I have a 2000 7.4L 454 CI L-29 engine in a Class C Dutchman. I've owned it since it had 20k miles on it and am now over 80k. It still has it's factory fuel injectors and fuel pressure regulator. I'm beginning to have hard start issues when the engine has been running and warmed up. It pops right off cold and runs good. Can anyone tell me if changing the injectors and fuel pressure regulator would help the hard start issue and if so, what injectors should I get.

It could also be your fuel pump relay not closing to turn the fuel pump on

Probably the fuel pressure regulator. My 97 7.4 has over 220,000 mi on it and it's not been annoying enough to hassle with. It still has the original injectors. If you want to check the fuel pump relay just switch it with one of the other relays with the same numbers on top.Have you had to replace the intake manifold gasket yet. Keep a eye on the coolant level. When the coolant level under the radiator cap starts staying about the same level as the top front passenger side of the block this will be the likely culprit. Some leak externally where you can spot some coolant that's leaked. Very good strong motor, wish they still made them. It's still hard to get used the high RPM's on these new small blocks for me.

Peg Leg wrote:Probably the fuel pressure regulator. My 97 7.4 has over 220,000 mi on it and it's not been annoying enough to hassle with. It still has the original injectors. If you want to check the fuel pump relay just switch it with one of the other relays with the same numbers on top.Have you had to replace the intake manifold gasket yet. Keep a eye on the coolant level. When the coolant level under the radiator cap starts staying about the same level as the top front passenger side of the block this will be the likely culprit. Some leak externally where you can spot some coolant that's leaked. Very good strong motor, wish they still made them. It's still hard to get used the high RPM's on these new small blocks for me.I'll try the relay swap you suggested, thanks. I do have to add coolant to it occasionally but I don't smell any coolant. Never have to add much, maybe just a qt. a couple times a year. I too like this engine. Plenty of grunt pulling my trailer over the mountains.

He he he... that is the CLASSIC 454 problem.I have a 2000 K3500 pickup with the 454 engine. I have the same issue.I've had my pressure regulator replaced - no help. The rest of the internet says its leaking injectors. I bought a set of replacement injectors online that wouldn't fit so I personally have decided to just deal with it. I find giving it a bit of gas when long cranking seems to help it.In researching the issue, I bookmarked the following links. I think you'll find them useful:http://www.chevytalk.org/fusionbb/showtopic.php?tid/257907http://www.fullsizechevy.com/forum/general-discussion/technical-maintenance/354448-454-do-yourself-fuel-pressure-regulator-someone-help.html

Captain Obvious wrote:He he he... that is the CLASSIC 454 problem.I have a 2000 K3500 pickup with the 454 engine. I have the same issue.I've had my pressure regulator replaced - no help. The rest of the internet says its leaking injectors. I bought a set of replacement injectors online that wouldn't fit so I personally have decided to just deal with it. I find giving it a bit of gas when long cranking seems to help it.In researching the issue, I bookmarked the following links. I think you'll find them useful:http://www.chevytalk.org/fusionbb/showtopic.php?tid/257907http://www.fullsizechevy.com/forum/general-discussion/technical-maintenance/354448-454-do-yourself-fuel-pressure-regulator-someone-help.htmlHey Capt...so if I'm reading your post correctly you never did change the injectors? If that's true maybe I can find someone on here that did change them, for that reason, and see what their outcome was. I'm not that annoyed with the problem enough to just start throwing parts at it.

454 Tune-up Question | Good Sam Community

12 Replies

Peg_Leg
Explorer
Apr 11, 2014
Probably the fuel pressure regulator. My 97 7.4 has over 220,000 mi on it and it's not been annoying enough to hassle with. It still has the original injectors. If you want to check the fuel pump relay just switch it with one of the other relays with the same numbers on top.

Have you had to replace the intake manifold gasket yet. Keep a eye on the coolant level. When the coolant level under the radiator cap starts staying about the same level as the top front passenger side of the block this will be the likely culprit. Some leak externally where you can spot some coolant that's leaked.

Very good strong motor, wish they still made them. It's still hard to get used the high RPM's on these new small blocks for me.
xcopiertech
Explorer
Apr 11, 2014
It could also be your fuel pump relay not closing to turn the fuel pump on

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454 Tune-up Question

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