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Engine running issues AGAIN!!!

1673 Views 10 Replies 6 Participants Last post by  Mr.Whippy
Right here we go again! This engine is starting to really wind me up now!

I rebuild my engine, and have got it back in the car. I have set the valve clearances, set the points, static timed it and everything is on as it should be.
I have also set the carb to the factory setting, and had it to bits no end of times today. Also the auto choke has been disabled too.

It fires up straight away, but revs its nuts off then dies. If you pump the throttle it will keep running until you stop then it will die again. It keeps spitting from the top of the carb as its getting loads of fuel (maybe too much?)

I am totally stumped now, and have been outside in the rain since 930am trying to sort it, and im no further along :mad:

Has anyone got any ideas?
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i'd guess vacuum leak in the inlet manifold, maybe... you're gonna have to do some detective work though! and it sounds like a brew might go down nicely too! good luck!
Haha, I have had quite a few brews so far! Only thing keeping me warm!

I have checked inlet manifold, and everything is done up nice and tight and it is all seated correctly.

I just cant understand!
have you tried wetting the manifold boots to check for air leakages?

Just a thought :)
Ahhh good idea! I shall try that later!
It fires up straight away, but revs its nuts off then dies.
As someone has already said, That does sound like an air leak.....

The inlet fanny mould you have..... does it have a little pipe coming out of the upright section that the carb bolts to ?
(Sometimes used for servo assisted brakes)
If so, check that it's still blocked off.
spray round inlet joints with wd40 if heres a leak the revs will change.
If it keeps running when u pump the throttle and spits back thro the carb , it could be a blocked jet. spitting back could also be ignition to retarded
Thanks for advice so far guys.

Still not having any joy. Have checked all round the inlet for leaks, and spraying wd made no difference. I have also had the carb to bits and checked and blown through all jets, replaced the float needle thingy again and cleaned it all out. Still nothing.

Any other ideas? I cant even drive it to take it to a garage!
Why have you disabled the choke and how have you done it ?

It sounds like an air leak.
Check list -
New gasket between carb and manifold.
Blanking plug still in place on carb body.
No open pipes on carb or inlet manifold - everything should be either connected or blanked off.
Check the rubber vac hoses to the air filter and distributor carefully - the rubber often cracks underneath the cotton braid.
Manifolds bolted to head with new gaskets (preferably card ones if it's a twinport - the tin gaskets can leak.)
Tinware trapped between manifold and head meaning the manifold can't seal fully.
Washers dropped over the inlet manifold studs before fitting the manifold end castings (Voice of experience) :rolleyes:
Hose (jubilee) clips used to seal the rubber manifold boots instead of the proper VW ones - Ordinary clips pinch the rubber where they join and can cause air leaks especially if overtightened.

Use a length of flexy pipe to listen around the engine for the sound of air being sucked in. Fuel pipe is good but you can use hosepipe. A better method than using WD40 IMHO.

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Awesome thanks for that Dave.

I disabled the choke by unclipping the wire and taping it up out of the way, and then winding the coil bit round until it wouldnt go any further, so the butterfly stays open.

I think I'm going to have to start taking it all to bits again then to check for things!
Spitting back from the carb can be a sign of a weak mixture (assuming all your other settings are OK). I suggest you get your choke back up and working too, that won't be making things any easier.

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