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Old 07-25-2005, 10:41 PM
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92 454 lack of power/misfires

Anybody got any suggestions why a 92 454 TBI would lay down when you mash the throttle, and if you let up on the pedal a little it accelerates more? It also sounds like it is back firing through the carb as well a couple times. Timing checks out at 4 degrees advance. firing order is correct. idles fine, but is seriously lacking power going uphill, at temp. any suggestions appreciated. Just replaced fuel filter. arrow points to engine.
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Old 07-25-2005, 10:56 PM
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survey says "bad sensor!" What do the plugs look like, is fuel economy (like there was any in the first place...) down?

MAF and 02 would be the first place I'd look, how recent is the problem?

K
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Old 07-25-2005, 11:09 PM
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This is where it gets a little tricky. I just replaced the tranny. had to put in an updated harness. Wondering if it may be PCM related. I replaced the o2 sensor about a year ago. I am not getting any codes or check engine light, but it is bogging big time and has popped back through the intake a couple of times. It idles fine though. maybe fuel pump?
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Old 07-26-2005, 05:31 AM
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Quote:
It idles fine though. maybe fuel pump?
My first thought... Also if you do replace the pump make sure its a good quality brand and that its for a 454 and not a SBC they are different... Funny I have a brand new in the box laying around and no use for it... (AC Delco)
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Old 07-26-2005, 05:43 AM
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I agree check fuel pump pressure even a couple pounds low will hurt. Also they 454 around that year are known for plug wires going bad.
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Old 07-26-2005, 07:25 AM
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Thanks for the input. It was acting up a little before the transmission job, but correcting itself after 15-30 seconds. after warming up it would run fine. shut it off and restart it would idle at about 350rpm and then jump back to normal idle after 15- 30 sec. I've triple checked the firing order and timing, so I think it is safe to eliminate that. It has a new fuel filter. I just spent $2500+ on the tranny, I am afraid to ask what a pump is worth...
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Old 07-26-2005, 08:12 AM
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Not much, just the pump isabout 65.00 CAD.
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Old 07-26-2005, 08:30 AM
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Thanks dude.
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Old 07-28-2005, 07:53 AM
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Hey bumpstick,
what is the number of the AC Delco pump you have?
I am having a debate with my local parts supplier that the EP 386 is not the big block pump. It shows up as a generic replacement for V-6 and small block V-8's. In my haynes manual it says that the pump pressure for a BBC should be 26-32 psi and this pump tops out at 22 or something close to that. I even tried GM and they offered the same AC pump. I do not want to have to drop that damn gas tank again!
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Old 07-28-2005, 04:58 PM
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Nope try part number EP377...

That number EP386 is for the V6 and up to the 350`s...
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Old 07-28-2005, 05:38 PM
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I F'n KNEW IT!
man do I hate arguing with parts Guys! what's the application? and by the way .... Thanks!
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Old 07-30-2005, 04:45 PM
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Update on this situation-
I put in the EP377, which showed in the book as 94-98 7.4 litre (454). It was actually $25 cheaper. (May have been a nicer parts guy..... I managed to persuade him to look up the pump number instead of refusing to sell it to me because the book he had said otherwise..) Running great, although I gotta come clean.... I had to pull the distributor to get better access to the bellhousing bolts. When I put the distributor back in and timed it I forgot to disconnect the Tan/black stripe wire on the firewall, so the timing was 10 degrees retarded! could explain the lack of power, but the fuel pressure was weak prior to replacement. The timing would expain the slight backfire I was experiencing sporatically. anyway, maybe someone else may benefit from my mistakes
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