Engine Problems today.

**JDNSW** · 4th December 2012, 08:01 PM

Today I took the 2a in for a pink slip, which it passed with no problems. However, soon after leaving the mechanic's it started misbehaving. Every time I slowed the engine to an idle, it would stop, and be difficult to start. It got worse every time during the day, although at first, leaving it for a while enabled it to start. Eventually, I spent about three hours trying to start it, fortunately in a shopping centre car park. During this time I pulled the carburetter to bits and found no problems, confirmed that fuel was being delivered (and the bowl was full when I pulled the carby apart), and checked the distributor without finding any problems. Eventually, after putting it back together, I got it started. By using the hand throttle to set the idle at 2,000rpm, I was able to keep it going to get home. Performance on the road was normal, maintaining 100kmh without any problems, temperature and engine sound being normal. When idling at 2000 however, the exhaust is popping and spluttering, and when I got home and moved the hand throttle back to normal, the engine promptly stopped.

Any bright ideas? I had a brainwave on the way home - sounds like a vacuum leak, possibly an intermittent one. First thing I am going to do tomorrow is pull the PCV to bits, and then vacuum check the vacuum advance. But if anyone else has ideas, lets hear them!

John

**debruiser** · 4th December 2012, 08:42 PM

maybe a bad coil????

Although remember I'm younger than your car.... so....

**vnx205** · 4th December 2012, 08:44 PM

Manifold loose?

But I suppose the exhaust manifold would be spitting too if that was the case.

Inlet manifold gasket gone allowing air to leak in, giving a very lean mixture?

If it is good under load, it doesn't sound electrical unless it is intermittent.

**jakeslouw** · 4th December 2012, 09:43 PM

Primary circuit on the carby blocked?

I assume points gap is good?

Did you swop the condensor?

What about the coil?

**JDNSW** · 5th December 2012, 05:58 AM

Originally Posted by vnx205

Manifold loose?

But I suppose the exhaust manifold would be spitting too if that was the case.

Inlet manifold gasket gone allowing air to leak in, giving a very lean mixture?

If it is good under load, it doesn't sound electrical unless it is intermittent.

Manifold is not loose and no signs of problems with the carburetter gasket.

John

**JDNSW** · 5th December 2012, 06:04 AM

Originally Posted by jakeslouw

Primary circuit on the carby blocked?

No, had the carby to bits, and in any case this is hardly compatible with normal operation at full throttle.

I assume points gap is good?

Not having feeler gauge with me, didn't check but it looked OK and was OK when I serviced it less than 100km earlier.

Did you swop the condensor?

Don't carry a spare, and they are not available off the shelf in Dubbo. But again, unless it is an intermittent problem, it seems unlikely, although possible, that the performance is unaffected at full throttle.

What about the coil?

Same applies to the coil as to the condenser.

John

schuy1 · 5th December 2012, 06:05 AM

Does sound very much like a fuel related problem, blocked idle jet? An electrical fault does not really give those symptoms . They tend to be more go or completly not go across the whole rev range
Cheers Scott

**debruiser** · 5th December 2012, 06:12 AM

Actually I have heard of the coil giving these types of problems.... Not that I'm saying it HAS to be that....

If your interested. Dad bought a brand new 78 or 79 Game and from new it used to go great until it got hot, then it would stop.... couldn't start it for a while, then would start easy and go well for a while. He took it back heaps of times and they kept changing stuff (sparks, leads, distributor etc) but not the coil.... one day it stopped and the apprentice came to help him out (on the side of the road somewhere too far to walk home) and they swapped in a coil from the apprentice's car and no more problems (they tried the LR coil in the Appretice car - wouldn't start)

**JDNSW** · 5th December 2012, 06:43 AM

Originally Posted by schuy1

Does sound very much like a fuel related problem, blocked idle jet? An electrical fault does not really give those symptoms . They tend to be more go or completly not go across the whole rev range
Cheers Scott

My first thought was blocked idling jet (low speed jet to use Rover terminology), but this was why I pulled the carby to bits, and it was all OK.

I have seen cases of ignition problems mimicking fuel problems though, so these cannot be ruled out.

John

schuy1 · 5th December 2012, 07:01 AM

Originally Posted by JDNSW

My first thought was blocked idling jet (low speed jet to use Rover terminology), but this was why I pulled the carby to bits, and it was all OK.

I have seen cases of ignition problems mimicking fuel problems though, so these cannot be ruled out.

John

OK yes saw that you had pulled the carby apart After I posted

So thats my theory done.

Could be electrical, a broken wire flexing and intermittently connecting , although strange it went at normal revs Nothing harder than to track a fault like that down!

Good luck!
Cheers Scott

PS What type of carby is it?

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