2.7tdv6 engine

I've got a rrs 56reg hse . Will not start getting good fuel pressure right up to fuel rail.have checked cambelt and hp pump belt all ok but will not start.not sure if could be electrical not sure what to look for also waiting on compression test

Car new to you?
You will need to read the codes, and there will be loads of old crap stored, so need to clear what is there and then try startig it again, and see what new codes appear.
Icarsoft is the go to cheap diag tool, Gap IID is the much better one, but is 4 times the price.

If you put rough location (not postcode) there may be a LZ member nearby who has a code reader.

Thanks I'm in wigan. Car is new to me had it in local 4x4 specialist to fit lp fuel pump and pipes also new fuel filter but he said couldn't get it to start no compression. I said what about crank sensor he said live data showing a pulse .I said cambelt but mechanic never checked. I have checked cambelt and oil cover all ok.

Get a pry bar/large screwdriver and have a little wiggle/pry on the front crank pulley, basically see if you can get any back and forth movement or any up and down/wiggle.

You really need codes, otherwise you will be chasing your tail.
Icarsoft 100 quid, even if you only use it once and flog it on for 50 quid, it is still cheaper than getting someone else to read your codes.

Recent thread on here where a guy was having trouble getting his 2.7 to start after new cambelts, one cam was a knatts tadger out which was throwing a cam/crank sensor fault, retimed it and it was fixed.

Bri74 said:

Thanks I'm in wigan. Car is new to me had it in local 4x4 specialist to fit lp fuel pump and pipes also new fuel filter but he said couldn't get it to start no compression. I said what about crank sensor he said live data showing a pulse .I said cambelt but mechanic never checked. I have checked cambelt and oil cover all ok.

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If you bought the car from a dealer the engine and gearbox is covered for 6 months under EU law. I wouldn't touch it.

Will get codes read again see what it comes up with. Cambelt looks good 4x4 specialist said crank sensor getting pulse on diagnostics.car was bought as a non running project

Hi and welcome

plus 1 ^^^ , what has already been mentioned

if I may also add , my main concern is ur not getting any compression

4x4 specialist said fuel pressure good I've checked cambelt all looks good even though mechanic never checked I had to do it .said crank sensor getting pulse on diagnostics.also said not getting compression but he didn't say weather he tested it or just assumed. So I'm going to get the codes read again and get compression tested correctly.

Bri74 said:

4x4 specialist said fuel pressure good I've checked cambelt all looks good even though mechanic never checked I had to do it .said crank sensor getting pulse on diagnostics.also said not getting compression but he didn't say weather he tested it or just assumed. So I'm going to get the codes read again and get compression tested correctly.

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fingers crossed isn’t anything too serious , indeed always best to get it double checked

if the garage has a oscilloscope, which assume they have , can test the engines compression without having to remove anything, saving a lot of time and Ur pocket

As a side note , crank sensor sits down by the turbo

if there’s no compression , I’m fearful the crank has snapped as indeed the crank sensor would still get a signal, really hope I’m wrong

Plse let us know how things go

gstuart said:

fingers crossed isn’t anything too serious , indeed always best to get it double checked

if the garage has a oscilloscope, which assume they have , can test the engines compression without having to remove anything, saving a lot of time and Ur pocket

As a side note , crank sensor sits down by the turbo

if there’s no compression , I’m fearful the crank has snapped as indeed the crank sensor would still get a signal, really hope I’m wrong

Plse let us know how things go

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How do you get a compression reading with an oscilloscope?

Datatek said:

How do you get a compression reading with an oscilloscope?

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I have no idea, but would hazard a guess its to do with power draw.
I know you can do compression test on modern trucks using just the diag computer, again I am assuming along the same lines as oscilloscope.
It is probably along the lines of it is seeing if they all have the same power draw.

lynall said:

I have no idea, but would hazard a guess its to do with power draw.
I know you can do compression test on modern trucks using just the diag computer, again I am assuming along the same lines as oscilloscope.
It is probably along the lines of it is seeing if they all have the same power draw.

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From the starter motor I presume if that is the case, sounds a pretty unreliable method to me.

Only way forward is a compression check IMO..

With a proper tester!

Henry_b said:

Only way forward is a compression check IMO..

With a proper tester!

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I agree, too many possible variables to rely on load variation to compute compression pressures, I guess it would show no compression though.

Datatek said:

I agree, too many possible variables to rely on load variation to compute compression pressures, I guess it would show no compression though.

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I've never used a computer to do a compression test, never really heard of it tbf..

Probably "easier"?

Worth the effort doing it properly, even on a big rig, Scania V8's are an arse to do!!

Henry_b said:

I've never used a computer to do a compression test, never really heard of it tbf..

Probably "easier"?

Worth the effort doing it properly, even on a big rig, Scania V8's are an arse to do!!

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I've never heard of it either, as I say, it might be OK as an all or nothing test for a broken crank, but I don't see it being possible to compute actual pressures from current variation, too many things could affect the readings from a weak battery to dodgy connections.

I think it is more of a comparitive test between cylinders, ie they are all pretty much the same so the problem is elsewhere.

With the diag laptop you can shut down individual cylinders whilst the truck is running, again I would assume for comparison purposes, ie shut down one cylinder and the others have to up their game to keep the thing running, the computer works out how much extra effort they are taking.

You can do some proper clever stuff these days, and we only really scratch the surface.

lynall said:

I think it is more of a comparitive test between cylinders, ie they are all pretty much the same so the problem is elsewhere.

With the diag laptop you can shut down individual cylinders whilst the truck is running, again I would assume for comparison purposes, ie shut down one cylinder and the others have to up their game to keep the thing running, the computer works out how much extra effort they are taking.

You can do some proper clever stuff these days, and we only really scratch the surface.

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Clever stuff, the signal from the starter motor is as noisy as hell, must have some good filters to remove the garbage. MOT centres over here have a box that plugs into the cigarette lighter socket, it produces n RPM reading from the alternator generation frequency which it transmits to the test computer via bluetooth.

Datatek said:

I've never heard of it either, as I say, it might be OK as an all or nothing test for a broken crank, but I don't see it being possible to compute actual pressures from current variation, too many things could affect the readings from a weak battery to dodgy connections.

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It’s used on td5 to check compression on 5th cylinder as no glow plug on 5. Saves having to remove injectors

Datatek said:

Clever stuff, the signal from the starter motor is as noisy as hell, must have some good filters to remove the garbage. MOT centres over here have a box that plugs into the cigarette lighter socket, it produces n RPM reading from the alternator generation frequency which it transmits to the test computer via bluetooth.

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That sort of electrickery is way above my pay grade.

All the newer trucks pretty much run on pwm signals, so that is the next thing we have to learn, sorry I meant avoid!
I am getting to the age where quite frankly I could not give a toss about the newer stuff, it is interesting but mind boggling at the same time.