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Need help with troubleshooting Starting issue..

 
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Old 02-07-2013, 09:56 PM
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Need help with troubleshooting Starting issue..

I have an 87 prelude that won't start it i have checked to make sure if fuel pump was bad and it wasn't i've also checked spark plugs and well i know they're good since the car does start when starting fluid is sprayed i thought it could be the main relay/ fuel pump relay prior but since the pump does function well that's out of the question one weird thing though i removed the fuel line leading to the fuel filter and cranked the car to see if any gas would pour and well none did... i heard it could be maybe clogged/dirty injectors but im not so sure another thing im worried about is that the car seems to have a short somewhere... it used to make this weird static noise from under the glove box or somewhere close to that before it went bad, which is why i bought a circuit light tester to make sure and yup the light stays on signaling a short somewhere in the car... ive already checked all fuses and relays one by one and all possible wires also... and another thing is before the car went completely dead it had a hard time starting up in the morning (normal weather) and when parked on a small uphill... Please help im lost..
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Old 02-07-2013, 10:23 PM
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Re: Need help with troubleshooting Starting issue..

circuit light tester? i have used a test light, but it lighting up meant that i was getting power to wherever i had the light.

do you have a prelude si or s? (fuel injected or carb'd)

what did you do to test the fuel pump? done a compression test? did it die while driving, or just wouldn't start one morning?

edit: i see you said it could be clogged injectors, but that car came with either fuel injection or carbs i believe.
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Old 02-07-2013, 11:03 PM
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Re: Need help with troubleshooting Starting issue..

Thanks for the replay man and well the car is fuel injected sorry i forget to mention that, and well as for the circuit tester i was told to get one and attach the alligator clip to the nut on the negative terminal and the end of the rod with the light itself to the negative side of the battery.. i even removed the main relay and it always starts with starting fluid kinda clueless what the problem could be as of now...
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Old 02-07-2013, 11:08 PM
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Re: Need help with troubleshooting Starting issue..

if it runs with starting fluid, then it is probably a fuel issue. how did you test the fuel pump? it is under the trunk. in my car, i can hear a hum for about 2 seconds when i turn the car to run, which is the pump priming. if i turn the ignition to start without pushing the clutch, i can hear the hum start and stay until i release the key or press the clutch. make sure you can hear the pump running.
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Old 02-07-2013, 11:12 PM
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Re: Need help with troubleshooting Starting issue..

i tested the pump the same way i heard it running aswell i even got it out and tested it with the battery running a wire from the negative to the negative on the pump and positive to the positive on the pump, and it was working fine i even got a little gas can i had out and simulated the way it works with a little hose going from the pump to the gas can and it sucked the gas and everything okay...
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Old 02-07-2013, 11:15 PM
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Re: Need help with troubleshooting Starting issue..

ok, and this seems like kind of a silly question, but are you sure there is fuel in the tank?
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Old 02-07-2013, 11:19 PM
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Re: Need help with troubleshooting Starting issue..

its okay and yeah im sure i even dropped the tank today aswell drained about 6gallons of gas prior and well reason being was i thought the pump would be in there but then i consulted the manual and well yeah served as a good experience though i supposes. but yeah man i had a friend/mechanic come over and diagnose it really quick the other day he said it could be the injectors themselves but would the car not turn on at all even with starting fluid if it was bad/dirty injectors..?
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Old 02-07-2013, 11:24 PM
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Re: Need help with troubleshooting Starting issue..

unless all 4 went bad at the same time, it seems unlikely. if there is one clogged injector, the other 3 will still work, and you will just get a check engine light and code. could be a clog in the fuel line somewhere. you said you were not getting any gas out of the line going into the filter? but you are getting gas coming out of the pump? that suggests that there might be a clog or kink somewhere in the line between the pump and filter.
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Old 02-07-2013, 11:30 PM
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Re: Need help with troubleshooting Starting issue..

hmm good point could it really be that..? wouldnt at least a little bit of gas go through though..? but yeah no gas was spilling near the filter at all when i cranked the engine and over by the fuel pump the moment i removed it a bunch of gas went all over the place so my best bet would be follow the fuel lines and wash them out with gas or what im going to probably have to lift the car pretty high up in that case since the fuel line is pretty hard to find in some places..

Last edited by queso101; 02-07-2013 at 11:34 PM.
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Old 02-07-2013, 11:39 PM
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Re: Need help with troubleshooting Starting issue..

did you disconnect the line going into the filter from the pump? or going from the filter to the engine? try disconnecting the line going from the pump to the filter at the filter.

pump=>line=>filter=>line=>fuel rail=>injectors
make sure you have flow at all spots. it could easily just be a clogged filter, which wouldn't be that surprising on a 25 year old car.
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Old 02-07-2013, 11:50 PM
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Re: Need help with troubleshooting Starting issue..

i disconnected the line going into the filter yes, and no gas spewed out when i cranked the engine.. i read somewhere that the car could possibly have 2 fuel filters but i think thats on the carburated version.. none the less when i removed the filter the first time wow it had chunks of blackness and all other stuff in it i cleaned it well with gasoline prior to testing it with the line going into it removed and still nothing not a drop of gas in it when i removed it once more...
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Old 02-07-2013, 11:58 PM
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Re: Need help with troubleshooting Starting issue..

do you have an air compressor? you could try blowing out the line with both ends disconnected. that black stuff could just be clogging the line. i would also recommend replacing the fuel filter.
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Old 02-08-2013, 12:03 AM
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Re: Need help with troubleshooting Starting issue..

okay i'll try that out yes i have a 90psi air compressor hopefully thats enough ill just need to disconnect both lines insert the end of the compressor and hopefully it clears out all the junk.. if that doesn't end up working though what else could be the issue..?
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Old 02-08-2013, 12:12 AM
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Re: Need help with troubleshooting Starting issue..

well, i havent heard of more than one fuel filter on a car, but i can see the importance of it if it were the carb'd version. i believe the fuel system runs at about 60 PSI, so i wouldn't push too much air through it, just enough to hopefully push through any clogs. once the line is clear, i dont see why the pump wouldn't be able to get fuel to the filter, and once the filter is replaced, the fuel should get to the engine.
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Old 02-08-2013, 12:19 AM
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Re: Need help with troubleshooting Starting issue..

alright man ill go ahead and buy the filter once more then and after cleaning it out with the air and all ill try removing one of the lines once more.. if the fuel does get the filter this time with it replaced and all but doesn't leave the filter what could it be then should i clean the line going out the filter with air aswell or is that a whole new thing sorry for all the questions btw just wanna tackle this tomorrow with plan its been 3 weeks already since it "broke down"
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Old 02-08-2013, 12:44 AM
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Re: Need help with troubleshooting Starting issue..

i would just clean as much as you see necessary. sounds like you have most of it apart already, dropping the fuel tank is probably the hardest part. really a fuel system needs to build up pressure to start the car, and if something blocks that pressure or even drops it 10 PSI from where it should be, it could make the car not start. if you found black stuff on the tank side of the filter, then it is most likely the cause of the failure.

good luck getting the lude running!
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Old 02-08-2013, 12:54 AM
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Re: Need help with troubleshooting Starting issue..

alright that would explain why first time starts would be a pain aswell as little up hill parking spots but thanks for all the advice and help man i hope to get it fixed by tomorrow if not for sure before i leave to boot but once again thanks for the help hopefully this finnaly fixes the lude i miss cruising in it haha
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Old 02-08-2013, 12:56 AM
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Re: Need help with troubleshooting Starting issue..

glad to help! and if you need a shop manual, download one from here! :D http://www.preludezone.com/general-t...e-manuals.html
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Old 02-08-2013, 02:32 PM
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Re: Need help with troubleshooting Starting issue..

hey man i tried cleaning the lines with the air compressor and the air did make it to the fuel filter the thing is the fuel doesn't i mean the pump is pumping the gas out and everything just that the fuel doesn't seem to make it to the filter which is the obvious reason as to why the car won't start.. but why.. why does the air make it through to the filter but not the fuel..?

Could it be that the fuel pump isn't sending out enough pressure to send the fuel up to the filter, it might be the reason why the car would really struggle in little raised parking sports like i mentioned earlier.. im thinking about getting a fuel pressure tester and see whats going on with that but what would be the ideal pressure..? 60psi..?

Last edited by queso101; 02-08-2013 at 02:53 PM.
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Old 02-08-2013, 02:54 PM
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Re: Need help with troubleshooting Starting issue..

just need to keep working your way back through the system until you find pressure. when the air goes through the line, is it coming out the other side? there is no holes in the line? did you see any fuel or gunk come out when you blew it out?

if you remove the access panel for the pump, or however you do it, and turn the ignition on to make sure the pump is turning on, that is the next thing to check to be positive about. once you know if the pump is turning on, disconnect the line and hold a rag over it and turn it on. you should have fuel pumping out. if fuel is pumping out, hold the rag and your finger over the hole, if should build up pressure.

system could need to be primed (fuel in the line from the tank through the pump and through the line) if you were to hook up the lines, the pump is supposed to pump the system up to 40-60 whatever the system is supposed to be at. there should be a bleeder on the fuel rail that will help get air out of the fuel lines.

you can also download a shop manual http://www.preludezone.com/general-t...e-manuals.html
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Old 02-24-2013, 12:23 PM
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Re: Need help with troubleshooting Starting issue..

Perforated hose perhaps? Old rubber hose in the tank? That's where I'd start if I knew the pump works correctly.
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