Have to prime truck before starting, help...
#1
02-12-07, 10:29 AM
Have to prime truck before starting, help...
I have a 87 Chevy 4X4 305ci full size blazer. About 4 months ago the only way I could get my blazer started was to prime the carb. I was told to put a new fuel regulator on the carb, did that, and the blazer started up everytime. Now 4 moths later I'm having the same problem, if I prime the motor by pouring gas in the carb, it'll start. Once I shut it off, I have to prime it again. Any ideas what it could be this time?
#2
02-12-07, 03:19 PM
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questions?
fuel pump electric or manual? carb or fuel injection? if a carb truck with manual fuel pump accelerator pump in carb would be a suspect
#4
02-13-07, 05:26 AM
I have a brand new electric fuel pump, just put it in, I can hear it running when I turn on the key. The truck has fuel injection, just put a new fuel regulator in the fuel injection carb. It doesn't have a carb, I can't remember what they call it.
#6
02-13-07, 07:22 AM
Air meter?
How is air metered for your injection?
Is it a mass air meter with the wire and no moving parts or the flap that opens and closes with change in volume?
In either case, I would carefully disassemble and clean and look for air leaks in the duct to throttle.
The old kind with the door may not open with only cranking vacuum when they get crudded-up but will open at idle, 400 v. 800 rpm.
Also the flap is connected to contacts that move along a variable resistor. Pull the cover off and look for worn spot at low rpms.
Is it a mass air meter with the wire and no moving parts or the flap that opens and closes with change in volume?
In either case, I would carefully disassemble and clean and look for air leaks in the duct to throttle.
The old kind with the door may not open with only cranking vacuum when they get crudded-up but will open at idle, 400 v. 800 rpm.
Also the flap is connected to contacts that move along a variable resistor. Pull the cover off and look for worn spot at low rpms.
#7
02-13-07, 04:00 PM
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Tbi
If what you have looks like a carb sitting on top of the engine it is a TBI (very common with GM of that year) there should be two injectors in there. get a noid light and see if they get power. The injectors pulse you might be able to feel or hear them.
There is a solienoid in each one that moves very fast.
There is a solienoid in each one that moves very fast.
Last edited by michael van; 02-13-07 at 04:01 PM. Reason: spelling
#8
02-13-07, 06:04 PM
As bejay said.......I'd check codes in the computer, but one step further...........Check state display and find out what the ECM is seeing as to engine temp BEFORE starting the engine............If the ECM sees "warm/hot" when the engine's cold, could be your reason for running lean on start up
#9
02-14-07, 09:14 PM
Yes, this motor does have a throttle body on it. I'll check out everything as soon as the outside temp goes up a little, the wind chills are still around -10.
