I have a 87 Monte Carlo with a 76 383. It has Edelbrock RPM intake, holley 650, comp cams 268h, speed pro flat top hypers, 882 heads (i know they suck), 9.4:1 comp, TH350, B&M Torquemaster 2500 stall, 8.2 3.73 rear end.
Anyway, i have had this problem since i built it. At about 1700-2000 rpm when i slowly press the gas (as not just punching it all the way to WOT) it hesistates and then picks up and goes. It basically sounds like your clearing your throat, huh.... uhhh. It also has a small hesitation at idle at the same rpm's so it not to do with the drive train or load on the engine. I have the timing at 14* initial and 34* total. So i thought it was the shooter nozzles either blocked or too small so i got a set of 31's and put it in, no difference. Then i went to a 35 and still none. Then i figured it was timing so i tried to advance it a little and at first it got a little better, and then as i advanced it more it got worse. So it was a little better but not right. The distributor is a GM HEI 65k. Then i got to thinkin that maybe the secondaries are not kickin in soon enough or maybe too soon.
This is buggin the hell out of me and ive been tryin to get it sorted out for like two months now, at least. Sometimes the car will stall if i ease into a linelock. It seems like the car only wants WOT. Any ideas?
I have a 87 Monte Carlo with a 76 383. It has Edelbrock RPM intake, holley 650, comp cams 268h, speed pro flat top hypers, 882 heads (i know they suck), 9.4:1 comp, TH350, B&M Torquemaster 2500 stall, 8.2 3.73 rear end.
Anyway, i have had this problem since i built it. At about 1700-2000 rpm when i slowly press the gas (as not just punching it all the way to WOT) it hesistates and then picks up and goes. It basically sounds like your clearing your throat, huh.... uhhh. It also has a small hesitation at idle at the same rpm's so it not to do with the drive train or load on the engine. I have the timing at 14* initial and 34* total. So i thought it was the shooter nozzles either blocked or too small so i got a set of 31's and put it in, no difference. Then i went to a 35 and still none. Then i figured it was timing so i tried to advance it a little and at first it got a little better, and then as i advanced it more it got worse. So it was a little better but not right. The distributor is a GM HEI 65k. Then i got to thinkin that maybe the secondaries are not kickin in soon enough or maybe too soon.
This is buggin the hell out of me and ive been tryin to get it sorted out for like two months now, at least. Sometimes the car will stall if i ease into a linelock. It seems like the car only wants WOT. Any ideas?
My first guess is to verify that your fuel bowl float levels are set at the right spot. Also - verify by manually giving the carb a little bit of gas - do the shooters immediately spray fuel?
That was one thing i did check that the fuel bowls are right below the eyesight and the shooters are shooting properly. I also adjusted the pump arm. I'm not sure about the vacuum though.
That was one thing i did check that the fuel bowls are right below the eyesight and the shooters are shooting properly. I also adjusted the pump arm. I'm not sure about the vacuum though.
Buy a $20 vacuum gauge attached to a manifold vacuum source and have a buddy put it in gear while holding the brakes - tell us your vacuum reading while in gear and not in gear, ok?
On of the first places I look when working on a bog is ignition advance. If
you have the total advance set for best torque, sometimes you must limit the
centrifugal and add more initial and the bog goes away.
Well join the club. I had three different engines with three different cams and three different carbs and they all had the off idle stumble. The worst was with a holly. Your holly will work I am sure. I currently have even worse problems since I have went to a roller cam I have problems with my truck will idle fine but once its poped into gear if your not putting your foot on the gas pedal it will start to studer then quit. I will have to give quickfuel to sort mine out but someone did tell me to see if your off idle stumble if a lean or rich stumble and adjust your squirter. If that does not work you will have to try a lot of other things. Good luck hope you get the kinks worked out.
Eric
mightycarlo10, There is a chance your accelerator pump is not setup right. You have to check where the plastic cam is set #1 or #2 setting. Set the cam to #2 and make sure there is no slack on the lever. Also you can get the plastic cam kit. Try to select the cam that will work for you. I found out the blue cam works the best at #2 setting. Hope this help :thumbup:
I think i know what my problem is. Does that little plastic thing sit in between the arm that goes to the accelerator pump and the actual throttle lever? Because if so thats it. I bought this carb from a friend and it has a spring that attaches that arm and throttle lever.
The little plastic cam should go on the same shaft the primary butterflies are on.. the shaft that all the throttle linkage is attached to (right behind the throttle linkage on the shaft, its probably hard to see). The spring between the 2 lever arms for the pump is adjustable to take the slack out of the linkage.. slack/ sloppy is bad. Stock gap is about .012 if you have feeler gauges. the cams control how much and how fast the accelerator pump works.
I know about the slack adjuster spring. But on mine theres another spring. I think somebody just used it as a return spring. I did see the cam so i'll have to do some tinkering on that. Thanks
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Hot Rod Forum
2.2M posts
175.6K members
Since 2001
A forum community dedicated to hot rod owners and enthusiasts. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more!