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Username Post: Car dies when I mash the accelerator        (Topic#357176)
LSS1333 
Poster
Posts: 67

Reg: 05-13-15
07-10-19 03:55 PM - Post#2770400    

383 idles pretty good. Pretty sure I have a small vacuum leak, but I sold my house and I need to move the car this weekend.

Engine has not really been driven, but started and let idle while trying to sort things out.

Drove around the block for the first time just now and when I ease on the gas pedal it is okay, however, as soon as I tried to really give it some more it immediately cut out. I let off the pedal and just eased back home and everything was okay.

It also cuts out when I try to quickly rev the motor.

Any ideas how to get this right?





 


acardon 
Ultra Senior Member
Posts: 11291
acardon
Loc: DFW TEXAS
Reg: 03-25-05
07-10-19 04:21 PM - Post#2770401    
    In response to LSS1333

Not much information to go by. Does it have vacuum advance? Check timing.

Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


 
IgnitionMan 
Valued Contributor
Posts: 3671

Reg: 04-15-05
07-10-19 04:53 PM - Post#2770402    
    In response to LSS1333

Please outline engine package, drive train, complete timing specifications used, and carburetor/intake setup.

We can help from there.

Does sound lean, and that can be caused by a significant vacuum leak, but, we have NO information on how the engine is configured to go from, except it is a 383.



 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17391
grumpyvette
Age: 71
Loc: FLORIDA USA
Reg: 03-16-01
07-10-19 06:14 PM - Post#2770410    
    In response to IgnitionMan

as stated , not enough info, but it sounds like the carb accelerator pumps not working correctly

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


 
LSS1333 
Poster
Posts: 67

Reg: 05-13-15
07-10-19 07:41 PM - Post#2770418    
    In response to grumpyvette

Found the problem. The accelerator pump arm on my carb is short and just barely fits under the accelerator pump spring and bolt assembly. Because the pump arm is so short it slips to the side of the bolt head instead of being under it.

It appears if I use a slightly larger bolt it would work perfectly.

Does anyone foresee a problem with changing to a slightly larger bolt to make up for a short arm?



 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17391
grumpyvette
Age: 71
Loc: FLORIDA USA
Reg: 03-16-01
07-11-19 06:32 AM - Post#2770451    
    In response to LSS1333

posting several clear pictures would sure help here

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


Edited by grumpyvette on 07-11-19 06:33 AM. Reason for edit: No reason given.

 
LSS1333 
Poster
Posts: 67

Reg: 05-13-15
07-11-19 10:05 AM - Post#2770473    
    In response to grumpyvette

Not sure how to post pics on this site. However, I was simply able to slightly bend the spring/bolt over to properly align it with the accelerator pump arm. Seems to be working. THanks again for everyone's help



 
IgnitionMan 
Valued Contributor
Posts: 3671

Reg: 04-15-05
07-11-19 10:49 AM - Post#2770475    
    In response to LSS1333

"Found the problem. The accelerator pump arm on my carb is short and just barely fits under the accelerator pump spring and bolt assembly. Because the pump arm is so short it slips to the side of the bolt head instead of being under it."

Sounds like a Holley carb. No need for a longer bolt, and, the linkage arm from cam to pump lever can be reposition'd to hit the lever correctly by literally judiciously bending the arm, either on the pump lever end (end with the sprung bolt), or pump cam end.





 
LSS1333 
Poster
Posts: 67

Reg: 05-13-15
07-11-19 02:36 PM - Post#2770483    
    In response to IgnitionMan

Thank you ignitionman. You were 100% correct!



 


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