1998 Mazda 626 Mazda 626 diesel don't start after long runn

Tiny
A2SISTEMI
  • MEMBER
  • 1998 MAZDA 626
  • 4 CYL
  • 2WD
  • MANUAL
  • 324,000 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
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Tuesday, April 29th, 2008 AT 4:49 AM

11 Replies

Tiny
BUZZSAW
  • MEMBER
I would say the pump is bleeding down or out of time like a distributor in the older cars
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Tuesday, April 29th, 2008 AT 3:51 PM
Tiny
A2SISTEMI
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You are speaking about the tank electrical pump (there I suspect) or the high pressure pump?
Alberto
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Wednesday, April 30th, 2008 AT 4:29 AM
Tiny
BUZZSAW
  • MEMBER
You are speaking about the tank electrical pump (there I suspect) or the high pressure pump?
Alberto[/quote:f2e0485a1e]

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
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Wednesday, April 30th, 2008 AT 9:50 PM
Tiny
A2SISTEMI
  • MEMBER
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.
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Friday, May 2nd, 2008 AT 4:52 PM
Tiny
BUZZSAW
  • MEMBER
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.[/Quote:334892b71f]

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
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Saturday, May 3rd, 2008 AT 2:45 AM
Tiny
RUI RIBEIRO
  • MEMBER
I have a Mazda whit the same problem. I need to know if you have the solution for the problem?
Thanks
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Sunday, March 8th, 2009 AT 6:52 PM
Tiny
RUI RIBEIRO
  • MEMBER
I need help, because here in my country no budy knows the problem, my car don t runn when is warm. I verify everything all sensors but nothing is wrong, I don t understand.
Thanks.
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Sunday, March 8th, 2009 AT 7:21 PM
Tiny
PETER0038
  • MEMBER
Hi,
From my experience with the 2.0TD engine (98-02), the problem is most likely that some rubber parts have perished which are part of the diesel pump. The diesel pressure is lost so the car doesn't start. A good diesel specialist should sort this out without major expense.
Peter
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Tuesday, March 17th, 2009 AT 5:44 PM
Tiny
RUI RIBEIRO
  • MEMBER
Hi,
But if we take off the temperature sensor the engine start, I don t understand why.
Here in Portugal there are not a solution and I don t know what doing next. The car only have 153800 KM.
Rui
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Wednesday, March 18th, 2009 AT 9:07 PM
Tiny
YCHAKAROV
  • MEMBER
Hi there I have the same problem and a workaround but not solution.
I believe that this is connected with the Denso diesel pump.
When I bought the car 1998 2 liter mazda 626 the engine was working on emergency mode. There was a brown wire to a sensor next to the denso pump was cut. I connected the wire and the car had issue to start the engine when is hot.
Then I made a manual switch that I can change when the brown wire is connected once the engine start.
It is not the best way, but since it works I prefer this than Denso repair that is very expensive.
If somebody is interested I can give more details.
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+1
Tuesday, February 7th, 2012 AT 9:04 PM
Tiny
RIVERMIKERAT
  • MEMBER
What's most likely happening is that the heat of the engine compartment is vaporizing the fuel because the pump pressure is insufficient to keep it liquid.
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Wednesday, February 8th, 2012 AT 12:17 AM

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