Have 99 silverado with a miss on two cylinders at any RPM,

Asked by Jul 20, 2014 at 12:40 PM about the 1999 Chevrolet Silverado 1500 3 Dr LS Extended Cab SB

Question type: Maintenance & Repair

Drove to work Friday morning with truck running great. When I left work Friday afternoon it
almost wouldn't run. Have spark on both cylinders, but don't know if it's at the right time.
No trouble codes other than "300". What else can I check.

4 Answers

65,705

I have a 99 silverado all so,had same issue,check your intake gasket,sound,s like it may be bad,if that is not the problem,check compression on the two cylinder,s that are missing.

already checked compression and it was fine. checked vacuum at master cylinder (only place I could find) and it seemed good also. no drop in vacuum when engine RPM went up. The cylinder it's missing on are 1 and 2. I loosened the plug wires and with engine running, remover wires one at a time. No difference in engine when 1 or 2 wires were pulled off. Just borrowed a NOID light to check PCM signal. Anything else I can check?

65,705

Was there fire at the 1 and 2?

14,365

Two things needed for ignition, fire and fuel. If you have spark, check the injectors or the module directing them. You may have congestion or crud. Check the fuel filters to see if there is any undesirables in them and or replace them anyway since you have them off. If you have spark when it is suppose to spark, and the plugs are good, I has to be the fuel. One and Two are on the opisite sides of the engine, so the two fuel rails are not the issue, but the injectors may be, or electronic malfunctions. Make sure the wires are secure to the plugs and injectors.

Your Answer

Add photo

Related Questions

Silverado 1500

Looking for a Used Silverado 1500 in your area?

CarGurus has 181,195 nationwide Silverado 1500 listings starting at $250.

ZIP:

Search Chevrolet Silverado 1500 Questions

Chevrolet Silverado 1500 Experts

#1 John Carson
John Carson
Reputation 2,350
#2 Rowefast
Rowefast
Reputation 1,930
#3 Silverado_owner_2006
Silverado_owner_2006
Reputation 1,650
View All

Related Models For Sale

Used GMC Sierra 1500
761 Great Deals out of 69,110 listings starting at $1,850
Used Ford F-150
2,068 Great Deals out of 207,301 listings starting at $1,499
Used Dodge Ram 1500
411 Great Deals out of 10,835 listings starting at $1,400
Used Toyota Tundra
436 Great Deals out of 34,736 listings starting at $2,990
Used Toyota Tacoma
472 Great Deals out of 41,615 listings starting at $1,995
Used Chevrolet Tahoe
556 Great Deals out of 31,361 listings starting at $1,500
Used Chevrolet Camaro
244 Great Deals out of 31,183 listings starting at $369
Used Ford F-250 Super Duty
329 Great Deals out of 46,256 listings starting at $1,450
Used Chevrolet Silverado 2500
5 Great Deals out of 245 listings starting at $4,900
Used Ford Mustang
543 Great Deals out of 45,840 listings starting at $1,999

Used Cars For Sale

2017 Chevrolet Silverado 1500 For Sale
194 Great Deals out of 128,693 listings starting at $21,284
2016 Chevrolet Silverado 1500 For Sale
129 Great Deals out of 5,584 listings starting at $18,895
2015 Chevrolet Silverado 1500 For Sale
178 Great Deals out of 7,962 listings starting at $12,950
2014 Chevrolet Silverado 1500 For Sale
264 Great Deals out of 10,585 listings starting at $11,300
2013 Chevrolet Silverado 1500 For Sale
141 Great Deals out of 4,947 listings starting at $7,650

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.