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1987 Ford Escort GT


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02-19-04, 10:41 AM   #1  
DRLM001
1987 Ford Escort GT

Hi,I have a 87 escort gt 1.9 ho with apx 151000kI just replaced the battery,altenator,plugs.But my problem is after the car has been driven for apx an hour and then sits running the RPM's go from normally just above1000 rpm to around 800 or so.But when this happens the oil light comes on usually dim,but if the idle goes up or i give it gas it goes out.It doesnt come on at any driving speeds or when it hasnt been running.The car isnt burning any oil,its full.It could probally be changed though.And it seems to be running fine.Any ideas?Thanks.

 
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02-19-04, 11:01 AM   #2  
I can't tell you why the idle speed changes. But the oil pressure is most likely low due to wear on a 150,000 mile engine. What happens is the oil pressure drops slightly when the engine slows down which allows the oil light to start to come on. When you speed the engine up the light will go out as the oil pressure goes up. If you had an oil pressure guage you could watch the pressure change. This is not uncommon in a higher mileage vehicle.

An oil change may help particularly if the oil has been in there long enough to start losing some of it's viscosity. You could change to a heaver weight oil but I would not go much higher than the owner's maunal recomends.

 
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02-19-04, 12:14 PM   #3  
Sounds like it may be time for a new oil pump. Have it checked with a manual gauge first though. The pick up screen could be plugged also.

 
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02-19-04, 05:02 PM   #4  
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it may help you in some higher mileage cars i work on i use an oil additive called "lucas oil additive" many people says it works and they notice a little improvement in fuel mileage and oil consumption is lowered.

 
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02-19-04, 05:28 PM   #5  
Originally posted by robertbaker816
it may help you in some higher mileage cars i work on i use an oil additive called "lucas oil additive" many people says it works and they notice a little improvement in fuel mileage and oil consumption is lowered.
There is no such thing as "mechanic in a can". Disguising the symptoms does not improve lubrication. If the oil pump can no longer supply enough oil volume and pressure, it has to be changed. Nothing in a can can correct that.

 
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02-19-04, 05:36 PM   #6  
mike from nj
the proper repair is to replace parts, but i have kept the 'flickering oil light at idle' off by using heavier oil before(20w-50). thinner oil is needed for tight bearing clearances, you don't have that anymore.

once parts start to wear out, they wear at a quicker rate, so this would be a temporary repair at best.

 
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02-19-04, 05:43 PM   #7  
Originally posted by mike from nj
the proper repair is to replace parts, but i have kept the 'flickering oil light at idle' off by using heavier oil before(20w-50). thinner oil is needed for tight bearing clearances, you don't have that anymore.

once parts start to wear out, they wear at a quicker rate, so this would be a temporary repair at best.
That may put the light out and disguise the problem but I doubt it will get lubrication to the places it needs to in the short time it's supposed to, leading to a lot of unecessary wear. It's more of a disguise than a repair.

 
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