#5 piston melted
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From: Thibodaux Louisiana
#5 piston melted 02 Firehawk with a STS kit at just 5lbs all stock other than 42lb inj. valve springs,pushrods and 3200 vig converter. All the other cyl. looked great just the #5 looked as if it went lean for some reason? Anyone ever had this happen? I need to try and figure this out b-4 the engine goes back together as i don't want it to happen again. If the tune was off why just the #5 and not all the cyl.? I thought the # 7 was the first one to go most of the time. Thanks guys.
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From what the tuner told me the A/f was 11.5 and timing was 16 deg. On the dyno the car would never pull past 4700 so the springs were installed but did not help.So the tune was never complete. He took it on the street and maybe made one hard run with it. that's when it happened started blowing oil from everywhere. The tuner didn't figure out what was wrong with it. He is going to take it to another local tuner when it is back together Do you think the fuel pump was maxed out and that was just the last cyl. to get fuel and then went lean?
Yeah, you can't really make any hard runs at all until the tune is damn safe (rich and lo-advance). Datalogging is needed to see what is happening. Too bad he blew it and probably won't pony up a dime.
Jim
Jim
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From: Thibodaux Louisiana
Well I'm not blaming the tuner. Just trying to see what the problem is so it doesn't happen again.The tuner is top notch i just don't understand why he could not get a better grip on what was going on. So i posted on here to see if anyone had any ideas. I have some pics I'll try to get up tomorrow night.
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From: australia
i donot know what a sts kit is...
but
if it is fuel injected, then why not that injecter faulty?
if the injected faulty, and restricted.. it will burn up the plug and if hot enough, will torch the piston and the exhaust valve will be overheated.
same as us mechanical injected boys... if we have a block nozzel, booooom , THAT CYLINDER LEANS OUT.
Can you test the injecters , or put them on a flow bench to test flow volumes?
if the fuel pump was maxed, and the whole system would go lean, then the rear 2 cylinders should have shown lean cylinders.., if the efi fuel rails were feed from the front...
what does the spark plug " say"
post a picture of it...
has the earth electrode burnt of??
wash the spark plug with white spirts, and see if the "cad plating" is burnt off the base circle.
compare it to a new plug, straight out the box, better still post a side- by - side pic of new and # 5 plug...
does this engine have coil packs?
could that cylinder spark have been advanced?
heaps of reasons, not necassery the tuners fault, BUT could be too...
cheers
ash
but
if it is fuel injected, then why not that injecter faulty?
if the injected faulty, and restricted.. it will burn up the plug and if hot enough, will torch the piston and the exhaust valve will be overheated.
same as us mechanical injected boys... if we have a block nozzel, booooom , THAT CYLINDER LEANS OUT.
Can you test the injecters , or put them on a flow bench to test flow volumes?
if the fuel pump was maxed, and the whole system would go lean, then the rear 2 cylinders should have shown lean cylinders.., if the efi fuel rails were feed from the front...
what does the spark plug " say"
post a picture of it...
has the earth electrode burnt of??
wash the spark plug with white spirts, and see if the "cad plating" is burnt off the base circle.
compare it to a new plug, straight out the box, better still post a side- by - side pic of new and # 5 plug...
does this engine have coil packs?
could that cylinder spark have been advanced?
heaps of reasons, not necassery the tuners fault, BUT could be too...
cheers
ash
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From: Nashville, TN
i donot know what a sts kit is...
but
if it is fuel injected, then why not that injecter faulty?
if the injected faulty, and restricted.. it will burn up the plug and if hot enough, will torch the piston and the exhaust valve will be overheated.
same as us mechanical injected boys... if we have a block nozzel, booooom , THAT CYLINDER LEANS OUT.
Can you test the injecters , or put them on a flow bench to test flow volumes?
if the fuel pump was maxed, and the whole system would go lean, then the rear 2 cylinders should have shown lean cylinders.., if the efi fuel rails were feed from the front...
what does the spark plug " say"
post a picture of it...
has the earth electrode burnt of??
wash the spark plug with white spirts, and see if the "cad plating" is burnt off the base circle.
compare it to a new plug, straight out the box, better still post a side- by - side pic of new and # 5 plug...
does this engine have coil packs?
could that cylinder spark have been advanced?
heaps of reasons, not necassery the tuners fault, BUT could be too...
cheers
ash
but
if it is fuel injected, then why not that injecter faulty?
if the injected faulty, and restricted.. it will burn up the plug and if hot enough, will torch the piston and the exhaust valve will be overheated.
same as us mechanical injected boys... if we have a block nozzel, booooom , THAT CYLINDER LEANS OUT.
Can you test the injecters , or put them on a flow bench to test flow volumes?
if the fuel pump was maxed, and the whole system would go lean, then the rear 2 cylinders should have shown lean cylinders.., if the efi fuel rails were feed from the front...
what does the spark plug " say"
post a picture of it...
has the earth electrode burnt of??
wash the spark plug with white spirts, and see if the "cad plating" is burnt off the base circle.
compare it to a new plug, straight out the box, better still post a side- by - side pic of new and # 5 plug...
does this engine have coil packs?
could that cylinder spark have been advanced?
heaps of reasons, not necassery the tuners fault, BUT could be too...
cheers
ash
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From: Thibodaux Louisiana
Thanks for all the help guys. I don't think the tune was the problem. The other 7 cyl's all looked pig rich.That goes with what the Tuner was saying. The #5 however is blasted clean No carbon at all the plug shows lean but is not burnt The electrode is not melted. I'll try to get pics up of the piston And plugs. Right now I'm leaning towards the injector not flowing like it should for whatever reason. it could be something in the harness or trash caught in the injector or maybe even a computer problem. If anyone has any more ideas feel free to post them up. Thanks guys!!!!
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From: Thibodaux Louisiana
It's melted. All the ring lands so the rings broke and scored up the wall. Also i have to check the turbo for damage. I found piston parts and ring bits in the oil pan.
Whew, that's a pain. I had 3 stock pistons let go, three years ago. When I found bits of them in the intake, I knew they had gone out the exhaust for sure.
Hopefully the turbo is ok. Good luck with it!
Hopefully the turbo is ok. Good luck with it!
Thread Starter
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From: Thibodaux Louisiana
This one melted through the ring lands in the front of the piston the top looks melted and the rings and lands look broken. I'll try to get some pics up. i'm trying to see if anyone local flow tests injectors.