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post #1 of (permalink) Old 12-11-2003, 07:28 PM
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slow take off

Here is a question mabe someone could help me with. My 92 4x4 with a 4.3 EFI has a slow take off. It is almost like the motor is being started off in second or third. It is in all gears only at the low RPM's once I get past 2000-2500 RPMs she takes off like nothing is wrong. I have instaled a K&N air filter replaced the fuel filter changed the oil and filter. I haven't gotten to the spark plugs or wires but they are next. I have pulled the old ones and thay look like thay are in good shape. The enjectors spray nice and even. The exaust is shot and completely rusted away, could that be the source of my problem? or is it a six pack of weak spark plugs and wires?
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post #2 of (permalink) Old 12-12-2003, 12:31 AM
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Re: slow take off

When you say the exhaust is shot and completely rusted away, does that include the cats? If so this is definitely part of your problem. Engines need some back pressure to perform correctly, especially at low rpm. If you read up on heads and dual exhaust systems, they buy more HP in the higher rpms, but take away in the low RPM range.

Good luck
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post #3 of (permalink) Old 12-12-2003, 07:24 AM
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Re: slow take off

The exhaust may have something to do with it, as suggested earlier.

But another thing. What kind of tires are you running? Bigger than stock? If you have bigger-than-stock tires on there, you're not going to have all the power back at takeoff until you regear it. Most of those trucks came with either 3.42's or 3.73's. My old '98 would romp with 31's, but takeoff used to be a pain at times.
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post #4 of (permalink) Old 12-12-2003, 09:36 PM
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Re: slow take off

I am running stock tires and exaust. As far as I have looked it is rusted all the way up to the muffler at the least. It has a solid coating of rust all the way to the heads. I couldn't feel any soft spots past the muffler. I thought about going with a stock quiet exaust. I use the truck to do a lot of hunting and it will help me get in and out of the woods more stealth like. I also thought that I should just get a more of a preformance exaust to help get me the extra power I could use to get thair faster. I can't make up my mind yet, I also have to find a cheap shop to in stall it. I don't know that much about good exaust systems. What type would give me the best of both worlds quiet and power?
post #5 of (permalink) Old 12-13-2003, 06:35 AM
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Re: slow take off

That's funny....My wife has a '92 Bravada with the 3.42 axle ratio. I've noticed the same thing. I always blamed it on the "intake manifold tuning valve" until I used a scanner to turn it on, didn't help 1 iota. Also when I pull the boat (18' I/O) and the 4 place enclosed snowmobile trailer, it's a "gutless wonder" My friend has a '94 Bravada with the 3.73 ratio and with the boat on the back, you couldn't even tell it was on there. A little difference in ratio makes a lot of difference in power [img]images/graemlins/confused.gif[/img]
post #6 of (permalink) Old 12-16-2003, 01:18 AM
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Re: slow take off

check your timing a little advance may help
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