383 hesitation please help
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383 hesitation please help
I have restored a 1970 charger with a 383 for an engine and 323 posi rear end. The engine will hesitate and sometimes die off the line but, on a rolling start will start pulling about 2500. We have converted it over to electronic ignition with the mopar performance conversion kit, installed a mopar performance cam, mopar performance aluminum intake, holley street avenger 770 carb and a set of headman elite headers. The engine is fresh with 906 heads that have been ported and gasket matched. We have been messing with it for about a year now and everything we do wont fix it. Any advice?
Mopar Lover
Joined: Sep 2008
Posts: 514
Likes: 7
From: South Point OH
Do you have a stall convertor? From what I'm seeing with the way your engine's built, you won't start making power until 2000+ rpm. Next thing, if that Holley is a 770 cfm, it looks too large for off the line at a low rpm. If you have it stalling to at least 2400 rpm, and it still does that, first try the accelerator pump, make sure it works. If that's all good, my next suggestion would be to try a smaller cfm carb, with vacuum secondaries.
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as far as the transmission goes we have only installed a shift kit. it also has a stock torque converter. We have tried different accelerator pump cams, and shooter nozels and none of them seem to make a difference. Holley told us to use a smaller power valve and use different secondary springs but that didnt help either. We are kinda wondering if we dont have timing issues, has there been any problems with the mopar performance electronic ignition kits?
Mopar Lover
Joined: Sep 2008
Posts: 514
Likes: 7
From: South Point OH
If it was mine, first thing I'd do would be to get a stall convertor, figure about 2400-2800 rpm. It will only stall to the point your engine makes torque to overcome it. That will let your engine "flash" to that point, probably the 2400 rpm point, before it engages. That would put you more in your power band, and let you use the power you're making, where you're making it. Driving it normally, you wont notice much difference, but when you nail it, that's when the convertor will flash. You will notice a slight decrease in gas mileage, if that worries you.
As far as the ignition kits, I've used a few, and never had any problems, but there's always that chance.
As far as the ignition kits, I've used a few, and never had any problems, but there's always that chance.
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Ok, tonight we tried a couple of other proven carbs and had the same back fire through the carb. So i decided to try the old points Distributor. So we put the points distibutor in and wired it up to the coil and then the coil directly to the battery set the timing by ear and no more hisitation. So i took it on a test drive and didnt miss a lick. So now it leaves us with why the electronic ignition wont work right. Any ideas on that?
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Simple things first. Check your distributor. Make sure the plate and pick-up coil aren't loose. Are the floats in your Holley correctly set? Check the carburator accelerator pump. With the engine off and cold look down the throat of the carb as you pull back on the throttle. You should get a nice even spray. You might also be getting too much of a spray. Can you back off on the pump adjustment. Too much fuel will cause the car to bog off the line.
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garthed
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Sep 5, 2013 05:58 PM
