Loss of power
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Loss of power - 3/20/2008 5:03:43 AM
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ehawks
Posts: 11
Joined: 1/4/2008
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a while back our 98 blazer w/ 4.3 litre was suffering loss of power. i read on one of the posts that a guy rodded out his converter. ours was rattling so we figured it was bad and peices were blocking the exhast. I rodded mine out and no doubt the exhaust flow is better but we still have a consistent power issue. Gas mileage has consistently been down a bit but not too bad. The only code we have is one that says the catylist is below the level that it should be (no shi$^$^). Run and drives fine, the power loss is perplexing. Seems like the timing is consistelnly retarded. but no other codes.
Any ideas?
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RE: Loss of power - 3/20/2008 8:15:42 AM
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WolfPack
Posts: 3074
Joined: 10/30/2007
From: Raleigh, NC
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Replace the cat would fix the light.....
As for the loss of power, if you're thinking it's unrelated to the cat, it could be a fuel issue. A fuel pressure test would be a good start, making sure to watch the pressure for a few minutes and make sure it does not drop considerably.
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2000 Blazer 4d LS 4x4 - 265/70/15 General Grabber AT2s - Hunter Brush Guard - Surco Roof Rack with IPF 868s - 1.5'' Shackle + Tbar - 2'' BL
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RE: Loss of power - 3/20/2008 2:32:23 PM
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ehawks
Posts: 11
Joined: 1/4/2008
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This is a good suggestion. I tried to replace the fuel filter a few time but it just won't come off. I've been soaking the threads with penetrating oil a few times for the past month and no luck. Any ideas on how to get that sucker off?
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RE: Loss of power - 3/20/2008 3:17:32 PM
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rriddle3
Posts: 1555
Joined: 12/22/2006
From: Fort Worth,Texas
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Have you read this tutorial?
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2002 Blazer LS 4dr 2WD Auto Trans
Hypertech PP III Programmed
Flowmaster 50 Series Delta Flow Muffler, C6 Corvette Exhaust Tip
TYC Elegante carbon fiber tail lights
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RE: Loss of power - 3/26/2008 9:12:28 AM
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ehawks
Posts: 11
Joined: 1/4/2008
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Yea this would be helpful but my biggest problem right now is getting those treaded connections loose.
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RE: Loss of power - 3/26/2008 11:36:50 AM
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portcqb
Posts: 410
Joined: 3/13/2008
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Yah the connections are really difficult to get off on your back and you dont really want to force it too much and break that nut off. If you tried numerous times it might be better just to take it to a garage and let them get coated in gas.
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1997 Olds Bravada AWD 4.3L Auto ~35,100mi(high idle time), CAI, Quad Beam Moded Mod
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RE: Loss of power - 3/26/2008 12:25:50 PM
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rriddle3
Posts: 1555
Joined: 12/22/2006
From: Fort Worth,Texas
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Personally, I had zero trouble getting the two nuts apart by using two wrenches. My issue came with getting the fuel lines out of the mounting bracket. Not to be insulting, but are you sure you're turning the nut the right direction?
_____________________________
2002 Blazer LS 4dr 2WD Auto Trans
Hypertech PP III Programmed
Flowmaster 50 Series Delta Flow Muffler, C6 Corvette Exhaust Tip
TYC Elegante carbon fiber tail lights
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RE: Loss of power - 4/7/2008 9:35:28 AM
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ehawks
Posts: 11
Joined: 1/4/2008
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WOW! turning right direction, that is pretty funny. Yea I was, finally got a small pipe wrench out and trashed the nut but it came off. I coated the threads with antiseaze compound when i put it back on. Still drives the same way even after the new filter. It runs very smooth and does not sputter even when giving it a lot of gas going up a hill. Just does not have power. Seems like the timing is retarded but still no code.
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RE: Loss of power - 4/7/2008 10:12:21 AM
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lennyblazer
Posts: 1988
Joined: 5/6/2007
From: Appleton, WI / Houghton, MI
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The only thing that I can think of that would cause retarded time, would be corrosion build up on the rotor or distributor cap. When was the last time the cap and/or rotor, wires, and sparkplugs replaced? This could be part of your powerloss and fuel economy situation. But I would think if something in those parts was bad that you would have sputtering or uneven idle.
As far as the fuel pressure testing, I am not sure exactly how to do that, but I believe you can get a gauge from an autoparts store and then hook it up to the test port on the back of the fuel rail (as mentioned in my tutorial listed above). I am not sure what the fuel pressure is supposed to be, but running a search for fuel pressure on the forum should get you some information on that. It could be an issue with the fuel pump, but without it sputtering (not having enough fuel) I would say its not the fuel pump (atleast not yet).
I would run the fuel pressure test and post back on the results of that and the last time you replaced any of the ingition parts (spark plugs, wires, distributor, rotor). Also if you did replace the spark plugs what kind did you use. I have heard from most people that our trucks only like the AcDelco Platinum plugs (thats what I replaced mine with, so far no problems (7k miles on them so far).
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-Lenny
4.3L Auto. 3.73Gears
http://www.cardomain.com/ride/2358267
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RE: Loss of power - 4/7/2008 5:05:31 PM
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Yamitude
Posts: 43
Joined: 9/20/2007
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I would perform throttle body cleaning and a MAF cleaning, and also clean the egr valve. You may need an egr gasket, and a can of combustion cleaner for the egr and throttlebody, and sensor safe cleaner for the Maf sensor. If it doesnt fix the problem, it is still good maintenance. Also dont rule out the Map sensor, the specs for testing are here somewhere, i found it on a search a while back. Good luck.
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