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Ranger/Bronco II Mazda B-Series

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  #1  
Old 11-29-2017, 08:40 PM
racsan's Avatar
racsan racsan is offline
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lost compression on 2 cylinders

I have a really strange issue with my '94 2.3 (the junkyard dog truck) yesterday was running fine, i stop at the bank after work for maybe 5 min, shut it off while i was there, went to leave and its missing bad, didnt think much of it, once in a while when starting it would miss but straighten out, figured it was a fault fuel injector, it is a 94, 145K miles on it. well anyways, i went to the dmv then the house, still missing bad, got worse the more it ran. this morning, same thing, drove it 5 miles to work, can barely pull itself, 4.10 gears and the most it will do is 45, 4rth gear, will idle but horribly. work my 8 then before i leave i check things over, nothing seems wrong, oil level and coolant level fine. drove it home, about halfway its smoking alot, i pull over and pop the hood, can see its oily around the #3 manifold port on exhause and its smoking from where the manifold joins the downpipe (i knew it was leaking there before) i get it to the house, pull plugs for a compression test, i had done a compression test when i first got the truck in july, it was roughly 150/160 across all 4. well now i have 160 on 1, 155 on 2, 20 on 3 and 5 on 4. so yes, 2 dead cylinders, my thought is blown head gasket between cylinders (havent pulled head yet) but theres one thing yet puzzling me. after the engine cooled down i checked fluid levels. coolant fine, oil down to the add mark..... yes, i lost a qt of oil i under 5 miles of driving. i did notice oil pressure guage acting weird during driving, it would dip halfway down then go back up. almost acted like a bad connection it was moving so much back and forth. motor sounded like it was "hammering" while driving too. i took a couple of videos, at idle after the drive from work it almost sounds like a diesel. both 3 and 4 plugs were oil soaked, i cant understand why the oil loss/burning is happining. any ideas? yes, i know i have to keep digging and take it apart. but this is just incredibly weird. ran great up until it didnt..... was surprized it lost 2 cylinders. guess that proves that its not always as bad as you think it could be.... sometimes its worse....


this was how it was running before, took about a month ago:
https://www.youtube.com/watch?v=ojaJFKWOJlU

on the drive home today:
https://www.youtube.com/watch?v=tPQgTShRuP4

parked after the drive from work, idleing:
https://www.youtube.com/watch?v=4e2TlGFGxYU

sick....not in a good way....
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1994 2wd 2.3 reg cab long bed. 4.10 gears, hurst shifter,grille guard, cap, old but runs good

pictures--> https://www.flickr.com/photos/154582...h/37156884305/
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  #2  
Old 11-30-2017, 09:44 AM
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dustybumpers dustybumpers is offline
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If the plugs are oil soaked, it's not firing
If they are oil soaked suddenly, and there is a clunking sound while running, you probably broke some rings


Oil pressure changes would be a seperate issue.
Could be something is plugging up the pick up screen
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Old 12-05-2017, 09:08 PM
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I had 2 loose spark plugs the other day ,LOL...make sure that all the
plugs are tight ,they tend to loosen up!....
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Last edited by cbaker65; 12-05-2017 at 09:21 PM.
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  #4  
Old Yesterday, 12:03 AM
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racsan racsan is offline
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well i got it tore down and found head gasket blown between 3 and 4 cyl. and gasket was eroded back clear to the return hole on the head where the oil drains back down from the head to the crankcase. sent head off and they found nearly every valve seat was cracked, someone before me must have gotton this thing really hot. just sent another head off. have checked block and it seems ok. hopefully in another week the ranger will be back on the road.
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1994 2wd 2.3 reg cab long bed. 4.10 gears, hurst shifter,grille guard, cap, old but runs good

pictures--> https://www.flickr.com/photos/154582...h/37156884305/
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  #5  
Old Yesterday, 10:21 AM
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Looking at your pictures. I love the old late 50's emblem on the hood of the ranger.
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  #6  
Old Yesterday, 11:36 AM
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yes, i love that emblem, had been trying to find one of those for awhile now. found that one at a flea market some 30 miles from me, this guy had all sorts of emblems for sale, think he must have went to a junkyard and stripped as many as he could. id love to somehow emboss the tail gate with F O R D like they did back in the day. sure i could use decals but i like the "stamped" look better. ive already removed the blue oval from the tailgate and filled in the alignment holes.
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1994 2wd 2.3 reg cab long bed. 4.10 gears, hurst shifter,grille guard, cap, old but runs good

pictures--> https://www.flickr.com/photos/154582...h/37156884305/
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