Hello! I’m new here and a new owner of Buick. I went a couple of days ago to have a double exhaust system in my car. The first morning (pipe after installation,before that everything was ok) the problems started... the car didn't start (didn't even try).The start runs nicely but no. When give the start fog then it starts running.When the engine is warm, it starts nicely running. Again next morning (when engine it`s cold) not starting...After starter fog starting. So the problem started immediately after the exhaust, before that there were no problems starting up etc. I'm not a mechanic, but my own idea is that the fault is now somehow exhaust manifold (I'm not sure what the real name is, I guess that intake heater?) On the co-driver side. Would somehow be stuck now etc? Could anyone help with this? I would be grateful for any tips! (sorry my english, hope you understand).
Verify that the fuel pump is working and that the rubber hoses between the tank and hard lines are intact.
even if your heat riser was stuck open it still should start but run rough till warmed up. am thinking your not getting fuel, your carb is draining down or your accelerator pump is not working, i might be wrong. the guys on the forum will help you out.
I think Briz may be on to something. They had to run your new pipes close to the rubber lines near the fuel tank. Might have disturbed them.
Check the choke's heat riser valve at the bottom of the exhaust manifold. It may be stuck open or removed entirely when they installed the exhaust. Mine was stuck about half open and I cut out the butterfly plate when I had dual exhaust installed...but I have a carb with electric choke.
I saw under the car when they made the pipes,did not touch the fuel hoses and the pipes did not go very close to the pipes.The throttles are closed when cold, ie the choke should also work and the petrol enters the carburettor / the petrol pump works.Myself I suspect that weird heater in the exhaust manifold (like 64 wildcat conv say).I just don't understand how it works / it should work and how can it be tested if there is a fault in it?
No, even if the manifold heat system was not working the car would still try to start if it had gas. Seems like the gas might be leaking out of the Carb, or maybe even the pipe from the carb to the pump. Try pumping the pedal a couple of times and then pushing it once to the floor (to set the choke), and see if that helps any? If there's gas sitting in the carb, it might help.
The heat riser has a spring and a bob weight on the outside of the pipe, with a plate inside that is open or closed by the spring reacting to hot/cold condition as the manifold is heated by exhaust. Closed when cold, and be open when engine is warm. You should be able to rotate the external weight and it move freely when cold, and it should return by spring tension when cold when you let go of it after turning it.
the easy thing to do in the morning, look down the carb holding the carb choke open and open the throttle 2-3 times while looking down the carb to see if it is squirting gas.
Well,the fault survived. The gas pump when cold,did not push gasoline into the carburetor at all.I changed the gas pump and now it works just fine also in the cold. Pretty tense thing just that happened right after the exhaust replacement. Thanks for all the helpful tips!
I had an exhaust installed on a 68 and it broke a piston as I left the shop. Thought it was weird how much smoke that new pipe was making
a high percentage of the time when a carbureated car is hard to start the problem is accellerator pump failure, or near failure.... that is the first thing I would check out....
