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Old 09-13-2011, 01:21 AM   #1 (permalink)
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Default why does my car start rough after sitting for a few days?

i parked my car at home for a few days and when i went to start it cranked over rough and idled bad for a few seconds then it was normal.

what can be the problem?
can it be leaky injectors , bad o-rings?
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Old 09-13-2011, 12:11 PM   #2 (permalink)
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I got this one!
problem- car sitting and then starts rough sometimes almost wanting to die.
reason - oil draining down to the oil pan and or not thick enough to stay in the engine while off
solution - never run anything lower than 5w30 non synthetic or 10w30 synthetic.
2) if you dont drive for a few days or longer its ALWAYS a good idea to pull the ECU fuse from under the hood, crank it for about 20 sec. (you will hear the compression go back up) replace fuse and start.
3)of course make sure your oil is never to low

I am running royal purple 5w30 bc it was almost winter and I thought i was going to drive it during winter. However synthetic is thinner and 5w is thinner than 10w so trust me when I say 5w synthetic is WAY to thin to run. I will be switching back to 10w in about 1k miles. Running thicker oil will quite your engine noise down a little as well ie. ticking or other head noises.
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Old 09-13-2011, 01:36 PM   #3 (permalink)
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Why would oil grade have anything to do with a rough start?
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Old 09-13-2011, 01:53 PM   #4 (permalink)
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Quote:
Originally Posted by camc3r View Post
I got this one!
problem- car sitting and then starts rough sometimes almost wanting to die.
reason - oil draining down to the oil pan and or not thick enough to stay in the engine while off
solution - never run anything lower than 5w30 non synthetic or 10w30 synthetic.
2) if you dont drive for a few days or longer its ALWAYS a good idea to pull the ECU fuse from under the hood, crank it for about 20 sec. (you will hear the compression go back up) replace fuse and start.
3)of course make sure your oil is never to low

I am running royal purple 5w30 bc it was almost winter and I thought i was going to drive it during winter. However synthetic is thinner and 5w is thinner than 10w so trust me when I say 5w synthetic is WAY to thin to run. I will be switching back to 10w in about 1k miles. Running thicker oil will quite your engine noise down a little as well ie. ticking or other head noises.
I don't think this is 100% correct. From my understanding most engine damage occurs during startup. During this time the parts aren't fully lubed since the oil pump hasn't pumped any oil yet. I would think it would take the thick oil longer to reach the point where its needed. Synthetic is definitely the way to go.

What oil is the OP is running?
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Old 09-13-2011, 03:19 PM   #5 (permalink)
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Why would you want to pass bad information?

Quote:
Originally Posted by camc3r View Post
I got this one!
problem- car sitting and then starts rough sometimes almost wanting to die.
reason - oil draining down to the oil pan and or not thick enough to stay in the engine while off
solution - never run anything lower than 5w30 non synthetic or 10w30 synthetic.
5w30 is 5w30 is 5w30! Doesn't matter if it's synthetic or not. It's a measurement of viscosity (how quickly the oil flows), not some arbitrary number. Oil is going to drain to the pan. Gravity does that. I'm sure the engineers at Honda took that into account when they recommended 5w30 for these engines.

Quote:
Originally Posted by camc3r View Post
2) if you dont drive for a few days or longer its ALWAYS a good idea to pull the ECU fuse from under the hood, crank it for about 20 sec. (you will hear the compression go back up) replace fuse and start.
3)of course make sure your oil is never to low
Good to know! In more than 21 years of driving, sometimes leaving a car sit for weeks, this is the first time, I've ever heard someone suggest this, let alone claim that it is "ALWAYS a good idea". To me, this sounds like nothing more than putting a band-aid on a larger problem. That's fine, if the goal is to get by for a few more weeks, but it will not fix the problem.

Quote:
Originally Posted by camc3r View Post
I am running royal purple 5w30 bc it was almost winter and I thought i was going to drive it during winter. However synthetic is thinner and 5w is thinner than 10w so trust me when I say 5w synthetic is WAY to thin to run. I will be switching back to 10w in about 1k miles. Running thicker oil will quite your engine noise down a little as well ie. ticking or other head noises.
See above.
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Old 09-13-2011, 05:04 PM   #6 (permalink)
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Is fine to run either 10w30 or 5w30... personally i'd run the thinner one... they gets to where they suppose to be quicker... running a slightly thinner oil is also better for colder weather. Also, thicker oil doesn't mean it gives you better protection, just because you "think" its thicker so it sticks on it and thus provide protection... This is a good read

If anything that would cause your engine to run rough for a first few seconds, is because all oil had been drained back to the oil pan, and it takes a few seconds for the oil to fill up the pump and system etc... and slightly thinner oil will definitely help the oil get to where they need to be quicker.

Also looking at this chart, i wouldn't worry about using 5w20 or 5w30 for B/K-series engine.
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Last edited by codenamezero; 09-13-2011 at 05:08 PM.
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Old 09-13-2011, 05:53 PM   #7 (permalink)
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I am interested in this topic for the fact that once I put my supercharger on, I noticed hard starts after the car has sat over night. And with the weather cooling down, I notice it alot more. With that said - it only happens on the first start of the day or after my car has set for long enough to cool off completely.
I have a feeling that it may be a lack fuel pressure related (i.e. it falls off overnight or after extended sittin time). Can anyone back up my theory?

Background on my setup - Stock fuel system (worked perfect before the SC), brand new battery, starter in working order
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Old 09-13-2011, 06:09 PM   #8 (permalink)
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Quote:
Originally Posted by johnnymass View Post
I have a feeling that it may be a lack fuel pressure related (i.e. it falls off overnight or after extended sittin time). Can anyone back up my theory?

Background on my setup - Stock fuel system (worked perfect before the SC), brand new battery, starter in working order
that should be taken care of when your fuel pump primes before you start the car, shouldnt it?
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Old 09-13-2011, 06:15 PM   #9 (permalink)
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i wouldn't think the oil would have much to do with how the car was idling unless there was a very serious issue. idle is really related to combustion and oil is lubrication. while obviously tied in with each other, these two systems effect different things differently. if there's a rough idle that gets cleared out, i'd say it's an issue with air, fuel or spark. really only time oil would affect idle quality would be at 20 degrees or lower... hows your fuel filter, spark plugs, wires? how cold is it where you are?
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Old 09-13-2011, 06:31 PM   #10 (permalink)
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^ I second the above comment.

Hold your key in the "On" position for a few seconds if your car has been sitting for a few days to let your fuel system fully prime. Then start your car.

could be a dirty fuel filter, or bad check valve allowing fuel to leak back into the tank.

If that doesn't help at all, check your plugs.

Do the easy simple things first, then get into the bigger stuff if you have to.
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Old 09-13-2011, 07:16 PM   #11 (permalink)
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If you are parking outside you might have some condensation build up due to changing overnight temperatures. Check the items in the comment above^
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Old 09-13-2011, 09:30 PM   #12 (permalink)
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Its not cold. Im in OK and it was 50-60 degrees for a few mornings and the car started extra rough but once it started it idled fine (fast idle that is)
Ive started to leave my key in the on position for a few seconds before i start the car. Yet still the same problem. I have one or two step colder plugs (possible problem right there?)
fuel filter was changed at about 100k. so its due but I dont believe it is the cause since it started after the SC
where is the check valve and whats the best way to test it?
ill make sure to check all the plugs and wires. ive been needing to check them after about 500miles post boost.
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