1986 Camaro 5.0l 305ci 5 speed manual: Gets too much fuel, not sure why.

Asked by Jan 18, 2015 at 10:06 AM about the 1986 Chevrolet Camaro Base

Question type: Maintenance & Repair

Alright, so provided there's no character limit on these questions, this is probably
gonna be a book, so bear with me! About a month ago, I was driving home from school
at about 3:30 on a dry, sunny (but cold, it's winter in Maine) afternoon. I noticed that
my car had been low on power that morning, and was really suffering when I left the
school, but I just assumed that it was because I hadn't let it warm up. I got about 5 or
so miles from the school, and as I was pulling away from a stoplight, the engine
almost refused to rev up... Now, normally, I can rev the nuts off the thing and dump
the clutch and she'll roll smoke off both tires until I let off... I tried that, just for giggles,
and it barely chirped one tire... So needless to say, i got about halfway through second
gear and pulled over, it just refused to go any higher than that... I popped the hood,
checked for any disconnected electrical or vacuum lines... I found nothing... So I
figured "screw it, what the hell", I jumped in and tried to drive away... As soon as I let
the clutch out the slightest bit, it stalled and I couldn't get it to start again... Now,
here's the confusing part... After the tow truck driver brought it to my work (which is
right next door to my house, very convenient), I gave the car about 10-15 minutes to
cool down and do it's thing... Then, I decided to try it again... I pumped the gas once,
cranked it over and it fired right up like it always did! BUT, it ran fine for only about 2
minutes... then, it gradually started to lose power, and eventually stalled after some
idiot (me) decided to try frigging with the throttle... It's been about 5 weeks now, but
every time after that, if you try starting it, it just cranks and cranks and cranks... If you
pump the gas 5 or 6 times, and hold your foot on the floor, it'll kick the starter out and
"run"... It's not a healthy kind of running, but it fires on it's own... If you can jump from
the driver's seat to the engine bay fast enough and finesse the choke and throttle, it'll
ALMOST idle... All this leads me to believe it's a fuel problem... I replaced the rotor
and cap the week it died, figuring maybe it had weak spark... That wasn't the
problem... I rebuilt the Rochester Quadrajet (Quadrajunk) carburetor about 2 weeks
ago, and that made no difference... Now, I'm not sure if I did that rebuild correctly... I
followed the instructions as best as I could, but I'm a 16 year old high school kid, and
that's the first carburetor I've ever rebuilt... It's running EXACTLY the same as it was
though, so I'm somewhat confident that I rebuilt it correctly... I'm pretty much out of
ideas here guys... If anyone has any idea of what it could be, I'd love to hear them...
Any help or suggestions would be greatly appreciated!!

1 Answer

68,705

A couple of things come to mind. First and for most is the automatic choke. It's electric and was troublesome from the get-go. Will it run if you hold the choke plate open by hand? The choke coil is heated by a tiny electric heater inside the choke coil housing. They ALWAYS burned out after a few years of use. The other thing that comes to mind is carburetor icing. This occurs in cool damp weather. Your Camaro was originally equipped with 2 systems to combat carburetor icing. The first and most visible is a "thermac" air cleaner assembly which pre-heats air going to the carburetor. Using a vacuum motor on the snorkel the air coming in is maintained at about 100°F under all conditions. The second is a heat riser system which uses an EFE (Early Fuel Evaporation) valve on the right (passenger's side) exhaust manifold. When cold the valve is closed and directs hot exhaust gases up and around the base of the carburetor to warm the throttle plates and further eliminate ice forming on the throttle plates. When you pulled the carburetor for the rebuild you should have noticed a channel running around the front part of the mounting spot on the intake manifold. That channel always gets clogged up with carbon and needs to be cleaned out. As for the carburetor rebuild, since this is your daily driver, send it out to be rebuilt. The Rochester Quadrajet is one of the most complex carburetors ever built. It has over 100 parts and, since your Camaro is an '86 model, it's computer controlled. Whatever you do, do NOT buy a rebuilt unit at the local auto parts store and turn in the old one for the core charge. I can guarantee it WILL be wrong! Carburetors have specific model numbers for specific vehicles. Rebuilt units are lumped together in aftermarket cataloging and are very rarely correct. I work at NAPA and personally won't sell a customer a rebuilt carburetor. I direct them to a rebuilder who will rebuild the old one. I'll sell the kit only but not the whole unit. HTH. -Jim

Your Answer

Add photo

Related Questions

  • 1986 Camaro 5.0l 305ci 5 speed manual: Gets too much fuel, not sure why. 1 answer

    Alright, so provided there's no character limit on these questions, this is probably gonna be a book, so bear with me! About a month ago, I was driving home from school at about 3:30 on a dry, sunny...

    1986 Chevrolet Camaro Base

    -

    Maintenance & Repair

  • 1983 or 1985 Camaro. (not sure on the year) 4 answers

    Alright here"s the deal. we got a camaro that didnt run when we bought it. i started by replacing the battery to see if it was just a battery problem or something deeper. after replacing the battery t...

    Chevrolet Camaro

    -

    Maintenance & Repair

  • Chevy Camaro manual transmissions brakes not working sometimes? 19 answers

    Hi,I just bought a new chevy camaro convertible with manual transmission. Yesterday night I took it for ride and I was taking it outside my garrage. There is steep slope which I was climbing slowly....

    2012 Chevrolet Camaro LT1 Convertible

    -

    Maintenance & Repair

  • 1994 camaro v6 fuel pump not working. 2 answers

    I checked voltage to relay while key on 12.6v on term 30 from plug to relay.I jumper across 30 to 87 on plug,( direct to fuel pump)and ign pcm fuse blows everytime.Does this mean pump is bad? Also ...

    1994 Chevrolet Camaro Base

    -

    Maintenance & Repair

  • why does my camaro surge at lower gears and drive fine at highway speed? 1 answer

    My Z28 Camaro has trouble, in gears 1-4, at sustaining a constant speed without surging or lunging? At highway speeds, 55+ mph, it has no trouble. Why is this???

    1995 Chevrolet Camaro Z28 Convertible

    -

    Maintenance & Repair

Search Chevrolet Camaro Questions

Chevrolet Camaro Experts

#1 dandyoun
dandyoun
Reputation 1,740
#2 carGrrl
carGrrl
Reputation 1,170
#3 Tom Demyan
Tom Demyan
Reputation 1,080
View All

Related Models For Sale

Used Ford Mustang
682 Great Deals out of 44,475 listings starting at $1,500
Used Chevrolet Corvette
218 Great Deals out of 22,161 listings starting at $3,750
Used Dodge Charger
535 Great Deals out of 28,457 listings starting at $2,500
Used Ford F-150
2,088 Great Deals out of 192,330 listings starting at $290
Used Chevrolet Impala
545 Great Deals out of 35,509 listings starting at $899
Used BMW 3 Series
1,020 Great Deals out of 31,415 listings starting at $1,000
Used Jeep Wrangler
274 Great Deals out of 15,790 listings starting at $3,795
Used Pontiac Firebird
15 Great Deals out of 764 listings starting at $2,995
Used Honda Accord
1,049 Great Deals out of 66,932 listings starting at $1,000

Used Cars For Sale

2018 Chevrolet Camaro For Sale
2,369 listings starting at $22,495
2017 Chevrolet Camaro For Sale
28 Great Deals out of 15,786 listings starting at $19,940
2016 Chevrolet Camaro For Sale
40 Great Deals out of 1,690 listings starting at $17,550
2015 Chevrolet Camaro For Sale
80 Great Deals out of 2,464 listings starting at $13,900
2014 Chevrolet Camaro For Sale
69 Great Deals out of 2,304 listings starting at $11,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.