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Mine did that - but it is a Diesel - however the shudder is usually bad trans fluid or partially clogged pan filter contributing to causing low line pressure . Have you changed it recently - mine did this when I put in synthetic trans fluid. I then put in a can of Seafoam Trans Tune, it got...

Sorry to buck the "Feed The Beast" trend - but the line reduces from GM to increase PRESSURE at the IP. It is known as Boyles law in the engineering field. It was not an error - the error was in putting on those feckless lift pumps thinking they could reliably put out pressure and volume for...

Yes - but usually the 4911 simply says that only on it. It is for the 6.5 turbo diesel and is the last incarnation of the DB2 for the 6.5 Turbo diesel. As I originally said to get he best performance - the DB2 you have for the 6.2 "MAY" need mods to get more fuel out of it. You would use a...

You do not say if it is white or black true smoke - or what could also be steam from a coolant head gasket leak. I agree with NVW at https://www.thetruckstop.us/forum/threads/93-td-hard-cold-start-with-lots-of-smoke.47715/post-564306 that you should do a compression test first. the smoking...

You have to build it yourself what I have You do not have to cut the OEM fuel lines. Use 3/8 flare to 1/4 npt adapters and put a larger o-ring over the OEM fuel line at the end - you will have to source the best size o-ring - in the flare side over the OEM fuel line, and 1/4 npt side goes...

Love it . . . I have a "Mr. Goodwrench" that has the serial and manufacture stuff ground off - rebuilt early 4L80E for a Diesel I was going to rebuild - that I have not opened up yet - and it has the short shift input shaft with no selector switch - and now I have a better bolierplate to work...

The DB2 lift pump specs are TESTED on the bench stand at 5 psi as is the DS4 Running OEM specs are largely the same as the DS4 and the lift pumps are spec'ed the same The DB2 can also take up 14 psi and the specs for even the 1992 mechanical lift pump to the 6.2 is 9 psi The DB2 of the 6.5...

Exactly what I found and then four Airtex units later - even the Airtex units would not hit 14 and keep it past a few days. The design is a failure - a SPRING is not a fuel pump. On the last two I got one said made in China and other said made in Mexico on the UPC label Both the DS4 and DB2...

I have the van engine. By Carter Lift Pump Kit - if you mean a CARP4601HP - then yes that is GREAT - but it may cause surges and runaway, so it "may" need a regulator to hold it to or just under 15 psi - since it can push 18 psi. Try it first - it may tolerate it just fine. You can get...

Yes and no - the injector lines on the 6.5 are different at the IP - otherwise you can put the DB2 mechanical pump itself on the 6.5 - but it is likely too small in terms of fuel delivery to give good performance - unless it is DB2 4911 - but it will "work" - you will just have to use both the...

It seems you have a few of these 6.5's - but the mechanical DB2 will "try" to suck fuel if the lift pump is not doing its job while a DS4 based vehicle will usually just cut off at coast or returning to idle. The DB2 will start and do what you are describing at higher a rpm if it cannot suck...

I am familiar that write up. What so many analysis situations of the DS4 and PCM forget to factor in is the inlet fuel pressure to the DS4 determines the potential for how it may perform This post says it well...

This correct . . . that why I said run an additive that has biocide characteristics religiously at https://www.thetruckstop.us/forum/threads/turbo-upgrade.47733/post-564037 If you let algae or the possibily of it fester = it is bad news

Yes it does. The proper name is called TDC OFFSET Learn - But it does not work key on key off. It needs a Tech 2 to do it. It is found on page 5-44 of the GM 6.5L Diesel Engine EFI/Mechanical Systems manual (16015.20-4)

It will compress more air per rpm of the turbine wheel - yes - but assumes you have a tight turbo waste gate system. On the 6.5 that means a tight vacuum system with a strong vacuum pump to keep the waste gate closed to that higher boost potential The waste gate natural state is open -...

Consider .001 undersize rod bearings only along with all the rest at your option of what everyone else has already recommended. You do not have to grind or remove the crank - just plasti-gauge them to make sure they are not TOO tight. It will do wonders for oil pressure. with 254K on it the...

This is correct. Also if again you have low IP pressures to the IP it may FOAM and not fill the upper cavity to where the optical sensor is. A really dark compendium of fuel additives - like really dark brown - and algae which make also darken it will mess with the optical sensor and it will...

Will L. . . . No NOT so much a proponent of keeping the PMD on the IP, as much as IF you have enough fuel pressure on IP - like 9 and slightly over - it will open the check valve and recirculate fuel so that COOL fuel is always in the IP which then does a good enough job - and sometimes...

I will watch this thread. I was thinking all the things Deere65 is until I got a decent reliable Sure Cure Lift Pump on mine, to keep 9 psi at the IP like the Stanadyne spec says - and fixed vacuum leaks and put on a new stronger vacuum pump so the waste gate would work properly. It was a...

What do you mean "blew out" - what happened ?? Aside from who ever is doing this - should be knowledgeable and check for cracks, what are they doing specifically to rebuild it ?? There are some details to rebuilding a 6.5 that make a lot of difference