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Third_Alarm
Virgo
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Posted: July 20 2004,10:45 pm |
Post # 1 |
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 I have been encountering a small problem lately and was wondering if anybody had any idea's. I have had hard starts intermitantly for a bit now. It turns over just fine but will not start. With a little encouragement from a bit o' starting fluid it starts great just to have it occur again. Maybe not this time or next but eventually. Sometimes it will be a cycle that has to be dealt w/ all day after every stop and others it never occurs. Water/fuel filter is new, fluids are fresh, new OPTIMA batt's (x2 875 MCA). It's a 1998 7.4 454 MPI (310 hp) Mercruiser with a Bravo 1 drive. Any idea's ????? 
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GoFastRacer
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Posted: July 21 2004,6:10 am |
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I would have to lean towards an electrical problem also. I had a similar problem in a car. I found out the problem by listening for the pump when I turned the key on, sometimes it wouldn't come on right away and sometimes it would, replaced the relay and it worked fine after that!...Just something to check!..
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Third_Alarm
Virgo
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Posted: July 21 2004,5:09 pm |
Post # 8 |
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| Quote (AZKC @ July 21 2004,7:37 am) | How many hours on the boat, Â  |
best guess without being by it would be 150 +/-. I had the engine scanned and it did not throw any trouble codes.
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GoFastRacer
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Posted: July 21 2004,8:17 pm |
Post # 10 |
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| Quote (Bullitt Bob @ July 21 2004,1:11 pm) | I think it's a fuel prime problem, since he says it fires up just fine if he shoots it with ether.
If this is fuel injected, I think the fuel's bleeding down. On FE systems, when the key is held to start, the fuel pump is bypassed and doesn't kick in until you let go. Try turning the key to just the on position, wait about 5 seconds and then crank it.
I'll bet it will light right off.  |
Right, but if you have a bad relay and the pump don't come on, it won't start that's how I found out my problem by turning on the key and listen for the pump, sometimes it would come on and sometimes it woudn't, a new relay cured it and I would say heat is the culprit because when it was cold it started right up, drive it for a while and park it, 10 minutes later it wouldn't start!.. 
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Bullitt Bob
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Posted: July 23 2004,2:22 pm |
Post # 12 |
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| Quote (GoFastRacer @ July 21 2004,8:17 pm) | | Right, but if you have a bad relay and the pump don't come on, it won't start that's how I found out my problem by turning on the key and listen for the pump, sometimes it would come on and sometimes it woudn't, a new relay cured it and I would say heat is the culprit because when it was cold it started right up, drive it for a while and park it, 10 minutes later it wouldn't start!.. |
I hear what you're sayin', Art, but 99.9% of people just grab the key and turn, without waiting for the pump to prime up. Every FE system I've seen bypasses the pump in the start position. 
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GoFastRacer
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Posted: July 23 2004,8:21 pm |
Post # 14 |
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| Quote (Bullitt Bob @ July 23 2004,2:22 pm) | | Quote (GoFastRacer @ July 21 2004,8:17 pm) | | Right, but if you have a bad relay and the pump don't come on, it won't start that's how I found out my problem by turning on the key and listen for the pump, sometimes it would come on and sometimes it woudn't, a new relay cured it and I would say heat is the culprit because when it was cold it started right up, drive it for a while and park it, 10 minutes later it wouldn't start!.. |
I hear what you're sayin', Art, but 99.9% of people just grab the key and turn, without waiting for the pump to prime up. Every FE system I've seen bypasses the pump in the start position. |
That's true nobody ever thinks about letting the pump build pressure!.  The reason they bypass it on the start is so there's full voltage to start with no extra drain on the battery!.. 
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Third_Alarm
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Posted: July 24 2004,1:39 am |
Post # 16 |
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OK, I have been stuck at work but will be home soon enough. I do hear the pump cycle every time the key is turned on and I too wait for the system to build pressure. The heat could very well be a factor and I have considered changing the fuel pump relay, plugs, etc and starting over. Because it has been so intermittant it is hard to replicate in order to trouble shoot. I'll keep all of posted. BTW, thanks for all the great imput!
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Bullitt Bob
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Posted: July 24 2004,7:06 am |
Post # 17 |
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| Quote (Third_Alarm @ July 24 2004,1:39 am) | | OK, I have been stuck at work but will be home soon enough. I do hear the pump cycle every time the key is turned on and I too wait for the system to build pressure. The heat could very well be a factor and I have considered changing the fuel pump relay, plugs, etc and starting over. Because it has been so intermittant it is hard to replicate in order to trouble shoot. I'll keep all of posted. BTW, thanks for all the great imput! Â |
I'm sure you'll have this straightened out shortly, whatever the problem is. Â
If you hadn't mentioned the motor fires right up with starting fluid, I also would've gone along with the ignition problem theory. I know we're dealing with a Chevy, but this has been a nagging issue with lots of guys, including myself, in my Mustang Bullitt club. In the summer heat especially, our cars exhibit the exact same symtoms you're having. Hit the key and you can crank 'til the battery drains and it won't light. Turn the key on, wait 5 seconds and she fires every time.
Modern technology. Â
Edited by Bullitt Bob on July 24 2004,7:07 am
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GoFastRacer
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Posted: July 24 2004,10:06 pm |
Post # 18 |
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| Quote (Bullitt Bob @ July 24 2004,7:06 am) | | Modern technology. Â |
Modern or old school, mechanical or electronic,(carb or injection) you still have to have fuel present to start. Carbs have an accellarator pump to deliver fuel on start up, EFI has to have pressure to supply fuel, mechanical injection just have to have the fuel at the nozzles!..
Edited by GoFastRacer on July 24 2004,10:07 pm
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Bullitt Bob
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Posted: July 25 2004,8:40 pm |
Post # 19 |
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| Quote (GoFastRacer @ July 24 2004,10:06 pm) | | Quote (Bullitt Bob @ July 24 2004,7:06 am) | | Modern technology. Â |
Modern or old school, mechanical or electronic,(carb or injection) you still have to have fuel present to start. Carbs have an accellarator pump to deliver fuel on start up, EFI has to have pressure to supply fuel, mechanical injection just have to have the fuel at the nozzles!.. |
Right on, Brother Buzz! 
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11-24-2024 Three Word Post.....The Next Generation.... (Rep.#19,435) from: BigDog
). Sounds alot like the same symptoms I had and it took me a year to figure it out. Ended uo going with a separate pushbutton starter switch and a kill switch for the ignition. No problems since.
