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View Poll Results: how long does your engine turn over before first cylinder ignition?
1 second 5 18.52%
2 seconds 11 40.74%
3 seconds 6 22.22%
4+ seconds 5 18.52%
Voters: 27. You may not vote on this poll

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Old 07-22-2013, 10:53 PM   #1
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how long does your engine turn over before first cylinder fires?

My jeep takes about a solid 4 or 5 seconds to turn over and ignition in the first cylinder from a cold start. If the engine is warm then it takes about 1 or 2 seconds.

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Old 07-22-2013, 11:08 PM   #2
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About the same on my '95.

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Old 07-23-2013, 12:19 AM   #3
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2 seconds from a cold start. 3-4 after the engine is warmed up.
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Old 07-24-2013, 08:25 AM   #4
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should I be worried about such a long turn over time to get ignition?
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Old 07-24-2013, 08:46 AM   #5
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what motor do you have? stock? if its a 4.0 or 2.5 wait a few seconds after turning the key to let the fuel pump build pressure
if its a 4.2 I wouldn't worry about it, when I had a weber carb if it sat for more than a day it took forever to start. the holley I have now starts within 2 turns.
I have read that on the 4.2 the return line on the fuel filter should be on top so the filter doesn't drain.
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Old 07-24-2013, 10:04 AM   #6
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X2

On filter
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Old 07-24-2013, 10:31 AM   #7
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I have a 2.5 and it takes a bit after its warmed up. Possibly change the plugs if you haven't in a while.
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Old 07-24-2013, 10:54 AM   #8
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I have a 2.5. Every cold start takes 2 seconds, after that it's about 1-2 seconds. I never have to turn it over multi times unless I changed the fuel filter. I will pump it about 3 times on cold starts but it works like a charm.
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Old 07-24-2013, 10:59 AM   #9
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Quote:
Originally Posted by roadyrob View Post
what motor do you have? stock? if its a 4.0 or 2.5 wait a few seconds after turning the key to let the fuel pump build pressure
if its a 4.2 I wouldn't worry about it, when I had a weber carb if it sat for more than a day it took forever to start. the holley I have now starts within 2 turns.
I have read that on the 4.2 the return line on the fuel filter should be on top so the filter doesn't drain.
I'll give that a shot. My 4.2 takes about 10 seconds to start.
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Old 07-24-2013, 11:03 AM   #10
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Excessive crank times can be low compression, or more commonly the fuel pump is losing pressure when off and draining back to the tank slightly. My 2.5 does about 1.5-2 seconds every time, maybe up to 2.5 seconds in the winter on a cold day. Another common thing for computer controlled cars is that the computer has to wait for the engine to make enough of a revolution to get the cam and crank sensor locations. Older carbed cars with regular distributors could pretty much fire as soon as the key was hit if the gas was pumped a couple times as it did not need to wait for those sensors to pick up location.
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Old 07-24-2013, 11:09 AM   #11
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IF I let my 4.2 sit for a day it wont start for about a minute or two. but when its warmed up on the first crank.
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Old 07-24-2013, 10:35 PM   #12
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Sorry I should have said my motor.... 95 YJ with the 4 banger
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Old 07-24-2013, 10:45 PM   #13
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My 4.2 takes a few seconds on cold start I have to hit the gas a few times before starting but after its warmed up it doesn't have a problem but there have been a few times that It won't turn over or it will backfire but most times it does start right up
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Old 07-24-2013, 11:24 PM   #14
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mine 4.2 L even cold starts instant I turn the key, thats the advantage of having HEI and a correct setting of the choke also warm starts right away

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