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I've got an 2014 C7 that I bought new last February. I've inquired several times from various sources about this car and the way it starts. I believe, in comparing to my cars of old, it starts like ****! It turns over several times before firing up, especially when its cold. My last car was an 07 Z-06... Started like a Chevrolet, turn the key, or push the button as it were... car starts immediately.
My wife just picked up a new 2015 Acura TLX with a 3.5L 290HP V-6. The new car also has direct injection just like the C7's. Difference being, her car starts before you even let off the start button. Literally it starts very quickly unlike my car that spins several rounds before it fires. Anyone care to offer an opinion of facts as to why these cars vary in starting so differently, bring they're both direct injected?
Can't speak to what Acura does (possibly primes the fuel system at some point between pushing "Unlock" and opening the door/sitting in the driver seat) but the Chevys prime the high pressure DI fuel pump with the ignition button. Is it a big deal for you?
I know my Daily Driver (2007 Acura TL Type S) has electronic ignition. So when you turn the key, the car automatically starts up. The Stingray doesn't do the same thing (for some reason).
I don't think it's a problem, just different ignitions.
Can't speak to what Acura does (possibly primes the fuel system at some point between pushing "Unlock" and opening the door/sitting in the driver seat) but the Chevys prime the high pressure DI fuel pump with the ignition button. Is it a big deal for you?
Hey Higgs, thanks for the response. I know it seems trivial, but it does seem to be getting worse as the season gets colder. I'm not sure it's a problem necessarily, just a minor concern I have regarding the car. If they all do it, I guess it's a me thing. Again, I appreciate your response.
I know my Daily Driver (2007 Acura TL Type S) has electronic ignition. So when you turn the key, the car automatically starts up. The Stingray doesn't do the same thing (for some reason).
I don't think it's a problem, just different ignitions.
Steven, you and I had this conversation in the past. I know you know what I'm talking about. Your Acura and my wife's last TL were roughly the same car. They start fast unlike my C7. My only concern was based on her new DI car starting very quickly as opposed to my car. Wanted to inquire once more to the forum about this lil issue. Thanks for your reply.
Hey Higgs, thanks for the response. I know it seems trivial, but it does seem to be getting worse as the season gets colder. I'm not sure it's a problem necessarily, just a minor concern I have regarding the car. If they all do it, I guess it's a me thing. Again, I appreciate your response.
There is a table in the tune that increases cranking time as ambient temps decrease. It's all on purpose.
Now if it sounds like it is slow cranking, like a weak battery, that's different.
There is a table in the tune that increases cranking time as ambient temps decrease. It's all on purpose.
Now if it sounds like it is slow cranking, like a weak battery, that's different.
Really?!?!? That's very interesting. Could you please elaborate as to the reason for this? It actually spins over very quickly, so I'm sure it's normal Definitely not a weak ignition or battery, because it comes to life strong, just spins several rounds before it fires as I had stated earlier.
Really?!?!? That's very interesting. Could you please elaborate as to the reason for this? It actually spins over very quickly, so I'm sure it's normal Definitely not a weak ignition or battery, because it comes to life strong, just spins several rounds before it fires as I had stated earlier.
the high pressure fuel pump is driven off a camshaft lobe (not the same ones that open valves) so it takes some engine rotations to get it pumping. i can post a screenshot of the table when i get home from work if someone doesn't beat me to it.
the high pressure fuel pump is driven off a camshaft lobe (not the same ones that open valves) so it takes some engine rotations to get it pumping. i can post a screenshot of the table when i get home from work if someone doesn't beat me to it.
That would be great, I appreciate it. I'm trying to learn a little about these new engines, because they're a lot different animals than the ones I grew up messing around with.
You know,according to the owners manual, that you don't hold the button in until it starts. You push and release.
That's exactly what I do. Thank you for the response. I just push the start button then release it and wait for it to fire... Still waiting... Kidding. :-)
11.5 CR is probably significantly higher than the Acura. As a result the cranking speed is probably a tad lower. Gm 4 cylinders crank faster than the 8 cylinders due to pumping and frictional losses on cold start.
The high pressure fuel pump is at the rear of the engine and the way the fuel lines are routed you want a short cranking time to get consistent fuel pressure present at each injector for a nice consistent fire up.
11.5 CR is probably significantly higher than the Acura. As a result the cranking speed is probably a tad lower. Gm 4 cylinders crank faster than the 8 cylinders due to pumping and frictional losses on cold start.
The high pressure fuel pump is at the rear of the engine and the way the fuel lines are routed you want a short cranking time to get consistent fuel pressure present at each injector for a nice consistent fire up.
Hi there, I appreciate your reply, however, I think I'm not conveying my point of the original statement. My car spins over very quickly, and it starts every time... It just doesn't start as quickly as my old cars did, and certainly not as quickly as my wife's new Acura with DI does. My only issue or concern was a cold motor spinning over with basically zero oil pressure could it have long term effects on the motor? I would say 3-5 seconds at times it takes it to start and to me that seems waaaaaay too long. My wife's car literally starts as soon as the button is pushed, meaning real time..., right now! My car, not so much.
Hi there, I appreciate your reply, however, I think I'm not conveying my point of the original statement. My car spins over very quickly, and it starts every time... It just doesn't start as quickly as my old cars did, and certainly not as quickly as my wife's new Acura with DI does. My only issue or concern was a cold motor spinning over with basically zero oil pressure could it have long term effects on the motor? I would say 3-5 seconds at times it takes it to start and to me that seems waaaaaay too long. My wife's car literally starts as soon as the button is pushed, meaning real time..., right now! My car, not so much.
3-5 seconds does seem too long....have it checked at a dealer for free.
3-5 seconds does seem too long....have it checked at a dealer for free.
Funny you should mention that... I did, they said it's totally normal. New direct injection. That's why I thought I'd ask on here to see just how "normal" it really is? I had posted a similar question several months ago but didn't have another DI car to compare it to until my wife just got her new car. Anyway, I appreciate your advise and explanation as to why this is or isn't normal.
Funny you should mention that... I did, they said it's totally normal. New direct injection. That's why I thought I'd ask on here to see just how "normal" it really is? I had posted a similar question several months ago but didn't have another DI car to compare it to until my wife just got her new car. Anyway, I appreciate your advise and explanation as to why this is or isn't normal.
well extended crank is normal. 5 seconds seems excessive.
Ed
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Extended Cold Crank with Direct Injected Engines
February 20, 2014
The 4.3L, 5.3L, and 6.2L (RPOs LV3, L83, L86 and LT1) direct injected (DI) engines available on some 2014-2015 Corvette, Silverado 1500, Suburban, Tahoe, Sierra 1500 and Yukon models may have an extended or long crank time during cold ambient air temperatures.
Direct Injection engines may have slightly longer cold crank times than that of port fuel injected engines. Direct Injection systems run at higher pressures and the mechanical pump on the engine must build up the required pressure before the first injection event occurs.
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).
For ethanol fuel, see #PIP5174: Extended Engine Crank Times When Using E85
Following are typical DI engine crank times using gasoline:
Last edited by Old Yellow; Nov 27, 2014 at 12:11 AM.
Direct Injection
