500, 472, 425, 368 Discussion, Any advice on this? in Cadillac Engine Technical Discussion; I just purchased my first caddy....a 1979 sedan deville, with a 425 4 barrel carb.
90k miles on it,,,pretty clean ...
I just purchased my first caddy....a 1979 sedan deville, with a 425 4 barrel carb.
90k miles on it,,,pretty clean car...
It is running rough, and missing. It seems to be lacking power.
If I have the car in park or neutral, it will rev up just fine, nice and smooth.
When I put it in gear, it seems to be running rough when I hit the gas, like a miss and sputters up the road.. And lack of power.
I can't make sense of it. I checked, and someone before me has put in new plugs, they look clean,. and also the wires seem fine. Gas filter is new, cap and rotor are new,..
I just repleced the ignition module, from messing around, and pulling wires while it was running, the module blew out. I repleced it, and of course, it fired right back up, and still the sam,e problem though.
Has anyone run into this, or have advise. Thanks so much in advance, looking forward to driving this caddy, and having a new home here on this forum,,,,Tony
Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
Re: Any advice on this?
Run a compression test to rule out internal engine problems. Ideally this car should be hooked up to a scope to see the firing line to rule out secondary ignition problems. If both tests are within spec then I would look for a vacuuum leak.
Automobile(s): '78 Superior Cadillac Amublance, '69 Miller Meteor Ambulance
Re: Any advice on this?
Originally Posted by 79caddy1
.......... Is it possible to get a new bad plug or wire?
Defective new parts are always a possibility. Check the vacuum release on the emergency brake. Seems that it is a common source of problems. Considering the age of the car, there is a possibility that any of the vacuum hoses could be cracked and in need of replacement. Also check the brake booster hose where it enters at the back of the carburetor. This is another common problem area. Junk....
Thanks....I checked for leaks this morning, and found nothing. Actually, it looks like somone replaced all the lines. The motor is really clean, but still missing and rough, when trying to drive it. I cannot believe how smooth it is and revs up, when out of gear.