1994 Silverado 5.7L TBI Engine Missin...

1994 Silverado 5.7L TBI Engine Missing/Surging/Sputtering

First Prev
of 46
Next Last
OleBones

Chesterfield, MO

#1 Jul 17, 2008
My nephew's '94 5.7L(350C.I) TBI has about 170,000 miles on it and has been a really good truck since he bought it new. He has always changed the oil and filters at the correct intervals. When he is taking off, the engine seems to miss/surge/sputter until he gets to about 55 MPH. If he tries to burn rubber (which this truck will do), it runs just fine. The transmission shifts fine even though he has never had the recommended 100K servicing performed. We have changed plugs, wires, and fuel filters. I am thinking it is a Throttle Position Sensor going flaky but don't know where to find the TPS on this Throttle Body Injection. Once good cruising speed is reached, the truck runs as smooth as it should. Does anybody have any ideas? All help would be greatly appreciated.

Judged:

273

143

Reply »
Report Abuse Judge it!
nickademous

Jackson, MS

#2 Jan 6, 2009
i just had the same problem on my 93 chevy truck. the thermostat sensor and plug was melted. when this happens the computer thinks the engine is cold and it will dump more fuel in it so at low rpms the miss in the engine will happen but at high rpms the fuel is able to be burned. all you have to do is unplug it and look at the prongs you will be able to tell right away if this is the problem by looking at it. if it is melted replace the sensor and plug. remember the plug has to be replaced as well.

Judged:

77

45

7

Reply »
Report Abuse Judge it!
Mike

San Antonio, TX

#3 May 29, 2009
I also have a 94 with a 5.7 l and ran into the very same problem and it was fixed by changing the idle air control sensor located on the left side of the throttle body. It has a square plug in.Before i changed that i changed the tps and it did help but did not completly stop it. But after i changed the iac it went away. I also recomend buying a haynes repair manual as it takes out much of the guess work
Doug

Calgary, Canada

#4 Jun 29, 2009
Hi I have a 94 GMC Silverado with a 5.7 Litre in it. I was driving it last week and when I went up a hill I lost power. I pulled over and it was surging even at idle, my dreaded check engine light was on. I have a code reader and when I got it home found a 44 o2 sensor. I have since replaced the sensor and changed a fuel filter for good measure. Started it up and it ran at idle but when I put it in gear it dies and is surging again. I took my air cleaner and clearance ring off the throttle body and both injectors are spraying evenly even when it dies out. Now the o2 sensor code is back, I checked it over and it only has one o2 sensor in it. Any help would be appreciated
Randy Ritchie

Anderson, SC

#5 Aug 15, 2009
Did you find out what was wrong? I have a 94 silverado doing the same thing.Thanks Randy
Musicman

Calgary, Canada

#6 Aug 15, 2009
Randy Ritchie wrote:
Did you find out what was wrong? I have a 94 silverado doing the same thing.Thanks Randy
Randy It wound up to be my fuel pump, that explained the lack of power when I stepped on it and a simple test was disconnecting the fuel line and testing pressure. If it's below the 12 - 15 psi it's time for a new one. As for the surging my Air Idle Control valve on the throttle body was toast. The simple way to test that is to remove it, get a 9 volt battery and tape two leads on it. Once taped put the wires into one set of the four holes and then the other one. If the little plunger goes in and out it's okay, but if it doesn't move it toast.

If it's the pump save yourself the money and remove the box, once lifted and pulled back about 2 feet you can see the pump and access it easily.The pump alone is $94.00 and easy to change.
stevens99

San Diego, CA

#7 Sep 8, 2009
i have a 95 chevy k1500 and it sputters even when it is idleing i have changed the fuel filter and that helped some.. chould it be my fuel pump and sending unit??
spikestir

North Olmsted, OH

#8 Dec 4, 2009
I also have a 1994 chevy silverado 5.7 litter that as about 160,000 miles on it. It is also sputtering. I found gas in oil. Was told that one of the spark plugs were bad. By the way the truck had a complete tune up done on it before all this happened. They did not change the fuel filter because it had a new one on it you can only get a Napa. First we changed the fuel filter. It was clogged. Truck run great for a week. They thought they found the problem a bad plug that may have been sometimes working and sometimes not. Back to the sputtering. If you run over 55 no sputter. Also truck temp never goes over 250.
chuck

West Haven, CT

#9 Dec 13, 2009
had the same problem with my 94 ended up being the pick up in tht distribotor
spikestir

Columbia City, IN

#10 Dec 14, 2009
Hey Found the problem bad spark plug wire!!! It was burnt.
johnsoe

Sterling Heights, MI

#11 Jan 4, 2010
Recently had issues with my 94 Silverado running rough, and stalling at stop lights.
Changed out the Spark plugs and wires, with no change.
Looking at this forum and other, found that it could be the Idle Air Control Valve.
Spent $24 at local Murray's part store for new IAC. And it cleared it all up.
Cheap fix.
Josh

United States

#12 Jan 9, 2010
Hey i have a 1994 chevy Z71 with the 5.7 TBI in it. It idles fine and runs fine until im at a stop and really mash it to the floor it cuts out and kills the engine unless i let off and it goes back to idle. If i half or 3/4 press the throttle it raps up fine just only when i mash it all the way down it cuts it out. Any one please help
justin

Casper, WY

#14 Feb 27, 2010
I have a 2002 3/4 8.1 when i am just driving normal it runs fine and start up its fine but when i get on it it reaches high RPMs and starts to cut out iv changed fuel filter spark plugs and wires. does anyone know what the heck is going on please let me know
poppe

Lincoln, NE

#15 Apr 22, 2010
i have a 95 chevy with the 5.7 liter and i am having the same problem with the sputtering and the rough idle i have changed the ignition coil and the ignition control module along with the distributor cap and rotor but still no change the biggest problem i have is i can service the truck and in less tham a 1000 miles i have lost almost all of my oil i cant find a leak their is no oil on the ground when parked so i think it is burning the oil. is my problem the piston rings needing replaced or what any help would be great

Judged:

41

17

1

Reply »
Report Abuse Judge it!
justin

United States

#16 Apr 30, 2010
ya i would change those if u cant find any oil then for sure buring it and my sputtering was stupidly simple i took it in and he said he changed the cylinders coil packs that were miss firinf and the plugs then he sai he found a nasty ground wire so he cleaned it off and sure enough it fixed the problem i dont know what ground wire or anyting but that was the problem it runs like new agin
Martin

Chandler, AZ

#17 May 25, 2010
My 1994 Z71 has sputtering in the morning. I warm up the engine about 10-12m before driving it but, when I putted in drives and applied gas the engine sputters and dies, I restarted it idles at 400RMP putted in drives applied gas moving but sputtering and dies it does this four to five time. I only drive 1.5 miles to work. It will die on me again as soon as I enter my work’s parking lot. In the after noon when I drive home it’s fine it starts up no problems I drive to store, drop off movies, and pick up dinner shut off and restart engine at every location with no problem just in the morning, any suggestions?
Already replaced Idle Air Control Valve will try the gas filter next.
Martin

Chandler, AZ

#18 Jun 15, 2010
Problem fixed by replacing the fuel pump, engine running great and all is good in Chandler AZ.
Learoy

Gonzales, LA

#19 Jun 21, 2010
I've got a 1994 Chevrolet Silverado K1500 Z-71 with the 5.7L 350 TBI. I bought this thing with 209000 miles on it and halfway home the temperature gauge went to nothing. I went home and did a full tune up and oil change. I also change a temperature sensor located near the Thermostat along with the thermostat itself. The guy that I bought it from was getting plenty of power and around 13 to 15 mpg. Now, after the maintenance I performed, it idles rough, gets only 10 mpg, loses power on a incline, and runs like gabage at 1200 to 2000 rpms. The temperature gauge still doesn't work. Anybody got any ideas?
Bryan

Phoenix, AZ

#20 Jul 10, 2010
Put all the old parts and oil back in and dont ever work on a vehicle again, lol
Learoy wrote:
I've got a 1994 Chevrolet Silverado K1500 Z-71 with the 5.7L 350 TBI. I bought this thing with 209000 miles on it and halfway home the temperature gauge went to nothing. I went home and did a full tune up and oil change. I also change a temperature sensor located near the Thermostat along with the thermostat itself. The guy that I bought it from was getting plenty of power and around 13 to 15 mpg. Now, after the maintenance I performed, it idles rough, gets only 10 mpg, loses power on a incline, and runs like gabage at 1200 to 2000 rpms. The temperature gauge still doesn't work. Anybody got any ideas?
Steve

Chicago, IL

#21 Jul 11, 2010
The temp sensor for the guage is located in head on drivers side.

Tell me when this thread is updated:

Subscribe Now Add to my Tracker
First Prev
of 46
Next Last

Add your comments below

Characters left: 4000

Please note by submitting this form you acknowledge that you have read the Terms of Service and the comment you are posting is in compliance with such terms. Be polite. Inappropriate posts may be removed by the moderator. Send us your feedback.

Chevrolet Pickup Truck Discussions

Title Updated Last By Comments
Motor wont start and run after truck warms up. Sep 14 Michaeladamsjr 1
94 z71 problems (Mar '17) Aug '17 Kevin 2
1996 chevy c1500 transmission Aug '17 JCB 1
95 chevy 2500. Backfire, wont gain speed, now w... Aug '17 DontRaceBikes 1
94 chevy k1500 problems Jul '17 rebelboy427 1
My 1994 chevy truck 1500 5.7 missing after tune... May '17 Bourbon74 1
Suburban halfe to hit throttle. Hard to start 5... May '17 Moneyman 1
More from around the web