Single Cylinder Misfire - intake valve spring
02-20-2018, 09:10 PM
#42
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Maybe. Maybe not.
Can you actually feel the misfire or just get a CEL when it happens ?
If that 1 cylinder is low and the CEL is always P0303, then I would say the misfire is continuous. Even if you and/or the car only see it randomly, I will bet that misfire is always happening.
FYI. 174-178 coolant temp on the highway is too low. Thermostat is sticking open or someone replaced it with the wrong one.
Can you actually feel the misfire or just get a CEL when it happens ?
If that 1 cylinder is low and the CEL is always P0303, then I would say the misfire is continuous. Even if you and/or the car only see it randomly, I will bet that misfire is always happening.
FYI. 174-178 coolant temp on the highway is too low. Thermostat is sticking open or someone replaced it with the wrong one.
Today I drove many local, the average temperature of the coolant was aroubd 190-210. I guess I shall check the Thermostat? I don't quite follow the relationship between the misfire here and the Thermostat.
02-20-2018, 09:32 PM
#43
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02-20-2018, 09:34 PM
#44
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02-21-2018, 08:25 AM
#46
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Not sure, maybe the blower fan?
I will try Engine Restore to see if that could somehow improve the compression. I totally put the seafoam into the spark plug holes four or five times, the first two, I got the engine running smoother, obviously observable. And the misfire happened less. But now, it is more frequently even than before. I saw the ad of Rislone. Wondering if anyone here used it before.
02-21-2018, 08:34 AM
#47
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If the Seafoam hasn't cured it, don't waste the time with Engine Restore. They work on the same principle of cleaning deposits and freeing stuck parts such as piston rings.
You're at the point now of needing to do a leak down test.
You're at the point now of needing to do a leak down test.
02-21-2018, 10:22 AM
#48
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Seafoam is a different product than Engine Restore:
RESTORE Engine Restorer & Lubricant is a high performance oil additive that increases compression in older high-mileage engines. The unique CSL formula fills in worn areas of the cylinder walls to reduce blow-by and RESTORE compression to near original levels. Restoring cylinder compression improves combustion to increase horsepower, reduce oil burning, maximize fuel mileage and RESTORE peak engine performance. In addition, it provides extreme pressure lubrication to help protect engine components from excessive wear. Compatible with conventional or synthetic oil.
Will it really help? You have nothing to loose at this point.
YouTube does have videos about it.
RESTORE Engine Restorer & Lubricant is a high performance oil additive that increases compression in older high-mileage engines. The unique CSL formula fills in worn areas of the cylinder walls to reduce blow-by and RESTORE compression to near original levels. Restoring cylinder compression improves combustion to increase horsepower, reduce oil burning, maximize fuel mileage and RESTORE peak engine performance. In addition, it provides extreme pressure lubrication to help protect engine components from excessive wear. Compatible with conventional or synthetic oil.
Will it really help? You have nothing to loose at this point.
YouTube does have videos about it.
02-21-2018, 07:41 PM
#50
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