1970 Buick Riviera little/no acceleration, engine very roug

1970 BUICK RIVIERA
200,000 MILES • 6 CYL • FWD • AUTOMATIC
Avatar
LAULEE77
  • MEMBER
  • 1 POST
My buick riviera quit running about a week ago. We replaced fuel pump, and it ran fine. Now, a week later, it's doing the same thing. Engine runs very rough, when you step on gas it barely accelerates, then dies out. It will restart, and sometimes, after about 30 mins, it will appear fine. We were told that the fuel filter was NOT changed at time new pump was changed. We did change filter, but hasn't helped. In morning, it will drive fine, and once it heats up, it begins to bog, then you can't go over 5 miles per hour.
Any suggestions would really help out!!
Oct 18, 2009 at 2:02 PM
Advertisement
Avatar
JDL
  • CERTIFIED EXPERT
  • 16,098 POSTS
welcome to the forum, how long since a tune-up? Do you have spark at all the plugs, when it acts-up? An easy way to tell, is to use a digital voltmeter as a quick first test, not conclusive, but, you don't unplug anything. One meter lead you ground, the other you touch to plug wires one at a time, engine running. It's an inductive reading, you don't penetrate the plug insulation, you don't take plug wire loose. The meter may only show 1/2 volt, the reading can differ from one make and model to another, I just look for the reading to be close to the same for each plug wire.

I'd probably make double sure about fuel pressure/ volumn. With some carbs, you can remove the air-horn without removing the carb, if possible remove the air-horn see if there is any fuel in the float-bowl, when the problem occurs.Thanks for the donation.
Oct 19, 2009 at 1:10 PM