what are the odds?
08-15-2008, 04:15 PM
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what are the odds? Yesterday i was on my way to get my car tuned, so after i get there it goes right up on the dyno and everything seems to be going good after the first tweak with the fuel trim it was already sounding better at start up, the guy tuning it had it down to half a percent accurate on the air fuel trim. so it was within an hour of being done, it was ready to start getting some dyno pulls. he started checking the throttle ranges and when he revd it up to half throttle when it came back down to idle it died, out of nowhere he pressed the release valve on the fuel rails and he said like two or three drops came out he tried jumping the relay off another one to make sure it wasn't the fuse... now i'm stuck in between it being the fuel pump or the fuel filter being clogged, good news is i have a walbro pump already to replace it but if it's the filter i'm not gonna change the pump unless there's no other reason why it won't start. anybody have any suggestions what else it could be? i'm stranded up in north cali till i get it fixed... seems every time i try upgrading her she wants to struggle and have a fit... seriously any suggestions would be appreciated also if you need more info let me know
08-15-2008, 04:43 PM
#2
Yesterday i was on my way to get my car tuned, so after i get there it goes right up on the dyno and everything seems to be going good after the first tweak with the fuel trim it was already sounding better at start up, the guy tuning it had it down to half a percent accurate on the air fuel trim. so it was within an hour of being done, it was ready to start getting some dyno pulls. he started checking the throttle ranges and when he revd it up to half throttle when it came back down to idle it died, out of nowhere he pressed the release valve on the fuel rails and he said like two or three drops came out he tried jumping the relay off another one to make sure it wasn't the fuse... now i'm stuck in between it being the fuel pump or the fuel filter being clogged, good news is i have a walbro pump already to replace it but if it's the filter i'm not gonna change the pump unless there's no other reason why it won't start. anybody have any suggestions what else it could be? i'm stranded up in north cali till i get it fixed... seems every time i try upgrading her she wants to struggle and have a fit... seriously any suggestions would be appreciated also if you need more info let me know
08-15-2008, 04:45 PM
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ima go take a look at it today with my cousin and all his cool tools lol... thanks i wouldn't think a clogged filter would just plug all the way up but we'll see. i hear the pump start up but not pressure... maybe it's just going through the motions and not pumping? is that possible
08-15-2008, 04:46 PM
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the plugged filter may be the cause for the pump dying early, replace the filter and check for pressure, if no presssure check for power, if power is good then replace the pump.
08-15-2008, 04:48 PM
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ima go take a look at it today with my cousin and all his cool tools lol... thanks i wouldn't think a clogged filter would just plug all the way up but we'll see. i hear the pump start up but not pressure... maybe it's just going through the motions and not pumping? is that possible
08-15-2008, 06:02 PM
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One possibility is the fuel pressure regulator on the fuel-rail. If it got stuck open, you'd have pretty much no pressure, as the pumped fuel would just circle through the fuel-rail and return back to the tank.
08-15-2008, 10:14 PM
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did youre car ever do this before? have you noticed anything weird about its driving habits lately? what about the tuner, im not here to bash on no one but, did he double check to make sure nothing happened tuning wise?
08-16-2008, 01:41 AM
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yeah after it didn't want to start he flashed tuned the stock tune back in to make sure... i got my cousin to look at it today he went out there with a fuel pressure tester and it had operating pressure... checked the fuel injectors they were working properly... checked the spark plug wires eureka we got it no spark... called the tuner guy up and he said that bad crankshaft sensor would equal no spark... well checked the ground on the back of the driver head i know it was screwed in tight because i went to tighten it and my buddy already had done it... so i bought a new crankshaft sensor today and will go try that tomorrow keep your fingers crossed... any other suggestions or does that sound about right? the tuner guy told me ls1's are notorious for f'n up crank sensors... i don't know but hey it makes sense my cousin said no crank sensor no spark... so i guess we'll see tomorrow i'll keep you guys updated just in case any of you ever run into this problem "cranks but won't start." oh yeah changed the fuel filter just because... if anybody else has any ideas i would greatly appreciate it as i don't want to be stranded here when my classes start on monday. could get a bus ticket but it's not a camaro lol
08-16-2008, 01:47 AM
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i'm here to try to find out what's wrong with my car. he flashed the stock tune back in before he said it wouldn't start... SERIOUSLY CAN'T STRESS IT ENOUGH DIDN'T EVER QUESTION HIM OR HIS WORK... JUST TRYING TO ANALYZE lol the only thing i'm mad about is i haven't got to beat on my car since the mods
i just want to drive is all lol
08-16-2008, 04:06 AM
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most likely the pump man, when a pump goes out its most likely the fin that pushes the fuel through the electric motor, so u may hear the pump spinning but its not pressurizing any fuel
08-16-2008, 10:54 AM
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well i'll find out today if it's the crankshaft sensor which isn't letting me get spark... and ae it's not the pump it had operating pressure and was working just fine... i'll know by later today if it was the sensor that was screwing **** up or not we'll see and Formula i thought it might be the coil packs too but what are the odds they all go bad on one shot i don't even know if that's possible but thank you everyone i appreciate your advice and past run ins with these sort of things keep it coming because if i can't get it to run today it's going to have to be towed... and it doesn't look as good in the back of a flat bed as it does on the street.
