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Car Forum / Toyota / Toyota Trucks / March 20061994 Toyota 4x4 develops miss after warm up
I recently installed a new/rebuilt long block into my 1994 Toyota 4x4 pickup. During the install I encountered a problem where I was getting a large amount of water in the oil pan. The problem was an alignment pin on the timing cover...I had two in one hole. I repaired the leak and been driving it to work for the past week. At initial start-up and during 95% of the drive (25 min highway drive) I experience no problems. When I park and let the truck drop to idle speed there is a miss. I have noticed it at a stop light after about 20 min worth of driving. It does the same thing on the way home starts fine idles fine during the first part of my trip, but once i make it home the miss is back. Any ideas? Could it be related to residual water in the oil from the initial leak? Spark plug wires (the only part i didn't replace during the install of the rebuilt longblock)? Could the valves need adjusting? >I recently installed a new/rebuilt long block into my 1994 Toyota 4x4 > pickup. During the install I encountered a problem where I was getting [quoted text clipped - 12 lines] > initial leak? Spark plug wires (the only part i didn't replace during > the install of the rebuilt longblock)? Could the valves need adjusting? It shouldn't be caused by the water leak but you should have changed the oil if it had water in it.If you haven't already changed the oil, do it NOW. Water in the oil can cause bearing damage, coolant in the water will speed up the process. Spark plug wires should cause a miss under load, not at idle. If the valves were not adjusted properly ( too tight ) it could cause the symptoms you describe. I would recheck the valve adjustment. Did you have this problem before the engine swap ? <I would recheck the valve adjustment. Did you <have this problem before the engine swap ? I did not own the truck before the rebuilt engine was installed, so I am unsure about the history. I can find out though and that is a good point. <If you haven't already changed the oil, do it NOW. I drained the oil immediately after finding the leak. I also cleaned off the head before filling the oilpan again. I ran the new oil about 120 miles and changed it again. I am going to run this oil about 500 before the next change. < I would recheck the valve adjustment. Do you think it would hurt to wait until the 500 mile mark. I can retorque and check the valve adjustments at the same time. > <I would recheck the valve adjustment. Did you > <have this problem before the engine swap ? [quoted text clipped - 14 lines] > Do you think it would hurt to wait until the 500 mile mark. I can > retorque and check the valve adjustments at the same time. It might not hurt to wait but if you are having problems it might be a good idea to check them sooner. < It might not hurt to wait but if you are having problems it might be a >good idea to check them sooner. I am bringing the core back to the machine/rebuild shop in the morning. I will run it by them and see what they have to say about it. Thanks for the tips. I will post my results. R/ Brad Could a bad knock sensor cause this type of problem. Mine is broken off. I have one on order. I have no clue what the knock sensor does except for make my check engine light come on. Refresh... ****** At initial start-up and during 95% of the drive (25 min highway drive) I experience no problems. When I park and let the truck drop to idle speed there is a miss. I have noticed it at a stop light after about 20 min worth of driving. It does the same thing on the way home starts fine idles fine during the first part of my trip, but once i make it home the miss is back ******* I have put close to 500 miles on the new engine. The miss seems to be getting less and less noticable, but is still there. I replaced the broken knock sensor, so I have no check engine light any more. Also I talked to the machine shop that rebuilt my engine and was told there was no need to check the valve clearance or retorque the head bolts.... |
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