Compression Reading

[Dukhudson]

Hi all

I've had a bit of blue smoke under heavy acceleration, if I drive like I'm picking up the Sunday paper it seems okay, I've even tried after a run and pull up at home and rev the nuts off it I get no smoke. Even under blue smoke conditions there is no loss of power or flat spots

I've done a compression test and got the following results
Cylinder 1 360psi/25bar
Cylinder 2 380psi/27bar
Cylinder 3 360psi/25bar
Cylinder 4 320psi/22bar

They say if the difference is more than 10% it's likely to be a fault but do you work it out from highest to lowest or from the middle to the to highest and lowest points

From high to lowest 15.79%
From middle to lowest 11.11%
From middle to highest 5.56%

I know the middle very much border line but the highest to lowest looks quite bad.

Just looking for some opinions

Thanks in advance

[metalworker0]

if you are a Former Ford Main Dealer Tech, why are you asking questions like this ?

Year and mileage of van would be good

Anyway ..ive heard EGR faults can cause all sorts of problems . (cleaning needed maybe)

plus ..depending on mileage ..which you don't mention

There is or will be a problem with excessive build up of carbon in the intake tract and on the intake valves , causing them to stick open - due to the EGR and breather fumes mixing.

another thing - not sure this is relevant ..."No where" in fords service schedule is there any mention of checking valve clearances as a service item ...i wonder if this act should be done sometime up to or before 100,000 miles ..you never know what you may find ..but be careful as the build of carbon could chuck all your measurements off .
if there is excessive clearance, suspect carbon first before wear ....and again mileage plays into this .

These are the simple things to check first ..before you get into ..turbos, diesel pumps etc.

just read your other post ......if it wasn't doing it before...meaning whilst egr delete was in effect ..there is no reason to suspect egr delete is the cause..

Unless the -plate has burned through . thee are some EGR plates that have a small hole in them ...suspect this type is more prone to burning through

all the best.mark

[Kenton]

if you are a Former Ford Main Dealer Tech, why are you asking questions like this ?

Year and mileage of van would be good

Anyway ..ive heard EGR faults can cause all sorts of problems . (cleaning needed maybe)

plus ..depending on mileage ..which you don't mention

There is or will be a problem with excessive build up of carbon in the intake tract and on the intake valves , causing them to stick open - due to the EGR and breather fumes mixing.

another thing - not sure this is relevant ..."No where" in fords service schedule is there any mention of checking valve clearances as a service item ...i wonder if this act should be done sometime up to or before 100,000 miles ..you never know what you may find ..but be careful as the build of carbon could chuck all your measurements off .
if there is excessive clearance, suspect carbon first before wear ....and again mileage plays into this .

These are the simple things to check first ..before you get into ..turbos, diesel pumps etc.

just read your other post ......if it wasn't doing it before...meaning whilst egr delete was in effect ..there is no reason to suspect egr delete is the cause..

Unless the -plate has burned through . thee are some EGR plates that have a small hole in them ...suspect this type is more prone to burning through

all the best.mark

Harsh. You are (self proclaimed) no tech, nor mechanic either, then you try and give advice. You look on the net for all your info, which is hit and miss at the best. He's looking for opinions. Take a step back, and take a breath man.

[metalworker0]

yeah i thought the same after i has posted . just my warped sense of humour. ...should have put a Smiley after it .

its all hit an miss once these vans get old

[Dukhudson]

In fairness in the 11 years I was a tech I only did compression readings once. Main dealers hardly ever do them. I checked them against my '04 plate 219000miles and that didn't smoke at all except white smoke at the end of its life (fuel pump broke up on that and done the injectors in) that had similar if not worse readings lowest being 310 highest being 390 middle readings around 360 (psi)

Even though there's minimal play I'm suspecting the turbo as I don't get any smoke if I keep it under 2000rpm

[Altransit]

I would say that those readings aren't too bad for an older high mileage vehicle, especially if its otherwise running well, so I would be inclined to suspect the turbo for the blue smoke.

Just my opinion, I'm not an engine tech, but have a fair bit of DIY experience

[dumper]

All my working life never did a compression test on a diesel yes petrol all the time probably down to the cost of a diesel tester one usually when a diesel loses compression it starts with bad starting or blowing oil out everywhere usually at work we would charge ancillary parts and run them till they got that bad we had to charge the engine at a mileage of over 500,000.

[Dukhudson]

Amazon selling diesel compression testers for under £40, seems to decent quality too!