Backfire and loses power

Asked by Aug 03, 2017 at 03:06 PM about the Chevrolet Silverado Classic 1500

Question type: Maintenance & Repair

What could cause the 1989
Chevy Silverado to backfire
and loose power when
going up hills or when a load
is put on it. I have checked
the firing order and is ok
changed plugs and wires,
I'm stumped. Could it be the
coil pack?

3 Answers

560

I'd use a gage and check proper fuel pressure. If your tbi fuel injection, 9--13 psi. Also, check fuel injector spray pattern, just make sure both injectors are spraying fuel. If this is a carbed engine fuel pressure is usually a little less. Is it backfiring out the exhaust or intake, can you tell? I don't know liter size of engine? I can't rule out other issues.

4,505

put some carb cleaner down the throttle

4,505

check the distributor and rotor for any pitted terminals

Your Answer

Silverado Classic 1500

Looking for a Used Silverado Classic 1500 in your area?

CarGurus has 19 nationwide Silverado Classic 1500 listings starting at $6,499.

Postal Code:

Chevrolet Silverado Classic 1500 Experts

  • #1
    tenspeed
    Reputation
    70
  • #2
    COMETGUY61
    Reputation
    60
  • #3
    Tom Torres
    Reputation
    50
View All

Related Models For Sale

Used Chevrolet Silverado 1500
173 Great Deals out of 10,271 listings starting at $2,230
Used GMC Sierra 1500
239 Great Deals out of 10,212 listings starting at $1,775
Used Ford F-150
632 Great Deals out of 9,065 listings starting at $1,995
Used Dodge Ram 1500
42 Great Deals out of 452 listings starting at $3,488
Used Chevrolet Silverado 2500HD
24 Great Deals out of 1,229 listings starting at $4,995
Used Chevrolet Silverado 1500HD
5 listings starting at $3,995
Used Toyota Tacoma
25 Great Deals out of 1,201 listings starting at $4,444
Used Chevrolet Colorado
32 Great Deals out of 2,129 listings starting at $1,999
Used Chevrolet Tahoe
5 Great Deals out of 773 listings starting at $4,200
Used Toyota Tundra
33 Great Deals out of 1,375 listings starting at $5,871
Used Chevrolet Silverado Classic 2500HD
7 listings starting at $12,900
Used Chevrolet Silverado 2500
6 listings starting at $7,999
Used Nissan Titan
37 Great Deals out of 496 listings starting at $6,950

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.