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Old September 8th, 2006, 10:28 PM   #1
BigBlueBurban
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Default my engine wont start

i just got finished rebuilding my throttle body. Got it put back on, checked for leaks with system pressurized, everything was fine. Go to start it... it wont start. Looks like battery's dead b/c it starts to crank, then stops. checked, battery was fine. so i'm kinda stumped. the engine will start to turn over, then it stops like it's hitting a brick wall. starter's trying to move it cuz all the interior lighting will dim or go out until i stop turning the key. really frustrated now b/c i haven't been able to drive her for over a week now... (longer story). any ideas?
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Old September 8th, 2006, 11:08 PM   #2
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why did you rebuild the throttle body? Was it leaking bad? If so you might have the cylinders full of gas, causing hydro lock. Pull plugs and crank over to clear out gas. Might want to disconnect coil so you don't ignite the gas blowing out the cylinders accidentally.
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Old September 9th, 2006, 12:37 AM   #3
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Check the resistance in your battery cables.. mine did the same thing after i rebuilt the engine. and the battery cables just went bad over time... But try what green said 1st.
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Old September 10th, 2006, 05:25 PM   #4
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i didn't rebuild it for any particular reason. just was interested so just decided to take it apart one afternoon. I'll have to try taking out the plugs and cranking it to see if the hydrolock thing might be a possibility, but somethings telling me probably not. i'll look into it after dinner.
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Old September 10th, 2006, 08:38 PM   #5
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just took a closer look... there was WAY to much gas in the engine... it was seeping thro the gaskets on my exhaust collectors. so i took out the plugs and cranked it a few to get the excess out. turned the heat way up in the garage and i'm just gonna let it sit overnight until i have time to work on it tommorow. many this shit sucks
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Old September 10th, 2006, 09:47 PM   #6
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make sure you change the oil when you get it straightened out. I'm sure the gas got in the oil also. It will wipe out your bearings in no time.
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Old September 12th, 2006, 05:59 PM   #7
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ok so did what i posted above to no avail. watched the injectors while my buddy turned it over and holy shit, it's like noah's flood in there. i think the actual fuel meter may be bad, so now i have to replace that.... i just want my truck back:miff:
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Old September 12th, 2006, 06:21 PM   #8
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Quote:
Originally Posted by BigBlueBurban
ok so did what i posted above to no avail. watched the injectors while my buddy turned it over and holy shit, it's like noah's flood in there. i think the actual fuel meter may be bad, so now i have to replace that.... i just want my truck back:miff:
Before you run off buying shit you can't return, try a few other things. What "fuel meter" are you talking about?

From your description, it sounds like you have a 454 that is port-fuel injected (or do you have two injectors in a throttle body?). I'm not sure what that used for air metering: do you have a mass air-flow sensor or a MAP sensor. To see if it's one of those sensors causing the problem, unplug it and try to start it again. Your ECU should have a base map for the engine to run, albiet roughly, when a sensor fails.

Also, you can buy a cheap set of "noid" lights at murray's to check your signal going to your injectors - this is to see if they are being commanded on, or you have some that are stuck open.

Also, what do you mean by "rebuilt"?
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Old September 12th, 2006, 08:33 PM   #9
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Quote:
Originally Posted by BigBlueBurban
ok so did what i posted above to no avail. watched the injectors while my buddy turned it over and holy shit, it's like noah's flood in there. i think the actual fuel meter may be bad, so now i have to replace that.... i just want my truck back:miff:

I was the buddy who started it and it just sounds really week and wont fire. But i watched as bigblue tried starting it and it looked like the pettle was just being help wide open and just continiously pouring gas into the buttlerflies. There was a flow of gas about the size of a dime pouring in for a really long time.
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Old September 12th, 2006, 08:46 PM   #10
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Default Computer??

Just a thought..........
I have had an intermittent problem with mine.
Try turning on the ignition (key forward 2 clicks).
Let it sit that way for 20 minutes (no more no less).
Turn it off and try starting.
This resets the computer.
Works every time for me.
Good luck!!
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Old September 12th, 2006, 10:05 PM   #11
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i'll give that computer reset a shot. the fuel meter thing i'm refering to is on the back of the injector pod (TBI). no MPI, no MAF sensor, nada - oldschool 454. i think one of the injectors may be screwed up because only one was pouring out gas like a mofo, the other one i didn't notice it from so much.
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Old September 12th, 2006, 10:08 PM   #12
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scooter:
Quote:
Originally Posted by BigBlueBurban
i didn't rebuild it for any particular reason. just was interested so just decided to take it apart one afternoon. I'll have to try taking out the plugs and cranking it to see if the hydrolock thing might be a possibility, but somethings telling me probably not. i'll look into it after dinner.
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Old September 13th, 2006, 09:53 AM   #13
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i'll take pictures today of what i'm talking about to clear up an hazy areas.
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Old September 14th, 2006, 06:50 AM   #14
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More brainstorming is leading me to believe that one of the injectors is faulty. one still sprays the mist and pulses whereas the other one looks like it's trying to feed the engine at WOT. And if this doesn't work.... well i dont want to think about that.
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Old September 14th, 2006, 02:40 PM   #15
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if you hold wot wile cranking it should go into clearflood mode and the injectors shouldnt be spraying. if one is and not the other it may be stuck open and just spraying all the time the pump is running. you should be able to check that by having you budy key on not crank it and look to see if the injector is spraying. if i remember those injectors are powered by the same wire? if they are and one works right that should rule out electrical. and on a side nope dont fix shit that isnt broken you said it was working and you did this for the hell of it.
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Old September 15th, 2006, 09:13 AM   #16
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yup learned that one the hard way. anyways, there are two wires running to each injector. really weird thing happened last night tho. i replaced the injector that was spraying like a flood.... and that side still does it. i unhooked the fuel pump relay and fuse which the last two times worked... but somehow when i did it this time and turned it over to get out the excess gas, the fuel pump still pressurized and flooded it again. so right now, i'm quitting and waiting for a reply from my gramps. if all goes well, i'll get it over there somehow and start to rebuild the engine. which leads me to a question or two. i'm looking to make more power and was thinking about boring it out. would this be a good way to go, or should i start with a larger block from somewhere (like a 502), rebuild that and drop that in. i don't really care about how much fuel this thing will use (once it is running) as, sadly, it is no longer my DD. So now that i have more time, i'm going to research my options more and make a definate decision on what i want to do. the more power... the better
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Old September 15th, 2006, 11:20 AM   #17
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ill give u $50 for it?
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Old September 16th, 2006, 09:28 PM   #18
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ha ha your hilarious..... ............ ...............:miff:
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Old September 17th, 2006, 08:06 PM   #19
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why are you rebuilding it? you might want to get it running first. you'll just have the same flooding issue on top of a bebuilt engine.
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Old September 19th, 2006, 07:21 PM   #20
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UHHH yeah what ^ he said
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