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1982 el camino struggles to go into high rpms


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Stephunn
New User

Mar 23, 2022, 9:26 PM

Post #1 of 9 (789 views)
1982 el camino struggles to go into high rpms Sign In

My problem is i have an El Camino that has trouble going into higher rpms. for example when i'm sitting with the car at idle, and in neutral or park, and i push down the throttle all the way, it backfires through the carburetor, and then dies immediately. or it backfires and then slowly starts building up rpms again until idling. I have no clue what it could be because it idles fine and drives fine otherwise, it just has issues with going into the higher rpms. I took it to a mechanic when i first got it because it would barely run at all and he got it working pretty good but mentioned that the stall converter is too small/weak for the engines power ( I think it might be the stock stall converter). I have the idle set to about 1000 rpm and when i shift into drive it drops to about 500 rpm. if i dont let the car warm up completely it dies when shifting into gear. so that might be a reason why it wont reach higher rpms while in drive. but im not sure why the car backfires when flooring it at idle. should i advance or retard my timing? If its needed I can also figure out what my timing is tomorrow when there is daylight. I haven't tried anything to fix it yet, not sure where to start.


here is some information i can give out at the moment
it was engine swapped with a 350 small block chevy. It has a comp cam, ill just copy down what is on the form card thingy since i'm not knowledgeable on what it all means...

Intake Exhaust
Valve adjustment HYD HYD
-Gross valve lift .480 .480
duration @
-.006 tappet lift 280 280
Valve timing open
@ .006 int: 34 BTDC 66 ABDC
THESE SPECS ARE FOR CAM INSTALLED
@ 106.0 INTAKE CENTER LINE
Intake Exhaust
duration @ .050 230 230
Lobe lift .3200 .3200
lobe seperation 110.0

Thats the cam information, next is the carb it has a Holley carb in which i don't have much info for, i'm pretty sure its 550 cfm but i could be wrong. i can look at product numbers if needed. I can get any other info if it is wanted tomorrow. other than that i'm not really sure what other information to give, i'm new to this stuff so any help is appreciated.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 24, 2022, 4:23 AM

Post #2 of 9 (758 views)
Re: 1982 el camino struggles to go into high rpms Sign In

One thing you may want to check for is an exhaust restriction usually due to a plugged up Catalytic Converter.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Stephunn
New User

Mar 24, 2022, 5:56 AM

Post #3 of 9 (742 views)
Re: 1982 el camino struggles to go into high rpms Sign In

it doesnt have cats, could the mufflers get plugged up like cats or no? It has multiple exhaust leaks that i haven't gotten to fixing. whoever had it previously did a terrible job welding the exhaust, theres holes in the welds that has carbon deposits all over it.... its really bad.


(This post was edited by Stephunn on Mar 24, 2022, 5:58 AM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 24, 2022, 6:34 AM

Post #4 of 9 (735 views)
Re: 1982 el camino struggles to go into high rpms Sign In

It's possible but highly unlikely.

You just need a good engine guy to diagnose it. Someone that is very familiar with old school systems are carburetors.

The fact that this engine is not stock will further complicate the issue.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Mar 24, 2022, 1:48 PM

Post #5 of 9 (717 views)
Re: 1982 el camino struggles to go into high rpms Sign In

Quick read of this highly desirable car/truck thing with engine that dates back to the 1950s - bullet proof design was hard not impossible to smog laws make it work. That took BILLIONS of bucks to do so they ever ran at all now al messed up with fairy tale things to make it like what you could have off the shelf new if older.
Bummer - it's not going to be easy it's been ruined IMO and perhaps only IMO,


Tom



Stephunn
New User

Mar 24, 2022, 4:26 PM

Post #6 of 9 (705 views)
Re: 1982 el camino struggles to go into high rpms Sign In

not sure what you are saying here, but if you are saying its been ruined because someone took the original engine out then okay, theres nothing i could have done about that... I just want it to run well so i can use it and not have it sitting in a garage for the rest of its life to rust away.


318m0par
New User

Apr 27, 2022, 10:48 AM

Post #7 of 9 (217 views)
Re: 1982 el camino struggles to go into high rpms Sign In

My advice would be to advance the timing.
Here to offer help but always enlist the help of a professional if you feel necessary.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 27, 2022, 11:30 AM

Post #8 of 9 (209 views)
Re: 1982 el camino struggles to go into high rpms Sign In


Quote
My advice would be to advance the timing.


That is a ridiculous response. You do not just randomly move timing with no idea what it is now or what it is moved to.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Apr 27, 2022, 2:04 PM

Post #9 of 9 (200 views)
Re: 1982 el camino struggles to go into high rpms Sign In

You can use a vacuum gauge in line for ACTUAL manifold vacuum on this or should be able to.

That's telling of timing and for exhaust restriction if so. Without load at a normal idle speed ~600-650 maybe smidge more read vacuum and again NO LOAD at about 2,000 RPM should read the same.

If much lower than 18 (sea level) or floating at the higher RPM that's info means it's not happy say what it does. If lower at higher RPM is an exhaust restriction - any reason tell us what you find go from there,

T







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