Single Cylinder Misfire - intake valve spring
#13
Thank you very much, Oldblue. I bought both Seafoam Spray and Seafoam motor treatment just now. But would like to wait for your or donbrew's recommendation on which one to be used. Both says cleaning up carbons deposits.
#14
I retested following the donbrew's post but it still showed the same result: #1, 2, 4 - 210 psi #3, 90psi (jumps up to 150psi after adding engine oil). To avoid my personal fault, my friend checked each steps I did. We retested #1,2,4 twice, each time got 210 psi with two gauges (one was loaned from Autozone, the other was owned by myself).
Ignore the gauge absolute measurement, #1,2,4 have the same pressure values while #3 has much lower one.
Ignore the gauge absolute measurement, #1,2,4 have the same pressure values while #3 has much lower one.
#20
Update:
I saw all the seafoam was soaked this morning. Then I put everything back and started the car, saw little bit smoke (not too much). After idling a little while (5-7 minutes), the engine code P0303 came back again. I cleaned up the code and started driving. During the driving, when the speed was low, the code came back again. I will drive one day and do the oil change tomorrow.
I saw all the seafoam was soaked this morning. Then I put everything back and started the car, saw little bit smoke (not too much). After idling a little while (5-7 minutes), the engine code P0303 came back again. I cleaned up the code and started driving. During the driving, when the speed was low, the code came back again. I will drive one day and do the oil change tomorrow.