How does it work when you put it in gear. You may have to raise the Idel for the auto trans.
I think i know the issue, but looking for help with bog down
- Thread starter TexasVol
- Start date
TexasVol
Active Member
Just now it did fine. I didn't get a tach read on it. I thought I had it good yesterday but after I ran down the road it was dying when I put it in gear. That's when I went and grabbed some vacuum line.
Someone will tell us but if I am not wrong you need about 13hundred Rpm for an Automatic transmission. At Idel. Just like with A/C car need a little more Idel RPM.
TexasVol
Active Member
So here is something else I don't understand. I went inside to charge my phone and type up my update post. It was idling around 1000. I was inside for 30-45 min. I just came back out and fired it up. It's idling at 900 now. I haven't done anything to it. Is that weather affecting it?
I put it in gear with my foot on the break and it was dancing around 650 rpms in drive. It felt low but it was fairly steady. I don't know if I'm just used to this thing idling high, and am gunshy now.
I put it in gear with my foot on the break and it was dancing around 650 rpms in drive. It felt low but it was fairly steady. I don't know if I'm just used to this thing idling high, and am gunshy now.
lewtot184
Well-Known Member
what kind of cam do you have in the engine to where it needs to idle so high?
Lefty71
Well-Known Member
I was thinking that too.....
Factory spec for '68 383-4bbl auto is 5° btdc @ 650 idle hot.
TexasVol
Active Member
As far as the cam, I don't know what's in it. I bought this car in March and have not torn it apart.
Yesterday afternoon it was fine at 850-900 but sounded like it was struggling below that.
lewtot184
Well-Known Member
That Chevy pcv valve may be a problem too. If it's cammed up the carb and ignition will need work. Those smog carbs really need some recalibration even with a stock cam.
Geoff 2
Well-Known Member
Post #24. Erratic idle speed can be caused by sticking weights/springs in the dist.
Will the engine idle smoothly in gear at 650 rpm? If it does, it has a stock or mild cam in it. This will be the starting point. If you have a vac gauge, measure the idle vacuum.
Will the engine idle smoothly in gear at 650 rpm? If it does, it has a stock or mild cam in it. This will be the starting point. If you have a vac gauge, measure the idle vacuum.
lewtot184
Well-Known Member
A vacuum gauge is a big help.
TexasVol
Active Member
It has been fine in gear at 650 for the last few days. I've driven it 3 or 4 times in the last week. No issues.
Port or manifold in idle? In gear?
Lefty71
Well-Known Member
Maybe Geoff_2 nailed it?? Sticky weights on the mechanical advance, and you were running the idle to high, which wasn't really compensating properly. Maybe touch base with Halifaxhops for a redo (or a good used one) now or in the off season and try again??
TexasVol
Active Member
I now think that this was my problem all along. The thing has been running like a top since I replaced the vacuum lines. (This and the care had too much timing in it.)
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