1996 Misfire, Stumbling, and Knocking
Car is a 1996 Disco I. Has around 130k miles on the clock. Being an avid hunter and just in general enjoying the outdoors, I have to get this truck back into perfect running order. The reason is because I have to get lots of gear into places that a regular car cannot go.
My current problem is this, and has yet to be answered. I have talked to mike on the phone awhile back and tried everything he said and it didn't work. And I don't blame mike at all, its hard to diagnose on the phone lol.
The car has a bad constant misfire on the number 5 and 7 cylinder. I have changed the injectors (they were bad anyway and leaking), new spark plugs, 8mm wires. That changed nothing. It has been stumbling 50-55mph like it doesn't want to go and then it evens out after you get above 50. It also had a barely noticeable knock under load for awhile. Lately it has started knocking constantly. So I took it to a mechanic who actually works on Rovers some. He said it was a lower or upper lifter (never heard of these, I'm guessing with others help, he was talking about a lower rocker arm and push rod?) and these lifter's had become bent. Following this logic, this would explain my misfire because one of the valves would be constantly open allowing a misfire.
Can anybody else confirm or deny this theory I have? Its pretty much the only theory I have that can tie all the problems together. I have not found any metal flakes, or shavings in the oil yet, so I figured it wasn't a spun bearing.
I plan on seafoaming the car as a last ditch effort this weekend before I pull the engine apart. Can anybody point me to any other help besides the Rave manual, which I have and have been looking over?
Also can anybody confirm or bring to light any other ideas on this misfire?
Thanks,
Brian
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