Whistling Buford
Newbie
Posts: 32
Age: 62
Loc: Philadelphia Area
Reg: 10-16-17
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01-20-21 02:23 PM - Post#2812493
OK, I have a new issue I wanted to air out here in the forum since I have had so much luck in the past with your help.
My 5.7 engine has an issue when first started in the morning cold. It sputters, pops and slight back firing when first started and continues for 30 - 60 seconds and then disappears. If I restart the truck throughout the day does not happen again. This just started happening recently.
I changed the two temp sensors as they are simple to do and inexpensive. Still doing it. Took it to a shop to see if it was throwing a code, and nothing. No check engine light either. Any thoughts on where to start ? Is this a common issue with this engine / year ? Thanks in advance.
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 Chevytech
Subject Matter Expert - Senior Member
Posts: 3922
Loc: Twin Cities, Minnesota, U...
Reg: 04-25-04
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01-20-21 05:50 PM - Post#2812506
In response to Whistling Buford
I would test the fuel pressure but it is not real easy to do on these TBI trucks.
How old it the fuel filter?
Another possibility is condensation on the inside of the distributor cap.
For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If your vehicle has been altered from stock, let us know about that too. |
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tcndeb
Senior Member
Posts: 431
Loc: Texas
Reg: 04-18-04
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01-21-21 07:26 PM - Post#2812589
In response to Whistling Buford
cracked distributor cap caused same issues on mine, minus the backfire part.
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 rockfangd
"8th Year" Gold Supporting Member
Posts: 3090
Age: 34
Loc: Utica ny
Reg: 04-13-10
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01-22-21 04:51 PM - Post#2812660
In response to tcndeb
Sure sounds like cap and possibly rotor.
I am amazed some run by how bad they looked.
As it warms up it dries out and gets better connection while firing
| Old School GM fan FOREVER |
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Whistling Buford
Newbie
Posts: 32
Age: 62
Loc: Philadelphia Area
Reg: 10-16-17
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02-22-21 06:57 AM - Post#2814860
In response to rockfangd
OK, just wanted to place closure to this one in case anyone see's the same issue. After changing th distributor cap, EGR and coil pack, the issue disappeared. So, an educated guess by the mechanic that helped me was the coil pack and he said it looked to be original (1994). But decided the cap and EGR looked to be in need of a change so I went with it
Thanks again everyone.
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CowboyTrukr
"10th Year" Silver Supporting Member
Posts: 4568
Loc: Salt Lake City
Reg: 06-20-09
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02-22-21 01:51 PM - Post#2814892
In response to Whistling Buford
Good to hear. Thanks for posting back.
Greg
‘01 Silverado 2500HD 8.1/Allison 1000 Xcab/LB
'00 Explorer XLT 4.0 SOHC V6 Auto
'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500 SOLD
"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke |
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