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Username Post: 1994 Full Size Blazer cold start issues        (Topic#364056)
Whistling Buford 
Newbie
Posts: 32

Age: 62
Loc: Philadelphia Area
Reg: 10-16-17
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.



 
Chevytech 
Subject Matter Expert - Senior Member
Posts: 3922
Chevytech
Loc: Twin Cities, Minnesota, U...
Reg: 04-25-04
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.


 
tcndeb 
Senior Member
Posts: 431

Loc: Texas
Reg: 04-18-04
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.

'92 Full Size Blazer


 
rockfangd 
"8th Year" Gold Supporting Member
Posts: 3090
rockfangd
Age: 34
Loc: Utica ny
Reg: 04-13-10
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


 
Whistling Buford 
Newbie
Posts: 32

Age: 62
Loc: Philadelphia Area
Reg: 10-16-17
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.



 
CowboyTrukr 
"10th Year" Silver Supporting Member
Posts: 4568
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
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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