Update: Pulled the head, pics on page 2
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Hmm, ok so I was driving around tonight,
and my cel came on. I pulled over and checked it, it said code 10,
didnt know off the top of my head what that was but I remembered it might be the o2 sensor..

So anyways the car was driving just fine, had a cel but felt great..
so I'm driving home and I forgot about the cel.
Was going pretty fast, like 120 and my engine cuts off

I coast off the freeway and pull over, pop the hood, it smells alittle odd,
like burning something(maybe plastic or rubber..) but visually nothing wrong,
no leaks or anything.
coolant overflow is at its usual level.
no signs of smoke.

I start it back up and it takes a while to start up and runs REAL rough,
sounds NASTY, like as if it has a huge cam or something, but it runs.
so I creep home real careful.
I check out the exhaust and no smoke whatsoever, its clean..

check the CEL again, still code 10..

and thats where i'm at right now.
I'll check my plugs, coolant, various fluids and peer into the cylinders tomorrow.
i'll also do a compression test.

But for now i'm curious if you guys have any input on this?
one thing of note, is that i'm running a jackson racing map controller,
which taps into the IAT line to do some sort of tricking of the ecu to get more fuel.

anyhoo heres my setup
jdm d15b(stock)
jrsc, stock boost levels
jr fmu and map controller for fuel
(i/e).
thnx.


Modified by Tad at 3:21 PM 2/16/2005

 

Code 10 is IAT Malfunction code. It sounds like your map controller is messing with the signal. I would take it off since your fmu is giving the extra fuel.

 

ehh, just found what the original cel was from.
one of the IAT wires broke off..

but that was before the car died..
so i'm wondering what damage running on no iat would/could cause...

 

Well this doesnt look good..

compression test results:
1 190
2 180
3 40
4 175

and the plug from cyl #3

 

Have you tried adding oil to the cylinder and see if the numbers come up?

 

I was going to say...the 'huge cam' sound probably means something bad internally...the compression test shows what's up. Highway pulls stress the engine pretty bad...and I think this is where most people blow their engines. Do a leakdown test to find out where you're losing compression, or just tear it down.

 

no I haven't.
i'm curious, what's the point of that?

also you may or may not be able to tell from that pic,
but that plug is shattered, and has oil on it..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tad &raquo;</TD></TR><TR><TD CLASS="quote">no I haven't.
i'm curious, what's the point of that?

also you may or may not be able to tell from that pic,
but that plug is shattered, and has oil on it.. </TD></TR></TABLE>

Yeah, shattered groundstrap leads me to think of detonation. The oil in the cylinder trick can show if it's rings/ringlands that are bad. The oil essentially seals the rings and yields a higher compression test if the rings/ringlands are bad. It's often referred to as a 'wet' compression test as opposed to a 'dry' compression test.

 

about how much oil would you add to the cyl before comp testing it?

 

a capful from the bottle of oil.

 

gotcha,
well i might try that out,
but there doesn't seem to be much point..

I mean bottom line is the engine's blown either way.

 

Sorry to hear that...

If the end of your spark plug broke off like that in the cylinder then chances are you are going to have some internal damage...

Your compression test showed a dramatic loss in #3, doing a wet compression test may bump it up a bit but I have a hard time believing it will bump it up to match the other cylinders...

It doesn't sound like the motor is beyond repair though, it might not cost you much to fix it...

Good luck...

 

big cam sound = broken ringlands
rip that thing apart and find out

 

well it still drives so I can't rip apart just yet.

 

yah you can drive on broken ringlands. depends how bad they are. but your cylinder wall may be chewed up pretty good when you do tear it down.

 

tomi! damn man its been a long *** time!

anyway, after i read your pm and the first post i was gonna reply to you not to worry and to check out the simple stuff first. i read the compression results and wow, i do agree with ya and think a new longblock is in call.

sorrie for the loss!!

there of course has to be good news, and thats the fact that d15b's dont cost much

i'll pm ya the rest. good luck!! clean hatch!!!

 

sorry to hear man .....pull those pistons out.

 

Yea, I don't know how many times I see motors blown up after a 110+ MPH pull, save it for the track.. (had to)

But anyway, good luck fixing that beast.

 

My understanding with conern to JRSC's is that IAT's get ridiculously high during long stints at WOT. Sounds like you had a nice WOT blast to 120mph and thing just got a little too hot in there, *ping* *ping* *BOOM*

Well, at least you have reason to build

 

I am sure it has something to do with your iat wire falling off like you metioned in the hmt thread.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tad &raquo;</TD></TR><TR><TD CLASS="quote">ehh, just found what the original cel was from.
one of the IAT wires broke off..

but that was before the car died..
so i'm wondering what damage running on no iat would/could cause...</TD></TR></TABLE>

and just like on honda-tech too.

 

hehe, lets not have a hmt vs hondatech battle plz

But yeah he's right, that wire falling off was the culprit (well that and my driving).

I really want to pull that head off and see whats goin on in there!

 

yea, when you pull it off, snap some pictures. Some other people can then put in their $.02

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DaX &raquo;</TD></TR><TR><TD CLASS="quote">Yeah, shattered groundstrap leads me to think of detonation.</TD></TR></TABLE>

It also looks like there is some pitting on the porcelin part which also means detonation..

 

Update:
I just poured some oil into the #3 cyl,
and re-did the comp test.. it was 120psi

thats a jump from 40psi to 120psi by just adding oil

so definetely some effed rings eh?

I think I should get to work at pulling that head off now..