FrankieD61
The Stooge Called Slappy: Slappy'sAutoService
On my truck, (91 Chevy k1500 l, 350, TBI, not cat, no EGR) if I drive it when it's a little cold, at about 2-3000 rpm, it has a slight hesitation. Only when cold.
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EGR helps recirculate warm air back through a cold engine. It's been deleted. Go figure.
Connect a scan tool, find out what the computer is trying to tell you.
Verify fuel pressure after the fuel filter. How old is the fuel filter?
How old are the usual "tune-up" parts--cap, rotor, plug wires, plugs, PCV valve, vacuum hoses?
FIX THE EGR. Which may mean putting fresh cat(s) into the exhaust. No EGR means detonation, detonation means knock sensor going crazy, which means retarded timing and poor power/fuel economy.
that is not at all what EGR is for lol!EGR helps recirculate warm air back through a cold engine. It's been deleted. Go figure.
Have you made your exhaust match what a 350 would have come with? something tells me a 4.3 doesnt need as much exhaust but im just guessing. Also you only needed to swap your PROM (I assume, maybe pcm too) to get the right control maps and tables.I have a Snap-On MT2500 that I love, but I use the What's Up Display. Read the very last paragraph for more about that.
Fuel filter is brand new. It's a WIX.
Tune up parts are all brand new. All of it.
The truck is not pulling timing; my knock counts are 0 (my knock sensor checks out). As far as the computer knows, the EGR system never existed and knows how to operate the engine within it's perimeters with out it. If there is anything else about this, that I should know please let me know.
Okay, after reading through this entire thread, I'm realizing how stupid I really am...
So, some background: the truck has a 350 TBI. It originally had a 4.3l in it. I bought it with that but it was blown, so I swapped a 350 into it. I then realized that I needed to do something about the computer. So, I sent the old computer to "Bobr" over at DynamicEFI and he did his magic. I've been doing all of the tweaking with his built in "What's up Display." Which is basically the best "scan tool" you can get for these systems, IMO.
Your truck either has the best operating conditions that meant it never had much to handle Or you never noticed the truck pulling timing but the factory knock system possibly kept it in safe range( a good thing)I've EGR deleted quite a few of these trucks and I haven't had the first one cause knock nor kill fuel economy.
I'm not saying it can't but I find it interesting that some have had that sorta problem
Not bagging on you just wondering. some climates, some uses may see conditions that wouldnt need EGR lol.I've EGR deleted quite a few of these trucks and I haven't had the first one cause knock nor kill fuel economy.
I'm not saying it can't but I find it interesting that some have had that sorta problem
I second that. Walker makes a great hi-flow cat available on RockAuto - I don't feel my truck breathes much less at all than when it was straight piped w/ headers!!FIX THE EGR. Which may mean putting fresh cat(s) into the exhaust. No EGR means detonation, detonation means knock sensor going crazy, which means retarded timing and poor power/fuel economy.