Truck will not stay running

Tiny
CHAS662
  • MEMBER
  • 1994 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • RWD
  • AUTOMATIC
  • 13,000 MILES
C-1500 after engine warms up starts to run rough and shuts off at low rpm. Get code 54 and have tried all the easy possible fixes.
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Saturday, May 6th, 2017 AT 7:46 PM

10 Replies

Tiny
HMAC300
  • EXPERT
See picture. Fuel pump circuit check the fusible link in picture at battery should be twelve volts both sides. Then check ground for pump may be corroded. Should be 9-11 PSI. Also, check gasket at base of TBI they like to blow out use choke cleaner to check. Can be a bad relay, oil pressure switch low oil pressure etc.
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Sunday, May 7th, 2017 AT 8:24 AM
Tiny
CHAS662
  • MEMBER
Thanks for the reply.
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Monday, May 8th, 2017 AT 1:54 PM
Tiny
CHAS662
  • MEMBER
Sorry didn't back to sooner. This started out with me changing map, plugs and wires, dis cap, rotary button. Sense then I have changed egr, fpr and fuse, oil pressure sending unit, iac, tps. At that point it stopped firing so I changed coil pack and still no fire. I don't have a meter and get confused when I try to read one so I'm out of luck there. As you can tell at I only qualify as a shade tree. I do appreciate the help and still at a stand still.
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Tuesday, May 9th, 2017 AT 6:32 AM
Tiny
HMAC300
  • EXPERT
You'll have to check resistance of pickup coil 400-1000 ohm and take ignition module in dist to auto parts they can check it
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Tuesday, May 9th, 2017 AT 6:56 AM
Tiny
CHAS662
  • MEMBER
Put on a new ignition module. Thanks again for the help. It starts now but it runs rough and sometimes back fires. Test drive and it run so bad it would hardly go. I get code 22 for the tps but I had put a new one on already. I just took it off and used the old round bushing and put new one on. Did I need to do something else?
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Wednesday, May 10th, 2017 AT 6:22 AM
Tiny
HMAC300
  • EXPERT
Did you check vacuum hoses for soft and broken/cracked and for a blown gasket under tbi unit like I said in first reply
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Wednesday, May 10th, 2017 AT 6:32 AM
Tiny
CHAS662
  • MEMBER
I do not find any bad vacuum hoses or leeks gasket seems to be ok also.
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Wednesday, May 10th, 2017 AT 7:21 AM
Tiny
HMAC300
  • EXPERT
Check your firing order you may have things mixed up there.
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Wednesday, May 10th, 2017 AT 12:09 PM
Tiny
CHAS662
  • MEMBER
With your help and expert advice we have old truck going down the road smooth. Makes me fell good. Thank You very much. Hope my small donation helps.
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Thursday, May 11th, 2017 AT 10:36 AM
Tiny
KEN
  • ADMIN
Thanks for the donation! It helps to keep the site going!

Cheers! Ken
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Saturday, May 13th, 2017 AT 5:34 PM

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