Need Help!!! B234 Odd Cyl. Wall Scarring=Engine Failure??? - The Saab Link Forums

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Old 11-15-2009, 11:40 PM   #1
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Need Help!!! B234 Odd Cyl. Wall Scarring=Engine Failure???

Well after cracking a piston in my t7 9-5, I built a b234 from the crank up...I went to GoldWing for a block Kyle assuered me it was with in Spec and I needed Std bearings and Rings, low mileage t7 head, and solid low mileage f35 trans.

In went:

New rod, main Bearings

Every seal was replaced

New water and oil pump

All timing/balance components were replaced

t5 cams went in new (to me) leak tested head

Re honed then New rings (ring gaps were all with in WIS spec)

New head bolts,t5 head gasket was used to eliminate piston clearance issues

At the same time MAF replace, DI replaced. Upgraded to a Hirsch stage 3 tune to run (came from a Nordic 3)

Babied motor for first 500 miles, Oil during break in was rotella 5w40,
Motor did not use nor leak a drop between changes, Nor any Coolant.

I play a bit in t7suite to watch knock cyl count, Filtered Miss fires, Mreq vs. Mair... and I did up the airmass to the limits of the Tdo4 so it was more than just a stage 3 more like 3+... yea I know not with at least a #6 housing and 18t. I have Walboro 255 w. Deka 60# inj... i use a inj constant of 429 to yeild a Amul of 297-399...Wideband is never over 12.5 wot, will spike to a rich 10ish sometimes at certain RPMs

But I really didn't care about the mitsu dying... I have other plans thanks to Vigge.


I have noticed that the MIFI count has been increasing lately, I had an odd p1303 miscellaneous misfires on cyl 3, then a p0100 the next day. These weren't even CEL DTC so no CEL, they were Fcod in SIDI function,no CEL was triggered, you can convert the Fcod from DEC to HEX or use a tech2.

Really worried about the Falshing CEL (again no DTC was stored I used Fcod in SIDI to find 1303) did a bit of research in WIS and found p0100 can have intermittent misfires as a precursor to MAF failure...so I cleaned the MAF with Elec Safe parts cleaner and put a new open air intake I had on...new plugs, oil change,Fuel injector cleaner...and off to dive to get my boy i went...

So I am driving to get my son today from his mom that lives in DC area, I live in Charlotte NC.

No smoke or oil consumption btw 3k mi oil changes, 12k miles on Motor rebuild to WIS spec.

Going 75mph after about 30 min I shift to 4th to get past one of those left lane riders that never gets over, and it looked like a scene out of Thunder Road, HUGE plume of smoke, I immediately got off the road and rolled to the stop at the top of the exit ramp 40 miles from home...

A friendly guy in a truck towed my car home with a MUddin chain after I ripped the f bumper off, and FMIC and such... Tore into her Deep for 3 hours tonight expecting to find another Catastrophic failure... Plug #3 was the only one with oil on it, in fact smoke was coming our for a few minutes after pulling the plugs, MIFI was on #3, I was sure it was #3 again...that was the piston I cracked on my t7 block...

I only found odd scarring of cyl walls, all rings were in tack????

I have no clue where to begin????

Scarring is evident on all Cyl walls 1,2,3 and 4. 3 is the worst, Scarring is evident on 2 sides of the cyl walls looking at #3 piston it is on both sides of piston too... 12 o'clock and 6'oclock position Cross hatching is destroyed and I am assuming this is where compression is lost...please help

PLEASE Help, I will rebuild again ... but whats the Deal... ?

Will Upload Photos As soon as my neighbors Internet picks up...yea I am that broke and still paying off motor build from the summer


http://s127.photobucket.com/albums/p...20not%20Again/

Last edited by WPressly; 11-15-2009 at 11:43 PM.
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Old 11-16-2009, 04:47 AM   #2
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the pic link is not working. nothing much is can say with that description. was the rod ok on cyl 3 ? how about the head, were the valve retainers in good shape ? how did the head casket look like ?
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Old 11-16-2009, 05:12 AM   #3
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bad injector or possibly a bad DI would be my guess. I'd Do a fuel volume & pressure test at the fuel rail to make sure you are good there, and take the injectors somewhere they can be cleaned / tested. I'd also suggest you swap the DI for a new unit since you are putting this amount of work into it.
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Old 11-16-2009, 08:26 AM   #4
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well DI doesn't make sense if he replaced the MAF and DI...
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Old 11-16-2009, 09:09 AM   #5
 
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Scarring is evident on all Cyl walls 1,2,3 and 4. 3 is the worst, Scarring is evident on 2 sides of the cyl walls looking at #3 piston it is on both sides of piston too... 12 o'clock and 6'oclock position Cross hatching is destroyed and I am assuming this is where compression is lost...please help
Weird......It doesn't sound like A/F is your issue. Those marks low in the cylinder then extending upward are the signs of scuffed pistons, which usually happens when the piston skirt overheats and expands against the side of the cylinder walls. Same thing happened to my B234R when it blew an oil cooler hose and lost 3-4 qts of oil.

I'm assuming you used the same 9-5 pan, but did you clear the pickup screen before installing it? (This is a perfect candidate for the extra-perforated pickup screen technique: poke 6-8 holes through the screen with an awl... )
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Old 11-16-2009, 09:57 AM   #6
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my old snowmobile did this the cyl looked exactly the same, shop claimed it was cold siezed...or that the piston heated faster then the block
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