1994 Silverado 5.7L TBI Engine Missin...

Since: Aug 11

New Delhi, India

#82 Aug 18, 2011
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?
go for the new one dude...

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tranny trainer

Dallas, TX

#83 Aug 22, 2011
Cats are bad.
Big E

Cedar Creek, TX

#84 Aug 26, 2011
Problems at idle on my 1989 k5 5.7 tbi . having the idle go up and down, not a steady idle. I have just done replacing the iac , tps, and the map sensor still having the same problems. Can't some tell me if I am replacing wrong parts?
Dan Doggett

Buffalo, NY

#85 Aug 30, 2011
adam wrote:
i have a 1994 chevy 1500 5.7l tbi i recently had a coolant issue changed radiator hoses and water pump finally got water to stop now im having problems with the truck running rough when u start it it runs fun but if u8 hit the gas quick and let off it almost stalls out. also when u drive it till it gets hott it shuts off at intersections and to get it to start u have to put foot on gas peddle and crank it til it starts when it fires it almost smells like its loading up any sugestions
I have the same symptoms. Mine also surges badly when cold after you let off, the will catch backup. All symptoms are intermittent, seems worse on warmer days. I replaced TP sensor, New Distributor, wires and plugs, coil, and still does it. Mine started before the WP went out. PCV is ok too.
chuck

Grass Valley, CA

#86 Aug 31, 2011
Big E wrote:
Problems at idle on my 1989 k5 5.7 tbi . having the idle go up and down, not a steady idle. I have just done replacing the iac , tps, and the map sensor still having the same problems. Can't some tell me if I am replacing wrong parts?
Have you put a vacuum gauge on it to verify no leaks?
chuck

Grass Valley, CA

#87 Aug 31, 2011
Dan Doggett wrote:
<quoted text>
I have the same symptoms. Mine also surges badly when cold after you let off, the will catch backup. All symptoms are intermittent, seems worse on warmer days. I replaced TP sensor, New Distributor, wires and plugs, coil, and still does it. Mine started before the WP went out. PCV is ok too.
You need to verify EGR valve and solenoid are operating properly. To check the solenoid, place a vacuum gauge between solenoid and EGR valve using a T connection. Apply vacuum to TBI side of solenoid if you get vacuum on the gauge then your solenoid is leaking. Also you need to check the bled valve is opening after ECM commands EG. Put the gauge on the bleed port and warm the engine. It has to be in closed loop before ECM will open EGR valve. Rev engine and watch for deflection if there is no deflection and the EGR valve opened, then the solenoid is not releasing the vacuum and the EGR valve is staying open, not good. R/R

Verifying the EGR valve is working properly is a little more difficult. One thing you can do is temporarily plug the vacuum line between the egr and solenoid. If it runs better your on the right track.
corey

Charles Town, WV

#88 Sep 1, 2011
I have a 1994 chevy truck runs extremely good when cold but when truck warms up it has a slight miss just barely touch the gas and it surges. When I hold it at a steady pace it surges also. I have replaced iac fuel pump distribtor pick up mod. Egr valve throttle body complete tune up checked all voltage appears fine new gas tank sending unit both colant temp sensors throttle position sensor new 02 sensors nothing has seemed to help. It has me completely stumped any ideas
pepe

Aurora, Canada

#89 Sep 1, 2011
I have 1998 gmc pick-up 1500 when on load I lose power had a tune up done I'm thinking ignition coil
Chuck

Grass Valley, CA

#90 Sep 1, 2011
corey wrote:
I have a 1994 chevy truck runs extremely good when cold but when truck warms up it has a slight miss just barely touch the gas and it surges. When I hold it at a steady pace it surges also. I have replaced iac fuel pump distribtor pick up mod. Egr valve throttle body complete tune up checked all voltage appears fine new gas tank sending unit both colant temp sensors throttle position sensor new 02 sensors nothing has seemed to help. It has me completely stumped any ideas
My truck exactly. I haven't put all the new parts in but I don't think it will help. I think this is a generic problem with vehicles with alot of miles, wear and tear etc. Of course I could be way off. What I have done is not quite legal and I know it won't pass smog but it runs great. I disconnected the egr valve and plugged the vacuum hose and I advanced the base timing by 4 degrees. Performance is good and no longer have that sluggish miss. I guess a stretched timing chain could cause those problems. I'll check that out before my next smog while I'm putting back to OEM specs.
corey

Charles Town, WV

#91 Sep 1, 2011
Chuck wrote:
<quoted text>
My truck exactly. I haven't put all the new parts in but I don't think it will help. I think this is a generic problem with vehicles with alot of miles, wear and tear etc. Of course I could be way off. What I have done is not quite legal and I know it won't pass smog but it runs great. I disconnected the egr valve and plugged the vacuum hose and I advanced the base timing by 4 degrees. Performance is good and no longer have that sluggish miss. I guess a stretched timing chain could cause those problems. I'll check that out before my next smog while I'm putting back to OEM specs.
.

I just blocked the egr valve off completely put a piece of tin under it. I already advanced timing last week seems to run a lil better I also have encountered poor gas milage went from 18 to 10 mpgs my next step is replacing the computer cause my truck went from running lean to running rich
corey

Charles Town, WV

#92 Sep 2, 2011
pepe wrote:
I have 1998 gmc pick-up 1500 when on load I lose power had a tune up done I'm thinking ignition coil
. Do you also loose power going up hills without a load on th truck
Chuck

Grass Valley, CA

#93 Sep 3, 2011
corey wrote:
<quoted text>.
I just blocked the egr valve off completely put a piece of tin under it. I already advanced timing last week seems to run a lil better I also have encountered poor gas milage went from 18 to 10 mpgs my next step is replacing the computer cause my truck went from running lean to running rich
I have had a scanner hooked up while driving and noticed mine runs a little rich and some of the parameters don't jive with traditional logic. I have actually considered getting the programming on the computer verified. I know my computer is working, otherwise the truck wouldn't run. I suppose the programming my have degraded and the program needs to by reflashed. I'm not sure at this point. I wish I new a reputable shop where I could take it and have that checked.
corey

Charles Town, WV

#94 Sep 3, 2011
Chuck wrote:
<quoted text>
I have had a scanner hooked up while driving and noticed mine runs a little rich and some of the parameters don't jive with traditional logic. I have actually considered getting the programming on the computer verified. I know my computer is working, otherwise the truck wouldn't run. I suppose the programming my have degraded and the program needs to by reflashed. I'm not sure at this point. I wish I new a reputable shop where I could take it and have that checked.
.
I just put a new computer in my truck and it runs like brand new again its located behind the glove box on the right hand side
justin

Jefferson, GA

#95 Sep 5, 2011
I got a 92 z71. It runs and idles fine. But when I drive off its fine when i get on the gas to go up the hill it cuts in and out. So I took the egr valve off and cleaned it. Worked fine afterward kinda idled high. today started up doing same stuff. bogging down trying to go up a hill. i can disconnect the egr vacuum line on the valve and it doesn't make no difference.
Chuck

Grass Valley, CA

#96 Sep 6, 2011
corey wrote:
<quoted text>.
I just put a new computer in my truck and it runs like brand new again its located behind the glove box on the right hand side
Good news and feels good to get it running right? How much did that computer set you back? I actually have made improvement on mine too. So far this is what's failed. The pick up coil harness had cracked insulation causing it to intermittantly short to ground. When I pulled the distributor I checked rotation on the lathe and found shaft to not turn true relative to housing. I got a distributor at picknpull with a good pick up coil and a good ignition module, imagine that. The ignition coil also had a weak spark and I replaced it also. Found heat imbrittled wiring within engine harness and replaced what I found with new conductors. The EGR valve leaked when closed so I replaced it also. I bought a new EGR valve from dealer,$175.00. The distributor cost $38.00 with all the accessories. The ignition coil was a good coil I had purchased during previous outage. Today the truck runs quite well but with all these used parts I suspect it won't last long. That's OK because I've learned alot about how to troubleshoot and nail down the problem. I was starting to think a new truck would be a good idea but I'm waiting for an electric truck that can go 300 miles on a charge and pull the boat. I hope I live long enough to see it. A few years back I did a barter with a neighbor that needed alot of wirk done to their home for purposes of selling it an d moving to Minneapolis. They had a porsche replica on a volkswagon frame. Nicely put together with alot of detail. It was purchased originally in 1994 from a company in LA, Green Motor Works. It's electric, uses 10 lead acid batteries. Got 35 miles on a charge driving around town. I took it out on the highway and got it up to 65mph. Batteries were dead within 15 miles. Pulled into a Mercedes dealership and asked if I could use an electrical outlet to charge my car, they laughed.
I sold the car but I really liked the idea it just wasn't practical for me.
Dave B

Phoenix, AZ

#97 Sep 8, 2011
I have a 1996 2500 Silverado with a 5.7 Liter engine. I have a full tune up done on it and it still spits and sputters when I take off. At idle, it runs just as smooth as anything. It is just when I put a load on the engine that it does this. My mechanic thinks it is the injector. Any ides?
Chuck

Grass Valley, CA

#98 Sep 8, 2011
Dave B wrote:
I have a 1996 2500 Silverado with a 5.7 Liter engine. I have a full tune up done on it and it still spits and sputters when I take off. At idle, it runs just as smooth as anything. It is just when I put a load on the engine that it does this. My mechanic thinks it is the injector. Any ides?
Man, I feel for ya, mine started it's same old crap agian. I've decided to donate to good will. Looking at Toyato and Ford today.
Heard the Tundra is good truck. Chevy can bite me.
Dave B

Phoenix, AZ

#99 Sep 8, 2011
Chuck wrote:
<quoted text>
Man, I feel for ya, mine started it's same old crap agian. I've decided to donate to good will. Looking at Toyato and Ford today.
Heard the Tundra is good truck. Chevy can bite me.
A Toyota or a Ford will not pull my travel trailer, so that is out.
Matt

Abbotsford, Canada

#100 Sep 10, 2011
I have a 1994 chevy 5.7L all of a sudden now it starts surging, and idling funny in line ups at like tim hortens , and wants to jump forward it seems, I found tonight near egr vavle /egr valve solenoid, if I wiggle the line going into it, it seems to freak it right out, and starts idleing all funny up and down like a fuel pump is going , but that was just replaced, by me, and the egr valve soleniod was replaced too along with a brand new egr valve, and my truck also hesitates in morning when cold, you can hear it under hood by TBI unit , POPPING AND FARTING SPUTTERING then if you apply to much gas it seems to shut er right down untill you drive it around for a while... starting to loose my marbles with sensors, new map sensor , truck just back fired other night and truck shut off and the ignition module just packed it in, no spark, so replaced that , new dist. brand new temp sensor to comp brand new guage sensoor , brand new tps brand new idle air control, ready to drive the truck off a cliff.. oh and refreshed motor it had 350,000KM on it ,.. what do I try now?
kyle

United States

#101 Sep 26, 2011
Iv got a chevy silverado. 1995 4x4 it runs perfect except when idling. its really annoying!! Everytime I slow down to a stop light it will die. What could be the problem?

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