Hard starting morning summer

[Passerat]

Hello everyone. Since the heatwaves, my Jeep has been having more trouble starting in the morning when it’s very hot. What could this be caused by? It starts on the second turn of the key, but not on the first.

I use ethanol gasoline.

Before the heatwave it was firing instantly.

Otherwise once it is started it works nice.

Thanks a lot

 

[AndyG]

Haven’t heard of this I think. Maybe someone can chime in. Does France get hot often?

 

[Passerat]

These last few days have been the hottest ever recorded

 

[macleanflood]

I'd be checking fuel pressure through the starting procedure.

Monitoring battery voltage through starting looking for abnormal drops.

Do you have a insulation on your fuel rail like a DEI fuel rail kit?

I cerrokoted my intake and exhaust to lower operating IATs...as an aside...

Also good time to clean up grounds.

Might want to inspect the injectors... replace the o-rings and look for cranks or large differences in impedance between them.

Bon chance.

-Mac

 

[macleanflood]

These last few days have been the hottest ever recorded

How many Cs?

-Mac

 

[IAmMadRobot]

I'd be checking fuel pressure through the starting procedure.

Monitoring battery voltage through starting looking for abnormal drops.

Do you have a insulation on your fuel rail like a DEI fuel rail kit?

I cerrokoted my intake and exhaust to lower operating IATs...as an aside...

Also good time to clean up grounds.

Might want to inspect the injectors... replace the o-rings and look for cranks or large differences in impedance between them.

Bon chance.

-Mac

Is there a DIY cerakote that works or do I have to take it to someone?

 

[macleanflood]

Is there a DIY cerakote that works or do I have to take it to someone?

I took it to a powder coating company. Many of us have. Probably could figure out how to DIY it.

-Mac

 

[Passerat]

Thanks a lot for your answer,
Now it's 45 ° Celsius.

Do you think the problem is something like vapor lock ?

Once the engine has started in the morning, I can let it sit for few hours it will fire instantly.

The problem is when it's very hot outside and engine cold...

 

[KennethS]

Starting easily on the second try is a symptom of a leaky fuel check valve. Instead of trying to start the engine on the first attempt, turn the key on / off / on /off then turn to the start position. This will help build pressure so the engine fires easily.

 

[Passerat]

Thanks a lot, I will try this tomorrow morning !

Can high temperatures reveal a pump problem that was working fine when it was cold ??

 

[KennethS]

I don’t know. It never gets cold here.

 

[macleanflood]

Can high temperatures reveal a pump problem that was working fine when it was cold ??

Yes and other things.

-Mac

 

[Passerat]

Yes and other things.

What are the other things ?

 

[macleanflood]

Pump problem coupled by hot temperatures vaporizing gasoline that's probably mixed for a lower temperature and optimized for clean burning. Add in old injectors, crispy o-rings, maybe a questionable fan clutch, an old water pump...

I'd start with fuel pressure. Conjecture is just speculation. We need data.

-Mac

 

[KennethS]

Pump problem coupled by hot temperatures vaporizing gasoline that's probably mixed for a lower temperature and optimized for clean burning.

That is a valid observation. With ambient temperatures 30F above normal the fuel blend is wrong.

 

[macleanflood]

Here in the Oregon coast if we get a particularly cold winter day the diesel mix they use here can gel.

I don't think that the gas is the only problem...

-Mac