Senior Member
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Join Date: Jan 2015
Location: East Mountains, NM
Posts: 1,264
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Senior Member
Join Date: Jan 2015
Location: East Mountains, NM
Posts: 1,264
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That is a great report, i thought. Kudos goes to the mechanic and the service writer.
Remember, even as newbies, we have a lot of love and interest in saving money while DIY fixing our junk. It might be something not too expensive to repair but finding it will take a considerable effort.
I have the heads on my dining room table so let me know if you have questions that I can answer. Visual answers are MoBetta than bunch of words!!
Before anyone wonders, yes, I AM divorced. :-) I also use the dishwasher to wash car parts.
My take: At this time, the valve seats maybe so foulded/dirty that they're not seating perfectly and closing tight. So, the air/fuel mix is seeping into the cylinders and fouling the plugs.
Another thing might be the injectors. Couple of them might be leaking and dripping when they're not suppose to. This is an easy fix but to remove them requires a fair amount of work. The odds of three injectors leaking is quite low but maybe the wiring to them is suspect. While doing my daughter's head gasket project, I'm also cleaning/testing her injectors. Yup, on the dining table!!
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I had to put in spaces in the report to make my brain hurt less.
Technician's Notes: P0300 random misfire, P0301 P0303 P0305, Cylinder 1 3 5 misfire.
Vehicle barely runs, has spark and fuel on the affected cylinders. Checked cam timing since the misfires are confined to one bank, cam timing is good.
Removed the spark plugs and found two wet with fuel and one fuel fouled. Did a compression test and found zero compression from cylinders 3 and 5.
Leak down test indicated a problem with the intake valves. Removed the valve cover to inspect for valvetrain damage, everything looks good, next step would be to remove the cylinder head to inspect for a bent valves or valve seat issues.
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2003 Sport V8 Icon 2" rear, Bilstein 6112 front with 700# king springs, Gibson cat back, Magnaflow cross pipe. OBA, DIY sliders, etc
1996 FZJ80 landcruiser with whole bunch of stuff, including a Turbo.
1997 4Runner SR5 - daughter's ride, slowly getting built up
Last edited by alia176; 01-15-2025 at 03:01 PM.
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