i a 93 k5 blazer 5.7tbi in cold weather it will not start, if i hook jumper cables up it will start but runs very rough until it warms up, then it will not idle on its own and dies at every stop.


Asked by Nov 15, 2013 at 05:56 PM about the 1993 Chevrolet Blazer Silverado 4WD

Question type: Maintenance & Repair

i a 93 k5 blazer 5.7tbi in cold weather it will not start, if i hook jumper cables up it will start but runs very rough until it warms up, then it will not idle on its own and dies at every stop. if the weather is above 40-50f the truck starts fine but will still die at idle or a stop light.

fuel pump
cap rotor
pick up coil
Ignition control module
idle air control valve
egr solenoid

I don't know what else could be replaced to fix it

also when its cold (the engine) it sputters back fires and just runs like crap

11 Answers


also has new plugs and wires

1 of 1 people found this helpful.

Any black smoke out the tailpipe? Sounds like an overly rich air/fuel mixture. Check your new plugs for gasoline fouling. Could be bad fuel injectors (leaking). Is it backfiring out the throttle body or tail pipe? Did you check or replace the EGR valve. That may cause these symptoms as well. HTH. -Jim

1 of 1 people found this helpful.

no smoke out the tail pipe and seems to be back firing out the throttle body, egr seems ok, but then again the motor will run fine without the egr

1 of 1 people found this helpful.

im thinking of putting in another new fuel pump, screen, fuel filter and ill try replacing the throttle body injectors too they are cheap


If the EGR valve is stuck partly open it won't idle. It also won't usually trigger the check engine light on an OBD I (pre '96 model). Try tapping on the EGR valve with the handle end of a large screwdriver. If that straightens it out the EGR valve is sticking. If not, then yes, I'd suggest replacing the fuel injectors. Popping back out the throttle body usually means a lean air/fuel mixture. Double check the spark plug wires. Make sure they're going to the correct cylinders. Check for vacuum leaks as well. HTH. -Jim

1 of 1 people found this helpful.

if anyone else had these symptoms with a 5.7 please advise what you did to fix it!! thanks :)


You haven't mentioned fuel pressure. Try testing the pressure. Maybe check the regulator built into the back of the throttle body, have had issues there.

Best Answer

can you replace the regulator on the tbi or is it built it


It's been awhile but I believe you can get the individual parts? Mine were usually just plugged. If you take it apart carefully you can salvage the gasket and re-assemble. Disconnecting the fuel lines are the worst part. A fuel pressure test gauge is a quick and cheap tool to check the fuel pressure. I've never bought parts for my TBI's (except for sensors) I have a few spare motors and just swap until it runs! I did try the holley TBI unit but I was not impressed. I will check quick and see what parts you can buy.


Yes you can get parts. If you like working on your own wheels the fuel gauge is handy. If not just take the reg apart the issue (if there is an issue) should be easy to see. Your local parts place should carry them. I found them on rockauto. Jegs also has a upgrade that makes the pressure adjustible.

I had the same problem and it was a bent push rod. Take the valve covers off and look it would be visible. I spent a fortune on mine and it was a 200 dollar fix.

Your Answer

Add photo

Related Questions


Looking for a Used Blazer in your area?

CarGurus has 1,173 nationwide Blazer listings starting at $1,495.


Search Chevrolet Blazer Questions

Chevrolet Blazer Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 2,010
#2 yetilikesbeer
Reputation 1,320
#3 Rowefast
Reputation 1,030
View All

Related Models For Sale

Used Chevrolet S-10
8 Great Deals out of 1,314 listings starting at $1,999
Used GMC Jimmy
287 listings
Used Ford Bronco
191 listings
Used Ford Explorer
903 Great Deals out of 65,287 listings starting at $799
Used Jeep Grand Cherokee
1,064 Great Deals out of 73,686 listings starting at $1,200
Used Ford F-150
2,142 Great Deals out of 195,030 listings starting at $290
Used Chevrolet Suburban
282 Great Deals out of 19,177 listings starting at $1,995
Used Toyota 4Runner
227 Great Deals out of 19,047 listings starting at $2,195
Used Chevrolet Camaro
350 Great Deals out of 31,314 listings starting at $2,500
Used Chevrolet C/K 1500
883 listings starting at $1,950

Used Cars For Sale

2005 Chevrolet Blazer For Sale
17 listings starting at $2,499
2003 Chevrolet Blazer For Sale
108 listings starting at $1,495
2002 Chevrolet Blazer For Sale
151 listings starting at $2,740
2001 Chevrolet Blazer For Sale
168 listings starting at $2,495

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.