All I can say is ooops! I forgot to give all the problems! Besides not getting the Q-Jet howl, bog or surge at a full throttle stab .............. It seems like the car is starving for gas or air at high RPM. Yes I have a new filter, in fact a replacement for stock round K&N in the "Ram Air unit". And yes both the unit's doors are open wide to the hood. This even happens with no Air cleaner on the car. I do not have a tach on the car so I don't know what RPM I am at but with the car in drive if I hit the gas to the floor from a dead stop (lots of tire spinning) or rolling (5 MPH) the car seems to go flat just before it shifts into second gear? It just hangs there (saying give me more) until it shifts or I back off the gas a hair to let it shift. This is worse from first to second (about 35 Mph) but still noticable in the full throttle shift second to third (about 65-70 MPH). Last... The numbers on my carb tell me it is a Buick Q-Jet from 1970. My car is a 1969? I don't know but possible a late year 69 with a new number carb? Another possabilaty is the person we got the car from (Now dead) 20 years ago also had a 1970 Buick 225 that was wrecked. I am sure that car would of had a 350 or 455 in it. I have no way of knowing or asking anyone if this carb was put on from that car? If it was would it be the same setup ..... smaller jets maybe? any ideas? I hate to even talk about this as a problem because this car just runs excellent as a driver ........... But knowing its not "ALL Right" bugs the hell out of me! Ready for your 2 cents! Mark
That 70 Electra 225 came standard with a 455, and that is probably where the carb came from. You wouldn't have a 70 carb on even a late 69 car. If it is a 70 455 carb it should be 7040240. It will be jetted differently than a 350 carb; don't have my books in front of me. If no one else chimes in I can give you the rod/jet differences later.
Could be your fuel delivery {pressure} to the carb and not the carb itself. Used to run a 69 Road Runner at a 1000 foot track and it ran great. First time on a quarter mile it ran great for about 1100 feet and just laid down from lack of fuel. The fuel pump was getting farther behind the demands of the engine all the way down the track. Best thing is to get a fuel pressure gauge and see what is happening. Electric did the trick, doesn't take a super trick pump either, usually a street/strip car can get along fine on the cheaper Carter pump. Or if your pump is old a new one may be all you need. Dave B
How old is your stock fuel pump? If it is old throw it away and replace it with a Delco Stage-1 Bigger fuel pump don't even think of not doing this as all 455's that want full power should have this pump! Also you will have to replace the metal fuel line that goes from the pump to the carb with a repro stage-1 line. I have had this same problem with laying down and the fuel pump system was the cause. If it does not solve the problem you have at least eliminated one possible cause and it is not that expensive. Also another common problem is a clogged filter in the gas tank on the fuel suction pipe. Many people just cut these off and just change the filter in the carb more often. Hope this might help and save the price of an electric pump.
Dave--I presume that it is a 350, based on his screen name... Mark--As stated, there is no Stage 1 pump for a 350. There are aftermarket HP pumps, but a new stock pump will be all you need.
Well again thanks to all who chimed in. Yes it is a 350. The fuel pum is 7 years old and has 30,000 miles on it. And yes it appears the carb is from the 1970 225. In 1999 we put a brand new era corect long block in the car. At that time we also installed a clear inline gas filter also (it's getting gas). But then again I can not see in there at 75 MPH? This car has had this problem for as long as I can remember. It maybe the pump? But, if it is as "we" now think the q-Jet just bolted on from the 225? How would this be different in settings? Believe it or not I can count on ...... well maybe two hands the number of time I have stomped this car from a stand still to 3rd gear (drive). This car is truley a driver, a 20 footer! No dents, no rust and all stock! Everthing it came with is still there. I am putting a new vynil top on this month. Need new door panels because of speaker holes!!! End of year I wll get new bumpers mine are dinged. New paint will come when we hit the lottery! I can handle replacing the gas pump. As I said in another post Carm Faso is putting HEI under my cap this summer and was going to rebuild the carb. Would I be better off getting a new carb? Mark
No reason to. How does the car idle? Other than rods and jest, which are changeable, the only other difference in the 70 455 carb will be in the idle curcuit, being possibly a little richer. Other than to be numbers-matching, there is no reason not to run the 455 carb if it idles well
