18r Issues - Timing, Carby?

[rtrona]

Hi Guys,

Firstly, I have searched through the forum and have not found anything with much relevance to my problem.

I am having some issues with my corona, 18r, with a 32/36 weber. It started with alternator dying and after 3 mishaps with wreckers, ebay purchases i finally got the correct alternator.

So i put a fully charged battery in the car and drove it to my friends garage to get the alternator changed. On the journey it missed and carried on when under load.

While the car was off the road i also purchased some new bits for it, all very cheap - new fuel pump, weber rebuild kit, gt40rt coil

We got the car running but it would not rev, would idle but anything above roughly 1500rpm it would die, (as if you put your hand over the carby to kill it). Had a mechanic say it was getting weak spark. So being in remote location it was an issue getting points, rotor button, condensor etc. So i put my old 18r distributor in the car. Cut a long storey short the engine was hand cranked with the distributor out - this was not done by me.

For some reason the other 18r distributor off the old engine would not sit down correctly, so got some new points, condensor and rotor button for the original distributor that came with the engine. Timing ended up being 180 degrees out. Rectified that problem, (did not realise you can turn the oil pump with a screw driver to line up the rotor button to fire on cylinder 1)

Got the car running and all timed correctly. Still won't rev. Some times the car will start with ease other times it will just shoot petrol out of the carby and backfire out the carby and not fire (but not firing out the carby anywhere near as bad as it did when the timing was 180 degrees out).

I'm not to mechanically minded myself. I am not sure whether this now would be carby related? (keeping in mind it has just had a rebuilt kit put through it), Spark issue (plugs, leads, coil, points,condensor,rotor button all new), or timing (which we have done with a timing light, it is at TDC).

I'm feeling this may be something easy that i have missed, over looked?, would be alot easier for me to get a mechanic to look at it but there is only 1 here and he is rather busy!

Just thought i would see what you guys could suggest. Would incorrect float levels on carby cause this? They look correct. Could it be points gap?

Thanks for looking

Cheers Mark.

[MWP]

So... are you 100% sure the engine is at TDC when the dizzy is?
Not just cyl1 at the top, but at the top during its compression stroke?
You may need to pop off the cam cover to check when it is at TDC and the cyl1 valves are closed.

Check that first...

[rtrona]

Sorry yes, Was at the top of compression stroke, at TDC and was lined up with cylinder 1 with rotor button.
Have just read that some newer mechanical fuel pumps put through to much pressure for the webers? this is a fuel miser pump and listed as OEM replacement. Has anyone had this be an issue?

[SilverRA23]

When cars are missing and coughing, it can come back to the charge from the alternator/battery.

Are you getting 13 odd volts from the alternator when the car is running?

You could have got yourself a good alternator, but your voltage regulator, which is separate on a 18r corona i imagine like a celica, is still not delivering the volts to the engine that it needs to run cleanly..

[airfireman1]

Have you checked the firing order? . You need to check the dizzy again and look for bad earths, check the points for the correct gap and also the condenser. you may also just want to check the static timing as you may have a worn crankshaft keyway and that may out your timing out of wack.
cheers dave

[leso]

do you have access to a timing light...???

if so check to see if the timing advances when the engine revs...

one of many possibles ...

[wheel rim]

Hi Mate,
When you use a weber on an 18r the timing is not the same as factory set up. Get the thing running and turn the distributor until the engine runs better.
It has been a while since I did mine so I can't remember where it is timed, I will check for you and get back to you where I have set it.
Cheers Wheelie.

[roadkill]

hI,

I would guess that if it idles ok then i'd doubt it's timing or electrical. Check that timing too, isn't it supposed to be 12 deg btdc? I'd still double check ur points gap, double check voltage blah blah blah but my guess is it's the carbie. Is it flooding it? Ie when you go to rev it and it dies does it start back up again easily? It could be running really lean and when you rev it it just hasn't got enough fuel either. Pretty sure webers can handle a decent amount of fuel pressure. If it's not flooding it try using your hand as a choke over the inlet of the carbie as you bring the revs up. If the revs pickup whilst your restricting the airflow with your hand then it's definately lean. Another thing, your fuel pump could be rooted and not suppling enough fuel. I know it's new but that doesn't mean it's not farked.

I'm sure it'll be something easily fixed, just alot of things can do it

[rtrona]

Hi! Sorry for the late reply. My computer has died so have to use the iPhone which are pretty crap for the web. So excuse me for my poor grammar.
The issue has been fixed. Was something very simple, a part in the carby was put in back to front!! Easy fixed. Car runs pretty good now. And have just noticed the welch plugs are leaking!
Thanks for all your help guys!