try valve beside intank pump. when i cut pipe near filter there was not much diesel in it
Click to expand...

Your ****ing against the wind with all these silly fixes. First of all check that the lift pump is actually working. If your getting air into clear pipe from filter to FI pump. It is either spill pipes or O rings in fuel filter inlet outlet. It is unlikely to be the fuel leaking back into the tank. Change the spill off pipes and the O rings. Bleed the system properly. If that does not work. Get the FI pump timing reset, it moves as the chains stretch. Get the injectors serviced.
 
wammers said:
Your ****ing against the wind with all these silly fixes. First of all check that the lift pump is actually working. If your getting air into clear pipe from filter to FI pump. It is either spill pipes or O rings in fuel filter inlet outlet. It is unlikely to be the fuel leaking back into the tank. Change the spill off pipes and the O rings. Bleed the system properly. If that does not work. Get the FI pump timing reset, it moves as the chains stretch. Get the injectors serviced.
Click to expand...

just a quick one wammers how much does it cost to have injectors serviced,and where can i find somewhere to do it?,my local 4x4 centre does not service injectors but can supply new.
 
Yes as Data says, Diesel bob. Do a search, last time i heard it was £28.00 per injector + vat but vat was 17.5 % then. You will have to remove them and send them to him for servicing, he does not do exchange.
 
Last edited:
wammers said:
Your ****ing against the wind with all these silly fixes. First of all check that the lift pump is actually working. If your getting air into clear pipe from filter to FI pump. It is either spill pipes or O rings in fuel filter inlet outlet. It is unlikely to be the fuel leaking back into the tank. Change the spill off pipes and the O rings. Bleed the system properly. If that does not work. Get the FI pump timing reset, it moves as the chains stretch. Get the injectors serviced.
Click to expand...

Stretched chains seems like the most plausible explanation in my case (I too suffer from the hot start issue). Do I need to take it to LR to get the inj pump timing reset, or should any diesel engine specialist be up to the task?

I am not interested in any of the bodges, I would like to find the root cause and fix it if poss, if it is the inj timing drifting out for example then presumably that would affect engine efficiency all the time (albeit maybe not by a lot!). My car claims only to have done around 80K miles, does the chain wear enough at this mileage to cause the hot start issue?

BTW regarding the leak off pipes, which seem to be mentioned a lot on here, is the problem that they allow air in or diesel out? There is no smell of leaking diesel from my car, so can I assume they are OK? If not how do I check them?



Cheers,

Jerry
 
jerrytlr said:
Stretched chains seems like the most plausible explanation in my case (I too suffer from the hot start issue). Do I need to take it to LR to get the inj pump timing reset, or should any diesel engine specialist be up to the task?

I am not interested in any of the bodges, I would like to find the root cause and fix it if poss, if it is the inj timing drifting out for example then presumably that would affect engine efficiency all the time (albeit maybe not by a lot!). My car claims only to have done around 80K miles, does the chain wear enough at this mileage to cause the hot start issue?

BTW regarding the leak off pipes, which seem to be mentioned a lot on here, is the problem that they allow air in or diesel out? There is no smell of leaking diesel from my car, so can I assume they are OK? If not how do I check them?



Cheers,

Jerry
Click to expand...

There are two settings for pump timing, one for vehicles with upto 20,000km on them, and one for vehicles with above 20,000km were the chains will have stretched. Any diesel specialist should be able to set timing. This is done to thousandths of an inch and is a critical setting. Also if you have 80,000 miles on it then your injectors could need servicing. On a petrol vehicle the engine will have had a few sets of spark plugs, each set will have been out and cleaned several times at that mileage. People with diesels think the injectors keep their settings forever, they don't. If you look at RAVE technical bulletins the hot start problem is recognised as a fault and is delt with, i suggest you read through it.
 
Thanks for all the advice, this is much appreciated, one other problem I have with this car is, after changing the head and gasket the engine now sounds very tappety, any ideas????????? again thanks for your help, its had new oil/filter and diesel filter and new spill pipes.
 
drkwack said:
Thanks for all the advice, this is much appreciated, one other problem I have with this car is, after changing the head and gasket the engine now sounds very tappety, any ideas????????? again thanks for your help, its had new oil/filter and diesel filter and new spill pipes.
Click to expand...

When BMW engines go tappety it sometimes helps to hold them on high RPMs for several minutes. If that does not help new tappets i am afraid or strip and clean them.
 
Cheers, Wammers, you say clean them, does this mean stripping them out of the head ? if so how? again thanks for the help
 
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