truck

Asked by Dec 24, 2015 at 04:56 AM about the 1978 Chevrolet C/K 10

Question type: Maintenance & Repair

My father passed away and i inharited his
1978 c10 truck and i know i need tk fix the
timing it backfires but i dont know how to fix
the timing can anyone help me

10 Answers

106,435

Its notl typical a hard job but if you don't know much about cars then it would make sense to take it to a mechanic for repair a 78 chain should be a few hundred to repair, you can purchase the part on line..

2 of 2 people found this helpful.
49,395

Backfiring could be a bad timing chain or it could also be caused by the spark plug wires being on the wrong terminals on the distributor cap or at the spark plugs. The distributor could also be out of time. A compression test would help you determine if the timing chain was actually the problem.

26,185

AND IT COULD JUST BE A VALVE !!!

49,395

Could be a valve and a compression test would show if it were a valve or if the timing chain has slipped or broken. If it were a valve, it would most likely be an exhaust valve causing popping in the exhaust. If timing chain is broken pulling the distributor cap to see if the rotor is turning (while cranking the engine) would be the best way to determine if that was the problem.

72,375

Then there is the carburetor...And the fuel pump. A bad fuel pump could cause back-firing. I would check the fuel pressure, it should be 5.5 to 6.5 lbs. Timing chains on Chevy's don't ordinarily go bad. Just checking and setting ignition timing is all thats needed.

3 of 3 people found this helpful.
49,395

and the carb.... When the carb has full fuel bowls during start up it should run okay until it runs low on gas and that will also cause popping and backfiring. Of course it could be dirty or worn out too. If I had that truck here at the house I could probably tell you in 15 or 20 minutes what was likely wrong with it, but sitting behind this screen makes it a tough call.

72,375

Well then Bob, get out and venture a bit...

3 of 3 people found this helpful.
49,395

LOL, heck it's probably a long ways from Kansas. Everything is.

72,375

LOL...

2 of 2 people found this helpful.
68,725

A compression test will show if the engine has jumped timing, or a bad valve. If all cylinders test very low or zero it's jumped timing. If one cylinder tests very low or zero that cylinder has a bad valve. If it's backfiring like a gunshot out the exhaust, but only when you take your foot off the accelerator pedal, it's going to be the diverter valve for the A.I.R. (smog pump) system. HTH. -Jim

Your Answer

Add photo

Related Questions

  • truck 10 answers

    My father passed away and i inharited his 1978 c10 truck and i know i need tk fix the timing it backfires but i dont know how to fix the timing can anyone help me

    1978 Chevrolet C/K 10

    -

    Maintenance & Repair

  • Chevy truck 1 answer

    Truck runs great but when i turn it off it tries to start back up on its own. Doesn't do it all the time mostly after a good drive. Need help has anyone dealt with this?

    1982 Chevrolet C/K 10 Silverado Standard Cab SB

    -

    Maintenance & Repair

  • truck not turning over 2 answers

    I just bought a '68 c10 and it was running fine no problems, when I went to start it up the other day it had been left with the ignition left in on all the lights worked in the cab and exterior. i gue...

    1968 Chevrolet C/K 10

    -

    Maintenance & Repair

  • Truck won't start 4 answers

    I replaced fuel pump and fuel filter. Replaced starter and cylinode. But when I turn the truck off all fuel leaves the filter and it won't start if left sitting for a long period of time

    1986 Chevrolet C/K 10 Standard Cab SB 4WD

    -

    Maintenance & Repair

  • Truck stalling out in Drive and reverse 2 answers

    Recently started acting up on the road. Need help pretty fast any leads wI'll be taken. WHAT I GOT: 1976 CHEVY C10 350V8 AUTO. HOLLY CARB . RECENT WORK: CARB REBULID PROBLEM : the truck was run...

    1978 Chevrolet C/K 10 Custom

    -

    Maintenance & Repair

C/K 10

Looking for a Used C/K 10 in your area?

CarGurus has thousands of nationwide listings and the tools to find you a great deal.

Postal Code:

Shortcuts

Search Chevrolet C/K 10 Questions

Chevrolet C/K 10 Experts

#1 CaptPKelly
CaptPKelly
Reputation 680
#2 Rowefast
Rowefast
Reputation 370
#3 F_O_R
F_O_R
Reputation 360
View All

Related Models For Sale

Used Ford F-150
368 Great Deals out of 9,658 listings starting at $995
Used Chevrolet Camaro
766 listings starting at $2,500
Used Ford F-100
1 listing
Used Ford Mustang
9 Great Deals out of 1,263 listings starting at $1,000
Used Chevrolet Blazer
18 listings starting at $1,789
Used Chevrolet Corvette
658 listings starting at $4,450

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.