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aawk
New User
Nov 21, 2006, 1:22 PM
Post #1 of 3
(1750 views)
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93 chev p/u power loss
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I have a 93 chev 1500 4.3l p/u. While towing a heavy trailer I have noticed a problem with power loss. When the gas pedal is depressed from 50% or more the truck will have poor accelleration then all of a sudden will kick in and operate normally. when I let off the gas it will do the same thing when I accelerate again. I have had no code signal. I have just had to replace the ignition module, cap rotor and wires. I believe the problem is with the fuel injectors, the truck has 200,000 kms on it, fuel pump is running but I do not know at what pressure yet. I think the injectors make an obvious ticking noise. I feels like not having the secondaries on a 4bbl, then having them kicking in intermittently. The engine runs fairly smooth for its age. Am I on the right track? Can a person dissassemble and clean injectors as they are quite expensive?
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steve01832
Veteran
Nov 21, 2006, 6:07 PM
Post #2 of 3
(1739 views)
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Re: 93 chev p/u power loss
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Does this happen only when you are towing?
Steve
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aawk
New User
Nov 21, 2006, 6:59 PM
Post #3 of 3
(1737 views)
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Re: 93 chev p/u power loss
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No, It happens all the time, it is more noticeable when towing as the need for full throttle is greater. Normally I do not get into a situation where I require more than 50% throttle. It seems like it is not getting enough fuel, the more I open the throttle it loses more power, ie. leaning out, then it will just start to accelerate and run smooth and strong. On big hills I would be down to 2nd gear as 3rd would not pull at all, If I hit hills at 110+kmh in 4th It will pull strong or at least maintain my speed, can't use 5th unless I am going over 120kmh If I require any power. I have had to shift down going downhill with a load on the truck and a full trailer just to maintain speed downhill. I know I was asking alot of the little V6 but there is a definite intermittient problem. I am not a qualified mechanic but have had alot of experience with chev trucks. I thought about ignition problems but there is not much more to replace that would cause an on again/off again problem. Like I said, If it was my old '78 with the edelbrock I would swear the secondaries were'nt functioning properly.
Thanks for the reply, I am stumped and do not want to start replacing the wrong parts. I have tried that type of diagnosing before and it is expensive.
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