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I decided to double check on the timing marks but I notice another mark on the chain which I'm not sure where this chain mark needs to be the only marks on the Sprocket are the dots are lined up with the cam and crank. any idea where this chain mark need to be or its doesn't matter where this...

It got worse and worse hopefully someone here had this familiar issue that could help me. I'm trying to fix this rough cold start issue, low engine RPM-500 it will do it again on the next day when engine is cold once engine warms up it goes back to normal RPM-1000. First thing first I tested...

My truck is a explorer 1991 sport 4.0 ohv I have reset the computer and cleared the codes many times and I'm still getting this code 16 - RPM to low to perform o2 sensor/fuel test. I have replaced my o2 sensor 2 months ago with little miles on them, Anybody knows what I can do to fix it? Thanks.

does anyone know a fuel rail regulator adapter that can fit on my 4.0ohv? couldn't find anything that could fit on the rail. :salute:

Hai! I have a Ford explorer 1991 sport 4.0l v6. Last 2 months I took the engine out to work on the rusty engine bay and engine maintain also did a lot of cleaning inside the engine,, last week I went on put everything back together first thing the engine started with no problem idle good then...

Hai! My name is Chris and I'm from Hawaii. Recently brought this cheap lifted 1991 ford explorer, she was sitting on my friend shop for 5 years everything run great and only couple of parts needed to get repair. :D Edit: 500k Miles??? right these trucks don't have a 6 digit odometer...