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

10,375

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?

10,375

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 151,123 nationwide Silverado 1500 listings starting at $1,500.

ZIP:

Search Chevrolet Silverado 1500 Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Chevrolet Silverado 1500 Experts

#1 John Carson
John Carson
Reputation 1,760
#2 Silverado_owner_2006
Silverado_owner_2006
Reputation 1,490
#3 tenspeed
tenspeed
Reputation 1,420
View All

Related Models For Sale

Used GMC Sierra 1500
1,020 Great Deals out of 59,988 listings starting at $1,299
Used Ford F-150
3,031 Great Deals out of 207,234 listings starting at $1,990
Used Dodge Ram 1500
531 Great Deals out of 13,027 listings starting at $1,800
Used Toyota Tundra
672 Great Deals out of 27,897 listings starting at $2,500
Used Toyota Tacoma
709 Great Deals out of 31,641 listings starting at $2,750
Used Chevrolet Tahoe
859 Great Deals out of 27,932 listings starting at $1,700
Used Chevrolet Camaro
437 Great Deals out of 40,503 listings starting at $3,500
Used Ford F-250 Super Duty
438 Great Deals out of 42,882 listings starting at $2,750
Used Chevrolet Silverado 2500
5 Great Deals out of 282 listings starting at $3,995
Used Chevrolet C/K 1500
1,071 listings starting at $1,250

Used Cars For Sale

2017 Chevrolet Silverado 1500 For Sale
61 Great Deals out of 88,093 listings starting at $19,077
2016 Chevrolet Silverado 1500 For Sale
268 Great Deals out of 11,496 listings starting at $15,992
2015 Chevrolet Silverado 1500 For Sale
267 Great Deals out of 7,110 listings starting at $15,977
2014 Chevrolet Silverado 1500 For Sale
473 Great Deals out of 10,716 listings starting at $12,500
2013 Chevrolet Silverado 1500 For Sale
294 Great Deals out of 6,213 listings starting at $8,995