Why does my 1964 Cadillac start right up cold but after warm it starts hard

Asked by Aug 30, 2012 at 01:15 AM about the Cadillac DeVille

Question type: Maintenance & Repair

Just rebuilt. Old engine started up warm right away

1 Answer

13,365

Explain a little more what you mean by starting hard. Does it start and run rough when it finally does start? Does it start up running smooth right away? Does it vary from one time to next? Does it ever backfire? Also you should run a vacuum check on it. This can tell you much about the engine. Here is a little diagnostic reference for vacuum on an engine.............................................. ......... You should get between 17-22 in. hg. depending on your elevation above 2000 feet MSL or mean sea level. To perform this test hook vacuum gauge directly to manifold vacuum. 1. Low steady needle usually indicates leaky intake, a leaky vacuum hose, late timing, or incorrect camshaft timing. 2. If reading is 3-8 inches low and fluctuates at that low reading suspect an intake manifold gasket leak at intake port or faulty injector. 3. If the needle has regular drops of about 2-4 in hg. at a steady rate the valves are probably leaking. (Perform a compression check). 4. An irregular drop or down flick of the needle can be caused by a sticking valve or an ignition misfire. 5. A rapid vibration of about four in hg. indicates worn valve guides. 6. Slight fluctuation of one inch or so indicates ignition problems. 7. Large fluctuation perform a compression check. 8. If needle moves slowly through a wide range check for PCV issues. Hope this gives you a good place to start and helps you figure it out.

Your Answer

Cadillac DeVille Experts

  • #1
    kikero
    Reputation
    2,250
  • #2
    Js08016
    Reputation
    1,960
  • #3
    Cynthiasmith
    Reputation
    1,740
View All

Related Models For Sale

Used Cadillac DTS
48 Great Deals out of 1,505 listings starting at $2,975
Used Cadillac CTS
237 Great Deals out of 10,362 listings starting at $2,950
Used Lincoln Town Car
35 Great Deals out of 1,737 listings starting at $1,099
Used Chevrolet Impala
572 Great Deals out of 34,336 listings starting at $890
Used Cadillac Escalade
252 Great Deals out of 11,884 listings starting at $1,200
Used Cadillac STS
25 Great Deals out of 931 listings starting at $2,490
Used Chrysler 300
324 Great Deals out of 19,325 listings starting at $900
Used Mercedes-Benz S-Class
154 Great Deals out of 8,154 listings starting at $1,200
Used Lincoln Continental
16 Great Deals out of 3,403 listings starting at $32,794
Used Chevrolet Tahoe
786 Great Deals out of 41,559 listings starting at $1,987
Used Dodge Charger
448 Great Deals out of 32,879 listings starting at $1,999

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.