dgk1 Posted August 24, 2011 Share Posted August 24, 2011 i have a 2000 cx613 with a 427. the engine started losing power today and making a loud noise.i had one person say it sounded like a dropped valve so i pulled the valve covers off but i don't see anything wrong in there.what else can i look at? it also shows a 1-1 code now. Quote Link to comment https://www.bigmacktrucks.com/topic/20307-2000-cx-engine-problem/ Share on other sites More sharing options...
rhasler Posted August 25, 2011 Share Posted August 25, 2011 1-1 is an oil pressure fault code. A 2000 model should have step 7 software, so you shouldn't get a code for oil pressure when the key is on and the engine isn't running. Is your oil pressure reading OK? Around 2000 there were a lot of cam problems too. Quote "Mebbe I'm too ugly and stupid to give up!" Link to comment https://www.bigmacktrucks.com/topic/20307-2000-cx-engine-problem/#findComment-84353 Share on other sites More sharing options...
mackdaddy1911a1 Posted August 25, 2011 Share Posted August 25, 2011 Please describe the noise if you can. A dropped valve will be internal but I can't tell you if you'll be able to tell with the valve covers off only. rhasler is right about the cam too...Mack used ceramic cam followers and if you don't run an overhead (adjusting the valves ) every 65 to 75 000 miles it will damage a cam lobe...ask me how I know. Good Luck Quote THE GREATEST NAME IN TRUCKS MACK TRUCKS Link to comment https://www.bigmacktrucks.com/topic/20307-2000-cx-engine-problem/#findComment-84358 Share on other sites More sharing options...
dgk1 Posted August 25, 2011 Author Share Posted August 25, 2011 it is a loud noise like a gun going off inside the engine. sounds like its toward the left front of the motor.i pulled the valve covers off but don't see anything broken or out of the ordinary. Quote Link to comment https://www.bigmacktrucks.com/topic/20307-2000-cx-engine-problem/#findComment-84369 Share on other sites More sharing options...
TOMD Posted September 3, 2011 Share Posted September 3, 2011 is it popping out the intake or exhaust? Quote Tom ~ Parts & Service SpecialistWatt's Mack Sales, Inc. 1-888-304-6225 Link to comment https://www.bigmacktrucks.com/topic/20307-2000-cx-engine-problem/#findComment-84953 Share on other sites More sharing options...
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