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Cold Start Issue

Tong Lu

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redwngr Senior Enthusiast

redwngr

Posted
Posted

Does yours also have a weird rattle or something on cold start for about 1 second? Mine does but only on cold start.

But I agree it takes longer for sure

Exhaust flapper?

Exhausted Enthusiast

Exhausted

Posted
Posted

Exhaust flapper?

Not that, I have an aftermarket catback exhaust.

I am thinking it might be the bendix gear on the starter retracting slowly???

bigsam94 Enthusiast

bigsam94

Posted
Posted

thank god somebody asked about this, i was wondering about it this morning when i started her up. DI has some weird side effects (the ticking still drives me nuts)

rm -rf Enthusiast

rm -rf

Posted
Posted

As JLR1164 says, it's because the the DI motor.

 

http://sandyblogs.com/techlink/?p=2971

 

 

Link has a crank time chart.

 

From the link:

 

 

Following are typical DI engine crank times using gasoline:

Screen-Shot-2014-02-20-at-11.22.51-AM.pn

If the temperature is below -22°F (-30°C), the recommendation is to perform an assisted start (such as with the use of a block heater).

 

Assisted start/block heater? I'm surprised. Those temps are common in the northern tier and Canada. I've not had to use a block heater at -20f in decades.

LaserBlueZ71 Enthusiast

LaserBlueZ71

Posted
Posted

DI engines take long to crank because the fuel pressure needs to build up.

 

On these new DI V8's, there is a fuel pump that sends fuel from the fuel tank, to a second fuel pump which is underneath your intake manifold. That pump has to pressurize fuel to 2,000 PSI before the engine will start. The colder it is, the longer it takes for the fuel to reach 2,000 PSI.

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