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hard starting when motor gets warmed up |
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its RJ
AMC Apprentice Joined: Jul/16/2012 Location: berwick,pa Status: Offline Points: 69 |
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Posted: Jul/30/2018 at 12:55pm |
hi .. have a 1969 rambler with a 199 6 cylinder with a carter rbs 1 barrel carb .. put a 1/2 spacer between carb and manifold to keep heat away from carb .. didn't help .. figure gas is getting warm and causing hard warm engine starts .. any ideas ..thanks
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1969 220 2 door post
1976 hornet hatch - 5speed |
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FSJunkie
AMC Addicted Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4741 |
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We have to establish what "hard" is. When you go to start the engine hot, first push the throttle half open before you crank the starter and hold the throttle there as you crank. Release the throttle after it starts. They should start in 5 seconds, maybe a little longer if it's a really hot day. That is normal for just about all carbureted engines and that is the normal starting procedure for them. If it's taking much longer than that, we can say it is starting "hard".
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1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
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vinny
Supporter of TheAMCForum Joined: Jan/05/2012 Location: Calgary Status: Offline Points: 2837 |
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Same symptoms here with a 232 2 barrel WCD carb. It does start a lot better after it has cooled down.
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tomj
AMC Addicted Joined: Jan/27/2010 Location: earth Status: Offline Points: 7522 |
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i disagree on that being "normal for a carbureted car". each fall i set the choke one not richer, then leaner in spring. one press of the pedal to set the choke/fast idle, crank, starts in one second. i don't get a lot of cold here, but a lot of hot. no difference in 110F weather. hot starting shoudl be BETTER than cold start. lubricants are closer to operating viscosity, gas puddles less, etc. spark is spark. less than that and something is wrong. my partners' 72 258ci hornet with YF, which gets at best an annual tuneup and no more, is the same. ditto all my carb cars back 20 years. my 63 american did have a "vapor lock" type problem, if it was parked after a very long desert/highway run. it would start fine, but "run dry" about 20 seconds later, for about 5 seconds. scare the crap out of me after pulling back into the road. solved it by replacing steel line under the hood with rubber (heat soak). |
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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FSJunkie
AMC Addicted Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4741 |
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Allow me to be more specific. In my experience on quite a few carbureted cars... Most will hot start with just a quick flick of the key if they are started within a few minutes of being shut off. Yes. However, if they sit for more than a few minutes after being shut off hot they will take excessive cranking to restart unless the throttle is held partially open while cranking. Doing so will make them start in less than five seconds in most cases. Sometimes sooner, sometimes later. It's caused by heat soak vaporizing the fuel in the carb itself. The vapor partially floods the engine. A few seconds of cranking with the throttle open a little clears out the excess vapor so the engine can start faster than with the throttle closed. These are engines that have nothing wrong with them other than being restored to stock. It's just how a lot of them are. Many owner's manuals actually say to hold the throttle partially open for hot starts too. I do it so much that it's an ingrained habit. I sometimes mistakenly hold the throttle partially open on an EFI car when I hot start it because I drive carburetors most of the time.
Edited by FSJunkie - Jul/31/2018 at 4:27am |
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1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
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its RJ
AMC Apprentice Joined: Jul/16/2012 Location: berwick,pa Status: Offline Points: 69 |
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thank you for your info and help .. bob
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1969 220 2 door post
1976 hornet hatch - 5speed |
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6756 |
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Other then the above mentioned fuel and carb, heat:
- can make a weak battery or alternator provide less current, what's the voltage cold, running, hot - can increase resistance in the starting motor, might want to have it checked if nothing else solves your problems.
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Thikstik
AMC Addicted Joined: Mar/20/2008 Location: Alabama Status: Offline Points: 1327 |
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I doubt this is happening to you, but when i used the Holley spacer gasket (1/4 thick) on my 390 cfm, i would get some very rich hot soak starts. So, perhaps its those gaskets. i reckon they seal better when hot soaked due to expansion, thereby richening mixture too much at times. Then when cooler, they settle to where carb was set. So ironically, a leaking base gasket/s can set this scenario up causing an overly rich mix.
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75 gremlin x, jeep 4.0 headed 258,
264H Cliff cam, intake,header. 390 holley. I want a 282 VAM motor! AC/PS/PDB. 72 AMX , 304 2bbl, 3speed, now disks...probably will sell, want an automatic /AC. |
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Thikstik
AMC Addicted Joined: Mar/20/2008 Location: Alabama Status: Offline Points: 1327 |
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tomj, You made the hotrod Power tour I do believe?!!
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75 gremlin x, jeep 4.0 headed 258,
264H Cliff cam, intake,header. 390 holley. I want a 282 VAM motor! AC/PS/PDB. 72 AMX , 304 2bbl, 3speed, now disks...probably will sell, want an automatic /AC. |
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tomj
AMC Addicted Joined: Jan/27/2010 Location: earth Status: Offline Points: 7522 |
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yup. 6500 miles. drove it hard-ish, 65 - 70 mph (195.6 OHV, remember!), changed jets New Mexico to Oklahoma (continental divide and mountains, 4000 ft and over), three quarts of oil (a quart every 2000). changed when i got home. |
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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