compression
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compression
this time it,s a problem with my son,s 94 ranger 3 l. he has always had some problem with an idle problem ,but a new problem has just started. he tells me that about 2 weeks ago the engine developed a severe lack of power and was running like garbage. he took it into a shop and they did a compression test and told him that one bank was 150 across the board while the other bank was at 90 for all 3. the chain and head gaskets were replaced a year ago so i doubt if they are any of the problem. i could see a burnt valve , but not on all 3 cyl. and all the same. he will be bringing it to me tomorrow and i will start with the basics. the power loss couuld be a bad catalytic convertor but i don,t see how it could affect the compression any ideas sam
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From: Salt Lake City, Utah
Ok, the power loss would not be a cat, because any problem related to a bad cat on a '94 3.0L will affect both banks equally.
I would suspect a blown head gasket is the most likely culprit. Did they replace the head bolts when they replaced the gasket? If not, the bolts have likely stretched.
I would suspect a blown head gasket is the most likely culprit. Did they replace the head bolts when they replaced the gasket? If not, the bolts have likely stretched.
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i agree with you on the cat ,but i find that the possibility of all head bolts on one side stretching the same amount to give the same compression a bit remote but is certainely something that can,t be ruled out. in any case it will be up here tomorrow and i will let you know what i find, but in the meantime any help ,suggestions etc. are appreciated as i have not run into anything like this before sam
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well got it in the garage today. i first took it for a drive and it ran like a pile of manure with almost no power. ,but no whitw exhaust smoke or rotten egg smell. got it home and checken 2 cyl on each side and all at 145,so much for the garage that nailed him for $150.00. warmed it up and found the following 1/no codes 2/vacumn slightly on the low side 3/ no abnormal spark plug signs other than one bank more white tan normal 4/oil pressure on the low side 6/ one or two lifters banging like crazy 7/when reved up it takes quite a while to return to idle once accelerator is released 8/when reved up although not verified yet it sounds like it it may be popping through the intake 9/ catalytic does not get overly hot i realize that an exhaust not opening could cause the popping but i can not relate it to the other symtome help sam
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From: Ishpeming Mi.
Not to sound funny, but have you checked that your air intake is clear all the way back to your air airfilter? I had a similar prob on my old 86 Ranger and it almost got the wife and I killed. I went to pass some old tourist and there was NO power. Turns out that some bloody 'bushbugs' [either chipmunks or Red squirrels] had nested in my airfilter overnight. The lifters banging could possibly be from debris from their antics.
Just something to check.
Just something to check.
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i did check the intake and it,s clear. new rod and main bearings were put in a year ago as well as a new oil pump. oil pressure before this started [about 2 weeks ago] was 50 cold and 25 hot but now sit at 25 cold and 10 hot with a mechanical guage. in any case i will go back at it tomorrow and will keep you posted but if anyone comes up with anything please forward sam
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I would start with the basics. Make sure plugs/wires in good shape. Check cam timing, ignition timing, etc. Remove the valve covers and check the valve springs. The rattling could be from breakage of the springs, or excessive wear on parts. Even tho this engine has a chain, this sounds like a timing issue to me. It could have jumped a tooth, been installed a tooth off, etc. jd
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well jd i do agree but the new chain and gear were put in about 1 yr. ago and ran fine until 2 weeks ago and the compression if it did jump a tooth would be lower than 145-150 psi. but that is not to say that the distributer has not moved and i am going out now to put the light on it . i will let you know what i find sam
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timing is bang on but i am going to pull valve covers tomorrowand see what, going on. has anyone had problems with the camshaft in the 3 l engine because i am at a loss for the drop in oil pressure or will a collapsed lifter aloww oil to lose pressure. i do find now that it develops the pressure slower than before i will keep you posted sam
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finally got back to it and pulled the intake off and found 1 collapsed lifter. while pulling the lifters out to inspect i happened to just see a glimpse of metal beside one of the lobes and after screwing around for a while i finally hookede it and got it out and it appears to be the remains of a cam bearing that had worked its way out and got smashed by the lobes [about 3/8 in wide and about 4in long] i realize that the engine will have to come out for replacement but does anyone know if the crank has to come out also. sam
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found a god used one but the problem is that the donor is a 93 ranger with a standard tranny while mine is a 93 with an automatic and am wondering what problems to lok forward to assuming they are compatable at all thanks sam