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1996 Chevrolet Truck Run rough and no power

Tiny
LALFAN1960
  • MEMBER
  • 1996 CHEVROLET TRUCK
  • 5.7L
  • V8
  • AUTOMATIC
  • 172,567 MILES
Its had a new distributer plugs and wires. No light codes. No misfires but sounds like it is. Cam retard on 0. Front 02 sensors average between 87-880mv. Long term bank 1at 1.6. Bank 2 at-13.3 any good place to start. Thanks
Saturday, June 6th, 2015 AT 1:54 PM

20 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuel pressure with a gauge auto parts rent it. Should be 60-66 psi then check for a vacuum leak. These are basic steps that should be performed with initial diagnosis. Should only drop to around 55psi when shut off.
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Saturday, June 6th, 2015 AT 3:35 PM
Tiny
LALFAN1960
  • MEMBER
  • 37 POSTS
Didnt check for fuel pressure. A shop did the other work n had to something to the distributer to get 0 can retard. Something to do with grinding on it because it gets turned to far n hits where the clamp goes. Guess when chain is getting a little lose? Tried making smoke gun for leaks. Just seen very little once by back corner passenger side from by throttle body. I can rent fuel gauge tomorrow n check that. Thanks
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Saturday, June 6th, 2015 AT 4:06 PM
Tiny
LALFAN1960
  • MEMBER
  • 37 POSTS
Checked pressure on the line in front of dist. On driver side. 54 running n drops to about 25 after shutting off. And I suppose better check filter on it to?
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Sunday, June 7th, 2015 AT 11:30 AM
Tiny
LALFAN1960
  • MEMBER
  • 37 POSTS
Filter is open. Blew thru easy
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Sunday, June 7th, 2015 AT 12:00 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Fuel pressure should be 60 psi minimum as I gave spec in first answer. Replac ethe that and the fuel filter as well.
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Sunday, June 7th, 2015 AT 3:26 PM
Tiny
LALFAN1960
  • MEMBER
  • 37 POSTS
Yes had ur specs. Just wanting to make sure there is nothing else to cause the pressure to be low other than pump alone. Thanks
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Sunday, June 7th, 2015 AT 4:24 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It cold be the regulator but you have to have suffiecient pressure to fuel rail first which you don't
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Monday, June 8th, 2015 AT 6:51 AM
Tiny
LALFAN1960
  • MEMBER
  • 37 POSTS
Got new pump in. 53 psi running n drop to 49 off. Before drop to 20. Not getting the 60-66. Will that make that much difference in running? Thanks
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Sunday, June 14th, 2015 AT 2:40 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Read the last reply I sent. If you don't have the minimum of 60 psi it causes all the problems you are having.
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Sunday, June 14th, 2015 AT 3:35 PM
Tiny
LALFAN1960
  • MEMBER
  • 37 POSTS
Yes sir. Had somebody else say it wouldn't so I don't no. So why would I not get that much pressure now. Put in a Delphi pump
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Sunday, June 14th, 2015 AT 4:10 PM
Tiny
LALFAN1960
  • MEMBER
  • 37 POSTS
No response. Guess it wasn't the pump n now no response? Thanks. That's worth my money
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Sunday, June 14th, 2015 AT 7:55 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
I f you put in a new pump and still not getting the pressure it can be a few things what is the pressure now? It can also be the fuel pressure regulator. It can also be a plugged fuel line filter in the tank which I am assuming has been replaced with fuel pump. And I never got your last reply.
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Monday, June 15th, 2015 AT 6:44 AM
Tiny
LALFAN1960
  • MEMBER
  • 37 POSTS
Running was 53 and off went to 49. It had it all replaced about a year ago. Tank was clean. Filters was clean. I blew thru line filter. Easy. Before pressure dropped to 20. Running never changed. Runs the same as it did before I changed it
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Monday, June 15th, 2015 AT 10:21 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
When did you replace the pump last? And is it the correct pump?
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Monday, June 15th, 2015 AT 12:00 PM
Tiny
LALFAN1960
  • MEMBER
  • 37 POSTS
Put new pump in yesterday and it is the one auto zone had for it. Message yesterday said I put in new pump n readings for it
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Monday, June 15th, 2015 AT 3:42 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Then check your fuel pressure regulator that may be bad as well. What kind of pump is it as a lot of them aren't any good. Normally Delco or airtex. Keep away from carter lot of guys aren't having very good luck with that.
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Monday, June 15th, 2015 AT 3:55 PM
Tiny
LALFAN1960
  • MEMBER
  • 37 POSTS
It was a Delphi. Read online Carter was suppose to be good. Heard spectra was good to
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Monday, June 15th, 2015 AT 4:53 PM
Tiny
LALFAN1960
  • MEMBER
  • 37 POSTS
So what is the process for checking the regulator beings its built in. No info unless u give it to me. I'm not a shop. Went to school in 79-80. Old school n didn't stay with it. So have no access to info. Interweb only
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Monday, June 15th, 2015 AT 7:40 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
I already sent apic of the regulator if you cant see it above it is usually on the pass enger side of intake. If you cant' see it now then it is under the top piece of intake. See pics. If your line at tank looks like one in pic this may be your problem as well. Also if pump was not installed correctly will be a problem. Other than that I can offer no further assistance or replies.
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Tuesday, June 16th, 2015 AT 6:15 AM
Tiny
LALFAN1960
  • MEMBER
  • 37 POSTS
I have screw together lines on the tank n sure regulator is underneath. Guess I will get something figured out
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Tuesday, June 16th, 2015 AT 6:23 AM

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