jay317
indianapolis
Full Member
Joined: 04/09/2011
View Profile
 Offline
|
I have a Chevy 454 carb motor that's hard to start in the morning but when it starts it runs perfect, it has a electric fuel pump switch that I have to turn on before I start it my question is how long do I let the pump run before I start it??? Or could the be something going on...The motor only has 61,000 miles! Thanks
|
Executive
California/Arizona/South Dakota
Senior Member
Joined: 02/07/2008
View Profile
Offline
|
I'm hard to start in the morning too, until I have my cup of coffee.... ....
My guess would be a weak spring in the automatic choke. You might get by with a simple adjustment...loosen the three screws on the side and move it up a notch or two. If that doesn't help, you probably should rebuild the carb.....Dennis
Dennis and Debi
Monaco Executive M-45PBQ Quad Slide
525HP Cummins ISM 6 Spd Allison
Chevy HHR W/ ReadyBrute
Fourth Year Full Timing Click here to view our travel blog
|
weasel4
Alberta
Senior Member
Joined: 07/06/2003
View Profile
Offline
|
jay317
On a carbed engine, you have to kick the accelerator pedal once or twice, to engage the automatic choke butterfly and the high speed idle cam.
BTC
|
barlow46
Edgewater, FL
Senior Member
Joined: 12/13/2004
View Profile
Good Sam RV Club Member
Offline
|
Is your mechanical lift pump blocked off with a face plate? When you switch on your electric pump, have you looked around for any pressure leaks? I am assuming the original equipment lift pump was replaced with an aftermarket frame mount electric pump. If not then pay no attention to my post. If it has been done this way, check the face place area for a leak down of fuel.
2005 Monaco Dynasty Diamond IV 42'
04 F450, 6.0 auto, 4:30 rear; BrakeSmart; 50 gal aux.tank, 01 HR Presidential 35CKS, 3 slides, axles flipped; TrailAir Pinbox. pin weight 2760. Total gross TV and 5th: 24,060 lbs.
|
jay317
indianapolis
Full Member
Joined: 04/09/2011
View Profile
Offline
|
Just went out I noticed that the choke doesn't close when I pump the pedal
|
|
|
the_armadillo
SE Texas
Senior Member
Joined: 08/29/2011
View Profile
Good Sam RV Club Member
Offline
|
Depending on ambient temperature it may not close on a cold engine even when properly adjusted. If I recall correctly, a properly adjusted rochester choke plate should just about close at 70 degrees F. So at summertime temps, it may not close very much. On one of my rochester equipped trucks that is very hard to cold start, the fuel bowl is emptying out when it sits. I have not traced it yet to the fuel pump or leaking bowl plugs. I suspect the later. On the cold engine, can you see raw fuel being pumped into the carb when looking down the horn if you pump the accelerator prior to trying to start? If not I suspect the bowl is draining down.
|
weasel4
Alberta
Senior Member
Joined: 07/06/2003
View Profile
Offline
|
the_armadillo
Yo there is a fix for the Rochester 4bbl leaking down. The plugs under the main well jet don't seat properly and fuel leaks by. I just smeared some epoxy in the area around the plugs and it stopped the leaking.
BTC
|
Executive
California/Arizona/South Dakota
Senior Member
Joined: 02/07/2008
View Profile
Offline
|
jay317 wrote:Just went out I noticed that the choke doesn't close when I pump the pedal
Viola!!!..choke plate doesn't close...engine won't run right til it's warm...fix the choke and your problems disappear.fortunately an easy and inexpensive fix......Dennis
|
Diplomat Don
Moorpark, Ca
Senior Member
Joined: 04/09/2005
View Profile
Good Sam RV Club Member
Offline
|
jay317.....With the engine cold in the morning, remove the air cleaner and housing. Open the throttle wide open and keep it open. With the throttle open, adjust the choke until it's closed. There is also a fast idle screw that usally won't need adjustment, but make sure the stepped cam on the linkage moves and the fast idle screw is on the cam step This raises the idle speed while choked. Now release the throttle and open one more time. This should give you the correct setup for a cold start.
The procedure on your Chevrolet is to step on the gas pedal twice to set the choke and fast idle cam and to add enough fuel into the engine for the start. Once the engine starts, let it run until it's warm. Press the pedal one more time to release the choke and the fast idle screw from the cam.
Don & Mary 
2005 Monaco Diplomat 36SKT
400 Cummins
2012 Chevrolet Silverado LTZ CrewCab 4WD
2013 Polaris RZR 800 LE
|
