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lost my power

lost my power

Postby brownbear [OP] » Feb 24 2011, 11:27pm

95 silverado 5.7L tbi with lots of aftermarket parts. I just got it running again, I changed the IAC, ignition coil, plugs, and orings for the injectors. I finally got the leak to stop, the fuel pressure lowered and now when I drive it, it has no power anymore. I could sit and a light and punch it and it would peel out nicely. Now it boggs really bad and when on the highway it just doesn't want to move. I have the pedal floored and it's not doing anything. It doesn't have that varooom when something opens up and plants you in the seat. The speed will go up, but it takes a lot longer than it ever did. I don't think I could pass a yugo right now. I took it up to over 80mph, but it's really slow. Something is wrong and I'm not sure what. I can check for vac. leaks, but it seems like more than that. It starts up fine and it idles fine and it moves fine when your not mashing the pedal. It will drive fine when you want to cruise, but won't perform beyond that. This truck was pretty fast and now it's a dog. What can I do to get my truck back?
Original Poster
brownbear
Firing on 4 cylinders [L1]
Firing on 4 cylinders [L1]
Posts: 48
Topics: 12
Images: 4
Joined: Jan 25 2011, 10:18pm
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: ohio
Year: 1995
Make/Model: Chevrolet Silverado
Variant: SS
Extra Info: 5.7L
Group Membership:
Registered users

Re: lost my power

Postby Alphatonic » Feb 25 2011, 4:02pm

Never underestimate the faults of a vacuum leak!! Are you getting any codes? Hows it act on cold start?
1994 Silverado K/1500 Z71
155,000m
5.7L
Automatic
Off Road/Tow Package
Previously owned by a very clean Hack-Mechanic

All automobiles are pieces of shit. Chevy's are just the ones worth fixing:)
User avatar
Alphatonic
Firing on 4 cylinders [L1]
Firing on 4 cylinders [L1]
Posts: 48
Topics: 8
Images: 2
Joined: Feb 22 2011, 1:13am
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: Louisville
Year: 1994
Make/Model: Chevrolet Silverado
Extra Info: K1500 Z71 350 Auto
Group Membership:
Registered users

Re: lost my power

Postby brownbear [OP] » Feb 25 2011, 6:49pm

no service lights have come on yet, so I don't know of any codes unless I take it to advance auto. Hot or cold it starts up just fine, nice smooth idle around 600rpm, it just lost all of it's power, like something is holding it back. It never bogged this bad ever.....
Original Poster
brownbear
Firing on 4 cylinders [L1]
Firing on 4 cylinders [L1]
Posts: 48
Topics: 12
Images: 4
Joined: Jan 25 2011, 10:18pm
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: ohio
Year: 1995
Make/Model: Chevrolet Silverado
Variant: SS
Extra Info: 5.7L
Group Membership:
Registered users

Re: lost my power

Postby Alphatonic » Feb 25 2011, 9:48pm

You don't have to take it anywhere to get the code. Look under your steering wheel down to were the dash panel stops you will see a 0bd1 plug.(pictures on google) two rows of little holes with metal contacts inside. if you take a paper clip and jump the two top far right squares- turn the key to the on position but dont start it, it will give you the code. the list of codes can be found on google anywhere. you should get 12 three times then if it senses the problem, another code or more. blink-pause-blink-blink means 12. blink-blink-pause-blink means 21. get it? This may tell you the problem right away it might not tell you s*** but its definitely a good place to start. I'm having a much similar problem with my 94. Im working on fixing the third code to pop up now. Youd think I had a beer bong hooked to the throttle body dumping the gas in.
1994 Silverado K/1500 Z71
155,000m
5.7L
Automatic
Off Road/Tow Package
Previously owned by a very clean Hack-Mechanic

All automobiles are pieces of shit. Chevy's are just the ones worth fixing:)
User avatar
Alphatonic
Firing on 4 cylinders [L1]
Firing on 4 cylinders [L1]
Posts: 48
Topics: 8
Images: 2
Joined: Feb 22 2011, 1:13am
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: Louisville
Year: 1994
Make/Model: Chevrolet Silverado
Extra Info: K1500 Z71 350 Auto
Group Membership:
Registered users

Re: lost my power

Postby brownbear [OP] » Mar 01 2011, 11:14pm

I sprayed and checked for leaks with no luck. Not sure where to go from here, except see if autozone will check for codes. I have no check engine lights, so I don't know if they will or not.
Original Poster
brownbear
Firing on 4 cylinders [L1]
Firing on 4 cylinders [L1]
Posts: 48
Topics: 12
Images: 4
Joined: Jan 25 2011, 10:18pm
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: ohio
Year: 1995
Make/Model: Chevrolet Silverado
Variant: SS
Extra Info: 5.7L
Group Membership:
Registered users

Re: lost my power

Postby lzn197 » Mar 02 2011, 5:07am

Ok I'll bite. Plugged catalytic converter?
Gordon
2004 Chevrolet Silverado Extended Cab Z71
Semi-retired Master Mechanic
User avatar
lzn197
ASE Certified
ASE Certified
4x4 High Mode [L3]
4x4 High Mode [L3]
Posts: 1814
Topics: 6
Images: 22
Joined: Apr 01 2010, 3:45pm
Years of membership: 4 years of membership4 years of membership4 years of membership4 years of membership
Location: Central Michigan
Year: 2004
Make/Model: Chevrolet Silverado
Extra Info: K1500 5.3L Z71 EX
Group Membership:
Automotive Technicians
Registered users

Re: lost my power

Postby brownbear [OP] » Mar 02 2011, 1:32pm

how would I check something like that??????????
Original Poster
brownbear
Firing on 4 cylinders [L1]
Firing on 4 cylinders [L1]
Posts: 48
Topics: 12
Images: 4
Joined: Jan 25 2011, 10:18pm
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: ohio
Year: 1995
Make/Model: Chevrolet Silverado
Variant: SS
Extra Info: 5.7L
Group Membership:
Registered users

Re: lost my power

Postby lzn197 » Mar 02 2011, 2:22pm

The first thing I would look for is evidence of exhaust backing up through your intake. It usually puts black soot on the clean side of your air filter. They also make a tool that screws into your oxygen sensor hole and you attach a pressure gage................when you accelerate the engine and see back pressure, it indicates a problem. I cannot remember how much pressure is bad, maybe 1.5 pounds or more. You can also look at manifold pressure (vacuum) as you drive and if it stays real low as you accelerate slowly it may indicate a problem. Obviously if you floor it then the vacuum will drop, thats normal as it accelerates. You also could have the converter removed for a test to see if the performance improves. Do NOT remove the oxygen sensor and drive it to see if it gets better because the hot exhaust will burn and melt underhood items near the open exhaust hole. I hope this helps!
Gordon
2004 Chevrolet Silverado Extended Cab Z71
Semi-retired Master Mechanic
User avatar
lzn197
ASE Certified
ASE Certified
4x4 High Mode [L3]
4x4 High Mode [L3]
Posts: 1814
Topics: 6
Images: 22
Joined: Apr 01 2010, 3:45pm
Years of membership: 4 years of membership4 years of membership4 years of membership4 years of membership
Location: Central Michigan
Year: 2004
Make/Model: Chevrolet Silverado
Extra Info: K1500 5.3L Z71 EX
Group Membership:
Automotive Technicians
Registered users

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