95 chevy 5.7 TBI

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  #1  
Old 09-21-08, 08:05 PM
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95 chevy 5.7 TBI

I have a 1995 chevy truck with the TBI 5.7 it runs great but it feels like it,s crossing up cyl's or loading up at a even speed.when i take off it seems ok but once i level off it sorta sputters persay,there are no code lights on.any help will be
wonderfull
 
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  #2  
Old 09-21-08, 08:26 PM
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check out your plug wires, plugs. distributor cap for tracking. fuel filter.
murphy was an optimist
 
  #3  
Old 09-21-08, 08:38 PM
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Ok will check the wires and plugs, they are old the wires look good but I just bought the truck . it runs great but as I said it kinda scurges while driveing at any speed
thanks,,,
 
  #4  
Old 09-21-08, 08:48 PM
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If this truck has the flat style distributor cap (plug wires come off the side instead of the top) then I would replace the cap and distributor rotor first. It's pretty cheap and those flat caps are real bad to get internal cracks that you CANNOT see but that will cause a cross-fire condition.

How many miles does the truck have on it?
 
  #5  
Old 09-21-08, 08:57 PM
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it has the old style cap wires on top,it has 170,000 miles on it.
I drove it from Ok. two days ago did fine just felt the motor seem to be surging no poping or dieing just felt it,I can ease the throttle to 1500 RPM's and it's like it's loading up or something...
 

Last edited by clevecan; 09-21-08 at 09:00 PM. Reason: wrong miles
  #6  
Old 09-21-08, 09:05 PM
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with only 17000 miles on it you definitely should not be in need of a tune up (plugs or wires). I would just look them over to make sure there is no wires touching exhause manifolds, etc. Might also pull a plug just for good measure to see how it looks. It SHOULDN'T be worn out, but you might look to see if it is black or anything. The one thing that I would definitely reccommend before you do anything else is to change your fuel filter...it may very well be clogged up if at some point someone put some bad gas or something in there (probably/maybe before you bought it). It is a cheap and simple thing to do and even if that doesn't fix the problem you will at least have avoided the common mid-90's fuel pump failure for now. If you are REALLY budget minded and don't want to spring for the $10 fuel filter unless you ABSOLUTELY need it you can take it off and blow through it (make sure you blow through it the same direction the gas would flow) and if there is much resistance at all then REPLACE it. If you turn blue trying to blow through it, then there is a good chance that was your whole drivability problem to begin with.
 
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Old 09-21-08, 09:11 PM
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Sorry Fallen it's 170,000
 
  #8  
Old 09-21-08, 09:20 PM
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ha! well, now then that makes a little more sense. I was certainly wondering how you found a '95 chevy pickup with such low mileage.

Yah, with that many miles on it the possibilities are pretty much endless. I would DEFINITELY be checking those plugs and wired over very very carefully and I would DEFINITELY check out that fuel filter ASAP. As I said, fuel pump failures on these model trucks are about as common as STDs in hookers.

Also, another thing you might want to look into is the oxygen sensors. Those things can cause some tricky problems if they start acting up. As far as the check engine light not coming on, are you sure there is even a light bulb in there? I can't tell you HOW MANY TIMES when I was working as a mechanic that I had a vehicle come in that had been "fixed" before only to find that the check engine light bulb had been removed or *ahem* tweaked with a good pair of pinching pliers.

When you first turn the key on before starting the truck the check engine light should come on for a few seconds and then go off...if it doesn't then it is either removed or not working correctly.

What you described in your original post sounds like an ignition problem to me, but that's just an initial guess. If it is an ignition misfire (or even crossfire) then it should throw a code, though...so I dunno. As I said, on a truck that old there are MANY MANY possibilities that it could be....especially with it being a chevy. *lol* (not my favorite brand)
 
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Old 09-21-08, 09:33 PM
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Ok I just looked check engine light works and the check guages light too when i turn the key on.this truck looks showroom clean but is high miles so being the ac plugs look old i'll do a tune up on it and change the gas filter.i'll do the filter first just to see if thats the prob.it did just have a flowmaster ex installed last week and brakes and power st pump.before i bought it,thank you all for the info,
 
  #10  
Old 09-21-08, 10:03 PM
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no problem, let me/us know how it turns out.
 
  #11  
Old 09-21-08, 10:08 PM
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Originally Posted by clevecan View Post
it did just have a flowmaster ex installed last week
Just as a side note, you might make sure they didn't do something stupid like rod out (or leave off completely) the catalytic converter when they were working on the exhaust. Modern fuel injected/computerized vehicles WILL NOT RUN properly without the catalytic converter. Also they could have damaged an O2 sensor while working on the exhaust...just something else to think about.

It SHOULD have thrown a code for any of the above mentioned conditions, but sometimes it takes a while for the code to trip....and sometimes things that SHOULD trip the check engine light simply don't.

Good luck.
 
  #12  
Old 09-21-08, 10:31 PM
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the catalytic converter is on it and the O2 seems to look ok,I ask him if in fact if they messed with the catalytic converter and he said no just a muffler replacement.
I'll let you know what I find.
thanks,,,,,
 
  #13  
Old 09-22-08, 04:22 PM
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Ok guys, I just put a new dist.cap,plugs,rotor,still the same i guess the gas filter will be next....
 
  #14  
Old 09-22-08, 07:39 PM
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Originally Posted by clevecan View Post
Ok guys, I just put a new dist.cap,plugs,rotor,still the same i guess the gas filter will be next....

Did you also replace the plug wires?
 
  #15  
Old 09-22-08, 07:43 PM
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run a can of bg44k through the fuel system also, you could be experiencing some issues with the injector spray pattern.

Hydraulic Floor Jack: used for lowering an automobile to the ground after you have installed your new brake shoes, trapping the jack handle firmly under the bumper
 
  #16  
Old 09-22-08, 08:30 PM
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No fallen the parts store only had cheap ones thought i'd wait and get some tomrrow,
And being the other made no driffrence it seems to be gas related,
 
  #17  
Old 09-22-08, 09:34 PM
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if a faulty plug wire is your problem then changing the distributor cap and spark plugs certainly would NOT make any difference. That is not to say that your problem is definitely not gas related, I merely want to point out that such conclusion is based on faulty premesis.

change your plug wires and your fuel filter and then we'll go from there.

Check your air filter too. Not likely to be the problem, but if it is VERY stopped up it is a possiblility. It's not a bad idea to check the thing every now and then anyway. =o)
 
  #18  
Old 09-22-08, 10:10 PM
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got it will do,I did replace the air filter but old one was clean.
thanks for your kindness..
 
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