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Lit like a BranchDavidian
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Discussion Starter #1
So my car suffered a horrid blown motor last year that eventually ended up causing a engine bay fire. That was last november. I finally got the car back from getting the motor replaced at the end of July. What a craptastic time that was.

So, about 2 weeks ago, the DFMM for the JRSC took a dump on me. Something went wrong and it decided to run the injectors wide open. Luckily i was about 3 mi from my hosue and got the car home safely. Diagnosed it as the fuel box adn removed it. Car ran fine, as long as i stayed out of boost when i made sure i did (not very hard at higher rpm's). Well, about a week ago the car was runnign richer and richer upon start up and i had a CEL for a P1170 (mfg. air fuel control device or something like that)aka bad O2 sensor. So i bought a O2 and installed it. Crank up the car....and now it sounds like a WRX again.Great.

Pull the sparkplugs and cyl#4 is covered in oil, look in the cyl and see oil on top of the piston. Checked the dipstick and no contamination in the oil... so its not a headgasket. I had been so carefuul with this motor too, checking the oil everytime i put gas in, kept the BTC at full retard, didnt bang on the car until it was nice and warmed up..sheesh. I did notice that when i got the car back the vaccum at idle wasn't right, it was reading just under 10 instead of the normal 20. We had checked all over for ANY vaccum leaks but there were none, im suspecting that the timing was set too far back (so i was todl that too much retard when setting the t-belt would cause a low vaccum reading at idle)

So yeah, i dont know what the &^%&*% happened. Running fine one day, replace a O2 and BLAM! oil in the piston. The block i bough to replace the old motor had sat for over a year, but the shop (i assume) who put the block in, properly primed the newer block after it had sat for so long. I'm highly suspicous that the rings weren't in good shape and gradually went out and driving in boost was doign them good until i stopped boosting...then they went...

I think she is cursed....
 

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I am sorry to hear that man. Just buy another block and drop it in there.
You can knock it out quick. Make the people that have stickers all over your car buy it for you ;)

Good luck man,
Jeff
 

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Lit like a BranchDavidian
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5,990 Posts
Discussion Starter #6
well... it seems all the car needed was an Italian Tune-up !!!

I got a new DFMM today in the mail and decided to put it on the car and see if i could now go back into boost even on a blown motor... it could still get me around to a job or soemthing, ya know?

So i put the DFMM and new pressure switch on and let the car warm up and take her out. Well, i pull out of my neighborhood and the car is still very much down on power, misfiring and blowing smoke... so i decide to boost. I saw the boost gauge spike to 8psi, with the car still sounding like a WRX and blowing smoke like mad..and popping flames when i let off the throttle. Damn. Oh well. Well maybe some Lucas Oil stabilizer migh thelp?? There was a ticking noise upon cold start up...which was not nice to hear.

So i go to autozone and get some Lucas and run over to the gas station and fill up. I make it about 200yds and the car popps a couple times and takes off on me. I let off the gas and theres no more misfire!!!!! I roll into the throttle again and it picks up liek a scalded dog...wtf??? I didnt even get a chane to put the lucas in! :D Well i drove the car about 10 more miles and it idles fine and runs great..

I always knew the Miatas were meant for boost... i took the boost away and she got mad and protested lol. *crosses fingers she keeps running good*
 

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maybe the gas station sold you a crappy batch of petrol.. my freinds M3 went ino limp mode after he filled up with premium.. must have been somthing in the gas pump?
 

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Lit like a BranchDavidian
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5,990 Posts
Discussion Starter #8
maybe... but why would there have been oil on the sparkplug?? I checked after i got home and no more oil.... strange.
 

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Lit like a BranchDavidian
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5,990 Posts
Discussion Starter #11
nah.. there was NO oil in the sparkplug hole/valley. Someone on .net said this too. And theres no way it elaked thought in 4-5 days...but even then there would be residiual on the plug/plug wire.

Maybe i had a bad valve guide?? maybe.

I drained and filled the oil and put some lucas stabilizer in there....running all good still.
 

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PCV valve going bad? Sucking in air from the cam cover and into the engine?
 
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