So I've fought with my 96 K2500 Suburban for a while now trying to figure out the rough idle/miss. Finally changed the ignition coil and ignition control module as well as the IAC. Now it idles at about 600-700 rpm and it idles smooth, no more miss. It's still starting a little hard though especially when it's cold. Could this be a worn distributor gear? That and the timing chain are the only ignition/timing related parts I haven't replaced. I've got a wobbling balancer or crank pulley that I need to replace and plan on doing the timing chain when I do those.
Hard start Vortec big block
- Thread starter 8T7K5
- Start date
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454cid
Sooper Pooper
Check the fuel pressure. I never checked mine, so I don't know how low it was. I replaced the pump because it would stop wanting to turn on after being parked. Apparently it had been slowly dieing for years, and I didn't know it. I assumed my hard start issue was the injectors because they're reputed to be a bad design. The new fuel pump and wiring harness pigtail made all the difference. A new starter took care of the rest... that started to become unreliable too. I still have the original injectors. I think my fuel pressure is around 55psi now.
I bought these and so far so good at about 1600miles.
https://www.ebay.com/itm/Reman-Genu...8x-Fuel-Injectors-GM-454cid-7-4L/263017673619
https://www.ebay.com/itm/Reman-Genu...8x-Fuel-Injectors-GM-454cid-7-4L/263017673619
I was looking at those too. Dumb question, but do you have to remove the fuel rail to put them in or is it something that can be done without going that far?
