Engine Mechanical problem
1998 Mazda 626 4 cyl Two Wheel Drive Manual 324000 miles
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I have a Mazda 626 2.0tdi dated 1998, over 300.000Km Is an european model
When the engine run for a long time, for example 1-2 hours of highway drive,if I stop it an restart , even within only some seconds, it never start again. The first times it happen, I need to wait 5-10 minutes, now I have to pass a intere night to cool down , and then restart. The only way to start the engine when is hot, is a starter spray (wurth fast start) in the air input (removing air filter). A garage man says that is the tank pump that have a pressure to low. This can be, but I don't understand how can the engine run for hours at 130km/h without problems, and stopping it for a second cause the no start. Any idea ?
Thanks a lot
Alberto

a2sistemi wrote:

Engine Mechanical problem 1998 Mazda 626 4 cyl Two Wheel Drive Manual 324000 miles ---------------------------------------------------------------- I have a Mazda 626 2.0tdi dated 1998, over 300.000Km Is an european model When the engine run for a long time, for example 1-2 hours of highway drive,if I stop it an restart , even within only some seconds, it never start again. The first times it happen, I need to wait 5-10 minutes, now I have to pass a intere night to cool down , and then restart. The only way to start the engine when is hot, is a starter spray (wurth fast start) in the air input (removing air filter). A garage man says that is the tank pump that have a pressure to low. This can be, but I don't understand how can the engine run for hours at 130km/h without problems, and stopping it for a second cause the no start. Any idea ? Thanks a lot Alberto

I would say the pump is bleeding down or out of time like a distributor in the older cars

Buzzsaw wrote:

I would say the pump is bleeding down or out of time like a distributor in the older cars

You are speaking about the tank electrical pump (there I suspect) or the high pressure pump ?
Alberto

a2sistemi wrote:

Buzzsaw wrote: I would say the pump is bleeding down or out of time like a distributor in the older cars You are speaking about the tank electrical pump (there I suspect) or the high pressure pump ? Alberto

diesels usually have pumps on the engine not in the tank, ran from the timming chain, in which they need to be timed like a distributor, i am not a masda guy but I though I would try to help

Buzzsaw wrote:

diesels usually have pumps on the engine not in the tank, ran from the timming chain, in which they need to be timed like a distributor, i am not a masda guy but I though I would try to help

You are right ! My 626 use only a Denso V5 pump, totally controlled by electronic. I've tested relais and FSOV solenoid and are ok. The spill valve have a resistance value different from service manual, but I'm unable to estabilish if it is damaged.

a2sistemi wrote:

Buzzsaw wrote: diesels usually have pumps on the engine not in the tank, ran from the timming chain, in which they need to be timed like a distributor, i am not a masda guy but I though I would try to help You are right ! My 626 use only a Denso V5 pump, totally controlled by electronic. I've tested relais and FSOV solenoid and are ok. The spill valve have a resistance value different from service manual, but I'm unable to estabilish if it is damaged.

with the miles you got out of it I would say the pump is weak, might want to look into a rebuilt one or go to the junk yard