at3reg98

I'm having issues getting the 307 to run right in my '83. If I stab the gas it'll stall out as if it's flooding, occasionally shooting fuel up through the carb (once in a while it'll backfire through there). Even a gentle tap of the gas will upset things and come close to stalling it or it will stall it out. It used to do this while driving and I thought it was a carb issue but now it isn't drivable since you can't touch the gas without a problem.

There are no vacuum leaks and it's throwing no codes. The car has 143k on it and the only thing I can come up with is the timing chain is slack. Everything else is in tune, carb, dist cap, wires, etc. The plugs fouled once but I cleaned them best I could and it doesn't miss. Timing issue or did I miss something?

Octania

It is surely time to replace the timing set.

at3reg98

I did some reading and did the test of turning the crank while watching the distrib rotor. I was able to turn the crank some 2-3" each way before the distributor rotor began to move! That can't be right. It must've jumped time from starting it up to move it around the driveway..

Charlie Jones

See my post here; https://classicoldsmobile.com/forums...tml#post559706

frankr442

I once thought I had either a worn timing chain or camshaft, lack of power, popping and spitting fuel out the carb. Turned out to be a clogged catalytic converter.

at3reg98

I thought that too but right now the crossover pipe is removed from the engine and it still runs this way..

olds 307 and 403

An exhaust leak will cause a pig rich condition. You need exhaust on the car.

OLD SKL 69

Wow, that is way too much. I just did the timing chain in my 85 Riviera (307 Olds) with 160k mi and I had about 1/2 of that amount of slack.

at3reg98

The crossover being off is part of another failing project I started (the broken studs are impossible to deal with), it did this before then with no change. It definitely has that much slack in it, I double checked since I read your post and it's definitely close to 3" as I pull the belts and watch the pulley and rotor. That's got to be the problem.

nsnarsk65cutlass

3"for sure thats a problem it probably jumped and is retarded.

at3reg98

Yeah I moved it out of the garage and it could barely move under it's own power. Time to start making a list of what's needed, tools and all.

joe_padavano

Whether it's the cause of your problem or not, 143K miles on the original timing set is living on borrowed time (pun not intended ).

Once the chain is replaced (hint: you MIGHTASWELL put a new water pump on while it's apart), then you can see if the CCC system is adjusted properly. Also, having the exhaust disconnected will cause the O2 sensor to read falsely, compounding any other problems.

MDchanic

Just to be clear, you say you can turn the crank 2-3 inches each way (or 4-6" total, I ASSume).

Since rotation is measured in degrees and not in linear units, and since a long wrench handle will move farther than a short handle through the same number of degrees, exactly where are you measuring these 2-3"?
Are you measuring at the balancer / timing scale, at the end of your wrench, or somewhere else? And if it's at the end of your wrench, how long is the wrench?

- Eric

nsnarsk65cutlass

"As i pull the belts and watch the pulley and rotor" that tells me 3" is too much. line it up on #1 compression stroke and check rotor position with the cap.Simple as that.

at3reg98

Joe: Strangely it appears it was replaced once before but nothing else was touched, go figure. That o2 sensor appears to be original and is stuck in place, I often wonder if it's even working right. Never got a code but it's old. If I had my way I'd yank the whole mess and drop in an emissions free Olds 350, even a 330.

Great point Eric. I know it isn't the correct way, but I was watching how far the alternator pulley moved each way, marking it and the housing as a reference point. I wanted to turn at the crank but I don't have the adapter for it (three bolt harmonic). Truth be told I'm still learning about these things..

MDchanic

Okay, but that doesn't answer the question, how far does the crank turn before the rotor turns?

- Eric