Join Date: Sep 2011
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Re: Why does my diesel not rev when in gear?
"but got progressively worse last summer" "Replaced the exhaust elbow/water muffler last summer"
Check the exhaust since issues started when you put the new exhaust bits on. Did the exhaust installer check the back pressure after installation? Blocked exhaust causes excess soot which fouls the exhaust more.
If it has a glow plug check its working.