LS1 spits,sputters,backfires,fouls plugs

5

Asked by Oct 31, 2014 at 09:23 AM about the 1999 Chevrolet Silverado 1500 3 Dr LS Extended Cab LB

Question type: Maintenance & Repair

I have a 87 monte carlo did a engine transplant put  ls1 5.3 N it ran fine before I purchased it, now after I changed the intake cause the engine came out of truck the intake was to tall 4 hood 2 shut hood.But now after install it spits,sputters,backfires and fouls plugs, seems like it loads up on fuel then sounds like a shotgun going off as it backfires,also have gas in oil I changed it like 4 times now I also have 2 push the gas down 4 it 2 start, and for it to stay running, but after its ran for about 10 minutes it fine purse like a cat. I have changed 02 sensors, spark plugs and its only doing it on the passangers side makes me think its a fuel injector any idias?

5 Answers

10,785

I would seem to think since you changed the intake manifold, it may not have seated properly when you installed it. It sounds like you have vacuum and intake issues. You may want to re-check your work, make sure head gaskets are seated properly and the front and rear seals. Re-torque intake bolts to the proper ft/lbs. Torque the bolts on the intake starting from the middle and working your way out.

5

well il do that, but just sent the injectors off to be cleaned, thinking it could be that, so if that was my issue why would it run fine once it warms up?

5

was doing research and found out I have 2 fuel pressure regulators 1 on fuel filter by gas tank, and one on injector rails don't know if that would over flow the fuel or not?

10,785

It's always tricky to tune an engine that is not original equipment. Just out of curiosity, what did you use for the engine control module? Did you pull the module out of the Silverado?

5

yes, but got it tuned to removed vats,delete egr, delete air pump, eliminate skip shift, and the different injectors and ran it with a painless harness, not so painless now lol

Your Answer

Add photo

Related Questions

Silverado 1500

Looking for a Used Silverado 1500 in your area?

CarGurus has 158,133 nationwide Silverado 1500 listings starting at $1,995.

ZIP:

Search Chevrolet Silverado 1500 Questions

Chevrolet Silverado 1500 Experts

#1 John Carson
John Carson
Reputation 1,870
#2 Rowefast
Rowefast
Reputation 1,630
#3 Silverado_owner_2006
Silverado_owner_2006
Reputation 1,580
View All

Related Models For Sale

Used GMC Sierra 1500
886 Great Deals out of 64,326 listings starting at $2,275
Used Ford F-150
2,399 Great Deals out of 208,537 listings starting at $895
Used Dodge Ram 1500
437 Great Deals out of 11,482 listings starting at $2,000
Used Toyota Tundra
543 Great Deals out of 31,895 listings starting at $2,800
Used Toyota Tacoma
537 Great Deals out of 37,291 listings starting at $2,900
Used Chevrolet Tahoe
609 Great Deals out of 27,570 listings starting at $600
Used Chevrolet Camaro
158 Great Deals out of 35,580 listings starting at $1,995
Used Ford F-250 Super Duty
390 Great Deals out of 47,134 listings starting at $400
Used Chevrolet Silverado 2500
12 Great Deals out of 290 listings starting at $3,995
Used Ford Mustang
302 Great Deals out of 45,096 listings starting at $2,000

Used Cars For Sale

2017 Chevrolet Silverado 1500 For Sale
16 Great Deals out of 101,571 listings starting at $18,779
2016 Chevrolet Silverado 1500 For Sale
192 Great Deals out of 6,908 listings starting at $17,025
2015 Chevrolet Silverado 1500 For Sale
211 Great Deals out of 7,401 listings starting at $13,475
2014 Chevrolet Silverado 1500 For Sale
370 Great Deals out of 10,917 listings starting at $10,960
2013 Chevrolet Silverado 1500 For Sale
200 Great Deals out of 5,573 listings starting at $7,900