Spark plug melted badly!

**4seasons69** · 06-12-2012

Ok so here's what's going on. I was on the dyno last Friday up at db and was having a large voltage drop so the car couldn't really be tuned up top. Shane thought it would be safe to drive and said to not take it above 7500 rpm. So i got most of the way home and the alternator went out. I put a new alternator in it and then drove it to a friends house, then to work on Saturday, the I drove it some on sarurday evening.

The whole time I was driving it I never brought it high Into the rpms and never went more than maybe half throttle at most. It seemed to run fine the whole time too.

So sunday I went to move the car from my work to my buddies house. Same thing as Saturday seemed to be running fine I was just cruising a long with traffic and it started sputtering then died. I pulled tried restarting it it started with a huge plume of smoke then died and wouldn't restart. So i had it towed to my buddies place.

Today I was checking it out and found the cylinder 3 plug extremely melted. Anybody have any ideas what would cause this without even beating on the car? I'm not sure what the total extent of the damage is yet. Thanks for any input!

**JET** · 06-13-2012

Likely detonation... Get it fixed and back on the dyno before driving it more.

RS98GSX · 06-13-2012

What do the rest of your plugs look like? running super lean on a cylinder because of a bad injector? any codes?

**4seasons69** · 06-13-2012

The other 3 plugs are just fine. The injectors are new but I suppose one could have malfunctioned. As for codes the cars a 92 talon and on aem so I don't think it would have any codes

RS98GSX · 06-13-2012

Throw a new set of plugs it and pull of the injector plugs and see if ther is/in'nt a change.

**4seasons69** · 06-13-2012

Yeah I'm going to get my hands on a bore scope and check out the inside of the cylinder for any damage. I'll just hope for the best and go from there.

RS98GSX · 06-13-2012

Good idea, keep us updated.

**asshanson** · 06-13-2012

Do a compression check to see if all your valves are still good.

**4seasons69** · 06-13-2012

Well got in there with a bore scope tonight and there's a nice hole melted in the top of the piston. So I'm going to assume the cylinder Head and valves look about the same as the piston and spark plug

1999Gst · 06-13-2012

Quote:

Originally Posted by 4seasons69

Well got in there with a bore scope tonight and there's a nice hole melted in the top of the piston. So I'm going to assume the cylinder Head and valves look about the same as the piston and spark plug

Damn sorry to here. wonder how it happened?

**4seasons69** · 06-14-2012

Quote:

Originally Posted by 1999Gst

Damn sorry to here. wonder how it happened?

Yeah I don't know why it happened that's what I want to figure out. I'm thinking an injector malfunction or something but really don't know at this point

**JET** · 06-14-2012

Mislabeled injector and one was smaller than the others possibly? Do they have numbers on them? I thought it looked like detonation, sucks man.

**4seasons69** · 06-14-2012

Quote:

Originally Posted by JET

Mislabeled injector and one was smaller than the others possibly? Do they have numbers on them? I thought it looked like detonation, sucks man.

That's a possibility. I want to have them bench tested. But they are brand new fic 2150s

**goodhart** · 06-14-2012

Ravenworks in maple grove tests/cleans injectors.

**4seasons69** · 06-14-2012

Quote:

Originally Posted by goodhart

Ravenworks in maple grove tests/cleans injectors.

Ok thanks!

RS98GSX · 06-14-2012

That sucks man. I am in the same boat. just did a comp. test last night 155 30 141 152. If you were closer I would say lets wrench together. Good luck.

**4seasons69** · 06-14-2012

Quote:

Originally Posted by RS98GSX

That sucks man. I am in the same boat. just did a comp. test last night 155 30 141 152. If you were closer I would say lets wrench together. Good luck.

That sucks man! Yeah if we were closer I'd agree lol

**Shane@DBPerformance** · 06-14-2012

Is this Swifty's old car? That cylinder might have been running really lean with the fuel pressure/fuel supply problem we were having and/or the problem got even worse.

The melted plug and hole in a piston is pre-ignition though. Pre-ignition destroys a motor extremely fast, it can do that to a piston in a couple seconds.

**4seasons69** · 06-14-2012

Quote:

Originally Posted by Shane@DBPerformance

Is this Swifty's old car? That cylinder might have been running really lean with the fuel pressure/fuel supply problem we were having and/or the problem got even worse.

The melted plug and hole in a piston is pre-ignition though. Pre-ignition destroys a motor extremely fast, it can do that to a piston in a couple seconds.

Yes this is swiftys old car. Yeah i dont know the alternator completely went out on my way home from your shop so I put a new one in it Friday afternoon. I probably put on.. 100-200 easy miles on It after the alternator keeping an eye on The voltage gauge on the turbo timer and never noticed any voltage drop. Then I was moving it from my work cruising along fine then wham it ran like crap for a couple seconds then died