Intermittent ignition problem
My 2001 Accent has trouble starting every few days. When this happens -- the
engine cranks but does not start -- it takes several tries to get it going. But once started, it gives me no trouble at all for a while. Between episodes, it starts fine on the first try. What's problematic is that this starting problem is intermittent, so I'm worried that if I just bring this to a mechanic he'd have to make a guess and replace a few things. It's not the battery or alternator (I had them tested at Autozone). It's probably not the air filter, spark plugs, fuel filter or air filter: they are all fairly new. Sometimes, I've seen erratic idling on cold start (RPMs go up and down). Sometimes, the engine seems a little noisy on cold start, but quiets down after about half a min. Any suggestions on how to approach this? Thanks. Chris |
Re: Intermittent ignition problem
"Christopher Wong" <cwong@world.std.com> wrote in message news:GJSdnWT_Gv2L1iHZnZ2dnUVZ_oGdnZ2d@rcn.net... > My 2001 Accent has trouble starting every few days. When this happens -- > the > engine cranks but does not start -- it takes several tries to get it > going. > But once started, it gives me no trouble at all for a while. Between > episodes, it starts fine on the first try. What's problematic is that this > starting problem is intermittent, so I'm worried that if I just bring this > to a mechanic he'd have to make a guess and replace a few things. > > It's not the battery or alternator (I had them tested at Autozone). It's > probably not the air filter, spark plugs, fuel filter or air filter: they > are all fairly new. Sometimes, I've seen erratic idling on cold start > (RPMs > go up and down). Sometimes, the engine seems a little noisy on cold start, > but quiets down after about half a min. Any suggestions on how to approach > this? Thanks. > > Chris First figure out if it's a fuel or spark issue. Check for spark when it doesn't want to start. Also, make sure that you hear the fuel pump for a few seconds when you first turn on the key. None of the things you mentioned will cause the symptoms you describe other than - maybe - a fuel filter full of water or other stuff. But then, it would be unlikely that the car would run well between episodes. You could be looking at a fuel pump, PCM, CPS, fuel pump relay, etc. First, figure out if it's fuel or ignition. |
Re: Intermittent ignition problem
"Christopher Wong" <cwong@world.std.com> wrote in message news:GJSdnWT_Gv2L1iHZnZ2dnUVZ_oGdnZ2d@rcn.net... > My 2001 Accent has trouble starting every few days. When this happens -- > the > engine cranks but does not start -- it takes several tries to get it > going. > But once started, it gives me no trouble at all for a while. Between > episodes, it starts fine on the first try. What's problematic is that this > starting problem is intermittent, so I'm worried that if I just bring this > to a mechanic he'd have to make a guess and replace a few things. > > It's not the battery or alternator (I had them tested at Autozone). It's > probably not the air filter, spark plugs, fuel filter or air filter: they > are all fairly new. Sometimes, I've seen erratic idling on cold start > (RPMs > go up and down). Sometimes, the engine seems a little noisy on cold start, > but quiets down after about half a min. Any suggestions on how to approach > this? Thanks. > > Chris First figure out if it's a fuel or spark issue. Check for spark when it doesn't want to start. Also, make sure that you hear the fuel pump for a few seconds when you first turn on the key. None of the things you mentioned will cause the symptoms you describe other than - maybe - a fuel filter full of water or other stuff. But then, it would be unlikely that the car would run well between episodes. You could be looking at a fuel pump, PCM, CPS, fuel pump relay, etc. First, figure out if it's fuel or ignition. |
Re: Intermittent ignition problem
"Christopher Wong" <cwong@world.std.com> wrote in message news:GJSdnWT_Gv2L1iHZnZ2dnUVZ_oGdnZ2d@rcn.net... > My 2001 Accent has trouble starting every few days. When this happens -- > the > engine cranks but does not start -- it takes several tries to get it > going. > But once started, it gives me no trouble at all for a while. Between > episodes, it starts fine on the first try. What's problematic is that this > starting problem is intermittent, so I'm worried that if I just bring this > to a mechanic he'd have to make a guess and replace a few things. > > It's not the battery or alternator (I had them tested at Autozone). It's > probably not the air filter, spark plugs, fuel filter or air filter: they > are all fairly new. Sometimes, I've seen erratic idling on cold start > (RPMs > go up and down). Sometimes, the engine seems a little noisy on cold start, > but quiets down after about half a min. Any suggestions on how to approach > this? Thanks. > > Chris First figure out if it's a fuel or spark issue. Check for spark when it doesn't want to start. Also, make sure that you hear the fuel pump for a few seconds when you first turn on the key. None of the things you mentioned will cause the symptoms you describe other than - maybe - a fuel filter full of water or other stuff. But then, it would be unlikely that the car would run well between episodes. You could be looking at a fuel pump, PCM, CPS, fuel pump relay, etc. First, figure out if it's fuel or ignition. |
Re: Intermittent ignition problem
I had a similar problem on a Dodge. This went on for several months and it could go for several weeks without a problem. It turned out to be a cam sensor but it couldn't be tracked down until the check engine light went on so that the code could be read. |
Re: Intermittent ignition problem
I had a similar problem on a Dodge. This went on for several months and it could go for several weeks without a problem. It turned out to be a cam sensor but it couldn't be tracked down until the check engine light went on so that the code could be read. |
Re: Intermittent ignition problem
I had a similar problem on a Dodge. This went on for several months and it could go for several weeks without a problem. It turned out to be a cam sensor but it couldn't be tracked down until the check engine light went on so that the code could be read. |
Re: Intermittent ignition problem
Check for trouble codes in the ECM. It's possible it saw an issue but the
problem didn't repeat, so the check engine lamp is not yet on. Also, when the vehicle cranks, does it crank normally, slowly, or quickly? |
Re: Intermittent ignition problem
Check for trouble codes in the ECM. It's possible it saw an issue but the
problem didn't repeat, so the check engine lamp is not yet on. Also, when the vehicle cranks, does it crank normally, slowly, or quickly? |
Re: Intermittent ignition problem
Check for trouble codes in the ECM. It's possible it saw an issue but the
problem didn't repeat, so the check engine lamp is not yet on. Also, when the vehicle cranks, does it crank normally, slowly, or quickly? |
Re: Intermittent ignition problem
On 2006-07-18, hyundaitech <notpublic@not.public.com> wrote:
> Check for trouble codes in the ECM. It's possible it saw an issue but the > problem didn't repeat, so the check engine lamp is not yet on. > > Also, when the vehicle cranks, does it crank normally, slowly, or quickly? Thanks to you and others for replying. I did not realize that codes could be set if the check engine light is not lit. Anyway, I had Autozone scan the OBD-II, and came up empty. Even when it has trouble starting, the engine cranks normally. I don't get it. Apart from these intermittent starting problems, the car runs normally. Chris |
Re: Intermittent ignition problem
On 2006-07-18, hyundaitech <notpublic@not.public.com> wrote:
> Check for trouble codes in the ECM. It's possible it saw an issue but the > problem didn't repeat, so the check engine lamp is not yet on. > > Also, when the vehicle cranks, does it crank normally, slowly, or quickly? Thanks to you and others for replying. I did not realize that codes could be set if the check engine light is not lit. Anyway, I had Autozone scan the OBD-II, and came up empty. Even when it has trouble starting, the engine cranks normally. I don't get it. Apart from these intermittent starting problems, the car runs normally. Chris |
Re: Intermittent ignition problem
On 2006-07-18, hyundaitech <notpublic@not.public.com> wrote:
> Check for trouble codes in the ECM. It's possible it saw an issue but the > problem didn't repeat, so the check engine lamp is not yet on. > > Also, when the vehicle cranks, does it crank normally, slowly, or quickly? Thanks to you and others for replying. I did not realize that codes could be set if the check engine light is not lit. Anyway, I had Autozone scan the OBD-II, and came up empty. Even when it has trouble starting, the engine cranks normally. I don't get it. Apart from these intermittent starting problems, the car runs normally. Chris |
Re: Intermittent ignition problem
Could be a bad crank sensor or relay.
When the condition occurs: Check for the check engine lamp during the bulb test. This means the computer powers and grounds properly when the ignition is on. Like the other poster(s) mentioned, you want to check to see if you have spark and injector pulse. Checking for spark is simple enough. Pull one of the plug wires and stuff an old spark plug in it and lay on something metal and then watch while cranking the engine. To check for injector pulse, you'll need a noid lamp (a lamp which plugs into the harness where the injector would normally plug in). If the noid lamp flashes, then you have injector pulse. The immediate things that come to mind as possible causes are a bad main or ecu relay, or a bad crank sensor. |
Re: Intermittent ignition problem
Could be a bad crank sensor or relay.
When the condition occurs: Check for the check engine lamp during the bulb test. This means the computer powers and grounds properly when the ignition is on. Like the other poster(s) mentioned, you want to check to see if you have spark and injector pulse. Checking for spark is simple enough. Pull one of the plug wires and stuff an old spark plug in it and lay on something metal and then watch while cranking the engine. To check for injector pulse, you'll need a noid lamp (a lamp which plugs into the harness where the injector would normally plug in). If the noid lamp flashes, then you have injector pulse. The immediate things that come to mind as possible causes are a bad main or ecu relay, or a bad crank sensor. |
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