need engine advise
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Joined: Mar 2008
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need engine advise
i have a 1994 ranger with 2.3 4 cyl. auto. engine was running poor at idle and at low rpm like when in overdrive, did not have enough power to maintain speed.gas mileage went down to about 8-10 mpg.seemed to run smooth when accelerating or at higher rpm.took to a shop they tested compression-- #2 cyl.35psi 1 3 and4 cyl all around 120psi. also spark plugs in #2 totally burned up, electrode completely incinerated. i have now removed the head and what i see is that the # 2 cyl. is totaly coated with oil deposits everything is black, top of piston, valves, and so on. all the other cylinders are white looking. besides color all the pistons look the same i see no obvious damage same with the valves and valve springs and everything on top of the head looks o.k. the head is at a machine shop today, they are going to look it over and let me know. so here is my question-- does just my head gasket need to be replaced, or do i have ring damage to # 2 piston, or was my problem in the valve train?
Senior User
Joined: Dec 2005
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From: Beaver, Pennsylvania
You probably have a burnt exhaust valve in that cylinder and the machine shop will find it. Being there was low compression in #2 cyl, the fuel was not getting burnrd properly thus the black sooty deposits.
I would wait to hear from the machine shop about the head, though I would put my money on a burnt valve.
I would wait to hear from the machine shop about the head, though I would put my money on a burnt valve.
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pablo, i had a compression test done, and it showed that #2 cylinder was low. the other cylinders tested o.k. what would that tell you?
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Post Fiend
Joined: Oct 2005
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From: Kiev, Ukraine
first of all, till your truck runs drive to local parts shop and get upper and lower gasket kits.
Then remove valve cover and turning engine with hands look how valves on cyl#3 moves. stuck lifter may cause compression problem too.
If all look well, it is time to remove head. I think you know how to do it and how to inspect cylinder head.
If head is OK turn engine to have #3 piston in lower position and inspect sleave for damage.
How to draine oil and remove oil pan I think you know.....
Then remove valve cover and turning engine with hands look how valves on cyl#3 moves. stuck lifter may cause compression problem too.
If all look well, it is time to remove head. I think you know how to do it and how to inspect cylinder head.
If head is OK turn engine to have #3 piston in lower position and inspect sleave for damage.
How to draine oil and remove oil pan I think you know.....
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Well it is a litle late now to do the trouble shooting. Normally if you have low compression a cylinder you squirt some oil in that cylinder and run the compression test again if the compression comes up it is bad rings if it doesn't is bad a bad valve.
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so, i finally heard back from the shop, they told me that both the intake and exhaust valves were bad on #2 cylinder. i am having them put all new valves in , then im gonna put it back on the truck and hope all runs good.
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