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Author Topic:   1989 454 chevy crew cab dually
2nd2none
Dirt Forum Champ
Total posts: 755
posted June 30, 2004 02:30 PM  
I've bought this truck last year to haul with and it is in good shape. First time I hauled my open trailer to the track I noticed that this fuel injected 454 has no power. Also it only gets about 5-6 mpg even without the trailer, it just s ucks the gas and lacks power. I've installed a new fuel filter, plugs and wires without any results. The truck idle's excellent, but when I'm taking off from a stop sign/light it hesitates until it gets some rpm's then cleans out. The check engine light doesn't come on so I dont know if the computer has any codes in it, nor do I know how to pull them either.

Anyone have any suggestions on what might be wrong with this thing? It's also my daily driver and going 20 miles to work one way is starting to get expensive
(1/4 tank of fuel just going to work and back home)

[This message has been edited by 2nd2none (edited June 30, 2004).]

ryan
Dirt Forum Champ
Total posts: 776
posted June 30, 2004 05:30 PM  
Now I don't know if your truck would have this. My 91 Explorer had a fuel regulator go out and it would get about 9-10mpg as opposed to 16-18. I think it was $65 but with gas at 2 bucks a gallon its was well worth it. What about your air filter? Don't know if either of these are a posibility but I figured it was worth a mention.

2nd2none
Dirt Forum Champ
Total posts: 755
posted June 30, 2004 06:48 PM  
air filter's good, how did you test your fuel regulator to tell that it was bad?

stockcar5
Dirt Forum Champ
Total posts: 578
posted June 30, 2004 08:47 PM  
check the egr valve...i've had quite a few that open to soon and cause a lag.
also check fuel pressure...tbi motors should run at least 12-16psi

luke

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ryan
Dirt Forum Champ
Total posts: 776
posted June 30, 2004 09:13 PM  
I pulled off the vacumn line and it had fuel dripping out the port. My little fix it manual also suggested to check there first. Did you ever unhook the battery for 10 min. to make the computer reset. Just throwing out ideas here I try to stay away from street vehicles. Too many **** wires, hoses and **** in my way.

hamer36
Dirt Maniac

Total posts: 196
posted July 01, 2004 08:46 PM  
check with your GM dealer. My neighbor's truck acted the same way and it was a regulator (expensive but he had extended warranty) that goes out all the time. Also, when filling up, don't add any gas once the nozel shuts off at full.Gas will back feed through the venting system (the thing that looks like a black coffee can under the hood) and screw things up.

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