did tune up now backfires

[Bowiemontecarlo86]

Hello all I have a question about a 2001 blazer xtreme 4.3ltr . My cousin had like a misfire sometimes while it was running . So we checked the spark plugs and determined they where in need of replacement . So we decided to do a full electrical tune up . Put new wires ,plugs,rotor,cap. The plugs are ac-Delco and they where gapped 0.050 . But the rad support said to gap them 0.060. So I gapped them accordingly. Well we replaced all that and now when we start the truck it backfires out of the exhaust . Strong fuel smell and blowing some fuel out the exhaust .

my question is what could be causing this problem? Should I have just left the plugs at 0.050 ?

any help will be appreciated for sure ty .

 

[GhettoRacingKid]

double check the wires that they are on and the firing order is correct.

If not I would close up the gap a bit. your probably not getting a good burn.

I don't remember what years but I know the ones with the spider injection they get cracks in the intakes which causing problems

 

[Fox80]

.010 difference in plug gap wouldn't cause any issue, are you sure you have the firing order correct on the new wires? Popping in the exhaust is usually a cylinder firing when the exhaust valve is open, so double check everything. The "spider" intake injector set-up is on the multi port motor 4.3l easily noticed by the neon orange "Vortec" on the intake cover.

 

[Bowiemontecarlo86]

I don't think this motor had the spider injection system. I think my cousin has checked the firing order . I'll make sure and double check that myself .

 

[Bowiemontecarlo86]

Ok found a firing order had my cousin recheck and he has 1and 3 mixed up. Now will that have done anything harmful to the engine?

 

[Fox80]

No it won't hurt anything, people do far worse things than that to a motor everyday

 

[Bowiemontecarlo86]

Ok ty for the help guys problems fixed and running great