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2013 Chevrolet Suburban
Platform: GMT 400, 800, 900

cold start issue and high idle

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Old Sep 25, 2009 | 7:55 PM
  #21  
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Sounds like your getting there.
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Old Sep 25, 2009 | 8:10 PM
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I hope so... I guess it makes sense, sorta, an over filled tranny would create "extra" drag on the motor since the tranny tq converter always turns and with the fluid being cold it would be thicker then when its warm so once hot it would create less drag... ok, now that i typed it out I really feel like I am reaching for an explaination...
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Old Sep 25, 2009 | 10:02 PM
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A over filled trans will not cause your problem.It was not super overfilled was it? Like many quarts? If it started right up then it had to be a coincidence. I think you need to look into the fuel pressure and how long it holds pressure after the engine is turned off.
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Old Sep 26, 2009 | 6:12 AM
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it was overfilled by 3/4 of a quart maybe more...

Last edited by atis; Sep 26, 2009 at 6:51 AM.
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Old Sep 26, 2009 | 6:50 AM
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just went out and started her.... 3 seconds and she was running. I dont understand the why but heck, I am not going to complain!! Will keep the thread updated if any changes.

Thanks for all the help!!
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Old Sep 26, 2009 | 7:39 AM
  #26  
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I hope after all of this, it is good. Good luck!
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Old Sep 26, 2009 | 10:47 AM
  #27  
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Sometimes we just dont question the powers that be ha ha ! matbe pounding your head on the radiator broke something loose ! LOL but i kinda think it might be as MB says a fuel related isssue and take a look at the fuel return check valve. it would explain the hard start issue and throw the dvm into a high air/fuel mode and raise the idle, also a stuck injector possibly hell but you should have some codes thrown i would think and looking back i rememberyou saying that you had to stand on the brakes at a stop light that makes me think a faulty tps worth a looksee and i know leave it be! to many components that have a direct influance to deal with without a scanner to test and moniter

Last edited by tm4hammer; Sep 26, 2009 at 11:17 AM.
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Old Sep 26, 2009 | 1:39 PM
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Update... the wife drove it all day, a half dozen trips and no issues at all... still no codes. I have a bday party for my daughter to day but will try and get the fuel pressure tester on her tomorrow just for GP.
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Old Oct 3, 2009 | 5:48 PM
  #29  
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update of the update....its baaaaaaaaaccckkk... (BLEEEEEEEEP)

Ok, she started acting stupid again today. So I got home and let her cool off. Put the fuel pressure tester on her and propped it up so I could read it under the hood from the driver seat. Turned the key to "on" without starting and watched the pressure jump to 60 psi and then nose dive faster then a heart attack to zero!! Cycled the key and it did it again.

So let me guess, Fuel pressure regulator and if I remeber correctly its UNDER the upper intake so I have a ton of work to get to her...any tips or tricks??
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Old Oct 3, 2009 | 8:15 PM
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Well you need to do a little more testing to prove that. You need to find a rubber portion of the return line. Turn the key on and quickly pinch the return line closed, now watch the pressure. If it holds the regulator is definitely bad and the pressure is leaking back down the line. If it still falls off you need to turn the key on again and very quickly pinch the pressure line closed. If the pressure holds then it is leaking back through the one way valve in the fuel pump. I do not think either of those are your problem but when testing always go in order and cross all the T and dot all I. Now with the return line pinched turn the key on and quickly pinch the pressure line if it still falls then your leak is under the plenum. Leaking injector/ injectors or the pressure regulator leaking from the vacuum port.
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