What would cause loud engine knocking for a few minutes only when the engine is cold?
[Edit]

Answer

Is there any smoke when you first start it? what is happening is the valve seals are probably worn and letting the oil seep past them. when your engine is first started it has no oil or very little oil at the top of the engine, thus causing the knocking noise. could be more but this is a most likely answer. oh and is you haven't changed your oil every 3,000 miles you had beeter start doing it....

answer knocking sounds usually come from bottom of engine try a better quality and correct viscosity oil

does it stop after warming up? could be faulity engine lifters. lpaws45.

Improve Answer Discuss the question "What would cause loud engine knocking for a few minutes only when the engine is cold?" Watch Question

First answer by Chevy72402. Last edit by Frmtrkr. Contributor trust: 692 [recommend contributor]. Question popularity: 81 [recommend question]

Research your answer:

Answers.com > Wiki Answers > Categories > Cars and Vehicles > Parts and Repairs > What would cause loud engine knocking for a few minutes only when the engine is cold?

Our contributors said this page should be displayed for the questions below. (Where do these come from)
If any of these are not a genuine rephrasing of the question, please help out and edit these alternates.
Loud engine when car is cold?  Your 1987 grand am engine is knocking?  Engine knocking in cold weather at startup?  Engine makes a knocking noice on cold starts?  What causes knocking and pinging when the engine is cold?  If your engine is knocking how long do you have before it dies?  What would cause loud engine knocking for a few minutes only when the engine is c?