Froggie Posted March 17, 2010 Share Posted March 17, 2010 Hi all I've just put a new (well recon) engine in my Disco TD5 (2001) and it is as if it has a limiter fitted. I can accelerate fine up to 3000rpm or 60mph then there just is no guts left in it. Its baffleing me, all i can think of doing now is taking it to LR and getting the ECU checked out... Any ideas? Thanks Steve Quote Link to comment Share on other sites More sharing options...
BogMonster Posted March 17, 2010 Share Posted March 17, 2010 Fuel pump is probably fked, you need a fuel pressure check, I suspect you will find it is dropping off under load. It won't show as a fault code in the ECU so ignore anybody who tells you otherwise as they are talking out of their bottom. The only way to be sure is to plumb a gauge (or a Testbook) into the fuel rail and go thrash it up a hill. Quote Link to comment Share on other sites More sharing options...
K88 MUD Posted March 18, 2010 Share Posted March 18, 2010 Fuel pump is probably fked, you need a fuel pressure check, I suspect you will find it is dropping off under load. It won't show as a fault code in the ECU so ignore anybody who tells you otherwise as they are talking out of their bottom. The only way to be sure is to plumb a gauge (or a Testbook) into the fuel rail and go thrash it up a hill. Agree 100%....could also be the fuel pressure reg. Quote Link to comment Share on other sites More sharing options...
JohnL Posted March 18, 2010 Share Posted March 18, 2010 Certainly fuel related but suggest you try a new filter before taking the expensive dealer route. Cheers, John Quote Link to comment Share on other sites More sharing options...
Juz Posted March 18, 2010 Share Posted March 18, 2010 Could also be blocked injectors. Juz Quote Link to comment Share on other sites More sharing options...
Reng Posted March 18, 2010 Share Posted March 18, 2010 Could the Injectors have been transposed or replaced during your engine swop. Remember injector codes are registerd in the ECU and are unique to each injector and location on the engine. Quote Link to comment Share on other sites More sharing options...
landy andy. Posted March 18, 2010 Share Posted March 18, 2010 Would the actuator on the turbo effect this? Andy Quote Link to comment Share on other sites More sharing options...
Froggie Posted March 21, 2010 Author Share Posted March 21, 2010 Could it be the waste gate? i have a NANOCOM connected and when the revs get to about 2500k (under load) the turbo pressure drops to zero. The engine was a straight swap, we didnt touch the injectors. Would the ECU need updating when a new engine is put in. Quote Link to comment Share on other sites More sharing options...
sharp'i's Posted April 6, 2010 Share Posted April 6, 2010 Hi all I've just put a new (well recon) engine in my Disco TD5 (2001) and it is as if it has a limiter fitted. I can accelerate fine up to 3000rpm or 60mph then there just is no guts left in it. Its baffleing me, all i can think of doing now is taking it to LR and getting the ECU checked out... Any ideas? Thanks Steve Quote Link to comment Share on other sites More sharing options...
sharp'i's Posted April 6, 2010 Share Posted April 6, 2010 I have a similar problem. My 11year old TD5 Disco (only 52k miles) starts and runs superbly. But if I take it out on to a dual carriageway under acceleration in 3rd and 4th it starts to miss horribly at just below 3000rpm. In 5th it becomes gutless under load above 2700rpm. Yesterday coming back from the East Midlands in 5th the vehicle would not accelerate over 70mph but would do more and above 3000rpm downhill. What does this tell me. 1. There can't be a problem with the fuel pump. I guess it either works or doesn't. 2. It cannot be the dual mass flywheel/clutch disintegrating (as I have heard can happen) as it was smooth when doing 3000rpm down hill (that was the intended check to get it to 3000rpm). I like the possibility of fuel filter or separator being clogged. What normally happens with the regulator? Does it fail or go out of calibration? I have no error messages. Could it be that it just does to much around town stuff and too little hard work? Any help would be much appreciated because I do not want to get into the grips of LR dealers or local garages as they will happily take my money changing things that are OK. sharp'i's Quote Link to comment Share on other sites More sharing options...
BogMonster Posted April 6, 2010 Share Posted April 6, 2010 There can't be a problem with the fuel pump. I guess it either works or doesn't. Not necessarily an accurate guess... Quote Link to comment Share on other sites More sharing options...
M&S Posted April 6, 2010 Share Posted April 6, 2010 Unplug the MAF sensor and go for a drive... Mine had the same symptoms. Unplugging the sensor sets a default value, truck then ran fine. Plugged it in and problem came back. New sensor and all was well. Free and simple to check - you don't even need any tools Quote Link to comment Share on other sites More sharing options...
sharp'i's Posted April 6, 2010 Share Posted April 6, 2010 Unplug the MAF sensor and go for a drive... Mine had the same symptoms. Unplugging the sensor sets a default value, truck then ran fine. Plugged it in and problem came back. New sensor and all was well. Free and simple to check - you don't even need any tools Quote Link to comment Share on other sites More sharing options...
sharp'i's Posted April 6, 2010 Share Posted April 6, 2010 Old Hand - thank you I will try what you have suggested. sharp'i's Quote Link to comment Share on other sites More sharing options...
disco_al Posted April 6, 2010 Share Posted April 6, 2010 The engine was a straight swap, we didnt touch the injectors. Would the ECU need updating when a new engine is put in did you actually swap the injectors over? if not then i suspect that is the problem. the ecu is reading the wrong injector codes, causing limp mode maybe? not too clued up on all this electrical witchcraft that these modern lumps use, prefer the mechanical ruggedness of my 300..... Quote Link to comment Share on other sites More sharing options...
carlosbeldia Posted April 6, 2010 Share Posted April 6, 2010 Not having the right codes only makes your engine a little "rough", no power or limitations matters (my ouwn expirience having not a single code agree during 2 years). It seems like you have a wastegate actuator arm stuck (same sympthoms a few weeks ago in my 2001). Go for a WD40 and pliers ride.... it's the cheapest way to find out.... Quote Link to comment Share on other sites More sharing options...
sharp'i's Posted April 28, 2010 Share Posted April 28, 2010 I have finally got around to trying out the TD5 without the MAF sensor connected. It ran a lot better but still had the missing at around 3000rpm but not so bad. This could be just under using the diesel engine. However as I say the engine seemed uninhibited and ran with more power. What does the MAF sensor do as it is still disconnected and it works fine? Is its purpose to cut the fuel supply when your foot is off the accelerator? I may try changing the fuel filter before I do anything else. Quote Link to comment Share on other sites More sharing options...
BogMonster Posted April 28, 2010 Share Posted April 28, 2010 It's function is to match the air flow into the engine with the amount of fuel the ECU is injecting to get the maximum power. If it was better without, then the old one was completely kaput, fit a new one and you should see an improvement again Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted April 28, 2010 Share Posted April 28, 2010 It's function is to match the air flow into the engine with the amount of fuel the ECU is injecting to get the maximum power. If it was better without, then the old one was completely kaput, fit a new one and you should see an improvement again Surely t'other way round - the airflow meter tells the ECU how much air has gone in so the ECU can inject the correct amount of fuel. It doesn't control the amount of air Can I also add: "Pah, these diesels with all their complicated and unreliable electronics, you want a nice V8 with fuel and sparks" Quote Link to comment Share on other sites More sharing options...
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