Dar Posted January 13, 2020 Share Posted January 13, 2020 Hi guys. I have a 2005 mack vision with an aset engine, been running it on the farm for a couple years. Always thought it was a bit low on power and boost was a bit high but it worked so I just kept driving. This fall however on my way home one night I could not get up to 60mph on the highway. Since then I can only get up to highway speed empty and even then the boost is continually 25-30 psi. Loaded I cannot get up to highway speed and boost rises as high as 33ish psi. There are a few codes present. 9-5. Compressor discharge temp sensor 2-5. Front drive axle temp 2-6. Rear drive axle temp 3-1. Exhaust temp sensor All these codes were present before this new problem came up. Truck is fully serviced including new air filter and fuel filter. As soon as I get to town I will pick up some fittings so I can check the fuel pressure after the fuel lift pump. Also have a sensor coming for the turbo discharge temp code. If you have any suggestions I would be happy to hear. Thanks. I was reading a post from a few years ago of about an 03 model with what seems to be very similar problems. Quote Link to comment Share on other sites More sharing options...
ivanuke Posted January 13, 2020 Share Posted January 13, 2020 (edited) You can download the v-mac III service manual here. https://macktrucks.vg-emedia.com/ProductDetail.aspx?ProductId=6156 Just click the view file hyperlink and it will download, at the end of the manual you will see troubleshooting steps for your codes. As for lack of power i dont have much experience on what may be the issue but anything sensor related can be found in the manual. Edited January 13, 2020 by ivanuke Quote Link to comment Share on other sites More sharing options...
fjh Posted January 13, 2020 Share Posted January 13, 2020 1 hour ago, Dar said: Hi guys. I have a 2005 mack vision with an aset engine, been running it on the farm for a couple years. Always thought it was a bit low on power and boost was a bit high but it worked so I just kept driving. This fall however on my way home one night I could not get up to 60mph on the highway. Since then I can only get up to highway speed empty and even then the boost is continually 25-30 psi. Loaded I cannot get up to highway speed and boost rises as high as 33ish psi. There are a few codes present. 9-5. Compressor discharge temp sensor 2-5. Front drive axle temp 2-6. Rear drive axle temp 3-1. Exhaust temp sensor All these codes were present before this new problem came up. Truck is fully serviced including new air filter and fuel filter. As soon as I get to town I will pick up some fittings so I can check the fuel pressure after the fuel lift pump. Also have a sensor coming for the turbo discharge temp code. If you have any suggestions I would be happy to hear. Thanks. I was reading a post from a few years ago of about an 03 model with what seems to be very similar problems. Compressor discharge temp indicates the hood to air cleaner boot is not sealing sucking in engine compartment heat!!!!!! Fix the boot And see what happens! 1 Quote Link to comment Share on other sites More sharing options...
Dar Posted January 13, 2020 Author Share Posted January 13, 2020 Currently the wires are ripped off right at the sensor. So the sensor will need to be replaced first. Quote Link to comment Share on other sites More sharing options...
JoeH Posted January 13, 2020 Share Posted January 13, 2020 And when did you last change your fuel filters? Quote Link to comment Share on other sites More sharing options...
JoeH Posted January 13, 2020 Share Posted January 13, 2020 (edited) Clogged fuel filter still let's you hit good boost numbers, up until a continually decreasing rpm as the filter becomes more and more clogged. Basically acts like a governor. Edited January 13, 2020 by JoeH Quote Link to comment Share on other sites More sharing options...
Dar Posted January 13, 2020 Author Share Posted January 13, 2020 Fuel filter is brand new. Quote Link to comment Share on other sites More sharing options...
ivanuke Posted January 13, 2020 Share Posted January 13, 2020 37 minutes ago, Dar said: Fuel filter is brand new. Check your tanks, I remember my CHN had similar issue, I changed fuel filter and didnt help. I drained my entire tank both sides and refilled with new diesel, that fixed the issue. Quote Link to comment Share on other sites More sharing options...
880joe Posted January 13, 2020 Share Posted January 13, 2020 Would the variable geometry turbo be stuck in wrong position? Quote Link to comment Share on other sites More sharing options...
Mack Technician Posted January 14, 2020 Share Posted January 14, 2020 Fix sensors and see if derate goes away. 1 Quote Link to comment Share on other sites More sharing options...
Dar Posted January 14, 2020 Author Share Posted January 14, 2020 Thanks guys. My fan clutch locked up the other day which isnt nice when it is -25 Celsius. Should have that back together tomorrow and the turbo temp sensor should be in too. Will see what that does. Quote Link to comment Share on other sites More sharing options...
Dar Posted January 21, 2020 Author Share Posted January 21, 2020 Replaced the fan clutch. Also replaced the visible damaged turbo discharge temp sensor. Code did not go away. Does it need to be cleared with a scan tool? Still have no power. However it is also throwing #2pump code at cold start ups. When it warms up code goes away. Will wait till the fuel tanks get emptier and hopefully drain them. Quote Link to comment Share on other sites More sharing options...
Mack Technician Posted January 21, 2020 Share Posted January 21, 2020 Code should go inactive if it’s fixed. Quote Link to comment Share on other sites More sharing options...
fjh Posted January 21, 2020 Share Posted January 21, 2020 9 hours ago, Dar said: Replaced the fan clutch. Also replaced the visible damaged turbo discharge temp sensor. Code did not go away. Does it need to be cleared with a scan tool? Still have no power. However it is also throwing #2pump code at cold start ups. When it warms up code goes away. Will wait till the fuel tanks get emptier and hopefully drain them. Which code is still active besides the pump code ? Did you confirm the boot is sealing to the hood? 270 code is related to this! Just sayin! Quote Link to comment Share on other sites More sharing options...
Dar Posted January 22, 2020 Author Share Posted January 22, 2020 Yes the boot is sealing to the hood. Besides the pump code when it's cold out I still have the 9-5 code for compressor discharge temp. And 3-1 code for exhaust gas temp. As well as codes for front and rear drive axle temp, obviously not concerned about those codes. As nice as it would be to get rid of these codes I dont think they are the problem here due to the fact that they have all been active for 2 years prior to this problem. Quote Link to comment Share on other sites More sharing options...
fjh Posted January 22, 2020 Share Posted January 22, 2020 10 hours ago, Dar said: Yes the boot is sealing to the hood. Besides the pump code when it's cold out I still have the 9-5 code for compressor discharge temp. And 3-1 code for exhaust gas temp. As well as codes for front and rear drive axle temp, obviously not concerned about those codes. As nice as it would be to get rid of these codes I dont think they are the problem here due to the fact that they have all been active for 2 years prior to this problem. Are you loosing any coolant ? any signs of coolant at the EGR cooler outlet? Quote Link to comment Share on other sites More sharing options...
Dar Posted January 23, 2020 Author Share Posted January 23, 2020 Not loosing any coolant. Checked fuel pressure today after the filter and pump and pressure would not dip below 60psi under load. The #2 pump code remains on all the time now and when I rev the engine to 1800 under no load I can hear the engine start to miss. Think the next step will be to change that fuel pump. Quote Link to comment Share on other sites More sharing options...
Mack Technician Posted January 23, 2020 Share Posted January 23, 2020 Wouldn’t hurt, and it likely needs one anyway. 1 Quote Link to comment Share on other sites More sharing options...
Dar Posted April 8, 2020 Author Share Posted April 8, 2020 Update. Had truck at the shop. They scanned and cleared codes. 9-5 code went away and has not returned. They also checked and pressurized intake system for leaks, checked turbo and actuator operation, and calibrated. Turbo boost is good. Checked fuel pressure. Checked for exhaust restriction. Checked throttle operation. Performed cylinder balance test. They also scanned truck while driving in low power conditions and could not find anything wrong. Everything checks out good. Cannot make the truck smoke in any condition. Still has codes for front and rear axle temperature sensors. And a 3-1 code. Any chance the 3-1 code could cause a derate? Any other ideas? I dont know what to do with this thing. Already bought another truck to get by. But would still like to get it fixed. Quote Link to comment Share on other sites More sharing options...
Dar Posted April 8, 2020 Author Share Posted April 8, 2020 I have been pulling the same trailers, same loads, same roads, only driver, so I know for a fact that it had more power than it does now. Quote Link to comment Share on other sites More sharing options...
fjh Posted April 8, 2020 Share Posted April 8, 2020 So I'm going to throu this out there, If you have a mack trans and you a missing approx half your boost check the torque limit switch at the rear of the trans! if it malfunctions the Vecu will derate with no code as it does not see any malfunction !IT Thinks everything's is AOK! Quote Link to comment Share on other sites More sharing options...
Dar Posted April 8, 2020 Author Share Posted April 8, 2020 It has an Eaton fuller 13 speed. Not familiar with the mack trans. Does does the eaton also utilize this torque limiter switch? Quote Link to comment Share on other sites More sharing options...
Mack Technician Posted April 10, 2020 Share Posted April 10, 2020 (edited) On 4/7/2020 at 8:13 PM, Dar said: Update. Had truck at the shop. They scanned and cleared codes. 9-5 code went away and has not returned. They also checked and pressurized intake system for leaks, checked turbo and actuator operation, and calibrated. Turbo boost is good. Checked fuel pressure. Checked for exhaust restriction. Checked throttle operation. Performed cylinder balance test. They also scanned truck while driving in low power conditions and could not find anything wrong. Everything checks out good. Cannot make the truck smoke in any condition. Still has codes for front and rear axle temperature sensors. And a 3-1 code. Any chance the 3-1 code could cause a derate? Any other ideas? I dont know what to do with this thing. Already bought another truck to get by. But would still like to get it fixed. Don’t think the 3-1 pyrometer code would cause a derate, still would fix it to create a clean slate. You have a dyno in the neighborhood, I’d try to run it on to see what you have? Edited April 10, 2020 by Mack Technician Quote Link to comment Share on other sites More sharing options...
Dar Posted April 11, 2020 Author Share Posted April 11, 2020 I'm sure I could find a dyno within an hour or 2 from here. However I dont think there would be any point to running it on a dyno. I know its low on power. When I'm up to Weight and conditions are not perfect I can't even make it up to 60mph. If I do get up to speed she is giving it all she has just to keep it there. I wouldn't dare try to pass someone on the highway if they were going 90 cause it would take a mile to get passed them. Quote Link to comment Share on other sites More sharing options...
Dar Posted April 11, 2020 Author Share Posted April 11, 2020 *90 kms per hour. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.