diesel engine hard start when hot

**fmark** · August 22nd, 2012 03:53 PM

magandang hapon mga sir. Meron kaming L300 van, diesel, kapag pinatay siya pagkatapos ng mahabang byahe, like 1 hr, taz start maybe after 15 mins, mahirap siya mag start/crank. ano kaya possible na problema?or normal lang na yun?

**limarj** · August 23rd, 2012 04:03 PM

try checking the following, battery terminal connectors(when not secured, loosens up when hot), Fuel filter and Air filter.

**Retz** · August 25th, 2012 10:34 AM

malamang problema na ang battery nyan.

**blue** · August 27th, 2012 09:09 PM

there are 2 issues: 1st is difficulty in starting but starter is cranking. 2nd no crank at all.

if 1, your battery and starter is ok but maybe you have problem in your fuel system, heater plugs, etc.
if 2, you need to check you alternator, battery, battery wiring for looseness, fuses.

hth!

**sotel** · August 27th, 2012 10:17 PM

bakit kung malamig nmn mga sir e madaling umandar?

**niky** · August 28th, 2012 11:06 AM

Typically, if an engine won't crank when hot, there's a sensor failure, or a hot condition causing it not to start... since it's an L300 with mechanical injection, the possibilities of a sensor failure are not so big.

Perhaps: 1. the engine has issues cranking when hot, and still needs the glowplug. But the glowplug won't activate when the engine is still hot.

Or: 2. The EGR is stuck open and the engine can't crank.

Or: 3. The engine needs the idle to be high, like it is when cold-cranking, to start properly. Another thing that won't happen (if it's automatic and not a manual choke) when the engine is hot.

**fmark** · September 9th, 2012 07:26 PM

Originally Posted by blue

there are 2 issues: 1st is difficulty in starting but starter is cranking. 2nd no crank at all.

if 1, your battery and starter is ok but maybe you have problem in your fuel system, heater plugs, etc.
if 2, you need to check you alternator, battery, battery wiring for looseness, fuses.

hth!

i have scenario 1 sir.what is the possible problem on the fuel system sir?i read some articles on the net something about fuel going back to tank, etc.

Originally Posted by niky

Typically, if an engine won't crank when hot, there's a sensor failure, or a hot condition causing it not to start... since it's an L300 with mechanical injection, the possibilities of a sensor failure are not so big.

Perhaps: 1. the engine has issues cranking when hot, and still needs the glowplug. But the glowplug won't activate when the engine is still hot.

Or: 2. The EGR is stuck open and the engine can't crank.

Or: 3. The engine needs the idle to be high, like it is when cold-cranking, to start properly. Another thing that won't happen (if it's automatic and not a manual choke) when the engine is hot.

what is EGR sir? do you mean setting the idle to higher rpm will help in starting?

**shelu** · October 19th, 2012 12:16 PM

i had this same problem with my FB L300 before, its a grounded rotor in the starter. re wiring ng starter yan brod.

**LN106G** · October 19th, 2012 01:53 PM

the wire brush of your starter must have seen better days and needs replacement. Check also the wires leading to your starter as it may be loose....

**Jiggs** · October 19th, 2012 02:16 PM

agree on the above...during the days when we still have our jeepney..common problem yan. At starter and solenoid ang problema. You may need to have it cleaned or possible re-wind sa mga electrical shop.