Car will not drive with choke off

[SambaS]

Hi my 84 Polonez will only drive when the choke is on full. Otherwise the accelerator kills the engine. Its on the standard twin choke Webber carb. 1481cc. It ran fine when I got it, now its ready for road I have this issue. It was parked up Oct-Jan

[SirSamuelOfBuca]

I know nothing but you checked battery?

[LotusOmega375D]

Shouldn't this be in the "Pistonheads 1985" thread?

[B'stard Child]

Blocked main jet

Depressing the accelerator and the engine dies indicates that too much air and not enough motion lotion is reaching the engine - choke circuit is either additional enrichment of motion lotion or a flap air restrictor solving the problem of too much air hence then you can press the louder pedal

Edited by B'stard Child on Friday 17th February 15:31

[B'stard Child]

LotusOmega375D said:

Shouldn't this be in the "Pistonheads 1985" thread?

You are a very funny guy.........

[SambaS]

Which is that then?

[SambaS]

the accelerator jet? ive had out, its fine. And the two brass screws below ive had out and they ok

[TonyRPH]

SambaS said:

Which is that then?

That looks like a Weber 36DCD7 (or one of it's variants).

I would remove the emulsion tubes and main jets and just give the various channels a blast with some compressed air.

Watch out for fuel being blasted back at you though - best to empty the float chamber first.

A blocked idle jet can also give the symptoms you describe. (yet the vehicle will still idle - but may be a little lumpy)

Edited by TonyRPH on Friday 17th February 15:50

[mnkiboy]

B'stard Child said:

Blocked main jet

Depressing the accelerator and the engine dies indicates that too much air and not enough motion lotion is reaching the engine - choke circuit is either additional enrichment of motion lotion or a flap air restrictor solving the problem of too much air hence then you can press the louder pedal

Edited by B'stard Child on Friday 17th February 15:31

This. It used to happen to my old Pug 205 every few months. Pressing the accelerator too quickly would kill the engine.

[B'stard Child]

SambaS said:

the accelerator jet? ive had out, its fine. And the two brass screws below ive had out and they ok

Accelerator jet not same as main jet - accelerator jet is to supply fuel in transition stage (ie initial enrichment) unless you are stamping on the throttle it won't be used

[Steffan]

B'stard Child said:

SambaS said:

the accelerator jet? ive had out, its fine. And the two brass screws below ive had out and they ok

Accelerator jet not same as main jet - accelerator jet is to supply fuel in transition stage (ie initial enrichment) unless you are stamping on the throttle it won't be used

Spot on advice. I am old enough to remember carburetor engines.

And the Polonez!

Sounds exactly like a blocked main jet to me. Take the carb to bits blow all the jets out with an airline inspect them all before reassembly.

Should sort the problem.

Otherwise check the fuel pressure and consider replacing the Main Jet. You can probably still get them I think they were identical to the Fiat model on which they were based. Was it the 124?

The experts on the the Make (!!!) will know.

[TonyRPH]

Hopefully this helps a bit.

IIRC the idle jets are just above the main jets (main jets are behind the 10mm hex head assembly).

[LotusOmega375D]

B'stard Child said:

LotusOmega375D said:

Shouldn't this be in the "Pistonheads 1985" thread?

You are a very funny guy.........

You share both my humour and my taste in cars! I'm flattered.

[Steffan]

SambaS said:

where is the main jet?

See post above. Most instructive I never knew the Polonez used a Weber (type).

[SambaS]

thanks! am on my mob and its a bit slow

[fangio]

Could also be a gasket letting air in......

[davepoth]

fangio said:

Could also be a gasket letting air in......

This is a pretty easy thing to check too. Get a can of WD40 and spray around where the carb seals to the manifold, the manifold to the engine head, and if fitted all along the vacuum pipe to the servo. A leak at any of those would let enough air in to make it run like crap.

If there is a leak, the WD40 will get sucked in and the revs will rise.

[SambaS]

took main jets out, can blow down one end and air comes out both little holes. Same problem. Also i dont have air line.

[B'stard Child]

Steffan said:

B'stard Child said:

SambaS said:

the accelerator jet? ive had out, its fine. And the two brass screws below ive had out and they ok

Accelerator jet not same as main jet - accelerator jet is to supply fuel in transition stage (ie initial enrichment) unless you are stamping on the throttle it won't be used

Spot on advice. I am old enough to remember carburetor engines.

I am too

However I was also bored enough one day to do this

Take 1 Opel Monza GSE - This one ;D



with a 3.0 24V Senator Engine



Remove all the fuel injection and manifolds - why? - because I wanted to



Add

Dellorto 40 Carbs x 3 £250
Custom manifold £200
Linkage Kit £88
Misc Machining work £55
Longer throttle cable £20
Bell Mouths x6 £75
Fuel Pressure regulators £80
Filters x 6 £101
Gaskets x 6 £60
Fuel hose £10
Parts for carbs £40

Add a book on carb tuning £20

total £999

Fit it all



Fire it up (Just a snippet)

http://www.youtube.com/watch?v=xunOFKxu07s

Priceless ;D

[The Nur]

B'stard Child said:

lots of things

That sounds sexy as hell.