i have a 350 chevy that has a miss when it's cold, but goes away when it gets warm ?? did the compresson test, all ok, leak down test no leaking valves,new tune up & wires, what's left to be wrong ? somebody gotta know , so lets have it, tell what my problem is , i can take it !!!
Fuel leaking down into the cylinders overnight. Which in turn fouls out a spark plug. Will miss when it's cold until the plugs build heat and burn off the excess fuel. Seen it happen with Quadrajet carbs.
"hey" where are all the small block chevy guys,???somebody has to have an idea as to what is happening to my engine ? somebody has to have seen this movie before ? so give me some info ,,, man
Is it one cylinder or random missfire when its cold ? Cold = damp too in most cases, id check your ignition system first. Maybe a bit rich/lean when on the choke. If you suspect fuel loading up while it sits, that should be easy enough to find excess fuel in the intake tract on a cold engine.
Is it one cylinder or random missfire when its cold ? Cold = damp too in most cases, id check your ignition system first. Maybe a bit rich/lean when on the choke. If you suspect fuel loading up while it sits, that should be easy enough to find excess fuel in the intake tract on a cold engine.
Ever get up in the morning and ya walk a little wobblie? Same thing! lol. Just sounds like some clearances are a little loose & everything tightens up when warm. can also be something to do with resistor plugs & wires JimV
Had the same problem on my 327, after a lot of head scratching,trying this and that, new plug wires solved it.
As the replies show, it could be a myriad of things. To add another possibility, on one of my 350's, it often got condensation inside the distributor cap in the AM. Apparently a common problem, some people used to enclose the cap in a plastic baggie to mitigate the problem.
You've already gotten enough ideas to keep you busy for awhile. There is no 'Silver Bullet' in your case. So, get to work and don't be so demanding.
Choke not functioning properly? - either not at all or opening up too early? If automatic, could be anything, if manual, operator error? I think these kind of problems aren't the preserve of Chevys only! Chris
Check for a sloppy bushing on the bottom of the distributer shaft. Sloppy when cold then everything swells when it warms up. Eventually it will eat a distributer gear, it will be 15 degrees out and if you are lucky your wife will back up though rush hour traffic to give you a tow to the house.
Are you loosing any coolant lately? It sounds like coolant getting in a cylinder to me. I hope not but the symptoms look that way. If it is a fresh build you may only need to torque the heads again . Do you see any white smoke out the tail pipe on startup? You could find a radiator presure pump and preasurize the coolant system after a good warm up, pull the plugs and then crank the engine over after a few hours. I usually put a piece of cardboard in front of the spark plug holes and look for coolant after cranking.
my 55 chevy was doing the same thing ... Put new plugs in and that fixed it ... The gas were getting now is causing problems like that ...
Yeah, 20 guys jumped in and gave you some solid suggestions, what more can you expect from an internet diagnosis ? And they didn't even charge you $ 95 per hour ! Don
I have read and reread the thread and I have finally figured out what you problem is. I know you can probably take it, but if I tell you what your problem is someone will be offended, if you catch my drift.
Thank the gods of all things mechanical that I am exempt from seeking help from such a diverse wealth of cosmic intellect.
The Jalopy Journal
