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[hoofing it]

Right all ive been having a wee problem with my Senny backfiring into the inlet manifold.

The timing is spot on all the leads,coil,plugs etc replaced but it stills does it.

Its a 1986 3.0 cdi

Im thinking along the lines of the valves and valve seats could be burnt out.

It came out of the factory as a unleaded (2 star) engine.

Any suggestions 

[4x4]

Check for play on distributor arm,also rotor arm,and check dizzy cap,also efi ecu may be faulty.

[Nick W]

Timing chain slipped?
Leaking injector?

[4x4]

Iirc there was a plug you could swap around to use either unleaded or 4* on the passenger side near shock mount.

[biggriffin]

Check leads in correct order on dizzy, check dizzy as they do wear out,there is a known fault with those distributor's.
I would post the fault on abs,as might be a member who can help.

[biggriffin]

Iirc there was a plug you could swap around to use either unleaded or 4* on the passenger side near shock mount.

The ron plug. Thought it was on drivers side, green coloured,with 95' stamped in white letters,and you just un plug it and turned it over...

[4x4]

Been a while since ive been under the bonnet of a senator,that was 15 yrs ago lol

[Andy B]

Pretty sure my 89 Senator 12 valve didn't have the 'ron plug' 

If you think burnt out valves, how about a compression test?

I'd doubt timing chain issues, having a duplex chain, they're usually bullet proof

It's been a very loooong time since I've been under the bonnet of a 12v Senny too

[hoofing it]

Cheers for the replies guys.
I never thought about the Dizzy being worn/loose.
All the leads are bosch and the plugs NGK.
I would ask on ABS (been a member for 10 years) but I can't remember my password or user i.d lol.
This engine doesn't have the ron plug and as ive found out getting parts is a pain in the arse because the 1986 senny A was made up with parts from GM/OPEL & VAUXHAL.
The car goes great it's more so noticeable when moving of from a standing start.
I replace the fuel pump.
The next step will be a compression test 

[chuftsmv6]

Hi there i love the senator I havnt seen one for years I really hope you get it sorted

[Andy B]

Hi there i love the senator I havnt seen one for years  ....

Me neither, though my daughter sent me a picture of a civvy L reg Senator she was sat behind at the traffic lights a few weeks ago

[Webby the Bear]

Whats the symptoms of a back fire? presumably loud bangs coming from tut inlet manifold? ive never heard of this before your thread

[Kevin Wood]

Lean running can cause backfiring too.

[Rods2]

Inlet or exhaust air leak?

[hoofing it]

Whats the symptoms of a back fire? presumably loud bangs coming from tut inlet manifold? ive never heard of this before your thread

It back fires on the inlet side (in the manifold)

Hi there i love the senator I havnt seen one for years I really hope you get it sorted

The one I have is the A series (carlton shape)