Please Help Im Losing My Mind

[therebel01]

i am getting out of the army and my luck everything goes bad in my truck 3 days before i have to ship it, she idles perfect when you rev her she acts like 2500 to 3000 is a rev limiter, she moves good as soon as you let off the brake but as soon as you press the petal she boggs down hard, and i mean hard and has no power what so ever, i cant figure it out, replaced distributor, coil, wires and plugs, replaced the Throttle positioning sensor, egr valve, took the valve covers off and the rockers and valve are working good, and she has great fuel presure. all the spark plugs are new and look good with just the normal burn marks. i have dumped 1000 into trouble shooting this and now im just short of wanting to blow her up.

 

shes a 94 silverado, k1500 5.7 4x4, i cant figure it out anymore but i need to the army is dropping her off 650 miles short of my house and i have to drive it that far and that will take a week at 20mph lol please help

[nick44]

I cannot tell you how to fix your truck but welcome to the site. I am sure somone will have an answer for you. And congrats on the the upcomming ETS!

[bill190]

It sounds like what you don't have is time!

 

Without testing various things properly along with a factory fuel and emissions service manual (get these from a dealer), you would just be guessing as to the problem.

 

If I were in your shoes, I would either take it to a GM dealer and have them fix it, or find some way to tow it home. You can get a vehicle trailer from rental places. Maybe you could get another truck or rent one and tow it home? If you do this, DON'T get in a situation where you need to back up! These things are impossible to back up!

 

As to fixing it with a fuel and emissions service manual yourself, this would take time as well. There is a lot of learning to do if you are not familiar with using a multimeter. And then special tools are sometimes needed for things like measuring the fuel pressure, etc. And it takes time to go buy these things or read up on how to do this or that.

[TexasAl]

Go to a muffler shop, and have them check the catalytic converter. This will be your best bet, especially if you are not getting any dummy light to come on. Good luck, and let us know how it goes.

[bigbengalbubba]

Go to a muffler shop, and have them check the catalytic converter. This will be your best bet, especially if you are not getting any dummy light to come on. Good luck, and let us know how it goes.

 

 

I second the Catalytic converter being the likely culprit.

[Draenor]

Go to a muffler shop, and have them check the catalytic converter. This will be your best bet, especially if you are not getting any dummy light to come on. Good luck, and let us know how it goes.

 

 

I second the Catalytic converter being the likely culprit.

 

I guess i will turd...i mean 3rd the cat being the problem.

[therebel01]

ive cut the cats out, she has a mild edelbrock cam, intake, msd probillet distributor, jet chip, hooker super comp headers true duals flowmaster. someone told me its my computer but i love my truck but i almost want to just go blow it up i cant take this, its my luck that right before i have to ship it it does this

[bill190]

ive cut the cats out, she has a mild edelbrock cam, intake, msd probillet distributor, jet chip, hooker super comp headers true duals flowmaster...

 

Well there goes the taking it to a GM dealer for service option.

 

3rd party mechanic?

[grampadirt]

A shot in the dark but maybe it's your MAP sensor.....here's a pic & info

[therebel01]

they didnt have a map sensor in the 94s i appreciate it though man

[bill190]

Well don't worry, there are always options to problems such as this.

 

Is there anywhere you could leave it for awhile where the Army is going to drop it?

 

Maybe at a base or at someone's home in the area?

 

Could you ask around and someone might find a place where you could park the vehicle until you could make other arrangements?

 

If all else fails, walk into the nearest VETS club and yell "Help! I'm stranded!". It is my experience that people are good natured and will help a fellow out when needed.

[TexasAl]

No dummy lights come on? If they do, then do the following:

 

TECH TIPS

Reading Codes/OBD1-Pre 1996 Models

 

1. Locate ADL port below dash.

 

2. Insert paperclip or similar wire. (see photo)

 

3. KOEO (Key On Engine Off) watch SES light.

 

4. SES (check engine) light will blink out codes. It will flash, then short pause, then flash again, then long pause between codes. Example: flash, (pause), flash, flash (long pause) is code12 for no RPM. This code is always present.

 

Example 2: Flash, flash, flash (pause) flash, flash, flash, (long pause) = code 33. The computer will continue to scroll through the codes and generally begins and ends with 3 code 12's, with important codes being shown in between.

Read Codes

Error Codes

 

NOTE: All DTC(S) with the * sign are automatic transmission (4L80E) related

 

DTC 13 - Engine Shutoff Solenoid Circuit Fault

DTC 14 - Engine Coolant Temperature (ECT) Sensor Circuit Low (High Temp

Indicated)

DTC 15 - Engine Coolant Temperature (ECT) Sensor Circuit High (Low Temp

Indicated)

DTC 16 - Vehicle Speed Sensor Buffer Fault

DTC 17 - High Resolution Circuit Fault

DTC 18 - Pump Cam Reference Pulse Error

DTC 19 - Crankshaft Position Reference Error

DTC 21 - Accelerator Pedal Position 1 Circuit High

DTC 22 - Accelerator Pedal Position 1 Circuit Low

DTC 23 - Accelerator Pedal Position 1 Circuit Range Fault

*DTC 24 - Vehicle Speed Sensor Circuit Low (Output Speed Signal)

DTC 25 - Accelerator Pedal Position 2 Circuit High

DTC 26 - Accelerator Pedal Position 2 Circuit Low

DTC 27 - Accelerator Pedal Position 2 Circuit Range Fault

*DTC 28 - Transmission Range Pressure Switch Circuit

DTC 29 - Glow Plug Relay Fault

DTC 31 - EGR Control Pressure/Baro Sensor Circuit Low (High Vacuum)

DTC 32 - EGR Circuit Error

DTC 33 - EGR Control Pressure/Baro Sensor Circuit High

DTC 34 - Injection Timing Stepper Motor Fault

DTC 35 - Injection Pulse Width Error (Response Time Short)

DTC 36 - Injection Pulse Width Error (Response Time Long)

*DTC 37 - TCC Brake Switch Stuck "ON"

*DTC 38 - TCC Brake Switch Stuck "OFF"

*DTC 39 - TCC Stuck "OFF"

DTC 41 - Brake Switch Circuit Fault

DTC 42 - Fuel Temperature Circuit Low (High Temp Indicated)

DTC 43 - Fuel Temperature Circuit High (Low Temp Indicated)

DTC 44 - EGR Pulse Width Error

DTC 45 - EGR Vent Error

DTC 46 - Malfunction Indicator Lamp (MIL) Circuit Fault

DTC 47 - Intake Air Temperature Sensor Circuit Low (High Temp Indicated)

DTC 48 - Intake Air Temperature Sensor Circuit High (Low Temp Indicated)

DTC 49 - Service Throttle Soon Lamp Circuit Fault

DTC 51 - PROM Error

*DTC 52 - System Voltage High Long

*DTC 53 - System Voltage High

DTC 54 PCM fuel circuit error

DTC 56 - Injection Pump Calibration Resistor Error

*DTC 57 - PCM 5 Volt Shorted

*DTC 58 - Transmission Fluid Temp Circuit Low

*DTC 59 - Transmission Fluid Temp Circuit High

DTC 61 - Turbo Boost Sensor Circuit High

DTC 62 - Turbo Boost Sensor Circuit Low

DTC 63 - Accelerator Pedal Position 3 Circuit High

DTC 64 - Accelerator Pedal Position 3 Circuit Low

DTC 65 - Accelerator Pedal Position 3 Circuit Range Fault

*DTC 68 - Transmission Component Slipping

*DTC 69 - TCC Stuck "ON"

DTC 71 - Set/Coast Switch Fault (Cruise Control)

*DTC 72 - Vehicle Speed Sensor Circuit Loss (Output Speed Signal)

*DTC 73 - Pressure Control Solenoid Circuit (Current Error)

*DTC 74 - Transmission Input Speed (TIS) Sensor Circuit

*DTC 75 - System Voltage Low

DTC 76 - Resume/Accel Switch Fault (Cruise Control)

DTC 78 - Turbo Wastegate Solenoid Fault

*DTC 79 - Transmission Fluid Over-temperature

*DTC 81 - 2-3 Shift Solenoid Circuit Fault

*DTC 82 - 1-2 Shift Solenoid Circuit Fault

*DTC 83 - TCC PWM Solenoid Circuit Fault

*DTC 84 - Accelerator Pedal Position Circuit Fault

*DTC 85 - Undefined Ratio Error

*DTC 86 - Low Ratio Error

*DTC 87 - High Ratio Error

DTC 88 - TDC (Top Dead Center) Offset Error

DTC 91 - #1 Cylinder Balance Fault

DTC 92 - #2 Cylinder Balance Fault

DTC 93 - #3 Cylinder Balance Fault

DTC 94 - #4 Cylinder Balance Fault

DTC 95 - #5 Cylinder Balance Fault

DTC 96 - #6 Cylinder Balance Fault

DTC 97 - #7 Cylinder Balance Fault

DTC 98 - #8 Cylinder Balance Fault

DTC 99 - Accelerator Pedal Position 2 (5 Volt Reference Fault)

[TexasAl]

If you do this, and you still don't have any codes, take that TPS sensor off, and get it checked out at a local parts store. Pretty much, the only parts of the truck that would cause that much havoc on a pre OBDII trucks are going to be a the cad. conv, TPS, IAC (Idle air control), EGR (not sure if those truck came with one) and ECM. Map sensor would have to go into safe mode of it went bad. Even if you had a vacuum leak, the truck would at least run.

-Start with getting the codes.

-Remove the Jet chip

-Get the TPS checked out at Autozone or similar auto parts store (they check the resistance)

-Then, clean the IAC valve and EGR valve with carb. cleaner.

-If all else fails, I would suspect it is a computer related problem.

 

Let us know how it goes.

 

-Al

[therebel01]

If you do this, and you still don't have any codes, take that TPS sensor off, and get it checked out at a local parts store. Pretty much, the only parts of the truck that would cause that much havoc on a pre OBDII trucks are going to be a the cad. conv, TPS, IAC (Idle air control), EGR (not sure if those truck came with one) and ECM. Map sensor would have to go into safe mode of it went bad. Even if you had a vacuum leak, the truck would at least run.

-Start with getting the codes.

-Remove the Jet chip

-Get the TPS checked out at Autozone or similar auto parts store (they check the resistance)

-Then, clean the IAC valve and EGR valve with carb. cleaner.

-If all else fails, I would suspect it is a computer related problem.

 

Let us know how it goes.

 

-Al

 

 

 

thanx ill do all that tomarrow mouring, i alrady put a new TPS in her and changed out the egr, i did a redneck test on the IAC but i didnt clean everything out, i didnt know you could pull codes with a paper clip we do that alot on the humvees here in the army lol, so much you can do with a simple paper clip, thanks for the help ill try that i was acctually starting to lean towards a slightly cracked head which of course i dont have time to change but it was barable a couple weeks ago and today she will barly idle when 3 days ago she idled fine so whatever it is its getting worse and fast

[therebel01]

i pull DTC 83, i believe i have a stuck valve or maybe a crack in the head, but i believe DTC 83 could mean a stuck valve, its gonna be tough but tomarrow imma try to drive her to the port and hope they dont notice lol