problems warm starting after becm replacement

mjb.thomassen · Nov 1, 2019

p38 4.6 prince multipoint lpg 1994
After replacing becm (earlier thread) engine starts fine on petrol when cold en goes smoothly into lpg modus.
When warm it does not start on petrol until the engine cooled down fully.
I changed the crank sensor last year.I read that the car will start without most sensors so can it be only the crank sensor again ? or which other first step I have to take without turning in circles

Henry_b · Nov 1, 2019

Could be the CPS sensor cutting out when hot.

Hit it with some freeze spray.

Then try cranking her over.

Grrrrrr · Nov 2, 2019

Henry_b said:
Could be the CPS sensor cutting out when hot.

Hit it with some freeze spray.

Then try cranking her over.

That the freeze spray plumbers use?

Datatek · Nov 2, 2019

Grrrrrr said:
That the freeze spray plumbers use?

Or the freeze spray used in electronic fault finding.

Henry_b · Nov 2, 2019

Grrrrrr said:
That the freeze spray plumbers use?

The electronic stuff like Data says

Dopey · Nov 2, 2019

You could spray Isopropyl it will do the same thing.. dissipate faster in heat

Datatek · Nov 2, 2019

Dopey said:
You could spray Isopropyl it will do the same thing.. dissipate faster in heat

Doesn't cool enough

Dopey · Nov 2, 2019

Dissipates with heat though, why would you want it to cool things? you just need to know whats hot and whats not hot?

Datatek · Nov 2, 2019

Dopey said:
Dissipates with heat though, why would you want it to cool things? you just need to know whats hot and whats not hot?

Electronic components can suffer failure as they heat up and then recover as they cool, so a good spray with freezer can be used to prove if a component is suffering a heat related failure.

mjb.thomassen · Nov 3, 2019

I tried freeze spray, no result.ormal
Is it true that an abnormal sound of starter can be caused bij a faulty crank sensor .I changed the starter and ring on the flywheel two years ago.
When I start with cold engine I hear the starter only a bit at the end.When I start warm it seems as if the starter can t hold up with the flywheel.
I ll check the wires and otherwise a new sensor but the problem started the same day after replacing the becm

Grrrrrr · Nov 3, 2019

mjb.thomassen said:
I tried freeze spray, no result.ormal
Is it true that an abnormal sound of starter can be caused bij a faulty crank sensor .I changed the starter and ring on the flywheel two years ago.
When I start with cold engine I hear the starter only a bit at the end.When I start warm it seems as if the starter can t hold up with the flywheel.
I ll check the wires and otherwise a new sensor but the problem started the same day after replacing the becm

My starter always sounds the same. Hot starting issues on the diesel M51 engine are common.

Datatek · Nov 3, 2019

mjb.thomassen said:
I tried freeze spray, no result.ormal
Is it true that an abnormal sound of starter can be caused bij a faulty crank sensor .I changed the starter and ring on the flywheel two years ago.
When I start with cold engine I hear the starter only a bit at the end.When I start warm it seems as if the starter can t hold up with the flywheel.
I ll check the wires and otherwise a new sensor but the problem started the same day after replacing the becm

I doubt the BECM is at fault. If it's a pre-engage starter, they can stick in the engaged position, my Transit does that when cold and is OK when hot.
Hot start problems are common on the M51.

RangeRoller dt · Nov 3, 2019

How old is your starter? They usually go limp before bang.

Your battery tip top?

mjb.thomassen · Nov 4, 2019

replaced the starter and starter ring 2 years ago about 12 k km ago

problems warm starting after becm replacement

mjb.thomassen

Member

Henry_b

Think outside, no box required.

Grrrrrr

Technician, Bodgit & Scarper Ltd

Datatek

Well-Known Member

Henry_b

Think outside, no box required.

Dopey

Well-Known Member

Datatek

Well-Known Member

Dopey

Well-Known Member

Datatek

Well-Known Member

mjb.thomassen

Member

Grrrrrr

Technician, Bodgit & Scarper Ltd

Datatek

Well-Known Member

RangeRoller dt

Well-Sprung Member

mjb.thomassen

Member

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