She suddenly will not idle for love or money.

[weejimmy]

she was out on a run and started popping back in the exhaust on down hill sections and then would not idle. She just dies unless the revs are up around 1500-2000, and then she runs very rough. Occasionally she spits back through the carb when she dies.

She has a fairly new Weber 38/38 and a 292 cam. I have cleaned out the carb and jets, not that there was anything apprently blocked. The carb was slightly loose when I checked it, but tightening it down didn't improve anything.

I have tried two sets of plugs with no difference.

The compression is 150 even accross all cylinders. - When I test it, hot with the throttle open, with a screw in tester, I get a little pulse on the first stroke, then up to 100psi then up to 150. The same on all cylinders.

She has a good spark, and a mechanical advance distributor with a relatively new cap and rotor and pertronix ignition. Timing looks OK.

What am I missing?

[morfiya]

well sounds crazy but check 2 make sure that alternator is charging,also make sure that the belt is tight, had a simiiar problem days ago.

[weejimmy]

I get 13v at the battery with the engine off. 14v at around 1500 rpm. Seems normal to me. Interesting idea.

[ChuckR]

i sorta had a similar issue-a few pop and backfiring and my car would not idle at all. i found that my vacuum plugs on my intake manifold had 'blown' off. chuck

[Harv]

Sounds like vacuum leak or a cloged idle jet.

My guess is cloged idle jet. A red neck trick would be to remove the air filter, rev the motor to the moon and then seal off the carb with your hand. As the idle falls close to idle, remove your hand (if you can) and see if there is any difference. It could suck what ever is blocking the idle jet through.

Clean the carb.

John

[PeterVarga]

look at your idle solenoid wire. It may have come off. And I think there

is a fuse that isolates it....I think #8 in a twelvepac block.

[TobyB]

Also, check your choke. If the linkage comes apart,

odd things happen.

But I'm thinking 'transition' jets, too. Or a sinking (sunk) float....

Pull the lid.

t

[daniswaytough]

you know, the best solution is to just fork out the time and money to stroke her. i hear that's the best way to fix it.