staxx

Need to check the connection at turbo they get loose because the fan is always blowing on it, if they have never been replaced this is or will be a issue for you later causes 45 code not expensive to fix 3 pins and 1 hour labor with key on engine off if you wiggle the connector and its loose you should hear the vgt surge air psi attemp to move, hope this helps sorry to hear about the unexpected deer hunt .

Fuses CB-1 and CB-7 control power to vecu that is causing this code may try replacing or swapping with known good relays also ther is a ground lug post on left side dash behind speedometer tach panel make sure all wiresare tight and clean. There is alot more to this code sometimes but this would be a good place to start.

There is sevral power relays to the left of your fuse panel in glove box sometimes they get hot and start to stick try replacing one at a time or check and make sure where wires go in they are not melted wornout key switch will do this also and shorted altinator possability try loosening belt up and make sure bearing seems ok spins free no excessive noise.

Welcome to BMT , lots of good people here have fun and enjoy.

Check and make sure the bottom of the fuel bowl housing is tight no wet spots then I would be looking at stuff like fuel overflow valve at return side on engine right above air compressor, sure fuel is not leaking internaly into engine at supply pump or unit pumps etc. also check and make sure all fittings are tight from fuel water separater to engine.

This is what you are looking for ,either the ball valve is stuck open with debris or with spring is missing or rusted and collapsed .

check were the fuel line comes into the fuel filter bowl there is a 90 degree fitting and in the straight part is a ball and spring check valve .

If you wasnt so far away I would help.

Keep us updated on making a new egr cooler and how it goes, but I think it would be cheaper to just eliminate the egr system instead.

What is the differance between the Mack and Volvo frames right now?

Since this is a new truck to you maybe have valves adjusted for maintance and to just inspect valve train suggest replacing rocker shaft bolts and retorqing rockershafts this way you know everything is ok with vavetrain.

EGR valve can be physically checked if removed good or bad if its not bad just reinstall egr will just give you low hp and smoke if not working correctly if egr cooler was leaking coolant into mass flow pipe when egr valve opens it would be blown into intake manifold and cause issues when injector cups leak s coolant on a aset engine it leaks out where the fuel line enters the head not into combustion cylinder . If it was electrical should see some codes like 45 or 95 would do this but no codes so has to be mechnical most likely I did have a altinator on a truck once that had one strand or wire shorting to case giving the ecu a heartattack and it only happened after long hot run with no codes .Thought about speed sensor settings last nite but that info goes to the vehical module that just tell engine ecu to limit power to whatever setting is Still think fuel psi see if dealership will hook up external fuel gauge temperory and let you drive and monitor fuel when this happens .

Low side will be on firewall .

Could check overflow valve on fuel return, follow that silver line next to air compresor to block and its the fitting that screws into the block has a spring and valve in it .look in your fuel tank with flash lite at nite and you can see the bottom of tank alot better then in daylite check for debris.

The supply pump is part of that filter assembly have seen alot of those fail gear on shaft sliping or housing sucking air engine looks clean new egr cooler and mass flow pipe on there thats good.

What style fuel supply pump do you have one with fuel filter or without?

I have had rocker shaft bolt back out almost broken causing rocker shaft to lift up leaving valves out of adjustment but more likely fuel psi you wouldnt beleive the stuff I have pulled from fuel tanks ....bottle caps fuel cap chains rocks mouse fuel nozzle from ful island could have something in fuel tank when these engine lose fuel psi fast like turned off then back on they backfire .

If its backfiring the camshaft rollers will not put up with this for long you have ceramic rollers in there very hard surfface but do not absorb hard hits like a backfire.

valve train related have seen broken rocker shaft mount bolts could be camshaft issue, trying to think of cheap easy stuff first.

Still sounds like a fuel pressure issue .

Can you tell if its coming from intake or exhaust 41code speed sensor on trans can check adjustsment turn sensor in till it bottoms out the back it out one turn also check mack sure the tone ring is not loose make sure trans output yoke nut is tight.....sensor ohm check should be around 300 .

Ok I would still want to know what the fuel psi is doing when this happens those fuel supply pumps have a high failure rate. There are 2 engine position sensors one on front engine cover that watchs cam timing and one in the flywheel housing watching crankshaft timing and speed rpm dont think trans would be issue havint seen that before but theres a first for everything , are we sure it backfireing broken hood springs make alot of noise too .......my best guess is the exhaust brake the solinoid on the rockershaft has too orings and when the one in the bottom fails it splits causing exhaust brake to come on randamly have seen exhast manifold studs run in too far on bottom making contact with push tubes also, look and make sure they all look even ...hope this helps.

Was talking to 84superdog and he said they made 6-7 4 door R,s for NYFD This one at flushing airport how much of its still there ?

I probably have the wiring diagram will check tommaro if I can find it i could make a copy, are you looking to fix something specific.

Skip the power puck and jersey cop/dot do not like smoke so keep it running clean for now .