Hard Start in 96 454. Please Help, this is a doozy

[brycebba]

I met with the mechanic yesterday and he retraced every step and found 2 bad plug wires and put some spares in and that *helped* but the big thing he found was one of my new injectors was bad! It was failing ohm tests I guess.

Long story short I sent the folks I bought the injectors from an email stating my frustration and they put 2 injectors in the mail for me yesterday and are refunding me for the trouble I have had. I'm very pleased with them and I hope that a replacement injector will finally put these problems to rest! Should get the injectors early next week

 

[Lordkay972]

Not sure if you mentioned what grade fuel you run or not, or if it even matters, but could a low octane fuel cause an issue like this?

 

[brycebba]

New injector is in and it runs great. Still has a little hard start issue but at this point I'm just glad it runs. If I ever look into it any further than I have and find a solution I will be sure to post it.

 

[Sierra]

What injectors did you buy from whom? Were they new or refurb? I ask this because I have a 454 that will need injectors.

 

[brycebba]

They are LS1 24lb injectors that are new from High Flow Fuels. They are an eBay seller

 

[brycebba]

The hard start issue has become worse since my last update and blows black smoke when it starts. I am so sick of these injectors! I ordered a set of blue Knights from fiveomotorsports. They cost a pretty penny but have a good warranty and likely are not crap like the ones I have now. I went with 19lb injectors and will run them with my 4 bar fpr for a 5.7 based on the suggestion from Kirk at fiveomotorsports.

They should get here tomorrow and I will put them in tomorrow night or Saturday.

I'm not sure if I will need a retune from black bear or not, I sent them an email and I'm just waiting to hear back.

 

[brycebba]

Hard start issue is completely gone and the truck runs awesome. That's what I get for buying eBay injectors so please make sure you are willing to take the risk if you want to go that route.

Blue Knights from fiveo rock! I sent my pcm back to black bear for a retune today. Hopefully then I can finally enjoy this truck working properly for the first time since I have owned it.

 

[88GMCtruck]

I'm glad to hear it's working. I've wondered if mine was the same thing I'm on a second set of injectors and I think I'm in the same boat as you.

 

[brycebba]

Yeah man, I just got to the point where it felt like everything else had been checked and rechecked and it was worth the risk of me buying more expensive injectors from a reputable company to see if it would fix the problem.

My 2 different sets prior were supposedly flow matched and perfect but they still ended up being the problem in less than a thousand miles

 

[brycebba]

Got the new tune back and the truck runs great! More importantly as far as annoyances go, it starts within a second no matter what. To think that all the times I thought I had ruled out the injectors at least one of them was the cause every time. I think by the end I had pulled the intake plenum off 8 times. I got good enough that I swapped the new good injectors in this last time and had it back together in about an hour