2008 Renault Master 2.5 G9U engine

Neilcur · Post by **Neilcur** » Wed Dec 04, 2013 4:33 pm

Got above vehicle is with a misfre.

Carried out a relative compression check and got an odd result!

I'm just wondering why one peak is higher than the rest?

Poss a sticking valve?

Done a comp test through pico diagnostics and all cylinders were in the green so not sure which to believe

Thanks Neil

Avdr · Post by **Avdr** » Wed Dec 04, 2013 4:41 pm

Interesting, would be good to see a physical compression pressure comparison.

Robski · Post by **Robski** » Wed Dec 04, 2013 6:09 pm

WPS/FLS owner ?

MAF or MAP ?

Neilcur · Post by **Neilcur** » Wed Dec 04, 2013 6:16 pm

One of the 4 compression humps is higher than the other 3 indicating higher compression in that cylinder?

Also noticed when it runs it is making 'puffing' noise out of the air intake.

Don't own a FLS or WPS.

Struggling to find an adapter to do a physical comp test to compare to scope trace which does not help.

MAF sensor on this engine

Neil

Robski · Post by **Robski** » Wed Dec 04, 2013 6:23 pm

One of the 4 compression humps is higher than the other 3 indicating higher compression in that cylinder?

I saw that, i edited my post as i missed you say in for a misfire.

Well without WPS or FLS i can't think of a way to 'none intrusively' see the valve events ........... only if it was MAF & an intake valve, looks exh valve to me with the comp hump......

Have you ID'd the cyl with a sync ?

Neilcur · Post by **Neilcur** » Wed Dec 04, 2013 6:30 pm

Yeah i replied and your post had changed!

Yes i have identified which cylinder looks 'high'

Scan tool does not list fuel correction factors, thought numbers may of backed up trace

Neil

Fat Freddy · Post by **Fat Freddy** » Fri Dec 06, 2013 9:49 am

Just a thought.

Leaking inlet valve. Two normal humps - compressions, followed by a slightly lower hump which I'm thinking is air leaking into the inlet manifold which

is making 'puffing' noise out of the air intake

The next cylinder now has a better VE there fore shows the higher comp hump.

FF

Neilcur · Post by **Neilcur** » Sun Dec 08, 2013 5:56 pm

Customer gave the go ahead to strip engine down to inspect what was going on but we didn't get far, on this engine the injectors need to be removed along with the glow plugs to remove the rocker cover.

All 4 injectors are seized solid and will need someone in with the gear to pull them out.

Phoned customer and explained costs would go up before we even got cylinder head off and also gave the option of a s/h engine but they are pricey units for this vehicle

At 200k miles and also needing other work on the vehicle, he has decided to scrap it due to lack of funds so this one won't have an outcome which is a shame as i would of liked to seen what was causing the fault.

Thanks to Robski, Fat Freddy and Avdr for the help/suggestions

Avdr · Post by **Avdr** » Mon Dec 09, 2013 9:05 am

Have heard of people using the chain blocks and home made adaptors to pull injectors out. Lot of messing though.

Neilcur · Post by **Neilcur** » Tue Dec 10, 2013 8:31 pm

No room to get anything in apart from screwing a puller to body of injector but don't have the tools.

Had them hanging before on a trafic with a plate under injector and a chain onto engine hoist and front wheels off the ground and no movement

Once they seize, nothing will get them out unless you have the proper kit!

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2008 Renault Master 2.5 G9U engine

2008 Renault Master 2.5 G9U engine

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