Check fuel pump
SOURCE: 1999 Yukon cold start problems.
1999 Yukon Start Issue - I have replaced the octopuse, battery, fuel filter, fuel pump, still having problems starting in cold weather, sometimes after a heavy rain.
Any suggestions?
Thanks
SOURCE: truck just shuts off
I own the same 3500 GMC 6.5 diesel truck with the same problem. We replaced the brain under the upper turbo hood and it fixed it pronto. No more shutoffs
SOURCE: 1987 Chevy Suburban 350 2wd not starting or running right
What size engine do you have in it? And, how many miles on it?? Well, I guess it really doesn't matter. At first thought it sounds like you are experienceing a fuel problem, and changing the throttlebody didn't solve your problem. I would start by looking and checking my fuel delivery system. The fact that you had to spray gas into the throttlebody tells me that fuel is not getting there. I would start with the least expensive thing to fix first. Check your gas filters. These are often , OFTEN, overlooked as a sorce of problems, and are rarely changed and often overlooked, and are the problem alot of the time. If that dosen't cure your problem check your fuel pump. Make sure it is delivering the proper pressure. I would bet your problem would be solved, but if it's not then next I would check the electrical components of your fuel system.
SOURCE: I have a GMC and I have replaced all the sensors
You may have a restriction in the exhaust, like a clogged catalytic. Converter. The mass air flow and the fuel pressure were good ideas too. lee
It sounds to me like you have a loose wire
somewhere. A loose wire explains why it sometimes works and sometimes
doesn't. It could easily come loose when hitting bumps and go back in
place when hitting bumps as well. Another thing a loose wire could do is
cause a short... It depends what the problem is exactly... Does it
work sometimes and not work sometimes as soon as the car is turned on?
Meaning, if it's not working when you start the truck, it won't the
entire ride. Or, is it working on and off throughout one full ride?
This should help more with determining what the problem is exactly.
If the light will come on and go off while you're driving, it's going to be a
loose wire. The wire could be bumped in and out of place while driving,
which is why it works and stops working while driving. It could also be a
worn wire that's being bumped together and apart, causing the same problem.
So check the wires going to the headlight set up.
If the light works sometimes when you start your truck and sometimes doesn't,
but doesn't change while driving, it could be a short. It could also be a
short if your light it working when you start driving, but eventually turns off
while driving, but never goes from OFF to ON. This is because if there's
a short, you would have to turn the truck off and then back on for the light to
possibly work again. With a short, the light will NOT come back on while
driving if it was not working when you started your truck. If it's a
short, you're going to have to figure out what's causing it. They have
tools you can buy for that. There are basic ones for roughly $25-$30, but
I believe those only test one wire at a time. While there are other ones
which can easily run $150 and more, and those test all the electrical at once
and tell you where the problem is.
Your best bet is to check the wiring involved with the head light set up.
If you notice any loose wires or old wires that are starting to corrode
or crack, replace them and that should do the trick! If you don't notice
anything, you could purchase one of those tools and test for a short. Or,
what I recommend instead of buying the tool is take your truck to your local
auto parts store (AutoZone, Pep Boys, Etc) and tell them what's going on, and
ask them if they could test the truck for a short. Then, if you don't
want them to fix it, just tell them you needed a quote and you'll come back
when you have money... and then just do it yourself. Or, you could have
them do it if that's what you prefer...
Good Luck and I hope I helped!!
Brendon
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